Questions tagged [verify]

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2answers
31 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
41 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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0answers
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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
41 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
70 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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0answers
248 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 ...
2
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1answer
83 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
35 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 ...
1
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1answer
26 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 ...
0
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1answer
33 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 ...
2
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1answer
42 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
92 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
302 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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0answers
91 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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0answers
179 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 ...
1
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1answer
77 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": [ { "...
1
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1answer
43 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? ...
9
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3answers
959 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....
1
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1answer
279 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
152 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 ...
0
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1answer
154 views

Verify Contract Code Eth

I'm trying to verify an erc20 Contract code for a few days. I have read a lot and tried but just can not get on. maybe someone can help me? Here are the dates: /* Implements EIP20 token standard: ...
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0answers
151 views

verifying code deployed with web3.js

I am deploying my smart contracts using web3.js and compiling the code using solc. The contracts are deployed successfully with no issues however I am having a bit of a problem in verifying my ...
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0answers
962 views

Why the value of v is always either 27 (11011) or 28 (11100)?

Why the value of v is always either 27 (11011) or 28 (11100), and, how is it known wether it will be 27 or 28?
4
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2answers
445 views

Possible to change Etherscan verified source after initially verified? [closed]

Is it possible to change the comments in verified contract source on Etherscan once the contract source has already been verified? It isn't the Solidity source itself that I'd like to change. Just a ...
1
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2answers
463 views

Why doesn't my verification of a signed message signature work in PHP?

I am attempting to verify a signed message in PHP. To be clear, I am not looking to interface with JSON-RPC or any external service, which I both a) know works and b) successfully verifies the ...
0
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2answers
629 views

How can I use geth's ecRecover to verify a signed message from TREZOR?

I cannot get this to work. I understand from this that TREZOR adds the magic message and a hexadecimal message length (as opposed to ASCII length) of the message before signing. Is it just not ...
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1answer
463 views

Unable to verify contract: Unable to generate Contact ByteCode and ABI [duplicate]

https://etherscan.io/tx/0xc881a7d4f5b0ee3ea12884d28e9af3a2ee8e69c24f89057096a9b78aaa35b590 This is the code pragma solidity ^0.4.18; /** * @title SafeMath * @dev Math operations with safety ...
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4answers
709 views

I can't verify my contract on the Rinkeby etherscan site

I'm getting the following error when verifying on the RINKEBY etherscan site: Error! Unable to verify source code Exception #1 Occured: ERROR|The Contract solidity compilation has exceeded the ...
0
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1answer
370 views

Unable to verify contract on Etherscan Rinkeby Testnet

I am unable to verify the smart contract on Rinkeby testnet. I have deployed the code through truffle and developed using open-zeppelin. I have tried to look for solutions on this platform and I tried ...
1
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2answers
504 views

How to find input creation byte code for constructor argument?

I want to verify and publish my solidity source code on Etherscan.io. My smart contract has an argument in it's constructor for which I need to fill a field in the form that takes Constructor ...
0
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1answer
369 views

ABI for Etherscan verification

How I can get ABI in multiple contract code? if the code is here: Token address is: 0x4960a0Db832c3Bb503F3Da59a274D9385e0Ade5A Crowdsale contract: 0x7a76d1A86a8b801865eC9134552904366b327A45 I ...
10
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3answers
2k views

How do you verify a contract on etherscan that is deployed by another contract?

How do you properly verify a contract on etherscan that is deployed by another contact? I deployed a contract that deploys other contracts onto the blockchain. The original contract is verified , ...
6
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1answer
3k views

Unable to verify Solidity contract code on etherscan.io

I know this question has been asked many times before. I've read loads of answers, but nothing seems to work for me. I first tried to verify the source code of a much larger, more complex contract, ...
1
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1answer
1k views

How to verify a contract having constructor arguments?

This is a contract that requires an argument to be deployed. The Contract Name is "Asset". The compiler used is "Compiler 0.4.16+commit.d7661dd9.Emscripten.clang" and Optimization was Disabled. To ...
4
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1answer
531 views

Is there a way to verify the identity of the sender of the transaction in ethereum?

Is there a way to verify the identity of the sender of the transaction in ethereum? Like we have certificates issued by certificate authority do we have similar thing for the accounts on blockchain
2
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1answer
147 views

How does Ethereum know that I have enough ETH to spend?

Ethereum uses account-based model. It means that if account A has 50 ETH and sends 10 ETH to account B, transaction will look like "send 10 ETH from A to B" (no inputs and outputs as in UTXO). With ...
2
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1answer
56 views

Is difference between light_verify and verify just DAG size?

I am looking at this doc: https://github.com/ethereum/wiki/blob/master/Dagger-Hashimoto.md And from what I gather, light_verify uses quick_hashimoto which calculates the DAG using a recursive ...
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0answers
32 views

Verify Signature in JS Console [duplicate]

In the geth console: eth.sign(eth.accounts[0],web3.sha3('yesyesyall')) Returns: "...
1
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1answer
531 views

failure to verify truffle compiled contract on ropsten.etherscan.io

Recently just pushed my first smart contract from truffle to the ropsten testnet. As you can see from my terminal output below it compiles and was migrated with no problem: Was broadcast to the ...
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0answers
525 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 ...
10
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3answers
6k views

Convert contract arguments from JSON to ABI-encoded format

I want to verify a contract code on Etherscan, but don't know how to get the arguments in ABI-encoded format. I have the source code and the interface in JSON. Is there some tool I can use, or some ...
3
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2answers
2k views

How do I create ABI encoded constructor argument to verify an Ehtereum contract on etherscan.io when i know the arguments: adress1 uint

I have a contract: https://github.com/slavik0329/BetterAuction that i want to verify here: https://etherscan.io/verifyContract?a=0x3e7a000DC9FE17424cBA7E5bB21390A87a8e32d6 the arguments are: ...
14
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2answers
2k views

Etherscan: How can I verify a contract with multiple imports deployed with Truffle?

When I deploy a contract with Truffle that has an import statement, and try to verify it on etherscan, my understanding is that I need to paste in the contents of the imported file. I get an error on ...
6
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3answers
2k views

Cannot verify contract with multiple arguments at etherscan.io

When I enter all the information about a contract, the system displays the error: Error! Invalid constructor arguments provided. Please verify that they are in ABI-encoded format I fill in the ...
0
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2answers
170 views

Verifying the authenticity of a customer

One of the strengths of blockchain, and specificallly, Ethereum, is the ability to have a complete record of customer orders from customer setup (for new customers) to customer delivery of goods. I ...
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3answers
1k views

Can't verify contract on etherscan.io

guys. I have created simple contract, migrated to testnet via truffle. It can be founded here. But I can't verify it. I double check: 1. name of contract 2. version of compiler (ver. 0.4.11 in ...
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1answer
1k views

what does verifying smart contract execution means?

I know that when somebody wants to run a function in a contract, she sends a transaction; and then a miner needs to run that function based on the function input received from the user, adding the ...
1
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1answer
659 views

Is it possible to verify a given `block hash` is valid in a contract?

Inside my contract, I want to verify a given block hash is valid or not. block_hash_validation(string blockhash) returns (bool){ ...//check() return true; || return false; } Q1: If yes, from ...
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1answer
580 views

How are the blocks traversed?

How are the blocks traversed? Is it using a linked list concept to traverse? If I need to see all block details, will it traverse from the genesis block to the requested block or will it traverse ...
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0answers
379 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 ...