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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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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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?

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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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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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 : ...
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How do I change where a function appears in etherscan?

I have two functions which are in places I don't want them to be. The first is a readme function, which simply returns a string for people to read. I put it at the top of my code, and I hoped it ...
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Auto-Response smart contract [closed]

I would like to make a smart contract that can auto-respond.. Something like an email auto-responder. A user sends a transaction with a message to the smart contract, and if that message is ' True' , ...
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ERC-20 Token Transfer Error (Unable to locate Corresponding Transfer Event Logs), Check with Sender

EtherScan.io is showing error: The ERC-20 Token Transfer might have Failed (ErrCode: unable to locate corresponding Transfer event log), check with sender. Transactions are successful and the ...
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Troubleshooting a revert on Ropsten

I’ve deployed a contract to Ropsten and am testing it manually with Remix. This transaction reverts for whatever reason (we have unit tests where everything looks fine). In our contract for all of ...
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cannot verify the contract address because of compiler version 0.4.9 not available in etherscan verify contract

My compiler version is solidity 0.4.9, but i am not able to verify my contract address on etherscan verify contract, the reason is 0.4.9 is not in the list compilers...please tell me the solution to ...
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Ethereum fast sync and wallet balance?

I'm planning to run a Ethereum server for getting wallet balances at a specific time, which type of node should i run, fast sync will work ? or should i go for archive node ?
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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 ...
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What is the current distribution of ERC Token Standards in the top 100-1000 most active token contracts?

From ERC 677 Motivation ERC20 requires a multistep process for tokens to be transferred to a contract. First approvemust be called on the token contract, enabling the contract to withdraw the ...
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ERC721, Token name and symbol not shown in etherscan

I have created a simple token with ERC721, but etherscan not show my token name and symbol, why? this is my contract I deploy with this code Result on etherscan No token name and symbol showed, is ...
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I've given Gwei less than 0.1 for a transaction, and it's been an hour, and it is not showing up in etherscan!

I know I pretty much messed up with Gwei, I've given it < 0.1. My doubt is if the transaction gets failed will the funds get back to my wallet or lost forever and how much time will it take for the ...
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Dates of ERC20 tokens transactions

I'm an individual who is interested to ICOs which are selling ERC20 tokens. My question is related to an issue that, for most of the ERC20 tokens, the dates of transactions do not fall within the ICO ...
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Is there any way to hide or encryt input data that sent to smartcontract? [duplicate]

After a While working with ethereum, I felt ethereum is not only public and also naked because whatever input data that we sent to contract function, it is visible to everyone when looked into the ...
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Help with ERC20 Contract

I sent tokens to my contract address instead of to my myetherwallet address from an address that the tokens were previously sent some time ago. Now I have no access to the amount sent to this address. ...
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how do etherscan get all the token balance of particular address?

I want to create service where just by providing address i can fetch all the token (erc 20 & erc721) balance just like etherscan for a private network? is there any way to do it by writing for ...
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My wallet got hacked - I do not know what do to

Someone hacked my eth wallet and when ever I deposit ethereum to the wallet my deposited ethereum is sent directly to his wallet automatically.. Pls how can I stop this issue because my wallet has my ...
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filter blocks by time range on https://etherscan.io/

Could you please tell me how I can filter the blocks by its created time on https://etherscan.io/? For example, if I want to find all blocks that were created between May-22-2019 04:50:00 AM +UTC and ...
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etherscan verification problem

For some purpose. I use web3.js 0.20 to deploy contracts.(eg. press button to deploy contracts automatically, not through remix IDE). When I deploy contracts, etherscan need to verify solidity. Is ...
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Looking for api call to send ERC20 token over eth-wallet

I use metamask and etherscan api to get the info when a specific ERC-20 token is sent to my wallet. I would like to use API to send a specific ERC-20 token back to a given public key over API from ...
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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 ...
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Could we know if an address contains a specific token via Etherscan API?

I tried this, http://api.etherscan.io/api?module=account&action=txlistinternal&address=0x2c1ba59d6f58433fb1eaee7d20b26ed83bda51a3&startblock=0&endblock=2702578&sort=asc&apikey=...
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Etherscan API call at specific block number

I'm trying to use Etherscan API to call a specific method from smart contract, however, i cannot call at specific block number. For example: This is the API: https://api.etherscan.io/api?module=...
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problem displaying ico

I created an ICO using ropsten (because I did not have an ETH) and when I search for my ICO on https://etherscan.io, I cannot find it. I can only find it here: https://ropsten.etherscan.io. Is it ...
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Is it possible to find a specific statistic for each token?

I'm trying to create some sort of statistic generator related to ERC20s. Let's assume you have 10,000 Token A. I would like to tell users something like: "better than 0.5% of the accounts". Basically ...
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manipulate transaction input data via web3

When sending ETH to another address via metamask, I confirmed that I can also send input data. For example, 0x7465737420746573742074657374 But I also want to know if it's possible to manipulate input ...
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why do i see input data in the transaction details when i didn't pass it as a data parameter

When I create a transaction like below App.contracts.Soccer.deployed().then(function(instance) { return instance.purchaseShoes(name, age, { from: accounts[0], value: value}); }).then(...
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Etherscan apikey error in laravel

Etherscan apikey returns an error This is my code: namespace App\Http\Controllers; use Illuminate\Http\Request; use App\Models\AdminSettings; use App\Models\User; use Auth; define('APIURL', 'http:/...
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Etherscan how to get latest transactions?

I am using this api to get all transactions at an address, however I see it returns the last 1000 transactions, is there any way to make it return first 1000 transactions by date?
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Problem in contract verification through EtherScan API

Contract source verification through these APIs is putting it 'pending in queue' and not getting confirmed. This interface is also behaving same. I tried it with rinkeby and kovan. Here it works ...
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How to retrieve “contract creation transaction” info for a particular contract using Etherscan API?

Assume i have the address of a contract, and now i would like to retrieve the information for its creation transaction. I used getCode(), but return bytecode for the contract, which is different. If i ...
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Can I get the timestamp for a transaction added to mempool?

Can I get the time stamp on when a transaction was added to the mempool and when it was successfully added to a block? Is there an API to do this?
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Fetching a snapshot of all the contracts accessible on Etherscan

I am trying to collect a large set of online contracts and came across the following statement in a research article: Does anyone know how to access such a "snapshot of 25983 contracts"? Is it ...
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I found 4 very similar wallet addresses. How is this possible?

These are the addresses: 0x7cB57B5A97Eabe94205c07890BE3C1aD31E486A8 0x7Cb57B5a97EaBe94205c07890bE4C1aD31E456a8 0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8 0x7CB57b5A97eabe94205C07890beaC1aD31E486a8 ...
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Warning: The compiled contract might be susceptible to ABIEncoderV2PackedStorage (low-severity) Solidity Compiler Bugs

This Etherscan.io gives this warning when compiled contract with solidity compiler version 0.5.5 I am sure that is low severity issue and might not apply to our use-case, but I could not find any ...
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Etherscan.io How does it get the exchange wallet address for these token addresses?

Etherscan.io How does it get the exchange wallet address for these token addresses?
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Set Price for ERC20 Token [closed]

I have an ERC20 Token that i have deployed and now have transferred it to about 100 addresses. Now the price shown on my Etherscan for my token is $0.00. When i search through the top ERC20token like ...
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what is the role of merkle tree in ethereum? [duplicate]

I know the functionality of merkle tree, it makes a root hash from a group of data.My question is how merkle tree is act in ethereum blockchain,precisesly in the place of transaction hash,block hash,...
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My friend sent me a screenshot of a transaction hash, but when I search for it I find divergent data. What happened?

This is the transaction hash: 0x90e923ee01d9dfeb95ee176819eeec67d247fc6cb009c8cdc4d8ae1939e5ecc6 And this is the screenshot my friend sent me: If you check the hash in Etherscan, some informations ...
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How can an address on Etherscan have a balance of 0 ETH when I don't see any outgoing transactions?

I don't know why balance of the address is 0.
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Is there any case when the only transaction in Ethercan is IN, but Balance is 0 Ether?

The address that received only a hundred orders of deposit shows in zero balance. I understand when using wallet on the exchange, that should have one transaction that corresponds to OUT. But there ...
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Can't see the source code with the new Etherscan user interface?

everyone! A few days ago, Etherscan has updated their user interface - and now I have no idea, how to get the verified contract's source. Before it was located no the #readContract tab, but now there'...
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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 ...
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scatter confirmation for sign a transaction?

I have built an dapp. It's almost like twitter where the user can tweet and also use as a microblogging site in blockchain.I have used scatter as transaction signer for using my dapp. The real problem ...