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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6
votes
1answer
2k views

Etherscan: Effectively paginate `Event Logs` result

I am using Etherscan API for various Ethereum details. I need to find out the tokens transferred from a token original contract (let's say A) address to a particular address(let's say B). For this ...
5
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1answer
614 views

API resource for determining all address holders of a contract

I would like a RESTful API for viewing all addresses which holds a balance of a specific contract. It seems that etherscan.io deprecated this feature, or I'm looking at the wrong endpoints Are there ...
4
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1answer
160 views

Distinguishing erc721 transactions from the response of txlist on etherscan

I am making some erc721 transactions. I can retrieve those transactions using the etherscan api like this https://api.etherscan.io/api?module=contract&action=txlist&address=...
4
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2answers
2k views

Error! Unable to generate Contract ByteCode and ABI

Having issues verifying my token contract on etherscan.io. Receiving the following errors: Note: Contract was created during Txn# Result: Does not match the input creation bytecode found at this ...
4
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0answers
213 views

What is the correct value to report for input data in this context?

On this transaction: https://etherscan.io/tx/0xae2630cdfbd0ca5292d272343c35dc8094365f2ecdc5c262c5639e79683f74dc, the input data is parsed and displayed as 'fund'. This is both correct and incorrect. ...
4
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0answers
953 views

What is the easiest way to view transaction history if a custom token?

What do you think it's the easiest way to view history of transaction for a custom token ? Like A sent X to be B on XX/XX/XXXX. Especially for people who don't know about Ethereum. A tool like ...
3
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0answers
90 views

ENS Name Look Kraken

I'm trying to get the ENS for addresses, so I thought initially to use the ENS on web3 from ens import ENS import web3 as w3 provider = w3.HTTPProvider('https://mainnet.infura.io/v3/...
3
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2answers
416 views

Ether is not reflecting in my Metamask account

My friend has transferred me some ether to my Metamask account but the ether hasn't reflected in my wallet. But in the ether scan, it is showing that my transaction was successful. What can I do to ...
3
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0answers
677 views

How to import contract source code in etherscan.io

I'd like to learn which solidity source code is being used when I create a multisign Wallet in Parity 1.6 My goal is to import that source code into https://kovan.etherscan.io/verifyContract?a=...
3
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0answers
407 views

Can't Verify Contract on etherscan.io or etherchain.org

I've deployed a contract, which I generated using Mist but I can't seem to get it to verify. At etherscan.io I keep getting the error: Error! Invalid constructor arguements provided. Please ...
2
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0answers
68 views
+50

Calculating Ethereum Gas Fees

How are gas fees calculated in account based model coins like ETH? Let's say I own 10 ETH addresses with 0 starting balance. I receive 0.1 ETH payment from 10 people - each one sending a payment of 0....
2
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0answers
58 views

How to get token prices with UNISWAP API

I am using uniswap python api to get live token prices. I am using all the variation of the built-in functions. However, it does not give me the right value. HERE IS MY CODE address = "...
2
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0answers
27 views

How to determine the uniqueness of an internal transaction

How to determine the uniqueness of an internal transaction Example is this transaction: https://rinkeby.etherscan.io/tx/0xc756517a69239bddffe3e0cb07eba98d3ad0fae1b44fc936a0119dbaf7008942#internal ...
2
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0answers
277 views

MetaMask - RPC Error: invalid argument 0: json: cannot unmarshal non-string into Go value of type common.Hash

I am using this code below and I got an error: await web3.eth.getTransactionReceipt(this.state.transactionHash, (err, txReceipt)=>{ console.log(err,txReceipt); this.setState({...
2
votes
1answer
154 views

How to show inventory tab on etherscan

Sorry, i'm newbie about ERC-721. I have deployed my contract and verified it. https://ropsten.etherscan.io/address/0x677f76d276355c382da948d2476da06cf5dc6219 But I don't see inventory tabs like other ...
2
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0answers
41 views

How to verify a contract in etherscan older than 0.4.11?

It seems that the verification feature of Etherscan supports contracts written since Solidity 0.4.11. I want to verify a contract written with Solidity 0.4.8. Is this possible? I'm wondering if this ...
2
votes
1answer
45 views

what is difference in ethereum transaction after constatanople upgrade?

I have heard that Constantinople update transverse the consensus protocol of ethereum from proof of work to proof of stake. So they claimed that this update could speed up the TPS(transaction per ...
2
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0answers
19 views

What is driving occasional drop in number of transaction pending in the last few days?

Anyone can explain any events that trigger a sudden drop in pending transactions occasionally (refer to diagram below)?
2
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0answers
587 views

Error when verifying signed message on Etherscan

Why is it that my message on etherscan can not be verified correctly? I always get this message: I'm sorry! Signature message verification failed
2
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0answers
193 views

What does total number of blocks per day mean in Etherscan?

I tried to figure out what does total number of blocks per day means here and on the Internet, but i failed. For example, the number of blocks on 26 Aug is 5947 [here https://etherscan.io/chart/blocks]...
2
votes
1answer
598 views

How to add website link to erc20 token on etherscan.io

How can we add this official site link to our deployed contract? Like in the image below: Here is my deployed contract address: https://etherscan.io/address/0xab73a739729a21b2299761408507556d2719af89#...
2
votes
1answer
59 views

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 ...
2
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0answers
337 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 ...
2
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0answers
117 views

BI Dashboard (Tableau, Qlikview esque) for Ethereum/Quorum?

Most of the ethereum transaction explorers (etherscan) I have encountered does not have snazzy analytics capabilities. For enterprise, there is a need to analyse (sum, count, etc) the data in the ...
2
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0answers
125 views

Tracking orders on 0x network

How are the various 0x network order trackers sourcing on-chain settlement data? My first assumption was that they were utilising the Etherscan API, however Etherscan have their own tracker, found at ...
2
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0answers
645 views

web3 1.0.0-beta example for etherscan websocket?

Does anyone have a working JS example for wss://socket.etherscan.io/wshandler? Or any alternative websocket providers, besides Infura? The reason I'm looking for Infura alternatives is it fails for ...
2
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0answers
43 views

Is this a bug in Etherscan

This transaction shows that account 0x152ae79400fdeee287849f35e4f687316e27bae6 sent this smart contract 0x14fbca95be7e99c15cc2996c6c9d841e54b79425 a transaction that interally invoked the maker token ...
2
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0answers
300 views

token (deployed by other crowdsale) not showing up on Etherscan

I have a crowdsale that creates a token. The crowdsale shows up on Etherscan and can also be used on MyEtherWallet. I read the token address which gets created by the crowdsale constructor via MEW but ...
2
votes
1answer
224 views

Contract creating other contract doesn't show resulting transaction details on etherescan

Looking for help with a successful transaction not showing the details on etherescan. Having a deployed factory contract like so (simplified): contract EntityFactory { event EntityCreated(...
2
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0answers
534 views

Can not verify a contract on Etherscan (with a library)

I tested my first contract and wanted to verify the contract on etherscan: https://rinkeby.etherscan.io/verifyContract?a=0xc73adf8d3ee480e483f45c9c84ee88269407e95d For some reason I can not verify ...
2
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0answers
71 views

Why are my contracts created from a Factory appearing in etherscan as normal accounts and not contract accounts?

I have a factory on rinkby testnet that creates other contracts. These other contracts are shown as normal human accounts, and not contract accounts. It appears that the code for the factory and ...
2
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0answers
225 views

Strange revert() behavior on Etherscan

I am testing my contract, which is for an auction. I've deployed it on the Rinkeby testnet. I have a payable function that calls revert() if the bid being placed isn't higher than the existing bid. ...
2
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0answers
540 views

How to verify a deployed contract on etherscan

I would love to get some help with this as I'm wracking my brain with how to get this done. I have gone through this link to verify my contract: https://etherscan.io/verifyContract I am puzzled with ...
2
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0answers
286 views

How to find constructor values being passed to a contract

I'd like to find out which values were passed in when someone deployed a CrowdSale token. Is there a way to find out. Here is Lunyr Crowdsale contract How would I find out which values they passed ...
2
votes
1answer
105 views

Why do compiler version and version in the source code not fit together for some verified contracts on Etherscan?

I found this verified contract on Etherscan: https://etherscan.io/address/0xd7a27d8d58f0c9e378fb3cb2816bde94c5e34059#code Etherscan says, it was compiled with solc version v0.4.14+commit.c2215d46, ...
1
vote
1answer
545 views

Fail with error 'TransferHelper: TRANSFER_FROM_FAILED' By calling UniswapV2Router02 swapExactTokensForETH

I am trying to call UniswapV2Router02 swapExactTokensForETH function on my Solidity Contract. I got Fail with error 'TransferHelper: TRANSFER_FROM_FAILED' on etherscan. this is transaction url : ...
1
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0answers
28 views

Is there any alternative to string[]?

I need to store a number 4D security hashes. For example: CCHdU3mFEYPpa-CYeDSooeZtYSG-CD9czobepa4a9-CRmVpX3Tegakr I am storing number of these hashes in array of string i.e. string[] using pragma ...
1
vote
1answer
29 views

Events declared in library are missed in contract ABI

DYDX contract SoloMargin is firing events like LogTrade, LogSell but they are not provided in ABI. SoloMargin contract: https://etherscan.io/address/0x1e0447b19bb6ecfdae1e4ae1694b0c3659614e4e#code ...
1
vote
1answer
290 views

Sweeping ETH from a 2 year old paper wallet, help?

I have a paper wallet from an ETH atm from 2 years ago. I am trying to sweep the funds onto a digital wallet. I have used multiple ETH wallet apps on my phone but none of them were able to recognize ...
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0answers
13 views

How to judge whether a reentrancy attack is successful when reproducing the attack in private chain with Remix?

I reproduce the attack using the same codes successfully in Javascript VM of Remix, there are events in logs. But when I reproduce it in private chain, there are nothing. I cannot judge whether the ...
1
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1answer
392 views

What to do if Metamask doesn't show a deposit because it's an “internal transaction”?

This is a follow-up on the question "Do all transactions show in Metamask wallet?" from Sky Hayward, in which Sky asked about transactions that show up as successful on etherscan, yet the ...
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0answers
17 views

Getting name/decemals of unstandardized token on Ethereum blockchain with web3.js

I understand how to call methods of name/symbol or decemals on ERC-20 tokens but what about tokens that do not have such.. for example this token here https://etherscan.io/token/...
1
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1answer
229 views

ENS on Rinkeby - Network does not support ENS?

I was able to register the ENS domain on Rinkeby, as the network supports ENS. My TX: https://rinkeby.etherscan.io/tx/0xd42b64ab03387d7ca405e7ba7b85ce893444a141e7a7de174f0361e2c4231674 My subdomain: ...
1
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0answers
12 views

Setting up listener using web3py

I'm setting up a proof of work contract. When a solution is found, the contract emits a Transfer event and the number that gets hashed with future solutions changes. I need to set up a listener so ...
1
vote
1answer
89 views

What do the Type Trace Addresses on the Internal Transactions Section of Etherscan mean?

I am seeking to better understand the bZx exploit by following the Internal Transaction section of the exploit transaction on Etherscan click here to view. I am confused about what the Type Trace ...
1
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0answers
25 views

Is there a tool that generates a PDF version of a transaction?

Etherscan provides a nice UI for viewing what happened in an Ethereum transaction, including internal contract state updates. Is there a tool or an API that takes an Etherscan link, or an Ethereum ...
1
vote
1answer
39 views

Watching for events

How come sometimes events show up on block explorers in hex and sometimes to you can see the actual string name of the event in the logs. I ask because my event watchers on my front end only pick up ...
1
vote
1answer
59 views

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: '...
1
vote
1answer
54 views

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?
1
vote
1answer
111 views

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 ...