Questions tagged [signature]
The signature tag has no usage guidance.
281
questions
0
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1answer
25 views
A silly question about web3.eth.sign
I'm a beginner and I need to sign the data with metamask，Find the document https://learnblockchain.cn/docs/web3js-0.2x/web3.eth.html#sign
then In the browser's debug desk ，i try run
web3.eth.sign('...
0
votes
1answer
16 views
Keccak256 hash different in solidity and web3js
I am trying to sign a message in NodeJS and verify the signature with smart contract. Here is my code:
async function prepareAndSignMessage(to, amount, referenceTransaction){
let contractInstance =...
1
vote
1answer
17 views
Invoke Metamask with a pure JS/HTML set up
I am new to front end Web3 and I am trying to have a simple SIGN button that will invoke metamask to sign a "Message". I can't seem to get it working. I am using pure HTML/JS without any ...
0
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0answers
13 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 ...
0
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0answers
16 views
What is the length of an signed transaction ? ( to be sent by method eth_sendRawTransaction )
I have spent days on signing a raw transaction, but all are failed.
Now I want to know, what is the length of a raw transaction? and can you give me an real example of a signed transaction?
For ...
0
votes
1answer
22 views
Cannot sign data using eth_signTypedData_v3 in coinbase wallet but can in every other dapp wallet?
Signing data worked in trustwallet, metamask, opera wallet. But not in coinbase using walletlink.
Using eth_signTypedData_v3 - when sent to coinbase wallet via walletlink the error Cannot read ...
0
votes
1answer
28 views
How to extract signature from web3.eth.sign or web3.personal.sign
In React Typescript (.tsx file), I'm trying to use web3.eth.sign to validate an account. The signature is being generated properly, but I can't seem to get the signature out of the callback function.
...
0
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1answer
18 views
How a smart contract retrieves information from signed message in solidity?
A dapp can sign a message with the web3.js:
// recipient is the address that should be paid.
// amount, in wei, specifies how much ether should be sent.
// nonce can be any unique number, used to ...
1
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0answers
15 views
Encoding and signing transaction with aleth client [closed]
I am learning aleth client. I want to do two simple steps:
encode json to rlp with ./rlp create [...]
sign this rlp with ./aleth-key sign <ma_rlp>
And I am getting errors in ./aleth-key sign &...
3
votes
1answer
35 views
Do miners undergo a sunken cost of attempting to verify an invalid transaction signature?
In the case of an 'invalid' transaction whereby the state transition of the execution is deemed to conflict in some way and reverts, the transaction itself is actually valid; gas is consumed, tx ...
0
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0answers
18 views
How does ecrecover get compiled?
How does ecrecover() in solidity work? Looking at ethervm.io there doesn't seem to be an opcode for ecrecover? To what bytes is a ecrecover() call compiled?
0
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0answers
22 views
Does the EVM have an opcode to check private key signatures?
I have plain and simple desire. I want my dapp users to be able to generate some data payload, sign it with their private key, and send it using any external channel (eg JSON between apps) to a ...
1
vote
2answers
75 views
Multi-signature contract with offline signing
Is it possible to create a multi-signature contract that would not require a transaction for every signature (since this is quite expensive for a higher number of transactions)?
Is it possible to ...
0
votes
1answer
72 views
ethers.js wrong signature
From the same private key in ethers.js and secp256k1 I get the same eth address. But if I sign a message I get a different (wrong) signature in ethers.js. What is wrong with my code?
import { ...
0
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1answer
34 views
EcRecover signed message does not match PublicAddress
I am trying to create a C# webservice back end API that handles the code logic found in Step #5 here:
https://www.toptal.com/ethereum/one-click-login-flows-a-metamask-tutorial
Their code looks like ...
0
votes
1answer
17 views
Do smart contract transactions get signed?
When you send a transaction to a smart contract by using the contract.methods.methodName().send() is it signed by the sender? If not how can I link the sender to that transaction call
1
vote
1answer
78 views
Recovered address not matching signer address (using ethers)
Below is a simple signature verification flow I wrote, along with a test case with Buidler (all mainly to learn how to verify signatures in a Solidity smart contract). The problem is that the address ...
3
votes
1answer
46 views
Create signed message without JSON RPC node in PHP
I am trying to recreate effect of web3's eth.accounts.sign in PHP and I struggle to find good resources how to do it properly.
I have seen this
(found it thanks to this thread) and based on what I ...
2
votes
0answers
21 views
Why does clef not implement ethereum's JSON-RPC
Assuming that the RPC standard still matches what is to be found today on the ethereum wiki, I was rather surprised to learn that the method calls provided by clef do not match the signer methods in ...
0
votes
2answers
48 views
Offline creation of signed contract transactions with web3js v1.2.11
I'm attempting to sign a contract transaction offline using web3js v1.2.11.
signingAddr = //my eth address
signingPk = //my private key
// docs: The options object for the contract instance. from, ...
0
votes
0answers
22 views
Signing text with special UTF8 characters browser vs node web3js
I am attempting to get consistent signatures / recovery for text containing special characters.
For example, the bitcoin symbol U+20BF, ₿
Junk address and private key:
...
0
votes
1answer
71 views
Signing a request with a signature gives the wrong from address
I am using ethers to get a signed request. I have a signature for the address 0x518171C334AD3adc1cF990A884D67963201B675F.
It is, ...
0
votes
1answer
50 views
What is the equivalent of “buildTransaction” of web3Py in web3JS?
I'm using Node to interact with my smart contract. I understand that I need to first sign my transaction before sending it.
In one of the StackExchange answers I see that it can be done using ...
1
vote
1answer
27 views
Does the term “Ethereum ECDSA signature” have a consistent meaning?
If you were writing some instructions and one of them was:
Provide the Ethereum ECDSA signature of the file using the person's
Ethereum address.
Would the above instruction have a consistent meaning ...
2
votes
1answer
91 views
Signing a message to sell NFT/token - what happens if you transfer the NFT later?
If you sign a message with intent to list an NFT/token for sale - how does that work if you transfer the item later?
For example on an NFT marketplace - you list your NFT for sale by signing a message....
0
votes
2answers
48 views
Signature test failed at Truffle js
I'm trying to test validAddress function from my contract ValidationUser, using truffle and test with JS. I checked the V value from the signature and its 27,28 so it is not the problem.
Also, I have ...
3
votes
1answer
49 views
Ethereum Signing using HSM
I tried signing a Message using the SHA256withECDSA algorithm . It gives a different signed(r,s) output everytime. When i try to recover the address using the ecrevover method .it gives me a different ...
0
votes
1answer
39 views
signing transaction in web3 is not returning msgHash
I am trying to write provble_transfer where owner can pay gas fee for the transaction. Below is the code for signing transaction to my test contact.
let rawTransaction = {
'from': ...
1
vote
1answer
74 views
Signing a raw transaction, wrong R and S values
I am trying to sign a raw transaction in javascript without relying on dependencies like web3, ethereumjs, etc.
I am following the python tutorial found here, and porting to JS as I go: https://...
0
votes
1answer
48 views
Is it best practice to check signature malleability in ecrecover
I am wondering if it is considered best practice to guard against signature malleability to check against the half curve order like this or if this is totally unnecessary.
uint256 constant ...
1
vote
1answer
43 views
Verifying Signatures from other ECC Curves with ecRecover
My Question is, can I verify a ECDSA Signature from a different ECC Curve like scep128r1 or secp256k1 with the ecRecover function?
If not, are there any good Library's which have implemented this ...
3
votes
0answers
49 views
When is a “shard block” cross-linked into a “finalized beacon block”?
In Ethereum 2.0, a shard block for being finalized needs to be linked into a finalized beacon block.
Under which conditions a "shard block" cross-linked into a "finalized beacon block"?
Having 2/3 of ...
0
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0answers
96 views
ethereumjs-tx : sign transaction using unlocked account
Web3js has the following method :
web3.eth.signTransaction(transactionObject, address [, callback])
to sign a transaction using an unlocked account.
Can we sign a transaction in a similar way, ...
0
votes
1answer
36 views
How to sign transactions while Geth does not provide private key?
I've lunched Geth for the first time and created some accounts on it. While creating accounts, I entered a password for each, and a key file is generated which contains encrypted private key belonging ...
1
vote
3answers
180 views
Get method signature from contract rather than manually constructing
Is there a way to get a method signature from the contract object (using Web3.py) rather than manually constructing it? I don't see a function in there that accomplishes this. It seems like ...
2
votes
2answers
95 views
How to decode a transaction to verify its signature in Javascript?
I noticed that it's possible to sign a transaction with a wrong private key. I took the following example found at https://github.com/ethereumjs/ethereumjs-tx
const EthereumTx = require('ethereumjs-...
2
votes
1answer
56 views
What if a malicious validator denies to sign a new block in a shard committee in Ethereum 2.0?
In Ethereum 2.0 (Sharding Blockchain), a new block requires to be signed by all the validators as members of a committee, where blockchain has been sharded in smaller parts for supporting parallel ...
1
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0answers
44 views
address recovery from signature
Sorry for the long question, I tried to keep it as standalone as possible.
For my master thesis I'm analyzing historical data coming from price oracles contract events. In particular, the MakerDAO ...
1
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0answers
16 views
web3.eth.personal.sign is not a function error when deployed on heroku
I am building dApp with react as my front-end frame work, i encountered this error when I deployed on Heroku, sign function doesn't work and it displays that error, specifically TypeError: A.t2.sign....
0
votes
0answers
16 views
How to pay Gas for client? [duplicate]
I'm building a DApp for donations and I do not want my donator ( or donatee) to pay for Gas.
Thus I'm looking for a solution wherein gas is to be deducted from my wallet (third party) and not from ...
2
votes
0answers
29 views
Signatures real use case? [closed]
I'm new to this Ethereum community and I've been reading about signatures processes in Ethereum and smart contracts processes and always end up finding a general use-case where someone signs a "hello ...
1
vote
1answer
36 views
Understanding Transaction in Bitcoin [closed]
I read a lecture about Bitcoin Blockchain. As shown in the slide below, a user Alice sends a transaction to BoB. Alice should
1-) Hash(Hash of the transaction of the coin || Bob Public Key || Alice ...
1
vote
1answer
67 views
Signing message with private key and verifying signer in smart contract
I have a smart contract that provides a message to sign and then validates the signer of the message. Something like:
mapping(address => uint) public userNonce;
function getSigner(bytes32 ...
asked Jan 19 '20 at 19:31
Prashant Prabhakar Singh
6,4723 gold badges27 silver badges55 bronze badges
2
votes
1answer
53 views
What's the magic numbers meaning of 27 or 28 in VRS ( use to ecrover the sender) ? why not 0 or 1?
What's the magic numbers meaning of 27 or 28 in VRS ( use to ecrover the sender) ? why not 0 or 1?
Ecrecover need 0 or 1, but transaction RLP is 27 or 28. Before ecrecover, sub 27 to get 0 or 1. Why ...
0
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0answers
48 views
Signature not matching the sig obtained from MyEtherWallet
I am serializing the unsigned txn in C, then I found Keccak-256 hash and I signed it with the privatekey. However, the resulting signature is not the same as in MyEtherWallet for the same values(...
1
vote
1answer
358 views
Metamask Signing gives different signature than web3.js
I have successfully been using metamask to sign EIP712 data. I am currently trying to write truffle tests and need to replicate the signing process outside the browser. The issue I am facing is that ...
2
votes
0answers
87 views
EIP-712 typed signature for arrays
I'm trying to generate a typed signature for an array in JavaScript based on EIP-712 and using eth-sig-util.
My problem is that I need to sign an array. It says in the specification to use Type[] or ...
0
votes
2answers
51 views
Recovering of typed signature fails because it's too long
I have a typed signature generated by EIP712 V3. It is 132 characters long. I'm trying to recover it using recoverTypedSignature from eth-sig-util. This fails saying:
index.js:1 Error: Invalid ...
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
0answers
25 views
Recover public key from message and signature [duplicate]
I try to recover a public key (not an address) from a message and a signature.
I have the following message:
def offer_hash(msg, nonce):
types = ['bytes',
'bytes',
'...
