All Questions

When I send about 100-120 requests in async, it is fine, the event will give me a response. But above 150 or so, I get "Invalid JSON RPC response: "" Web3JS 1.2.1 Geth Info: Version: 1.8.12-stable ...

transactions are not getting mined on rinkeby testnet and last block time is almost 2 hours ago. How did such things happen in a decentralised network?

For example I want to write a contract where when one passes the address of another contract to it, it will check whether this other contract has the name() function, and if the name() function exists,...

How to listen USDT contract? How to transfer my USDT to another USDT wallet? How to use both ETH and USDT in the same service? Etc. As you can see, I am new to these issues and would be grateful for ...

Are you allowed/is it possible to create a DAO that automatically renews its own Ethereum Name system domain with ether collected from a dapp? Are we allowed to do this or does it have to be a human ...

To get a value from contract storage I used this geth code succesfully: var contractAddress = '0x88e726de6cbadc47159c6ccd4f7868ae7a037730' var index = '...

Here's my code: contract company { struct contractDetails { string contractId; string companyA; string companyB; address A; address B; uint256 ...

Lets consider the scenario, if one node in India, finds the nonce (in pow) and it will generate the block and propagate to the network. How the block will move across the each and every node of the ...

Say you bought some ether when ethereum was at 1.0. Most of the time Ethereum requires you to update (via a hard fork) to the latest software. This means you'd need to update your wallet every time ...

storage.get.call() returns 0 Always for any integer value What may be the solution?

The concept of cryptocurrencies were to remove trust but tools like metamask require you to trust them with your front end.

How to cancel pending transaction of ethereum from exchange wallet? It is pending for around 36 hours now. There is no available tx hash.

It's my first time writing smart contract in solidity and using IPFS to develop my dapp. I don't know how to solve it and why it pops up this errorNo web3 instance injected, using Local web3. Error: ...

I saw today that outside investors put millions into the Minds social network. I thought dapps had no real way of making money? What are the investors actually investing in? -the website that wraps ...

I just saw that the Minds social network (a ethereum dapp I believe) is written in PHP. Their codebase is huge and I'm having trouble finding where their Smart contracts are written/how they are ...

We are trying to create an upgradeable smart contract. Our first decision is to segregate data and rules. This post focus on data. I read about the ERC930 (https://github.com/ethereum/EIPs/issues/930)....

After migration command line (truffle migrate --reset --network rinkeby), it is deploy. However i couldnt see at etherscan website when i enter the contract address. Should i see? Whatever then i ...

I am looking to create web wallets compatible with ethereum token standards, similar to this: https://wallet.callisto.network/ Can someone guide me to tutorials or guides as how to create this on my ...

Why 51% is explicitly mentioned to get control over the network?. Why not 50 or lesser ?. Anyway there is no central authority to decide, whether 51% is attained or not?.

Not able to get testing ETC from available faucet https://etcfaucet.info/, is there any other faucet or way to get ETC for tesing?

What to do to resolve below issue coming in initiating a truffle project? YuweideMacBook-Air:vantoken yuwei$ truffle version Truffle v4.1.4 (core: 4.1.4) Solidity v0.4.21 (solc-js) YuweideMacBook-...

I've followed this guide to subscribe to events. I succesfully subscribed to the new block headers using Infura provider. But when I try to use local geth node syncing in light mode, it connects, but ...

I want the amount of tokens to be a decimal number. but i heard that toBn is not supported decimals number. When I put in a decimal number, I faced the following error: while converting number 0.15 ...

i have a contract deployed over ethereum network and now i want to migrate all tokens from my contract and users to binance blockchain. What steps should i take to do so? I have used matic network for ...

I see a lot of discussion about date and time, timestamp... But they don't answer to my question: How can i convert from calendar format into timestamp format for comparing datetime? e.g: I have this ...

It`s my event. event Transfer(address sender, address receiver, string[] denoms, uint256[] amounts); And I view an Transfer event with watch() function, It`s the result. { address: "...

I noticed that using HDWalletProvider using the account parameter in the migration you get random/unexpected accounts during dryRun. I added a safety line that an address should be as expected but ...

I creaed private network using puppeth. There is ethstate website that is running in docker container. But I don't know where the source file is located on host machine for ethstate or dashboard ...

I have a pretty dummy contract: pragma solidity ^0.4.16; contract Ballot { struct Voter { uint weight; // weight is accumulated by delegation } } Compiled with remix I receive the ...

pragma solidity ^0.4.24; contract online_shopping{ struct item { uint price; string name; //string seller; } struct soldItems{ address customer; ...

In other words, you start your own node and then somehow add accounts you don't own (aka - you don't have their private keys)? I'm asking because I wanted to make my own node exposed via RPC/...

Hey I have written a factory for the ERC1400 Token by https://github.com/ConsenSys/ERC1400. When I run the test for issueByPartition I get a revert Error. Other tests like isIssuable works. If I ...

0 Hi i am trying to migrate contract by using getch on oracle virtual box ubuntu. Although 1_initial_migration.js deploying it shows Block: 0 Seconds:16743 and it is not completed to deploy and also ...

I've sent some ETH from the Ledger Live app to an exchange but I only used 1 Gwei and now the transaction is pending. It's been 20 hours. Will the transaction run out of gas eventually or will it go ...

For web3.py==v5.0.1: web3.geth.shh.newMessageFilter used to return the filter on v4.x.x but now it only returns the filter_id, so I received the filter object using w3.eth.filter(filter_id='0x'). ...

I am building a private chain and rpcaddr is set to 0.0.0.0But recently I found out that this private chain has been attacked by a foreign IP, it kept trying to transfer those worthless ether out from ...

I just set up a Block Explorer to interact with my private blockchain. The private Blockchain runs in a VM. The host system connects to the Block explorer (also on VM). When I have meta mask ...

I have a smart contract contains this method: function addOneUser (User memory _user) public { bytes32 hash = keccak256(abi.encode(_user.name)); users[hash] = _user; } I want ...

There is balance checking, transaction list and transaction receipt getting APIs available for Ethereum Classic (ETC)? Is ETC coin is only available on Ethereum Classic or its listed block explorer ...

Hi everyone hope I will be clear enough with the explanation because I couldn't find a proper solution. I am just trying to checkout an item with my buy function but it seems like I am stuck.Here is ...

pragma solidity ^0.5.8; contract HelloWorld { function test() pure returns (string) { return "HelloWorld"; } }

My genesis.json { "config": { "chainId": 9731, "homesteadBlock": 0, "eip150Block": 0, "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000", "eip155Block": 0, "...

I am a beginner. I would like to 3 mappings I know 2 mapping looks like this: mapping (address => mapping (address => uint256)) public allowed; and my question is: is 3 mappings look like ...

struct Rider{ //address riderAddr; uint rider_Id; bytes32 Rname; bool set; } mapping(address => Rider) public riders; function registerRider(address _riderAddr, uint _riderId, ...

If I only want to replace the proof of work to use different algorithm in ethereum (specifically to solve puzzles in Conway's game of life instead in cryptography). What files should I change in go-...

I have created a new ERC20 contract using this generator https://vittominacori.github.io/erc20-generator/ The status is "pending" , 21 hours at this time. Some explanation? Previously, I tried it ...

Are the timestamps of blocks for Ethereum only accepted when they are monotonically increasing? If yes, why? And why other blockchains like Bitcoin and other blockchains with shorter block time can ...

In enter link description here, it is said that "We have already determined that our current algorithm is highly suboptimal on low volatility and non-exploitability, and at the very least we plan to ...

It is said that "The use of (block_timestamp - parent_timestamp) // 10 (* now 9)as the main input variable rather than the time difference directly serves to maintain the coarse-grained nature of the ...

Have a look at this transaction for example: https://etherscan.io/tx/0x11d96986d36240a5e5e7eab78879aa841631705370e707f15f1488a0b9d6704a 0 gas, 0 ether but plenty of tokens transferred. Obviously the ...