blockchain | A demo of bitcoin implements with pure python | Cryptocurrency library

I am currently running hyperledger fabric v2.2. I have developed the chaincode using the contractapi and developing the application using fabric-sdk-go/pkg/gateway

How can i get the transaction status and the transaction payload? I am aware of the GetHistoryByKey() which is available in the contractapi but that doesn't works out for my application.

I know there is hyperledger-explorer which can be used to search transactions by TxID but my use-case is my application will be querying by TxID and then it will verify the status of that particular transaction (TxID).

Also, i have tried to achieve this using the fabsdk but i am getting an error when i try to create instantiate the fabsdk using the fabsdk.New(). There seems to be some compatibility issue with the connection-profile.json which i am using the fabric-sample project.

The error which i am getting is:

failed to create identity manager provider: failed to initialize identity manager for organization: MyOrgName: Either a cryptopath or an embedded list of users is required

The same connection-profile has been used in getting the network up and running, and everything seems to be working all good. I am able to submit and evaluate transactions.

SOLUTION

The system chaincodes are embedded in the peer itself. so we need to set the target otherwise it would just give the discovery error since the contract QSCC is not explicitly deployed on the channel.

Make sure to check the core.yaml file channel.system - the system chaincode should be enabled channel.system.qscc: enable

We have a code in production that in some situation may left-shift a 32-bit unsigned integer by more than 31 bits. I know this is considered undefined behavior. Unfortunately we can't fix this right now, but we can work this around, if only we can assume how it works in practice.

On x86/amd64 I know processor for shifts uses only the appropriate less-significant bits of the shift count operand. So that a << b is in fact equivalent to a << (b & 31). From the hardware design this makes perfect sense.

My question is: how does this work in practice on modern popular platforms, such as arm, mips, RISC and etc. I mean those that are actually used in modern PCs and mobile devices, not outdated or esoteric.

Can we assume that those behave the same way?

EDIT:

1. The code I'm talking about currently runs in a blockchain. It's less important how exactly it works, but at the very least we want to be sure that it yields identical results on all the machines. This is the most important, otherwise this can be exploited to induce a so-called chain split.

2. Fixing this means hassles, because the fix should be applied simultaneously to all the running machines, otherwise we are yet again at risk of the chain split. But we will do this at some point in an organized (controlled) manner.

3. Lesser problem with the variety of compilers. We only use GCC. I looked at the code with my own eyes, there's a shl instruction there. Frankly I don't expect it to be anything different given the context (shift operand comes from arbitrary source, can't be predicted at compile time).

4. Please don't remind me that I "can't assume". I know this. My question is 100% practical. As I said, I know that on x86/amd64 the 32-bit shift instruction only takes 5 least significant bits of the bit count operand.

How does this behave on current modern architectures? We can also restrict the question to little-endian processors.

Lets say i created an erc20 token. Now i want to make a smart contract that sends 1 coin to a user if they have X coins on another blockchain like bitcoin. Would that work? Can i read data from other blockchains using a cardano/ethereum/any other smart contract?

When trying to run my program using gradle bootRun, the error shows that

Failed to apply plugin 'org.springframework.boot' Configuration with name 'runtime' not found

The following is my build.gradle

Ive Been Trying to get an element from a page that Ive clicked on to get into the next page with soup.find_all. The problem is that it gives me the elements of the first page. Thanks in Advance.

The code:

I'm using Volley library to communicate with my API. I'm pretty new to Android and Kotlin and I'm really confused about extracting keys from the following JSON data

I am trying to set up a Hyperledger Fabric Network with Hyperledger Explorer. I spin up a VM on the digital ocean cloud with ubuntu OS. From there, I spin up 3 orderers node, and 2 peers node. Which result in total of 5 nodes. (I am using RAFT setup).

However, I encounter the error as below when trying to start the hyperledger fabric explorer docker-container images.

Ive Been Trying to Click a Button on https://blockchain.coinmarketcap.com/chain/bitcoin But With No Success (Shown in photo below). I Couldn't even get the element I wanted to click. If someone can help me find the element and how to click it, it would be very helpful to me. Thanks in advance. The Button Im trying to click is the page 2 button

I'm new to Lisk blockchain technology and I am looking for some technical guidance of how the details of it looks like.

What is the preffered Lisk blockchain block size?