json-rpc | Implements of JSON-RPC 2.0 protocol and client/server stubs

I have a connection to the Phantom wallet.

I'm expecting phantom_balance() to return a balance or data containing the balance.

Do I have an error in the json-rpc formatting?

I'm getting the following JsonRpcEngine failure on the catch().

Hello and thank you in advance!

There is a JSON-RPC API, which I'm currently implementing. It can be tested here.

The problem is that if an incorrect DTO model is passed to SendAsync, JsonSerializer.Deserialize is going to throw a JsonException, which is not handled by my code. I know I've got to use SetException in some way, but I don't know how to do it, so here is the question. The exception message should be printed in the console as well.

Good afternoon,

I am new to Polygon (but have some Ethereum experience) and I am attempting to deploy the smart contract from the chainlink documentation https://docs.chain.link/docs/fulfilling-requests/ on the Polygon MUMBAI testnet, using remix as my in browser IDE.

I initially attempted to launch the original contract, as published in the docs. I got this error message:

"Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending? Internal JSON-RPC error. { "code": -32000, "message": "execution reverted" }"

When that failed, I trimmed it down to a smaller, more bare bones contract (in case there is a smart contract size limit on Polygon). Here is the trimmed down code:

This is a rough summary since these things exist in different views.

I have a react native app that uses wallet connect. this allows me to connect to a meta mask wallet on my phone and creates a connector instance.

T is fine for the method but doesn't work for the Dictionary without defining T on the class which I can't do. Is this possible? If not, is there another way to accomplish storing generic callback methods like this.

This class is for a Websockets Json-Rpc client. The API I'm connecting to allows you to subscribe to different data streams. I.e. stock quotes, stock trades, etc which all have different fields.

I'd like to be able to pass in the name of the data to subscribe to, then a callback, and it's param type, which will pass in the data once it's returned.

Background

I'm having an issue involving updates to a Fragment in an Android project. The app rolls dice for D&D players. The project employs an API from Random.Org to provide for greater entropy in random number generation compared to the Java Math.random method.

The app displays a Tab Layout with a View Pager which switches between three tabs - one to roll a single die, one to roll a set of dice, and one to show the roll history and log info. Roll Die is in position 0, Roll Set is in position 1, and History is in position 2. View Pager uses a FragmentPagerAdapter.

History contains two TextViews which I use to display roll results and logging data to ensure connection to the API went well. Data is passed from the RollDie and RollSet fragments to the Main Activity by two interfaces. The interface methods then send the data to the FragmentPagerAdapter, which in turn passes two String ArrayLists to the History fragment via bundle.

The Problem

My problem is the History tab only seems to update after the single die roll tab is loaded. When I roll a single die then check the history page, the relevant TextViews display as they should. When I roll a set however, the history page doesn't update until I return to the single die roll tab.

Any help with this issue would be greatly appreciated. Relevant code posted below.

Code from the API can be found on Github. I have also left out two classes I wrote called Die and DieSet - these work well and I figured this is already long enough. I'm happy to post those classes if anyone thinks it will help.

Code related to the API key has been omitted along with some IDE generated comments.

Main Activity

I am making an NFT marketplace. When I deployed my contract on the Mumbai-testnet. The createToken function might work cause it brings up the Metamask for the Gas Fee but after that, the Error occurs something regarding the ONWNERSHIP. (Error image and text is present below.)

STEPS which I follow

1. npm hardhat node
2. npm run dev
3. Selecting the Creating Page.
4. Enter all the details.
5. Click on Create an Asset which calls the createToken function.

then the error occurs.

Here is my NFT contract

I am trying to build a function that takes the following input

1. User wallet address
2. NFT address
3. Chain ID

and verifies if the NFT is in fact owned by the user on the given Chain.

If it was all within one chain, it could be done easily. But I want this function to be able to verify ownership across any given chain. I've read about Chainlink (Oracles) and they don't seem to provide such a function as far as I looked. To the best of my understanding, all interactions underneath happen via a JSON-RPC call. But I don't really know how to do that in solidity or any other language.

If anyone has any clue on how to approach this, please leave an answer.