Questions tagged [verify]

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Contract in bsctestnet cannot be verified

I tried to deploy my tokens on BSC testnet using remix. But I always get an error when I verify. I tried a lot of methods, but still no solution. In fact the generated Bytecodes are not wrong, but I ...
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35 views

Error! Invalid constructor arguments provided. Please verify that they are in ABI-encoded format

Update: so these 2 lines in my code seem to be causing the problem and removing them got everything to work but I still need to include them so if someone can figure out why they are breaking that ...
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How to verify a “ERC20PresetFixedSupply” OpenZepplin contract on Etherscan?

I have deployed a contract through Remix to the mainnet and I am now having issues with verifying the contract. When I compiled it I used the 0.8.0 compiler without optimization. The contract I used ...
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Having trouble converting json to abi encoding

I'm trying to convert the following json to abi code using https://abi.hashex.org/ [ { "inputs": [ { "internalType": "string", "...
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Verify smart contract from Python fails because of Cloudflare

I am trying to verify a smart contract in Ropsten automatically with Python but Cloudflare is blocking me (I get a 403 asking me to complete a Captcha). Is there a way to bypass this? url = 'https://...
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1answer
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Does verification of a world state require downloading the whole ethereum blockchain?

Lets say I'm a new node on the Ethereum network, I download a world state of 500 blocks ago and I download the blockchain from that point to present (500 blocks). Can I verify that the world state I'...
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22 views

Decoding signature for verification not working

I'm trying to verify a signature, but when I decode it, the function reverts. This is the function I'm using function source(bytes memory signature) public returns (bytes32 r, bytes32 s, uint8 v) { ...
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1answer
14 views

Specific account validating transaction

I am trying to create a system using blockchain for a "firm". What I am looking to do is for an employee to enter some data into the system but before it is uploaded have a manager sign off ...
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1answer
39 views

How To Verify A Coin Without Original Contract Source Code?

We are new to crypto. A while ago we created a coin (3DOM coin) with 14,000,000,000 units and stored them in our wallet on myetherwallet.com. We would like to deploy the token now but we do not have ...
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1answer
17 views

Different byteCode generated between block explorer and standard json input

I have deployed a contract and want to verify it, but when I used the same code with same configurations of compiler to verify it, it gave me negative result. Thus I tried to decompile these two ...
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8 views

When the ETH node receive a new block ,which will be verified?

I know that when a node receives a transaction, it can verify the RLP format, transaction signature, gas and account nonce value, but I don't know when the node receives a new block, whether will it ...
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Getting a weird error trying to verify a smart contract through hardhat [duplicate]

I am trying to verify on hardhat this nft-tutorial by chainlink https://blog.chain.link/build-deploy-and-sell-your-own-dynamic-nft/ but am unable to. What might be the problem? is it my syntax? Or ...
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45 views

Truffle-plugin-verify says passed but still unverified on BSCscan

Contracts deployed via Truffle are not properly verifying on the mainnet. On my end it says verification passed but on the website it's still unverified. I've been able to deploy and verify the same ...
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11 views

Distribution of mined Blocks, its verification and the Longest Chain Rule

Hi all I am in need of a clear understanding of the distribution of mined blocks, the verification mechanism and the longest chain rule. How is a freshly new mined Block being distributed to the ...
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1answer
66 views

Cannot verify Contract - bytecode has small difference

I forgot to verify the ERC20 token contract after deploying it. Now after 5 months, Im doing it again and completely forget which compiler and if I accidently change anything on the code. After ...
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Verify & Publish Source Code

I tried to Verify & Publish Contract Source Code for my token and the error happened like this Compiler debug log: Error! Unable to generate Contract ByteCode and ABI (Compiler Exception) For ...
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125 views

Verifying ethereum message signatures with java

I am using web3j to verify message signatures but there are some false negative results. For example this signature should be right, but it seems like the address could not be recovered: final ...
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21 views

How to validate a BTC transaction in an Ethereum smart contract?

Can an Ethereum smart contract use SPV to validate a BTC or BCH transaction? If so, are there any functioning libraries? What are the drawbacks or challenges when doing so?
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1answer
64 views

Do miners have to verify blocks?

I want to know whether the bottom layer of Ethereum requires miners to verify blocks? The reason for this problem is that I have been thinking about a scenario of blockchain transaction verification ...
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What exactly does the miner verify in the process of verifying the transaction?

I have seen different answers to this question. For example, one transaction calls a function on a smart contract. Some people say that the miner uses the same input to verify that the output is the ...
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1answer
39 views

Why miners choose to verify the transactions of the incoming block?

I want to know whether miners can get rewards for verifying transactions in blocks broadcast by other nodes? If there is no reward, why would miners choose to verify transactions? I am very confused ...
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1answer
136 views

Can miners choose not to verify transactions in blocks broadcast by other nodes?

When we execute a function on a smart contract, the transaction will be verified by all miners in the entire network before being written to the blockchain. I want to know no matter how complicated ...
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1answer
21 views

When we get the execution result of the smart contract, has this result been verified by the entire network?

When we get the execution result of a function in the smart contract, has this result been verified by the entire network? In other words, when the user obtains the execution result of the smart ...
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1answer
41 views

The authenticity of msg.sender variable in smart contract

We know that in a smart contract, msg.sender can be used to obtain the address of the user calling the contract. Is it possible for users to forge their own account addresses, causing the msg.sender ...
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How do two parties verify a transaction initially?

Sorry for the beginner question. Im trying to understand how a blockchain transaction is initially verified by both parties. I think I understand the process of externally verifying a transaction but ...
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48 views

Problem Uploading Contract Verification to Etherscan - Contract works perfectly and is already deployed

BOUNTY WILL BE GIVEN FOR SOLUTION I am having trouble authenticating my ERC-20 Token Contract on Etherscan. Token works perfectly and all functions are correct I am a novice dev and lead dev of ...
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2answers
66 views

How to publish in ethereum with “imports” ? or how to do?

Hello i have this question in my mind now : How to publish in ethereum with "imports" ? or how to do ? why i say this ? answer : when i wanna "verify and publish Contract Source Code" with a ...
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1answer
46 views

Besides Etherscan, Are There Other Places to Verify/Publish Contract Code?

The title says it, but I also need at least 30 characters.
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2answers
192 views

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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2answers
188 views

ParserError: Expected pragma, import directive or contract /interface/library definition

In an attempt to compile my ABI and verify my contract, I am getting the following warning: "ParserError: Expected pragma, import directive or contract /interface/library definition" on the first line ...
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2answers
455 views

ecrecover() always returns 0x0000000000000000000000000000000000000000

I'm aware of these posts How do you sign an verify a message in javascript proving you own an Ethereum address? How does one properly use ecrecover to verify Ethereum signatures? I'd like to sign a ...
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1answer
293 views

How can I verify that two specific wallet addresses were involved in a transaction?

Given I have and know WalletAddress A (sender), WalletAddress B (receiver), the Transaction Hash and the amount ETH sent. How can I verify that those values were indeed involved in the given ...
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Does a verified deployer contract implies that it's child token contract is also verified upon creation? [duplicate]

Token address: https://etherscan.io/token/0x12b19d3e2ccc14da04fae33e63652ce469b3f2fd Contract address: https://etherscan.io/address/0x12b19d3e2ccc14da04fae33e63652ce469b3f2fd Deployer contract: ...
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1answer
92 views

Is a contract verified and safe if it's created by a verified contract?

The contract source code is not verified as you can see in the picture, but the contract was created by another contract code which is verified. Does that mean that the contract code from the picture ...
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2answers
197 views

verify and publish when using oraclize?

I'm using oraclize in my contract. import "github.com/oraclize/ethereum-api/oraclizeAPI.sol"; When I go to verify and publish on etherscan I get this error myc:4:1: ParserError: Source "github.com/...
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2k views

Check if a struct is empty

I have a function where I pass a id. With that id the contract find in a mapping a struct. My idea is to check if exists that struct with the given id with a if clause. I try with 0, null, "". Is ...
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1answer
133 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, ...
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2answers
67 views

Why ethereum dons't store transaction signature? [duplicate]

Ethereum doesn't store transaction signature (r,s,v) in its tries. The first answer in that it is state-based, not UTXO based: Retrieve the signature of a transaction on the blockchain But there is ...
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1answer
64 views

Does a non-miner node validate both single transactions and an entire block?

My understanding is that an originating node broadcasts a transaction to its neighbours, who all validate the transaction to ensure (a) the signature is valid and (b) the state change is valid, before ...
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1answer
50 views

Is there a more “decentralized” way to verify an Ethereum account owns a particular Twitter handle?

Is this something fulfilled by a project like uPort? Basically, I need a way in my contracts to verify that a particular Ethereum address (0xasdf...) and a particular Twitter handle (@user) are ...
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1answer
63 views

How to verify crowdsale contract on etherscan

I'm deployed a crowdsale contract how to verify my contract on etherscan.io
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1answer
243 views

How geth verify the rewards for miner in ethereum?

In the Finalize() function of ethash consensus, the rewards to miner and uncles are given by directly state.AddBalance(). where I can validate the rewards? I guess there are two places 1)...
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1answer
2k views

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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122 views

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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381 views

How to verify a contract with libraries deployed from Remix

I successfully deployed a contract with remix here on Ropsten Testnet: https://ropsten.etherscan.io/address/0x10273a926517b417015748da21e1287bab2da8f7 The Source Code is very simple but I'm using my ...
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1answer
111 views

Help verifying a contract

I'm having a tough time to verify a contract. This is the contract ABI of the contract that I've deployed: [ { "anonymous": false, "inputs": [ { "...
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1answer
73 views

Looking for good guide on how to deploy and verify source code of Smart Contract using Truffle/Remix

Can't really find good guides on how to deploy and verify smart contracts to testnetwork Ropsten. Would like to deploy multifile smart contracts including libraries. Are there any good HowTos already? ...
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1k views

Can ZKSnarks be implemented on the Ethereum ecosystem?

Since Zcash seems to have it's ZKSnarks implementation finished (or almost at least). And versions of JPMorgan's Quorum had appeared with ZKsnarks implementations included see: https://www.coindesk....
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1answer
446 views

Miner and Validator, who can validate a contract?

I am still confused with the process from creation to validation of transaction or contract verification. Actually the terminology makes me confused such as voter, validation, miner, honest node, ...
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1answer
175 views

Failed to verify contract source code due to timeout/memory limit

Failed to verify contract deployed through remix on Ropsten network both using optimization and without it. Error is: Exception #1 Occured: ERROR|The Contract solidity compilation has exceeded the ...