PoWToken | Ethereum Smart Contract - Proof of Work token | Cryptocurrency library

 by   HarryR Python Version: Current License: MIT

kandi X-RAY | PoWToken Summary

PoWToken is a Python library typically used in Blockchain, Cryptocurrency, Ethereum applications. PoWToken has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. However PoWToken build file is not available. You can download it from GitHub.
Ethereum Smart Contract - Proof of Work token
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                        summary
                        PoWToken has a low active ecosystem.
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                        It has 8 star(s) with 3 fork(s). There are 2 watchers for this library.
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                        It had no major release in the last 6 months.
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                        PoWToken has no issues reported. There are no pull requests.
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                        It has a neutral sentiment in the developer community.
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                        The latest version of PoWToken is current.
                        PoWToken Support
                          Best in #Cryptocurrency
                            Average in #Cryptocurrency
                            PoWToken Support
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                                Average in #Cryptocurrency

                                  kandi-Quality Quality

                                    summary
                                    PoWToken has 0 bugs and 0 code smells.
                                    PoWToken Quality
                                      Best in #Cryptocurrency
                                        Average in #Cryptocurrency
                                        PoWToken Quality
                                          Best in #Cryptocurrency
                                            Average in #Cryptocurrency

                                              kandi-Security Security

                                                summary
                                                PoWToken has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
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                                                PoWToken code analysis shows 0 unresolved vulnerabilities.
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                                                There are 0 security hotspots that need review.
                                                PoWToken Security
                                                  Best in #Cryptocurrency
                                                    Average in #Cryptocurrency
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                                                          kandi-License License

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                                                            PoWToken is licensed under the MIT License. This license is Permissive.
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                                                            Permissive licenses have the least restrictions, and you can use them in most projects.
                                                            PoWToken License
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                                                                        PoWToken releases are not available. You will need to build from source code and install.
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                                                                        PoWToken has no build file. You will be need to create the build yourself to build the component from source.
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                                                                        Installation instructions are not available. Examples and code snippets are available.
                                                                        summary
                                                                        It has 105 lines of code, 15 functions and 1 files.
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                                                                        It has low code complexity. Code complexity directly impacts maintainability of the code.
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                                                                                  Top functions reviewed by kandi - BETA
                                                                                  kandi has reviewed PoWToken and discovered the below as its top functions. This is intended to give you an instant insight into PoWToken implemented functionality, and help decide if they suit your requirements.
                                                                                  • Generate a new proof
                                                                                    • Calculate the difficulty of the input data
                                                                                    • Return the difficulty of the value
                                                                                  • Generate a new private key
                                                                                  Get all kandi verified functions for this library.
                                                                                  Get all kandi verified functions for this library.

                                                                                  PoWToken Key Features

                                                                                  Ethereum Smart Contract - Proof of Work token

                                                                                  PoWToken Examples and Code Snippets

                                                                                  No Code Snippets are available at this moment for PoWToken.
                                                                                  Community Discussions

                                                                                  Trending Discussions on Cryptocurrency

                                                                                  Why on printing I get value of null from API call in Loop
                                                                                  chevron right
                                                                                  How to connect Metamask to Web3J (java)
                                                                                  chevron right
                                                                                  Binance API: status: 400, error code: -1013, error message: Filter failure: PRICE_FILTER
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                                                                                  Solana: Parse Token Data
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                                                                                  Pinescript security function for colour boolean with mutable variable
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                                                                                  QUESTION

                                                                                  Why on printing I get value of null from API call in Loop
                                                                                  Asked 2022-Apr-16 at 03:06

                                                                                  COIN LIST is an array of crypto coins(["BTCUSDT",...]). I try to get the price using getPriceAction and RSI from getRSI and these two functions are working when I try to console DATA. But when I try to print the response after the completion of the loop. It prints the empty array and the length is 0 of this array. I want to store the DATA object (consisting of SYMBOL, closing price and RSI) as an element in the response array

                                                                                   import { COIN_LIST } from "./COIN_LIST.js";
                                                                                      import { getPriceAction } from "./PRICE_ACTION.js";
                                                                                      import { getRSI } from "./RSI.js";
                                                                                  
                                                                                  async function main() {
                                                                                    try {
                                                                                      let response = await [];
                                                                                      await COIN_LIST.forEach((element, i) => {
                                                                                        setTimeout(() => {
                                                                                          let data = { symbol: element };
                                                                                          getPriceAction(element, "4h").then((res) => {
                                                                                            data.closingPrice = res;
                                                                                            getRSI(res).then((res) => {
                                                                                              data.RSI = res.reverse();
                                                                                              data.closingPrice = data.closingPrice.reverse();
                                                                                              response.push(data);
                                                                                              console.log(data)
                                                                                            });
                                                                                          });
                                                                                        }, i * 1000);
                                                                                      });
                                                                                      console.log(response);
                                                                                    } catch (error) {
                                                                                      console.log(error.message);
                                                                                    }
                                                                                  }
                                                                                  main();
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2022-Apr-16 at 02:43

                                                                                  After the completion of the loop, the promises didn't get resolved yet, that's why it print an empty array. One way to achieve what you need is using await for(...), or wait for all promises to be resolved, and then print the results.

                                                                                  import { COIN_LIST } from "./COIN_LIST.js";
                                                                                  import { getPriceAction } from "./PRICE_ACTION.js";
                                                                                  import { getRSI } from "./RSI.js";
                                                                                  
                                                                                  async function main() {
                                                                                    try {
                                                                                      let response = []; //---> don't need that `await`
                                                                                      const promises = []; //---> array of promises
                                                                                      COIN_LIST.forEach((element, i) => {
                                                                                        setTimeout(() => {
                                                                                          let data = { symbol: element };
                                                                                          const promise = getPriceAction(element, "4h").then((res) => {
                                                                                            data.closingPrice = res;
                                                                                            getRSI(res).then((res) => {
                                                                                              data.RSI = res.reverse();
                                                                                              data.closingPrice = data.closingPrice.reverse();
                                                                                              response.push(data);
                                                                                              console.log(data)
                                                                                            });
                                                                                          });
                                                                                          promises.push(promise) //---> save the reference to a promise
                                                                                        }, i * 1000);
                                                                                      });
                                                                                      await Promise.all(promises) //---> await for all promises to be resolved, then print the result
                                                                                      console.log(response);
                                                                                    } catch (error) {
                                                                                      console.log(error.message);
                                                                                    }
                                                                                  }
                                                                                  main();
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/71890607

                                                                                  QUESTION

                                                                                  How to connect Metamask to Web3J (java)
                                                                                  Asked 2022-Apr-03 at 03:03

                                                                                  I am trying to connect my Metamask wallet to my Java Spring-Boot backend. I was trying to follow the example here. I am able to autogenerate the nonce and receive the wallet ID without a problem. I am trying to verify the signed nonce from the Wallet on the server to make sure that the sender is indeed who they say they are. However, I am unable to find any documentation on Web3J to do this.

                                                                                  Is web3j not the right package to use for this? The example shows how to do the verification on NodeJS based on javascript but I don't find any example on how to do this on Java.

                                                                                  My understanding is that the public key is the wallet ID itself and that the message is the nonce signed by the private key of the wallet which is not shared for obvious reasons. According to this, I would need to "decrypt" the message using the public key and see if the decrypted message is same as the nonce that the backend sent to Metamask to sign. Is this correct?

                                                                                  Here is my code to create and send the nonce to UI:

                                                                                  public User findUserByPublicAddress(String publicWalletId) {
                                                                                      User u = userRepository.findByPublicWalletId(publicWalletId);
                                                                                      if(u == null) {
                                                                                          u = new User("", "", "", null, publicWalletId, "");
                                                                                          String nonce = StringUtil.generateRandomAlphaNumericString();
                                                                                          u.setNonce(nonce);
                                                                                          userRepository.saveAndFlush(u);
                                                                                      }
                                                                                      return u;
                                                                                  }
                                                                                  

                                                                                  Here, I see if the user is already in my system and if they are not, then I just create a temporary user with a random nonce generated and saved in the DB. This nonce is sent to the UI for Metamask to sign. However, I am not sure how to do the verification part of it.

                                                                                  ANSWER

                                                                                  Answered 2022-Apr-03 at 03:03

                                                                                  I was able to figure this out finally. My initial understanding was incorrect. I was not supposed to attempt to decrypt the message to retrieve the nonce. Rather I needed to use the nonce to see if I can retrieve the public key of the private key used to sign the message and see if that public key retrieved matches the wallet ID.

                                                                                  The algorithm:
                                                                                  1. Receive the signed message and the wallet ID from the client
                                                                                  2. Retrieve the nonce sent to the client with the same wallet ID
                                                                                  3. Generate the hash of the nonce
                                                                                  4. Generate the signature data from the message. This basically retrieves the V, R and S and. R and S are the outputs of the ECDSA Signature and V is the Recovery ID.
                                                                                  5. Using the ECDSA Signature and Hash of the Nonce, generate the possible public Key that was used to sign the message. At max, one will be able to generate 4 possible public keys for this message.
                                                                                  6. Check if any of the generated keys match public wallet ID that the client sent. If it matches, then we have a positive match. Generate the JWT and respond to the client. If not, we know that the nonce was not signed by the Metamask wallet we expected.
                                                                                  The Code:

                                                                                  Here is a sample code for UI (JavaScript and HTML):

                                                                                  web3.eth.sign(
                                                                                      web3.utils.sha3(nonce),
                                                                                      window.userWalletAddress)
                                                                                  .then((message) => {
                                                                                      console.log(message)
                                                                                      data['message'] = message // BODY
                                                                                      var xmlReq = new XMLHttpRequest();
                                                                                      xmlReq.onreadystatechange = function() {
                                                                                          if(this.readyState == 4 && this.status == 200) {
                                                                                              response = this.responseText
                                                                                              console.log(response)
                                                                                          }
                                                                                      };
                                                                                      xmlReq.open("POST", "/api/users/login", true)
                                                                                      xmlReq.setRequestHeader('Content-Type', 'application/json')
                                                                                      xmlReq.send(JSON.stringify(data))
                                                                                  })
                                                                                  

                                                                                  The web3.eth.sign() takes the message to be signed and takes the wallet ID that is signing it. This is then sent to the backend. In the backend:

                                                                                  public User signin(UserLoginDTO loginDetails, HttpServletResponse response) {
                                                                                      try {
                                                                                          // Get the wallet ID and signed message from the body stored in the DTO
                                                                                          String publicWalletId = loginDetails.getPublicWalletId();
                                                                                          String message = loginDetails.getMessage();
                                                                                  
                                                                                          // Find the nonce from the DB that was used to sign this message
                                                                                          User user = userRepository.findByPublicWalletId(publicWalletId);
                                                                                          String nonce = user.getNonce();
                                                                                  
                                                                                          // Generate the HASH of the Nonce
                                                                                          byte[] nonceHash = Hash.sha3(nonce.getBytes()) // org.web3j.crypto.Hash
                                                                                  
                                                                                          // Generate the Signature Data
                                                                                          byte[] signatureBytes = Numeric.hexStringToByteArray(message); // org.web3j.utils.Numeric
                                                                                          
                                                                                          byte v = (byte) ((signatureBytes[64] < 27) ? (signatureBytes[64] + 27) : signatureBytes[64]);
                                                                                          byte[] r = Arrays.copyOfRange(signatureBytes, 0, 32);
                                                                                          byte[] s = Arrays.copyOfRange(signatureBytes, 32, 64);
                                                                                          
                                                                                          SignatureData signatureData = new SignatureData(v, r, s); // org.web3j.crypto.Sign.SignatureData
                                                                                  
                                                                                          // Generate the 4 possible Public Keys
                                                                                          List recoveredKeys = new ArrayList<>();
                                                                                          for(int i = 0; i < 4; i++) {
                                                                                              BigInteger r = new BigInteger(1, signatureData.getR());
                                                                                              BigInteger s = new BigInteger(1, signatureData.getS());
                                                                                              ECDSASignature ecdsaSignature = new ECDSASignature(r, s);
                                                                                              BigInteger recoveredKey = Sign.recoverFromSignature((byte)i, ecdsaSignature, nonceHash);
                                                                                              if(recoveredKey != null) {
                                                                                                  recoveredKeys.add("0x" + Keys.getAddressFromKey(recoveredKey)); // org.web3j.crypto.Keys
                                                                                              }
                                                                                          }
                                                                                  
                                                                                          // Check if one of the generated Keys match the public wallet ID.
                                                                                          for(String recoveredKey : recoveredKeys) {
                                                                                              if(recoveredKey.equalsIgnoreCase(publicWalletId)) { 
                                                                                                  // Add Code here to create the JWT and add that to your HttpServletResponse. Not shown here.
                                                                                                  return user;
                                                                                              }
                                                                                          }
                                                                                          throw new CustomException("Message Sign Invalid", HttpStatus.UNAUTHORIZED);
                                                                                      }
                                                                                      catch (Exception ex) {
                                                                                           // Custom Error Handling.
                                                                                      }
                                                                                  }
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/71630833

                                                                                  QUESTION

                                                                                  Binance API: status: 400, error code: -1013, error message: Filter failure: PRICE_FILTER
                                                                                  Asked 2022-Mar-16 at 20:14

                                                                                  status: 400, error code: -1013, error message: Filter failure: PRICE_FILTER

                                                                                  I am trying to create a new order to sell all SCRT that are on my account and I cannot figure out what is the problem.

                                                                                  The filters for SCRTBUSD are:

                                                                                  {'filterType': 'PRICE_FILTER', 'minPrice': '0.00100000', 'maxPrice': '1000.00000000', 'tickSize': '0.00100000'}
                                                                                  

                                                                                  The code I am using:

                                                                                  client = Spot(key=key, secret=secret)
                                                                                  
                                                                                  account = client.account()
                                                                                  for asset in account['balances']:
                                                                                      if asset['asset'] == 'SCRT':
                                                                                          quantity = asset['free']
                                                                                          break
                                                                                  
                                                                                  # price = client.ticker_price('SCRTBUSD')['price']
                                                                                  price = client.avg_price('SCRTBUSD')['price']
                                                                                  
                                                                                  params = {
                                                                                          "symbol": 'SCRTBUSD',
                                                                                          "side": "SELL",
                                                                                          "type": "LIMIT",
                                                                                          "timeInForce": "GTC",
                                                                                          "quantity": quantity,
                                                                                          "price": round(float(price) * float(quantity), 8)
                                                                                      }
                                                                                  
                                                                                  try:
                                                                                      response = client.new_order(**params)
                                                                                  except ClientError as error:
                                                                                      print(f"Found error. status: {error.status_code}, error code: {error.error_code}, error message: {error.error_message}")
                                                                                  
                                                                                  

                                                                                  The final price (round(float(price) * float(quantity), 8)) is 30.68230251.

                                                                                  I have also thought that maybe by "price" they mean a price for 1 BUSD and I put the "price": float(price) and I have got the same error.

                                                                                  I tried both avg_price and ticker_price. Any ideas on how to set the right price?

                                                                                  ANSWER

                                                                                  Answered 2022-Mar-16 at 20:14

                                                                                  tickSize for SCRTBUSD is: 0.001.

                                                                                  Therefore, you have to round the quantity to the next 0.001. For example:

                                                                                  round(30.68230251, 3)
                                                                                  

                                                                                  For more information about the tickSize, check the exchangeInfo on the Binance API documentation.

                                                                                  Source https://stackoverflow.com/questions/71499941

                                                                                  QUESTION

                                                                                  Solana: Parse Token Data
                                                                                  Asked 2022-Mar-15 at 03:45

                                                                                  How does one parse the data in an SPL token account? It contains a binary blob and I'd like to get the token type and number of tokens.

                                                                                  An acceptable language is solana-cli, web3.js, or solana.py. I'm looking for any solution.

                                                                                  ANSWER

                                                                                  Answered 2022-Mar-15 at 03:45

                                                                                  The RPC give a great way to parse the data by default. You can use getParsedAccountInfo in web3.js.

                                                                                  Let's take the token account at 9xqnnfeonbsEGSPgF5Wd7bf9RqXy4KP22bdaGmZbHGwp

                                                                                  import { Connection, PublicKey, ParsedAccountData, clusterApiUrl } from '@solana/web3.js';
                                                                                  
                                                                                  (async () => {
                                                                                    const connection = new Connection(clusterApiUrl('mainnet-beta'));
                                                                                    const tokenAccount = await connection.getParsedAccountInfo(new PublicKey('9xqnnfeonbsEGSPgF5Wd7bf9RqXy4KP22bdaGmZbHGwp'));
                                                                                    console.log((tokenAccount.value?.data as ParsedAccountData).parsed);
                                                                                  })();
                                                                                  
                                                                                  /**
                                                                                  {
                                                                                    info: {
                                                                                      isNative: false,
                                                                                      mint: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',
                                                                                      owner: 'Ccyrkw1FdRVsfnt7qptyUXqyffq3i59GSPN1EULqZN6i',
                                                                                      state: 'initialized',
                                                                                      tokenAmount: {
                                                                                        amount: '738576212',
                                                                                        decimals: 6,
                                                                                        uiAmount: 738.576212,
                                                                                        uiAmountString: '738.576212'
                                                                                      }
                                                                                    },
                                                                                    type: 'account'
                                                                                  }
                                                                                  **/
                                                                                  

                                                                                  Here we can see the output of the tokenAccount has a mint of EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v(USDC) owned by address Ccyrkw1FdRVsfnt7qptyUXqyffq3i59GSPN1EULqZN6i with an amount of 738.576212. That's all the data we need from a token account.

                                                                                  Source https://stackoverflow.com/questions/71471948

                                                                                  QUESTION

                                                                                  Pinescript security function for colour boolean with mutable variable
                                                                                  Asked 2022-Mar-14 at 12:47

                                                                                  I'm having issues with plotting the Coral Trend indicator colour code, into my 15min 21EMA security function. Since the Coral Trend indicator colour code has a mutable variable, I cannot resolve it. This is next level coding for me, haha.

                                                                                  I will post

                                                                                  • the code
                                                                                  • a screenshot
                                                                                  • the problem
                                                                                  • the solution I tried

                                                                                  The code:

                                                                                  //@version=5
                                                                                  
                                                                                  indicator(title='CT Indi', shorttitle='', overlay=true)
                                                                                  
                                                                                  
                                                                                  sm = input(21, title='Smoothing Period')
                                                                                  cd = input(0.4, title='Constant D')
                                                                                  
                                                                                  di = (sm - 1.0) / 2.0 + 1.0
                                                                                  c1 = 2 / (di + 1.0)
                                                                                  c2 = 1 - c1
                                                                                  c3 = 3.0 * (cd * cd + cd * cd * cd)
                                                                                  c4 = -3.0 * (2.0 * cd * cd + cd + cd * cd * cd)
                                                                                  c5 = 3.0 * cd + 1.0 + cd * cd * cd + 3.0 * cd * cd
                                                                                  i1 = 0.0
                                                                                  i1 := c1 * request.security(syminfo.tickerid, "15", close) + c2 * nz(i1[1])
                                                                                  i2 = 0.0
                                                                                  i2 := c1 * i1 + c2 * nz(i2[1])
                                                                                  i3 = 0.0
                                                                                  i3 := c1 * i2 + c2 * nz(i3[1])
                                                                                  i4 = 0.0
                                                                                  i4 := c1 * i3 + c2 * nz(i4[1])
                                                                                  i5 = 0.0
                                                                                  i5 := c1 * i4 + c2 * nz(i5[1])
                                                                                  i6 = 0.0
                                                                                  i6 := c1 * i5 + c2 * nz(i6[1])
                                                                                  
                                                                                  bfr = -cd * cd * cd * i6 + c3 * i5 + c4 * i4 + c5 * i3
                                                                                  
                                                                                  bfrC = bfr > nz(bfr[1]) ? color.white : bfr < nz(bfr[1]) ? #056656 : na
                                                                                  
                                                                                  plot(request.security(syminfo.tickerid, "1", ta.ema(close, 315)), title='15m 21 EMA', color=bfrC, linewidth=2)
                                                                                  

                                                                                  The screenshot:

                                                                                  The problem:

                                                                                  As can be seen in the screenshot on the 15min timeframe (right bottom): the 21 EMA is plotted and changes colour according to the rules in the code. This is great! Now I want to take it to other timeframes (especially lower ones). On the top and left bottom we find the 5min and 10min chart. The 15min 21 EMA is plotted there, but the colour changes is not the same as on the 15min timeframe. It takes over the information of the current timeframe (thus here 5min and 10min). How do I get to cycle a mutable variable in to a security function in to a colour boolean?

                                                                                  The solution I tried:

                                                                                  So I thought if I would take the line that creates the colour switch, and put it into a security function as well, things would work:

                                                                                  plot(request.security(syminfo.tickerid, "1", ta.ema(close, 315)), title='15m 21 EMA', color=request.security(syminfo.tickerid, "15", bfrC), linewidth=2)
                                                                                  

                                                                                  But then I get the 'Cannot use a mutable variable as an argument.....' comment. Seems like a function() => should be used. But how do I use this for that colour boolean?

                                                                                  UPDATE

                                                                                  When I copy this code from the answers into Pinescript I get a regular 21 EMA for the specific time frame, and the colouring is not as wanted (15min).

                                                                                  I made some progress on my own. But I'm stuck on spaces in between. Here is the code:

                                                                                  //@version=5
                                                                                  
                                                                                  indicator(title='CT Indi', shorttitle='', overlay=true)
                                                                                  
                                                                                  
                                                                                  sm = input(21, title='Smoothing Period')
                                                                                  cd = input(0.4, title='Constant D')
                                                                                  
                                                                                  di = (sm - 1.0) / 2.0 + 1.0
                                                                                  c1 = 2 / (di + 1.0)
                                                                                  c2 = 1 - c1
                                                                                  c3 = 3.0 * (cd * cd + cd * cd * cd)
                                                                                  c4 = -3.0 * (2.0 * cd * cd + cd + cd * cd * cd)
                                                                                  c5 = 3.0 * cd + 1.0 + cd * cd * cd + 3.0 * cd * cd
                                                                                  i1_func() =>
                                                                                      i1 = 0.0
                                                                                      i1 := c1 * request.security(syminfo.tickerid, "15", close) + c2 * nz(i1[1])
                                                                                  i2_func() =>
                                                                                      i2 = 0.0
                                                                                      i2 := c1 * i1_func() + c2 * nz(i2[1])
                                                                                  i3_func() =>
                                                                                      i3 = 0.0
                                                                                      i3 := c1 * i2_func() + c2 * nz(i3[1])
                                                                                  i4_func() =>
                                                                                      i4 = 0.0
                                                                                      i4 := c1 * i3_func() + c2 * nz(i4[1])
                                                                                  i5_func() =>
                                                                                      i5 = 0.0
                                                                                      i5 := c1 * i4_func() + c2 * nz(i5[1])
                                                                                  i6_func() =>
                                                                                      i6 = 0.0
                                                                                      i6 := c1 * i5_func() + c2 * nz(i6[1])
                                                                                  
                                                                                  bfr = -cd * cd * cd * request.security(syminfo.tickerid, "15", i6_func()) + c3 * request.security(syminfo.tickerid, "15", i5_func()) + c4 * request.security(syminfo.tickerid, "15", i4_func()) + c5 * request.security(syminfo.tickerid, "15", i3_func())
                                                                                  
                                                                                  b1 = bfr > nz( bfr[1] )
                                                                                  b2 = bfr < nz( bfr[1] )
                                                                                  
                                                                                  bfrC = b1 ? color.white : b2 ? #056656 : na
                                                                                  
                                                                                  plot(request.security(syminfo.tickerid, "1", ta.ema(close, 315)), title='15m 21 EMA', color=bfrC, linewidth=2)
                                                                                  

                                                                                  I am looking for a solution where the colouring (bfrC) is the same as the previous one. So, to me it seems, where : na is something like : bfrC[1]. This line: bfrC = b1 ? color.white : b2 ? #056656 : na

                                                                                  Anyone solution? Thanks!!

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-28 at 20:23

                                                                                  You have to use the request.security() function in global scope, and only then use it.

                                                                                  You can do something like this:

                                                                                  //@version=5
                                                                                  
                                                                                  indicator(title='CT Indi', shorttitle='', overlay=true)
                                                                                  
                                                                                  myTickerClose = request.security(syminfo.tickerid, "15", close)
                                                                                  
                                                                                  sm = input(21, title='Smoothing Period')
                                                                                  cd = input(0.4, title='Constant D')
                                                                                  
                                                                                  di = (sm - 1.0) / 2.0 + 1.0
                                                                                  c1 = 2 / (di + 1.0)
                                                                                  c2 = 1 - c1
                                                                                  c3 = 3.0 * (cd * cd + cd * cd * cd)
                                                                                  c4 = -3.0 * (2.0 * cd * cd + cd + cd * cd * cd)
                                                                                  c5 = 3.0 * cd + 1.0 + cd * cd * cd + 3.0 * cd * cd
                                                                                  i1 = 0.0
                                                                                  i1 := c1 * myTickerClose + c2 * nz(i1[1])
                                                                                  i2 = 0.0
                                                                                  i2 := c1 * i1 + c2 * nz(i2[1])
                                                                                  i3 = 0.0
                                                                                  i3 := c1 * i2 + c2 * nz(i3[1])
                                                                                  i4 = 0.0
                                                                                  i4 := c1 * i3 + c2 * nz(i4[1])
                                                                                  i5 = 0.0
                                                                                  i5 := c1 * i4 + c2 * nz(i5[1])
                                                                                  i6 = 0.0
                                                                                  i6 := c1 * i5 + c2 * nz(i6[1])
                                                                                  
                                                                                  bfr = -cd * cd * cd * i6 + c3 * i5 + c4 * i4 + c5 * i3
                                                                                  
                                                                                  bfrC = bfr > nz(bfr[1]) ? color.white : bfr < nz(bfr[1]) ? #056656 : na
                                                                                  
                                                                                  ema21 = ta.ema(myTickerClose, 21)
                                                                                  
                                                                                  plot(ema21, title='15m 21 EMA', color=bfrC, linewidth=2)
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/71299052

                                                                                  QUESTION

                                                                                  How do you close a websocket connection if the API page is invalid
                                                                                  Asked 2022-Feb-26 at 21:50

                                                                                  I am working with the Binance API. I am connecting to their API and trying to assess if Binance has a list of assets on their platform or not. The list of assets is seen below:

                                                                                  assets = ['tribe', 'pax']
                                                                                  

                                                                                  I pass this through to their API by inserting the name of the assets into the SOCKET link:

                                                                                  SOCKET = f"wss://stream.binance.com:9443/ws/{asset}usdt@ticker"
                                                                                  

                                                                                  I know the asset does exist on their website if on_message is called, because then I have accomplished a consistent connection with their API and it will keep printing messages unless I close the connection (which I do). However, if no message is received in n time I know they do not have the asset I am looking for. In this case Binance does have tribe, but not pax. I want to close the connection if the asset is not on their website after n time, how do I do this?

                                                                                  import ssl
                                                                                  import websocket
                                                                                  
                                                                                  def on_open(ws):
                                                                                      print('connection: successful')
                                                                                  
                                                                                  
                                                                                  def on_close(ws, *args):
                                                                                      print('connection: lost')
                                                                                      print("---------------------------------------------------")
                                                                                      ws.close()
                                                                                  
                                                                                  
                                                                                  def on_message(ws, message):
                                                                                      print("message received")
                                                                                      print()
                                                                                      ws.close()
                                                                                  
                                                                                  
                                                                                  def on_error(ws, message):
                                                                                      print(message)
                                                                                      print()
                                                                                  
                                                                                  
                                                                                  assets = ['tribe', 'pax']
                                                                                  for asset in assets:
                                                                                      print(asset)
                                                                                      SOCKET = f"wss://stream.binance.com:9443/ws/{asset}usdt@ticker"
                                                                                  
                                                                                  
                                                                                      ws = websocket.WebSocketApp(SOCKET, on_open=on_open, on_close=on_close, on_message=on_message,
                                                                                                                  on_error=on_error)
                                                                                  
                                                                                      ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})
                                                                                  

                                                                                  I have attempted to write:

                                                                                  if on_message == False:
                                                                                      ws.close()
                                                                                  

                                                                                  however this does not work because on_message is not even being called as far as my knowledge goes.

                                                                                  Here is the Binance API documentation: https://github.com/binance/binance-spot-api-docs/blob/master/web-socket-streams.md#klinecandlestick-streams Here is the websocket-client documentation: https://websocket-client.readthedocs.io/en/latest/examples.html

                                                                                  ANSWER

                                                                                  Answered 2021-Sep-21 at 14:37

                                                                                  Try this:-

                                                                                  import websocket
                                                                                  import ssl
                                                                                  import time
                                                                                  from threading import Thread
                                                                                  
                                                                                  
                                                                                  class Binance():
                                                                                      def __init__(self, asset, timeout=5):
                                                                                          self.url = f'wss://stream.binance.com:9443/ws/{asset}usdt@ticker'
                                                                                          self.ws = None
                                                                                          self.mr = False
                                                                                          self.timeout = timeout
                                                                                  
                                                                                      def start(self):
                                                                                          self.ws = websocket.WebSocketApp(self.url, on_message=self.on_message)
                                                                                          Thread(target=self.monitor).start()
                                                                                          self.ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})
                                                                                  
                                                                                      def on_message(self, ws, message):
                                                                                          self.mr = True
                                                                                          print(message)
                                                                                  
                                                                                      def stop(self):
                                                                                          if self.ws:
                                                                                              self.ws.close()
                                                                                              self.ws = None
                                                                                  
                                                                                      def monitor(self):
                                                                                          while True:
                                                                                              time.sleep(self.timeout)
                                                                                              if not self.mr:
                                                                                                  self.stop()
                                                                                                  break
                                                                                              self.mr = False
                                                                                  
                                                                                  
                                                                                  def runner(asset):
                                                                                      Binance(asset).start()
                                                                                  
                                                                                  
                                                                                  for asset in ['pax', 'tribe']:
                                                                                      Thread(target=runner, args=(asset,)).start()
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/69267777

                                                                                  QUESTION

                                                                                  What token type is ETH on the Polygon network?
                                                                                  Asked 2022-Feb-11 at 10:55

                                                                                  I am looking to work with ETH tokens on the Polygon network. My aim is to build a simple payment splitting application. Primarily to split royalties from Opensea. The issue I have come across is that Opensea doesn't seem to pay royalties in Matic token, instead, royalties are paid in ETH (plus other tokens).

                                                                                  I understand how to handle the network native, Matic, as well as ERC20 tokens. My main question is, what token type is ETH on the Polygon network? Is it an ERC20 (or similar) used to represent ETH on Polygon or does it have a special token type and privileges by virtue of Polygon being a layer two solution for Ethereum?

                                                                                  I'm sorry if this is a basic question, I tried to find answers online but because of the keywords all of the results were about bridging ETH to Polygon.

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-11 at 10:55

                                                                                  Opensea uses WETH token on Polygon, which is an ERC-20 token representing the Ethereum mainnet ETH.

                                                                                  Please note, the "purple" Polygon ETH you see on OpenSea, is actually WETH (Wrapped Ether) on the blockchain level of Polygon.

                                                                                  Source: https://support.opensea.io/hc/en-us/articles/4403264773523-How-do-I-find-my-funds-on-Polygon-

                                                                                  Source https://stackoverflow.com/questions/71078280

                                                                                  QUESTION

                                                                                  How to programmatically validate Tether (TRC20) Wallet Addresses in PHP?
                                                                                  Asked 2022-Feb-09 at 10:38

                                                                                  I am having an issue related to validating cryptocurrency wallet addresses, specifically USDT.

                                                                                  USDT can be validated either as a BTC or ETH address, depending on the network type.

                                                                                  Basically it goes like that:

                                                                                  • If cryptocurrency is USDT and chain type is ERC20, validate the address against ETH address format.
                                                                                  • If cryptocurrency is USDT and wallet type is OMNI, validate the address against BTC address format.

                                                                                  I haven't managed to find a specific validation for USDT:TRC20 addresses and I am not sure how to validate them.

                                                                                  ANSWER

                                                                                  Answered 2021-Oct-15 at 06:32

                                                                                  trc20 address features:

                                                                                  An encoded Mainnet address begins with T and is 34 bytes in length.

                                                                                  Source https://stackoverflow.com/questions/69465635

                                                                                  QUESTION

                                                                                  Multiple NFTs from the same source
                                                                                  Asked 2022-Feb-06 at 09:02

                                                                                  General NFT question, but don't flame me, I really tried to find the answer.

                                                                                  Could NFT be created from the same image or copy of this image?

                                                                                  For example, take this NFT Lion Cat that I created: https://rarible.com/token/0x60f80121c31a0d46b5279700f9df786054aa5ee5:1200950?

                                                                                  Can someone download the image and create an NFT from it?

                                                                                  I mean, isn't it part of the idea that this is original content by me and I have the copyrights for it?

                                                                                  In the Image area, you got the RAW image that proves you took this picture, nobody but the photographer has this RAW image. But to create this image NFT I didn't have to provide it.

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-06 at 09:02

                                                                                  Could NFT be created from the same image or copy of this image?

                                                                                  Can someone download the image and create an NFT from it?

                                                                                  Yes to both questions. It is technically possible to create multiple NFTs that all represent the same image. They can be placed in the same collection, as well as across multiple collections.

                                                                                  As NFTs basically contain links to this image, it's not possible to prevent someone from creating a link to a public resource, i.e. from creating another NFT representing the same image.

                                                                                  I mean, isn't it part of the idea that this is original content by me and I have the copyrights for it?

                                                                                  The ERC-721 standard mostly defines just the technical specifications. But it doesn't really cover the licensing, ownership/authorship of the underlying resource, and other non-technical topics.

                                                                                  An NFT only proves ownership of the token - not copyrights of the image. Also, it proves ownership by an address - not by a person. Because there can be zero to multiple people holding a private key to the same address (holding the NFT representing the image).

                                                                                  Source https://stackoverflow.com/questions/68816228

                                                                                  QUESTION

                                                                                  `ValueError: x and y must be the same size` when calling mplfinance
                                                                                  Asked 2022-Jan-30 at 14:48
                                                                                  import mplfinance as mpf
                                                                                  import talib as ta
                                                                                  import matplotlib.pyplot as plt
                                                                                  import numpy as np
                                                                                  %matplotlib notebook
                                                                                  test=df
                                                                                  WMA20 = ta.WMA(test['close'], timeperiod=20)
                                                                                  WMA60 = ta.WMA(test['close'], timeperiod=60)
                                                                                  WMA100 = ta.WMA(test['close'], timeperiod=100)
                                                                                  WMA200 = ta.WMA(test['close'], timeperiod=200)
                                                                                  
                                                                                  # Set buy signals if current price is higher than 50-day MA
                                                                                  test['Buy'] = (test['close'] > WMA20) & (test['close'].shift(1) <= WMA20)
                                                                                  
                                                                                  #plot
                                                                                  tcdf =test[['close']]
                                                                                  tcdf=tcdf.reset_index()
                                                                                  tcdf['date'] = tcdf['date'].apply(lambda x: x.value)
                                                                                  
                                                                                  for i in range(len(test['Buy'])):
                                                                                      if test['Buy'][i]==True:
                                                                                         
                                                                                          apd = mpf.make_addplot(tcdf.iloc[i],type='scatter',markersize=20,marker='o')
                                                                                  
                                                                                  
                                                                                  mpf.plot(test,addplot=apd, type='candle',volume=True)
                                                                                  

                                                                                  I run this code and get this eror ---> 33 mpf.plot(test,addplot=apd, type='candle',volume=True) ValueError: x and y must be the same size

                                                                                  how I can fix it

                                                                                  tcdf:

                                                                                      date    close
                                                                                  0   1597622400000000000     16.560
                                                                                  1   1597708800000000000     16.120
                                                                                  2   1597795200000000000     15.834
                                                                                  3   1597881600000000000     17.842
                                                                                  4   1597968000000000000     16.387
                                                                                  5   1598054400000000000     18.936
                                                                                  6   1598140800000000000     18.170
                                                                                  7   1598227200000000000     18.074
                                                                                  8   1598313600000000000     17.023
                                                                                  9   1598400000000000000     17.322
                                                                                  10  1598486400000000000     17.649
                                                                                  11  1598572800000000000     18.294
                                                                                  

                                                                                  test:

                                                                                  time    open    high    low     close   volume  year    month   day     hour    Day_of_week     Buy     BelowMA
                                                                                  date                                                    
                                                                                  2020-08-17  00:00:00    15.499  16.956  15.228  16.560  1297237.309     2020    8   17  0   0   False   False
                                                                                  2020-08-18  00:00:00    16.560  17.578  16.010  16.120  968575.523  2020    8   18  0   1   False   False
                                                                                  2020-08-19  00:00:00    16.119  17.080  15.465  15.834  987213.085  2020    8   19  0   2   False   False
                                                                                  2020-08-20  00:00:00    15.825  17.949  15.807  17.842  915874.788  2020    8   20  0   3   False   False
                                                                                  2020-08-21  00:00:00    17.842  19.854  16.361  16.387  2428489.231     2020    8   21  0   4   False   False
                                                                                  2020-08-22  00:00:00    16.368  19.191  15.623  18.936  1969925.069     2020    8   22  0   5   False   False
                                                                                  2020-08-23  00:00:00    18.935  19.757  17.715  18.170  1223037.344     2020    8   23  0   6   False   False
                                                                                  2020-08-24  00:00:00    18.187  19.467  17.900  18.074  835648.518  2020    8   24  0   0   False   False
                                                                                  2020-08-25  00:00:00    18.068  18.261  16.132  17.023  1116590.644     2020    8   25  0   1   False   False
                                                                                  2020-08-26  00:00:00    17.023  18.040  16.837  17.322  1003044.736     2020    8   26  0   2   False   False
                                                                                  2020-08-27  00:00:00    17.324  18.200  16.420  17.649  1141649.079     2020    8   27  0   3   False   False
                                                                                  ... .
                                                                                  

                                                                                  I dont know why I get this eror

                                                                                  this line for error real number

                                                                                  tcdf['date'] = tcdf['date'].apply(lambda x: x.value)
                                                                                  

                                                                                  when it is not exist i get error must be real number, not Timestamp

                                                                                  ANSWER

                                                                                  Answered 2022-Jan-28 at 12:35

                                                                                  The problem is you are calling make_addplot() with only one data point at a time. There is also no need for the date index in the make_addplot() call; only the data.

                                                                                  Also, the length of data (number of rows) passed into make_addplot() must be the same as the length (number of rows) pass into plot().

                                                                                  make_addplot() should not be within the loop.

                                                                                  Try replacing this part of the code:

                                                                                  tcdf =test[['close']]
                                                                                  tcdf=tcdf.reset_index()
                                                                                  tcdf['date'] = tcdf['date'].apply(lambda x: x.value)
                                                                                  
                                                                                  for i in range(len(test['Buy'])):
                                                                                      if test['Buy'][i]==True:
                                                                                         
                                                                                          apd = mpf.make_addplot(tcdf.iloc[i],type='scatter',markersize=20,marker='o')
                                                                                  

                                                                                  with the following:

                                                                                  tcdf = test['close'].copy()
                                                                                  
                                                                                  for i in range(len(test['Buy'])):
                                                                                      if not test['Buy'].iloc[i]:
                                                                                         tcdf.iloc[i] = float('nan')
                                                                                  
                                                                                  apd = mpf.make_addplot(tcdf,type='scatter',markersize=20,marker='o')
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/70893025

                                                                                  Community Discussions, Code Snippets contain sources that include Stack Exchange Network

                                                                                  Vulnerabilities

                                                                                  No vulnerabilities reported

                                                                                  Install PoWToken

                                                                                  You can download it from GitHub.
                                                                                  You can use PoWToken like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

                                                                                  Support

                                                                                  For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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