Category "blockchain"

What is the difference between Amazon managed Blockchain and Amazon Blockchain Templates?

I am a beginner in Blockchain and cloud and trying to setup a a hyperledger fabric environment on cloud, because I was facing some issues installing it in my pc

Adding member to existing hyperledger Fabric 1.2 network on amazonmanaged blockchain

I am exploring amazon managed blockchain. Network (Hyperledger Fabric 1.2) is created, first member is added, peer node is added and VPC Service endpoint is als

Deploy and expose chaincode as REST api on amazon managed blockchain hyperledger fabric 1.2

I have configured amazon managed blockchain setup with Hyperledger 1.2. The network is prepared with a single member and a single peer node. Hyperledger Fabric

Adding member to existing hyperledger Fabric 1.2 network on amazonmanaged blockchain

I am exploring amazon managed blockchain. Network (Hyperledger Fabric 1.2) is created, first member is added, peer node is added and VPC Service endpoint is als

error executing chaincode: failed to execute transaction: timeout expired while executing transaction

I write this chaincode and when I invoke it to read with GetOrgan the command is succeeded but when i want to add an organ with AddOrgan i have this error :

What language is used in Tezos .arl files?

So I read thru this Rarible code and they use the .arl files to write Tezos smart contracts. What language is .arl?

How can I filter pending transactions of a specific address web3.py

I'm wondering how I can get pending transaction of a specific address using web3.py I tried this but I don't know where I can put the address to get the pending

importing tronweb shows import error: cannot import name 'hashable' from 'collections'

After installing tronweb using 'pip install tronweb', when I try to import but it shows an import error which is cannot import name 'hashable' from 'collections

I get CORS error when I try to access metadata stored on IPFS

I am trying to fetch the metadata I stored on NFT.storage using axios, but each time I get this error: Access to XMLHttpRequest at 'ipfs://bafyreib6hf354pwtnwx

Hey Can someone explain something about this Smart contract to me - LP Staking Contract

hey so i was looking through github for a LP staking smart contract and i came across this // SPDX-License-Identifier: MIT pragma solidity 0.7.6; import "@open

Cannot read properties of undefined (reading 'toHexString') in ether.js

Please don't judge, i've no idea what to do and how to do :) My code: ether.js ( ^5.6.0) import { ThirdwebSDK } from '@3rdweb/sdk' import { ethers } from 'ether

How to connect to a deployed Polygon testnet contract?

I have a front-end / web3 application that connects to a deployed contract in the rinkeby ethereum networt. That is possible with the Web3 library, and creating

Solidity Error: member balance not found or not visible after argument-dependent lookup in contract

I'm getting this error in Solidity for the following code snippet: member balance not found or not visible after argument-dependent lookup in contract functio

ERROR: brownie.exceptions.RPCConnectionError: Able to launch RPC client, but unable to connect

The ganache-cli is unable to connect to the mainnet fork, as a result of which I can't run brownie test --networks mainnet-fork My test.py file looks like this:

ParserError: Source file requires different compiler version (current compiler is 0.8.7+commit.e28d00a7.Emscripten.clang)

I was eventually trying to run this code in remix IDE, where I was running this using 0.6.6 version of Solidity and ran into this error. I've tried using some o

Integrating MetaMask with Flutter Mobile Application

I want to add feature in my mobile app to send ether from one address to another address and for this I need to integrate metamask with my flutter mobile applic

how to get transaction history from blocks via web3?

I have a private chain now and I want to query the transaction histories.I know that web3 has provide those methods web3.eth.blockNumber/web3.eth.getBlockTransa

Uniswap swapExactTokensForTokens is making the transaction but not swapping between the coins

I'm trying to implement a basic swap between 2 coins, using ethers, but without success. I get success: https://ropsten.etherscan.io/tx/0x9d09a50143f8e1ec1c72b1