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Etherscan is a search engine that allows Ethereum blockchain users to look up, confirm and validate transactions that have taken place on the blockchain.

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Solo mining run out of HDD space miner found solution is everything lost?

I have only one rx 580 card and just setup solomining on my pc without any advanced settings bios changes etc My OS is Windows 10 100% noob here so please be more descriptive with your answers What ...
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Started getting EventStructWrongData warning in my ERC20 Token Code

I suddenly started getting EventStructWrongData (very low-severity) warning in my Ethereum code in Etherscan. It was not there before, so how come it started showing up all of a sudden? This is the ...
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My transaction is pending and it seems like doesnt execute the transaction at all?

I wanted to transfer ERC20 tokens from MEW to another ERC20 token wallet. It seems like not moving. Now my transaction is pending and it doesn't showing up in myetherwallet as a pending status. Can ...
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12 views

Calling a contract from another contract leave transaction pending forever

I am developing a DApp on the Kovan Network on Remix and I am having trouble understanding the problem. I am tring to call the Wrapped Ether contract (WETH : https://kovan.etherscan.io/address/...
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13 views

Store ABI Value in var

I've finally managed to get my web3.js to work.. I did this only for the purpose to display one specific value on my website.. I'm not so good with jquery and hope you guys can help me out. This is ...
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12 views

Is there a way to get enode:// addresses of etherscan and infura nodes?

How can I get enode:// addresses of Infura and Etherscan nodes? Both mainnet and ropsten ones preferably. I would like to add them to my nodes peers list to be able to sync better. Thanks!
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Where do I find the “constructor arguments” for a contract deployed with Remix?

When try to verify token, I dont know what to put in for this line: Constructor Arguments ABI-encoded (For contracts that accept constructor parameters) I made token after looking at a YouTube ...
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23 views

What the “Time LastSeen” meanings?

If you check for all of pending transactions details, you will see the "Time LastSeen". Could someone explain to me: What the "Time LastSeen" meanings? What the differences between "Age" of ...
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23 views

why this contract can successfully do the transfer()

I am reading the source code of this erc20 token: https://etherscan.io/address/0xfdfd5db568f2ecf9b06a16116b9201b0500735b4#code the code is like this: contract VelixIDToken is ReleasableToken, ...
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10 views

Is there an API for looking up ENS records?

Currently I'm using this to do ens lookups: https://etherscan.io/enslookup But is there a public API I can use to do queries to see what each ens goes to?
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Can't find broadcasted transaction

I'm trying to broadcast a transaction hex: ...
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Etherscan: Verify and Publish Source Code - Error! Library Name and Address was provided but not used in the contract

Tried to verify my Smart Contract on Etherscan for Ropsten. Smart Contract is a library which actually also imports another library (which is already verified). Getting following error Error! The ...
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24 views

Contract NOT created when using “new” on testnet

I've got a contract which one of his functions creates a new contract in the following manner: (Solidity) function createCarrier() public { P2Carrier newCarrier = new P2Carrier(msg.sender); ...
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34 views

Transaction done, but nonce does not update and call to a function returns zero

I've used web3py to deploy a contract and send some transactions to it. I calculate the nonce this way: nonce = web3.eth.getTransactionCount(account, "pending") When I deploy the contract, ...
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35 views

How to use “etherscan” to push a raw transaction without running a node?

According to this answer, how to use etherscan to push a raw transaction without running a node? In this case, do not we need to install Parity or geth or any Ethereum client ?
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What's identification mark for a internal transaction?

I used Parity tracer, it return a lot of message with many opCode: CREATE, CALL, CALLCODE, DELEGATECALL, and SUICIDE. It may be 60,70 traces. But when you see in ropsten or etherscan, it show only 1,...
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Is there a way to use etherscan API (or another) to get a history of transactions for a specific ERC20 token for an ethereum account?

I want to be able to display the complete history of our token transfers in and out of users wallets. Is there an easy or established way to do this?
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27 views

Verifying Solidity Source Code on etherscan

I have verified several contracts on etherscan in the past without much issues but this time it is getting weird, makes me suspect there is some bug with etherscan in regards to contracts recently ...
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31 views

How to see event name in etherscan.io transaction event log?

In etherscan.io, I want to be able to see the event name (signature) in the transaction page event log, like here. Currently, I don't see it here. I'll note that the transaction is indeed sent to a ...
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What is the compiler version of a contract created by internal transaction? [duplicate]

I want to be able to verify and publish a contract source code on Etherscan.io. I have created a new contract from a factory contract, in which I successfully published and verified. When I come to ...
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1answer
26 views

What does the balance mean in EtherScan?

For example, IDEX has 40,767.582633880607462483 Ether. But I use BalanceAt function and only get 15.884 Ether. Why? Should I traversal all the tokens and query balanceOf("...
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47 views

Compile multiple contracts

When compiling a .sol file that contains multiple contracts you get multiple binaries. How do I know which one belongs to the root contract? For example looking at etherdelta contract code I can see ...
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65 views

How to list an erc20 token in an exchange site?

An erc20 token has been smart contracted in MyEtherWallet(Ropsten) and verified & published in etherscan.io. I want to list this token in an exchange I've built. Can I do it by installing a ...
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36 views

How to calculate Estimated Confirmation Duration of a pending transaction?

How I can calculate Estimated Confirmation Duration or Can someone give me a formula to calculate Estimated Confirmation Duration of a pending transaction like etherscan.io do?
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39 views

How To Read Etherscan Token Transfers

I'm noticing a lot of ether transfers into ERC20 token contracts months after the token's ICO finished. I am wondering how is this possible, and where these tokens are coming from, since tokens are ...
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54 views

How to listen to event of transfer of er20 token

I have account and people is going to send to me there erc20 tokens, I want to catch this events in my nodejs + web3 code, how can I do it? I made googling so it seams I have some options parse all ...
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1answer
48 views

how can i find the contract name from the address using the etherscan API?

I have the address but I want to know the name of contract. Is there any way to get that from the etherscan API?
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72 views

What does a position means in an ethereum Tx?

There are 2 fields in the following Ethereum Tx, named nonce & {position}. What does position mean?
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157 views

Ethereum Blockchain Size calculation from Etherscan

I was looking into Etherscan.io charts of Ethereum Block Count and Ethereum Average Block Size. Both of them have the data since 07/30/2015 and if one multiply both time-series (Ex. 07/30/2015 - 644 ...
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eth.blockNumber does not match any network's current block

I set up a geth full node on Rinkeby with the following command: /usr/bin/geth --syncmode fast --nousb --cache 3072 --trie-cache-gens 1024 --rpc --rpcaddr 127.0.0.1 --rpcport 8545 --networkid 4 2>&...
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1answer
25 views

Pending Transaction from locked token

I tried to send locked EOS to Etherdelta, and the transaction been pending for almost 4 days now. MEW can't find the transaction so I'm unable to cancel it nor do anything else even with higher gas ...
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53 views

Are there any famous and stable enode we can connect to?

I deployed geth on my server, but the peers are not stable. I found some active enodes from investoon and ethernodes, but there are seems not stable too. While we all know etherscan and infura ...
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Transaction remains pending on RINKEBY network

var Web3 = require('web3'); var Tx = require('ethereumjs-tx'); const fs = require('fs'); const solc = require('solc'); const generateWallet = require('ethereumjs-wallet'); var toAccount = 'TO ACCOUNT';...
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How are transactions broadcasted?

As far as I know, Geth stores pending items in their Txpool. Does "broadcast" means polling again and again to each peer clients until get processed? What's exact name of the function that ...
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consistently get no-source verify on Rink and Rop testnets when I have Optimize Compiler flagged

I have sent byte examples for my deploys to rop and rinkeby showing multiple evidence of code mis-match between remix genned to the testnets and that produced by etherscan verify.. EVERY time I use ...
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1answer
30 views

Retrieve contract byte code

How may I find the byte code of an arbitrary contract? Preferably using a website and not writing my own client.
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79 views

Do Etherscan stores all the events and transaction history?

To get the history of a transactions for an account, we have to traverse the whole chain everytime, but etherscan provides the entire history of all the accounts instantly. Similarly it does the same ...
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can anyone help me with etherscan api structure?

i want to create api like etherscan.io apis structure. do they have any github repository on the official apis so that i can study them. https://etherscan.io/apis this is the link to api docs. i just ...
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Not able to export to csv all transfer events of a specific contract on Ethplorer.io

I'm able to use the Export to csv function, but it's only giving me the most recent 1000 events. Any suggestions on how to get ALL (2100+) of the events in a csv file? https://ethplorer.io/address/...
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Constructor Arguments ABI-encoded - verification not working!

I think I must be going blind or something because I can not find the Constructor Arguments for this smart contract 0x3a2F46b0B0c187B152Db0c658b27E693f0A273a1 I have tried a number of options but ...
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28 views

Confirm Oraclize is not working on Ropsten? (No callback returned)

I have a contract on Ropsten testnet that was working fine up until 2 hours and 30 minutes ago. I don't believe it is an error on my side because the code hasn't been changed or redeployed. You can ...
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23 views

How do I change the sensitivity level of etherscan Similar Contract Search?

etherscan has a Search Similar Contract feature, with a sensitivity setting of 1-5, 5 being "exact match". However I can't seem to change this setting. Was the sensitivity feature removed / not ...
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1answer
26 views

How do I find how much money is stored on all deployed instances of a contract?

I am reviewing a certain contract, and would like to gauge how much money is stored on all deployed instances of this contract. Someone told me I can deploy a new instances of the contract to mainnet,...
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1answer
249 views

Encountered during contract execution [Reverted]

When trying to sent some ETH from myetherwallet getting followinf error: Warning! Error encountered during contract execution [Reverted] transaction links: https://etherscan.io/tx/...
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2answers
43 views

My contract doesnt get published on ropsten etherscan

I get the following error: Error! Unable to generate Contract ByteCode and ABI I've seen other people experiencing the same issue but their solutions don't work for my issue. I don't use libraries ...
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98 views

Can you deploy a contract from a Ledger Nano S using Remix?

I have deployed a contract from a Ledger Nano S before by connecting to MEW and deploying using Bytecode and ABI of the contract. However I do not know what compiler version MEW used and so cannot ...
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50 views

What's the Parent Hash in Uncle of Ethereum?

What's the Parent Hash in Uncle of Ethereum? Why I cannot locate the Parent Hash of an uncle block in Etherscan?
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etherscan kovan testnet didn't work?

It seems that etherscan's kovan tesnet has some problems? the block of etherscan fell behind others!! Is there another kovan testnet browser??
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128 views

Ethereum Transaction using API [closed]

I want to send Ethereum(ETH) from one individual to another individual using API. so please can you help me to solve out this one.
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185 views

eth.getBalance(eth.accounts[0]) always 0 on geth console

I want to deploy smart contract on rinkeby test network. I create account in Rinkeby test network.And connect with "Ethereum geth node".I successfully funded "https://faucet.rinkeby.io/". I also check ...