enable to program FPGA

I'm trying to program the FPGA and boot over an SD card in xc7z020-clg400-1 zynq chip inside parallella, I can't figure out where is the problem, I have did vivado design , generate bitstream,...

Signing ethereum on blockcypher

I'm using Blockcypher API to accept and send ethereum (https://dev.blockcypher.com/eth/#creating-transactions). I've completed all the steps of creating the transaction, I've also signed it, but...

How to get keccak256 hash in Solidity

I just got started with solidity, i have used truffle to compile and deploy the code to ganache, everything works as i expect, i can call the other functions in the code, but there are certain...

Quorum Ethereum Truffle) Error: Number can only safely store up to 53 bits

I am actually learning smart contract programming on ethereum and I work with truffle. Right now I am making this tutorial here:...

What hash encryption algorithm does web3 use? ethereumjs-util Sha3 returns different result

I'm trying to properly sign an authentication method through web3's signPersonalMessage function. However, eth-sig-util's package which correctly authenticates does not produce the same hash with...

Pantheon On chain permissioning whitelisted nodes will not sync

I have successfully run the boot node, successfully deployed the contracts, and successfully whitelisted a second node (transaction confirms and the node shows up in the permissions UI. Enode...

How can I get more information on Python unexpected SIGABRT?

I'm using: MacOS Catalina, version 10.15 (19A603). python 3.7.4 pip3 Running and Debugging the following Python code within venv: import jose print(jose) from jose import jwt token =...

geth states eth_submitHashrate while mining with Claymore on Windows 10 with 2 GPU's

I am aiming on GPU-mining Ethereum on a Windows 10 PC with 2 Radeon RX590. geth version is 1.9.9-stable-01744997 cmd call to start geth: geth --rpc --syncmode "fast" --cache 4096 --etherbase [ADR]...

Failed to install gcc on Python-3.7-alpine docker container

I am trying to set up a Python docker container, when I run the command "docker-compose up" to build the Dockerfile it throws me this error message below. The docker file was successfully built...

cannot install web3 in python virtual_enviroment

I am using $pip install web3 inside a python_virtual_env, but I get the error below. Defaulting to user installation because normal site-packages is not writeable Collecting web3 Using...

Error Truffle Migrate "VM Exception while processing transaction: invalid opcode"

I testing Truffle Migrate with project Metacoin and deal with this error. $ truffle migrate Compiling your contracts... =========================== > Everything is up to date, there is nothing to...

Smart Contract Deployment to MainNet Pending Status

I have my own Ehereum cient node running OpenEthereum 3.0.1. I am using Truffle Suite to deploy my smart contract to MainNet, using my node as RPC_URL. The Truffle migration command issued the...

Handling user data and storage in Ethereum Dapps-Understanding

I've just started writing smart contracts and developing Dapps on the Ethereum Blockchain, basically users interacting with the smart contract and storing some lightweight data into the...

Findenode failed using bootnode in local geth network: invalid IP in response record: loopback address from non-loopback host

I followed an "old" tutorial (from 2018) about Building a local Ethereum network with Docker and Geth which is great but "deprecated" for Geth/v1.9.17. So i tried to come up with a new version for...

Error: Returned error: gas required exceeds allowance (12487794) or always failing transaction

I am trying to use a script which uses web3.js to transfer a specific amount of ERC20 tokens .I have made this script in such a way that if account doesnt has ether value it will try again and...

How to interact with OpenZeppelin proxy contracts from Truffle console?

I cannot figure out how to use @truffle/contract to interact with contracts deployed by package @openzeppelin/truffle-upgrades (ProxyAdmin and AdminUpgradeabilityProxy). I have deployed my...

Unable to install web3. I get an error saying version does not satisfy requirement rusty-rlp

I am trying to install some packages for Python. When installing web3, I get an error saying there is no version that satisfies rusty-rlp. Other packages get installed fine. I am using pip...

NodePort to a Geth pod doesn't work on k8s

I'm trying to deploy Geth(ethereum/client-go) pod on k8s. But I can't deploy the pod with error "Fatal: Error starting protocol stack: listen tcp: lookup "192.168.1.10": no such host". My...

Node, Yarn, Javascript - Error installing setprotocol dependencies

I am getting following error when adding a "setprotocol.js" dependency using Yarn (yarn add setprotocol.js) to my project. I am not familiar with Node or Yarn. I ran into this error when following...

Bittrex api V3 newOrder (UNAUTHORIZED)

The problem is with bittrex's API V3(link). I can get balances but when I try to use post and I use content object and post methods it gives me the error unauthorized. I think problem is with...

Building a chainlink node - ethereum ChainID doesn't match chainlink config.ChainID

I have an issue while launching my chainlink node with the ethereum client service (infura.io). I have this warning : Failed to connect to ethereum node wss://kovan.infura.io/ws/v3/...

Can not Deploy ERC20 Token using Truffle

I'd like to deploy follow "StandardERC20" token to kovan test net using Truffle. I want to deploy same contract like ...

How to fix 'Truffle Migrate' bytecode undefined error

Spent a few hours trying to figure this out - hoping someone has encountered this. (in testing) All the testing files run. When running truffle migrate --reset it logs the below. Versions that may...

Get info from binance blockchain

I'm new to blockchain. My question is how can I get binance blockchain info without explorers (get block by number, get transaction by hash)? ETH has tools such as geth or web3 where I can simply...

Array returned from Solidity assigned as bigNumber in Javascript

I am very new to Solidity and Javascript developments and I have faced some issues lately. Use case: Store an array of data from Javascript to Solidity. Return the stored array from Solidity back...

Unable to deploy NFT in terminal

I already deployed my smart contract to my wallet and connected it to my Alchemy account. Here are my codings (Note that my contract address, PUBLIC_KEY, PRIVATE_KEY, API_URL and alchemy address...

how to use webpack and web3 in react?

Hello I've just started a new react app from skratch. I followed instructions at https://medium.com/age-of-awareness/setup-react-with-webpack-and-babel-5114a14a47e9 this is my package.json file { ...

How to filter ETH transactions by address with web3.py

Is there a way to filter transactions by address? I have tried to do that with matching address with transaction dict key-value pairs ('from', 'to') but it takes too long. Is there a way to do...

Transaction complete, but NFT not transferred

I created a smart contract, minted an nft, and now trying to transfer it. My problem is that transaction completes fine- I can see it in etherscan etc, but nft is not transferred. What are the...

PIP failed to build package cytoolz

I'm trying to install eth-brownie using 'pipx install eth-brownie' but I get an error saying pip failed to build package: cytoolz Some possibly relevant errors from pip install: ...