Questions tagged [signature]
The signature tag has no usage guidance.
499
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Get public key of any ethereum account
Can I somehow get the public key of an ethereum account knowing just the corresponding ethereum address (e.g. 0x54dbb737eac5007103e729e9ab7ce64a6850a310)?
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votes
1
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What does v, r, s in eth_getTransactionByHash mean?
In Ethereum JSON-RPC I found the return is:
Returns
Object - A transaction object, or null when no transaction was found:
hash: DATA, 32 Bytes - hash of the transaction.
nonce: QUANTITY - the number ...
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44
votes
6
answers
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Create and sign OFFLINE raw transactions?
I'm looking to create a raw transaction, sign it, and broadcast it using the eth.sendRawTransaction RPC method.
I would like to do this offline using code or an open-source library OR online but ...
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39
votes
1
answer
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Where is the private key for a contract stored?
This is a question that I am asked often by developers who assume that a contract has a private key of its own to sign any transactions that it makes.
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34
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2
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Ethereum ecrecover signature verification and encryption
The question of signing and verifying signatures with Solidity has been asked in these questions, both of which I have tried to study:
How can I sign a piece of data with the private key of an ...
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33
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4
answers
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workflow on signing a string with private key, followed by signature verification with public key
I know this question has been asked and answered, but while trying to get everything to work, I've come across some problems. This is what I'm trying to do:
1. take a target string 'Schoolbus'
2. ...
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32
votes
5
answers
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How can I sign a piece of data with the private key of an Ethereum address?
I would like to use the key pair of one of my Ethereum accounts to sign a piece of data. How can this be done?
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3
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Is Ethereum secure against an attack by quantum computers?
Does Ethereum implement Post-quantum cryptography? Or will the network break once a malicious actor gains control of an effective quantum computer?
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6
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How do you sign an verify a message in javascript proving you own an Ethereum address?
Is there a js library or even just pure js where I can sign and verify I own an Ethereum address?
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21
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2
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Is it safe to reuse Ether addresses?
I believe it's viewed as unsafe in Bitcoin because of the way transactions are signed. Is this also true for Ether addresses?
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4
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How to properly create a raw transaction and sign it using web3 in browser
I want to create and sign a transaction in browser using web3. In order to create a raw transaction, I think I have to do something like this (hopefully you can fill the gaps of my knowledge)
var pk =...
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How can I verify a signature with the web3 javascript API?
Using the javascript web3 API I can create a signature like this:
> web3.eth.sign(eth.coinbase, "0xdeadbeef")
"...
- 8,711
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votes
1
answer
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Getting the wrong address back from ecrecover
When I sign a string using the following code I get back a different address to the one I signed with. The address returned is different for different strings.
const util = require('ethereumjs-util')
...
- 1,143
15
votes
3
answers
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Invalid sender error on private chain
I created a transaction in Go, signed it with a EIP155Signer signer, but when I try to publish the transaction through the Go client to the private blockchain, I get the error Invalid sender. Any idea ...
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2
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What if two ether functions have the same signature?
It should not be hard to find collision.
There is only 4 294 967 296 possible signatures.
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1
answer
1k
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Ethereum signature verification not matching
What I want to achieve is sign a message and then verify the signature whether verified by same address or not.
Contract to Invoke ecrecover method to verify the address
contract MyAuth {
...
- 1,784
11
votes
3
answers
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Using AWS CloudHSM to sign transactions
Does somebody knows how to properly use AWS CloudHSM to sign ethereum transactions (Keccak256)?
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1
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What are the IDs for the various Ethereum chains? [duplicate]
I'm looking to find the chain ID's for each network (homestead, etc.). I believe the v-value of signatures is associated with these to some extent.
I'm also under the impression that the ropsten ID ...
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11
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4
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How can I verify a secp256r1 signature using solidity
Sorry if you find these questions are basic, but I am new to encryption. As far as I know, Solidity have ecrecover function for this purpose, but it use secp256k1 signature. which I am intend to use ...
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10
votes
2
answers
9k
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Getting an address from ethereumjs-utils ecrecover
I am trying to sign a string using web3.eth.sign() and then get the public key I signed with from the signature. To do this I am using ecrecover() from ethereumjs-utils, which returns a buffer. When I ...
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2
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How to use ethers keccak256?
I tried to use ethers' keccak256 function like this:
import { keccak256 } from "@ethersproject/keccak256";
const signature = keccak256("balanceOf(address)");
But the script ...
- 16k
9
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2
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How does one properly use ecrecover to verify Ethereum signatures?
I've been searching to figure out what I'm doing wrong here, but I've had no luck yet. As far as I can tell, I'm using ecrecover correctly, but I can't seem to get back the signing Ethereum address.
...
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1
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Can I web3.eth.sign with private key
I want to use web3.eth.sign to create a signature that will be stored in blockchain and verified later by a contract (with ecrecover). I'd like to use as few libraries as possible.
Web3 docs specify ...
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How do I extract the v, r, s values from a signed transaction?
If I have a signed transaction such as ...
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1
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2k
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Why is s in transaction signature limited to n/2+1
In the Yellow paper, appendix F "Signing Transactions", it says a valid signature must satisfy:
(281) 0 < s < secp256k1n ÷ 2 + 1
However, in both the cited paper here (ECDSA ...
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1
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Getting wrong address from ECDSA.recover()
I'm signing typed data using _signTypedData() method of ethers. But when I retrieve the signer's address in Solidity Smart Contract using ECDSA.recover(), it returns the wrong address.
Let me know if ...
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How to verify signature in NodeJs via web3j?
I am sending an EIP_712 signature from metamask to the java backend (web3j) and I need to verify it on backend java application.
In this topics it is discussed the support of EIP-712 in java (web3j):
...
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7
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3
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9k
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Is it possible to sign a message in Solidity?
I am trying to sign and verify a signature in Solidity. I understood that it is possible to verify a signature using ecrecover. However, I am not able to find any useful information on signing.
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Sign message with web3 and verify with openzeppelin-solidity ECDSA.sol
I'm trying to get a little example working with ECDSA.sol here: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/cryptography/ECDSA.sol
This contract:
Generate a random(...
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Do I have to unlock my account in geth to call a web3.eth.sign() in JavaScript?
I have:
A geth account
Access to web3 API
I want to:
Invoke the function, web3.eth.sign(coinbase, sha)
If I put this in a javascript file sign.js, and I call node.js, will it sign my message? Or ...
7
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3
answers
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Retrieve the signature of a transaction on the blockchain
How can you find the signature of a transaction? web3.eth.getTransaction() doesn't appear to make that available.
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Can a message hash be recovered from a signature?
A message can be signed and its signing public key recovered given the signature and message hash...
signature = web3.personal.sign(<account>,<message hash>)
pubKey = web3.personal....
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Demystify Transaction signing process
Can someone explain in layman term, why the transaction needs to be signed and the role of public key, private key in transaction signing process.
From what I have read so far:
When user creates a ...
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1
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How are tuples handled for the function selector?
How are tuple types encoded into the function signature to generate the 4 byte function selector? The official specification doesn't state anything for tuple types.
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1
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Is it possible to sign transactions offline in Mist?
is this planned to be implemented? Would be great to be able to sign transactions securely on an air-gapped machine.
I understand that IceBox has offline signing, but they don't support contracts/...
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480
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Can I compress a raw, signed transaction into 140 characters
I would like to basically Make SMS payments of Ether (or bitcoin). The basic Idea I'm thinking about is:
1) Private key signs a transaction on a mobile phone.
2) Raw transaction is 'compressed' ...
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2
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7k
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How to sign transaction using web3.js via metamask
I'm trying to make a signed transaction in browser with web3 injected from metamask and send the transaction to my backend-server and then submit it to blockchain.
However, it's hard to find how I can ...
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How can we verify BGLS aggregate signatures in Solidity?
BGLS [1] is an aggregate signature scheme by Boneh et al., that allows aggregation of signatures on n different messages from n different signers. What I want to achieve is to verify such signatures ...
- 235
7
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1
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Signing messages as a Gnosis Safe (eip1271 support)
Does Gnosis Safe have a native way to validate it's own eip1271 signatures? I know that Gnosis Safe's can have contract accounts as owners and it will verify those signatures according to eip1271 but ...
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1
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Verification of externally-created ECDSA signatures in Solidity
I have ECDSA signatures created using Golang without using web3 or anything related to Ethereum, and I want to verify these in Solidity.
Step 1: Signing the message in Golang
My Go code to create ...
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6
votes
3
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9k
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Signing a raw transaction in Go
I need to sign an offline transaction in golang. I have the following, which is a slight modification of this answer to a similar question:
import "github.com/ethereum/go-ethereum/core/types"
import "...
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1
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Verifying personal.sign signature with pyethereum
I'm trying to verify a signed message from Metamask with pyethereum. I can not seem to recover the correct address from the signature. Lack of documentation isn't helping matters.
On the client ...
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how to use personal_sign
https://github.com/ethereum/go-ethereum/wiki/Management-APIs
{"method": "personal_sign", "params": [message, account, password]}
The param message is a hex string, how can I generate it from a tx?
...
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2
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847
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Issue while trying to verify signature
I am using the following to sign a message
var str="Trial with signature";
text=web3.sha3(str);
var sig=web3.eth.sign(eth.accounts[0],text);
Now after obtaining the hash value from the text and ...
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2
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How to sign a message using secp256k1 in Ruby?
I'm trying to write a sign function in Ruby for Ethereum using secp256k1.
I have access to this sign_compact function which seems to be for Bitcoin:
https://github.com/lian/bitcoin-ruby/blob/master/...
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6
votes
1
answer
969
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Signatures differ in web3js and web3j
I'm using web3J version 3.0.0-alpha4 and hit following problem. When I sign the same raw message (it's simply string like "TEST" for now) I get different signatures using web3js i web3j. The signature ...
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1
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How to get private keys on Truffle from Ganache accounts
Doing some ERC-735 tests on truffle+ganache I got stuck when creating claim signatures. They need to be signed from my ganache account, but I don't know its private key. The code to be used is this:
...
5
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3
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Get rid of Metamask sign confirmation dialog
I am using web3 for users to sign some random string from web application. I give user string, he/she signs it after Metamask dialog's "Sign" button. but there is a problem when i want user to sign ...
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smart contract transaction signature
I have a thought about the smart contract. I would like to know when the smart contract sends a transaction (send ether to someone) did it sign the transaction if yes how it does? does it have a ...
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1
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Experiencing an "invalid signature error" when trying to use the "permit" feature of ERC20 tokens that support EIP712
I'm currently writing a few smart contracts in solidity and interacting with them through web3. The premise being that a token can be deposited into a pool and can then subsequently withdraw at a ...
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