Questions tagged [etherscan]

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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Error: Uncaught [TypeError: Cannot read property 'ContractName' of undefined]

I am trying to get source of open source verified contracts and write into a file at my local folder. I could write only one file (of first address) but for the rest i am facing captioned error. ...
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Invalid Address format - Etherscan.io APIs problem

I have download list of verified open source contract addresses's list and loaded into addresses[]. Now I want to download sourcecode/ABIs etc... of that contracts. Although, i have called setTimeOut ...
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Different address make same signature for one message

Is it possible two different wallets (address) make the same signature for one message? I have one message: '...
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How to query ERC20Token kinds [closed]

I want to query kinds of ERC20Token which some address holding,I used etherscan's api but only find ERC20Token's balance. Is there one api can finding?
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Api to get total transfer count of an ERC-721 Token

I want to retrieve the total number of an erc 721 token's transfers/ transactions. I couldn't scrape the transfers value from etherscan as well e.g. given here https://etherscan.io/token/...
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what kind of Hardware required for run geth private chain for ethereum on windows?

i need to help to find out what were the minimum hardware requirements needed for deploy the private chain on ethereum.
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Confusion regarding total number of ERC-721 Tokens

I have two questions: 1) I want to retrieve the list of all ERC-721 tokens. The main block explorer for Ethereum which is Etherscan shows 2,883 ERC-721 tokens on its website https://etherscan.io/...
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What is the best way to verify the comments in the contract code?

I have a contract that I want to be legally binding in traditional courts. It assigns rights, and for this I need legalese in the comments to describe the process. What is the best way to make sure ...
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1answer
48 views

web3.eth.getCode doesn't return the data shown on etherscan

For example, let's take contract address 0xdac17f958d2ee523a2206206994597c13d831ec7. Does anybody have an idea why the following two are totally different: The string returned from await web3.eth....
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Does Geth provide a private or public network?

I'm new to the Blockchain world, lacking experience and I'm looking for some assistance. I'm just syncing with ethereum network by using Geth and rinkeby network. by using this command: geth --...
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1answer
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Generate new address, Send and Get transaction then Check transaction

I'm just starting in the ethereum and trying to build an app using Web3 and Nodejs. I'll need your lights so I can get any idea to know how to resolve those points: I have my own public address and ...
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Web3js - Internal Transaction Data (Event Logs): Token Transfers, Contract Creations, & Internal ETH Transfers

I'm currently recording transaction data via Web3js, while directly connected to a local Geth full archive node via IPC, and I was wondering if there was a more elegant way to record internal ...
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Does transaction hash in Ropsten ( testnet) deprecate ever?

I want to know whether transaction hash created in testnet stay forever or after sometime it gets deleted? Like in IPFS garbage collector deletes unpinned files after two weeks. IPFS is also ...
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Why use nodepools or backends?

I have a fundamental question about eth/blockchain infrastructure. I see several posts talking about the need for backend node infrastructure when launching a dapp/ smart contract. This infrastructure ...
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1answer
37 views

Not able to generate java wrapper class from solidity smart contract using truffle

I'm trying to generate java wrapper class of solidity smart contract using truffle but not getting wrapperclass.java file Here is an command which i've used to generate abi/Json of that contract ...
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1answer
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Can i recover ethereum sent to and invalid address? [duplicate]

i've mistakenly pasted "2.5" in address field submitted a withdrawal request. can i get my coins back since the address is an invalid or the coin will be sent? I'm afraid i may loose my coins.
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Is QTUM is a coin or a Token?

According to Etherscan Qtum is a Token, holding supply with verified smart contract. But its official site contains its own protocol and integration mechanism. Is it still a token under ETH or it has ...
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Why am I getting “Invalid number of arguments to Solidity function” on Etherscan?

I'm trying to call a function via the Etherscan UI. I made sure the input data is correct, but I keep getting this error: Invalid number of arguments to Solidity function What's wrong?
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How to transfer ERC20 token from one account to another account but paying the transaction fee from third account?

I want to transfer token from account A to account B by paying transaction fee from account C.I have tried the following logic but token transfer from contract to contract mean contract transfer token ...
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Problem accessing variables stored in event log

I have succesfully implemented an event in my contract Portfolio: // Define eventlog for myEvent event myEvent(uint indexed eventDate, address indexed sender, myArray[] eventList, uint eventBalance); ...
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1answer
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What is the ABI code of a map's getter function?

I'm currently trying to call Etherscan's API eth_call to check data from a smart contract. To do that, I need to pass the function ABI code and data. However, the data I need is stored in a map and I'...
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1answer
35 views

Is Egretia (EGT) is still Ethereum Token? Or It has been moved as a Coin to its own Blockchain?

Currently Egretia (EGT) is represented as a Token of Ethereum Network, but is there any changes regarding shifting from Token to Coin on its own Chain?
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1answer
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Is “geth debug trace_2” on “Etherscan.io” a native geth output?

I am aware of the debug_traceTransaction function. On Etherscan.io there is an option to view transaction, called Geth Debug Trace_2, which produces output in a format that I need. The option is here: ...
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How does getDefaultProvider work in ethers.js?

From the docs: This creates a FallbackProvider backed by multiple backends (INFURA and Etherscan). This is the recommended method of connecting to the Ethereum network if you are not running ...
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1answer
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Event Names not showing up on Etherscan

For some reason Event Names associated with transactions to my contracts aren't being shown in their Event Logs on Etherscan. Worth noting, this event in particular is not indexed. Any thoughts as to ...
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Publish and verify the source contract code in Ethscan. I tried it but it keeps failing. Can anyone help me?

this is the token: MovieMarketCoin https://etherscan.io/token/0xa0005edc8897fe1f9e2705a1682431497a504657 Source code is here: https://github.com/Gh4Algebra/MovieMarketCoin I followed other answers ...
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Can we add custom data in ERC20 token?

Is there any way that we can add hex data in ERC20 transaction? Let s say we want to keep track of why we send the token and other detailed information. How can we achieve that?
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Etherscan API, the input field value of erc20 transactions is always deprecated?

I used to use ABIs to decode the input field of token transactions. I notices recently that the input field has always the value deprecated. You can try the example provided in Etherscan API page: ...
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Verifying a Token Contract with Interface

I managed to deploy a token contract with interface on Kovan Testnet. Now I wanted to verify the code. However this is a bigger problem than I thought. The contract got successfully deployed to: ...
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1answer
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How big is the Geth Fast Node Currently?

I am trying to embark on getting all the contract addresses pulled from the Ethereum blockchain. From what I read, a fast node is all that is required for this (getting blocks->txns->contractAddress ...
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2answers
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Get All Contracts from Blockchain

I am developing a large database of exploitable contract addresses and creating a website to host such a database for users to use to see if contracts are safe. Is there a way to get all contract ...
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1answer
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Verify simple smart contract on etherscan

I'm having trouble with verification of smart contracts and some ERC20 tokens. The only tokens I was able to verify were the ones derived from ERC20Detailed. Here's a simple contract that I found on ...
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I accidentally sent a token to a token contract. Can I get it back? $MWAT [closed]

community! Instead of transferring my ERC20 token $MWAT (RED PLATFORM) to my wallet, I accidentally sent it to the contract itself https://etherscan.io/tx/...
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3answers
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How to get the actual time of occurrence for ethereum transaction in block

I used the API of Ethereum to download some transactions info. The timestamp is included, however I found the timestamp not mean the transaction time but the block which this transaction is located ...
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1answer
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Web3.js is taking lot of time to return a promise

Web3 is taking time near about 5 minutes even after the transaction got 3 confirmations to return a promise from a smart contract which is deployed on kovan testnet. Please give some suggestion how to ...
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1answer
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Is there an API to Download source code of verified smart contracts from etherscan?

There is same question on stackexchange but the answer to that question does not include the new api on etherscan which, given an address as input, allows you to download source code of that verified ...
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2answers
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How to cancel pending transaction of ethereum from exchange wallet? [duplicate]

How to cancel pending transaction of ethereum from exchange wallet? It is pending for around 36 hours now. There is no available tx hash.
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1answer
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What I need to verify contract with open-source license?

i m deployed contract in etherscan mainnet. i m verify it with open-source license like (MIT, GNU). now the problem were i don't know were to define license in etherscan ?? and etherscan will validate ...
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1answer
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Why does etherscan show such unusual results for the creation of this specific contract?

Normally, when I browse for the address of a specific contract and then click the contract-creation transaction label, I get: To: [Contract 0x... Created] For example, consider the BNB contract at ...
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1answer
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Etherscan api for Ropsten testnet

I found this endpoint is to obtain the token balance from Ethereum blockchain, however, I noticed that this function doesn't work on Rospten network. Please advise https://api.etherscan.io/api?module=...
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1answer
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What does this payment fragment mean?

I am trying to comprehend the following snippet of payment code: if (collectedFees >= minFeePayout) { if (!owner.send(collectedFees)) { // Potentially sending ...
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Understanding of this contract with no “funds transfer”

I am learning the functionality of the following contract: https://etherscan.io/address/0xb9955b00fb89456b1a0364cd392e81cd37f6bce8#code To my surprise, while there are some "transfer" statements ...
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1answer
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How to properly write inputs under the multiple transfer (multiTransfer) on the online etherscan form?

Problem: I would like to make a multiple transfer of a token using the web-page: https://etherscan.io/dapp/0x1C95b093d6C236d3EF7c796fE33f9CC6b8606714# To reproduce the issue, click on the "Write ...
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1answer
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How will I determine the number of nodes required to run my private Blockchain Network stable?

I am designing a use case where millions of users will be using it and is expecting a transaction rate of 50 per second. I am looking forward to have it on Azure.
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Why do I get a bad instruction in the transaction?

Here is my withdraw dividend code : function WithdrawDividend(address) public { if (!_RestrictedFromDividend[address(msg.sender)]) { _SavedDividend[msg.sender] = _balances[address(...
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1answer
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Mapping not updating after function is called

After calling this function: function WithdrawDividend(uint256 value) public { require(value <= _balances[msg.sender]); if (_RestrictedFromDividend[address(msg.sender)] <= 0) { ...
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Can we get the number of transaction of a wallet address inside a smart contract? [duplicate]

I am trying to allow only those wallets to interact with my smart contract who have at least some transaction history from past. I am thinking to somehow see the number of transactions the wallet has ...
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2answers
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Mapping not updating?

Here is the function in question : function WithdrawDividend(address, uint256 value) public { require(value <= _balances[msg.sender]); if (!RestrictedFromDividend[msg.sender]) { ...
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Why is my code calculating incorrectly?

My code to calculate the dividend someone is owed is as such : function ViewDividendOwed(address) public view returns (uint256) { if (!RestrictedFromDividend[msg.sender]) { return ...
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1answer
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Why is the holder balance more than total supply? Why has nothing been sent to the contract?

My token is constructed with 100,000,000 supply. Each transaction, 0.007% is burned and a further 0.003% is sent to the contract, making it part of the dividend pool. Here is the transfer function : ...