Questions tagged [signature]

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How the following pairing equality be verified in Etherum Smart contracts?

I have found available precompiled contracts in solidity. For example, this answer enter link description here points out a precompiled contract that can verify BLS signature. However, looking to the ...
2
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1answer
43 views

Errors in when compiling the BLS signature in remix?

Etherum can verify BLS signatures, In this answer Does Ethereum support pairing operations? There is an example of how to verify BLS in solidity. However, when I tried to test the code in remix, ...
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0answers
26 views

What way there is to implement a new signing scheme in Ethereum?

I want to deploy a new signing scheme for the Ethereum transactions as an alternative to the currently implemented ECDSA. This will be for future research purposes on post-quantum signing schemes. The ...
1
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1answer
66 views

Sending a raw transaction

I'm trying to send ether from one address to another. I have a valid generated address and a private key for that. I have a node is working on Linux in fullmode and RPC server listening on the default ...
0
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1answer
20 views

Is it safe to sign messages with Personal Sign?

I need to sign a message on behalf of the owner and allow the user to deliver my signed message to the contract. I read the metamask documentation, sample signatures, and many different source code ...
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0answers
22 views

How to sign a txn using web3 (1.0) and nodejs?

Firstly I know this has been asked before, but I have became confused with so many different formats and the move to 1.0. Many online resources do not make it clear about the version and I have become ...
2
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1answer
23 views

bn256 and Boneh-Boyen digital signature in solidity

I am looking to have a full-fledged implementation of bn256 in solidity. And Boneh-Boyen digital signature. Is there is any available built-in libraries or implementation in solidity to bn256 and ...
0
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1answer
37 views

Multisig function calls

I am making a dapp in which ethereum user accounts that call certain functions are rewarded with an ERC20 token. All the dapp is based on functions using only one ethereum account as parameter. But if ...
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0answers
29 views

web3.eth.sign() problem [duplicate]

I am using infura and web3 0.20.0 in back-end.(nodejs, I don't want to interact with metamask(front-end)) Now, I am facing a problem. I tried to use ERC865. solidity function ...
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1answer
17 views

How to retrieve transaction hash value from the Promise object using web3js?

I'm trying to retrieve the transaction hash value after I call my smart contract method. My Promise object looks like below. returnPromise: Promise { "pending" } ​ <state>: "...
0
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1answer
17 views

sign 2 things at once

When a user unlocks their private key can two things be signed at once? such as a message as well as a transaction, where the transaction is basically just another message that is meant to be ...
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0answers
26 views

Create a signature using web3 dapp and verify in Solidity contract

I would like to create a dapp where by users can call a function on a smart contract, proving that they know a secret phrase. I am thinking that I would use web3.js to create an public / private key ...
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1answer
46 views

How do I get the address from a signature?

As stated in the question, I have the v, r and s values of a signature given and am trying to find the belonging address. All questions similar to this solved it by either using a solidity smart ...
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0answers
27 views

How to make ECDSA signature of (value_1, value_2) with web3 on Python?

I want to call function with four parameters. I know how to create two of them, but the last two is the r and s components of ECDSA signature of (param_1, param_2). I tried this (and a lot of ...
0
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1answer
36 views

Is S of the signature(R,S) invalid when it is larger than N/2 in Ethereum? [duplicate]

In ECDSA, both signature(r,s) and (r,-s) are valid. However, in Bitcoin, it seems that the signature fails to be verified when s-part in the signature is bigger than half of the group order from this ...
3
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1answer
60 views

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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0answers
23 views

Why is ethereum not using threshold signatures like dfinity for randomness? What's the drawback?

So ethereum goes for RANDAO. The disadvantage with randao is that the last validator in the commit-reveal scheme is able to hold his contributed value back and thereby influence the random outcome. ...
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0answers
36 views

Use Web3 to recover address from message signed by ethers.js?

On the client we are using ethers: const signingKey = new ethers.utils.SigningKey(privateKey) const message = Date.now() const messageBytes = ethers.utils.toUtf8Bytes(String(message)) const ...
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1answer
25 views

how can a signature for a document on a blockchain be revoked?

I am trying to do document verification through blockchain. The way I'm trying to do this is by digitally signing a document, and storing its hash on the blockchain. Now I'm trying to create a feature ...
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1answer
49 views

web3js recover returns different address than what signed message

Web3js as of version 1.0.0 beta supports an interface for verifying signed messages: https://github.com/ethereum/web3.js/issues/404 This is documented here: https://web3js.readthedocs.io/en/1.0/web3-...
0
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1answer
44 views

How can Contracts sign transactions, when they dont have a private key?

When transactions are made the sender is identified by his signature. But Contracts dont have a private key to sign any transaction or message. So I have some questions: Can a Contract initiate a ...
2
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1answer
85 views

Signing meesage | hex string has length 64, want 40 for common.Address

I am using 'web3.eth.sign` to sign a message, using following code snippet: web3.eth.sign(msgHash, address, async (err, signedMsg) => { if(err) { console.log(err) resolve(false) } else ...
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0answers
370 views

The object could not be cloned. && DOMException: Failed to execute 'postMessage' on 'Window'

When I try to sign a message with this simple function const signatue = await window.web3.eth.sign(hash, userAddress) I get an error. In firefox I get Unhandled promise rejection DOMException: "The ...
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0answers
43 views

Ecrecover wrong address is returned

I'm trying to validate signed data with ecrecover. The message is signed like this on the FE: return this.web3.eth.personal.sign( `${nonce}`, publicAddress ).then( ( signature ) => { ...
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0answers
65 views

How does a message signed in Remix IDE?

What is signing method that is used in remix IDE and how is the hash value calculated from the message that is being signed?
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2answers
21 views

Is there any command-line tool to sign transactions offline on a Linux machine?

I have an air-gapped machine with Ubuntu Server. Is there any command line tool which I can quickly download to sign offline transactions? Something like: sign-tx private_key_file nonce=10 gasPrice=.....
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0answers
241 views

TypeError: Cannot read property 'slice' of undefined

web3.eth.accounts.signTransaction(transactionObject, process.env.WALLET_PRIVATE_KEY, function (error, signedTx) { if (error) { log(`${error}`.red); } else { web3.eth....
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0answers
36 views

Automatic sign of Transaction

Is there any secure solution(without exposing a Private key of the user) to automatically sign transactions, which are requested from a DApp, so that user doesn't have to sign each of them manually? I ...
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0answers
23 views

In ethereumj, why the signature use loop to get v?

In the java version of Ethereum, I see the signature code as follows: public ECDSASignature sign(byte[] messageHash) { ECDSASignature sig = doSign(messageHash); // Now we have to work ...
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2answers
67 views

Why does ecrecover() take signature parameters (v,r,s) instead of the full signature?

Is there any reason ecrecover() takes the (v, r, s) signature parameters instead of the full signature, given that these can be easily computed inside the function itself? I am asking because ...
2
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1answer
111 views

Recovering address (web3.eth.accounts.recover) does not return the address of message signer

I am writing a test for a function in my smart contract which attempts to verify that a message comes from the signer. I'm currently using web3.eth.accounts.sign to sign my message with the sender ...
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0answers
63 views

Ethereum Signature Information

I am currently working with Ethereum Signatures (ECDSA and r, s ,v values) and I'm looking for official information about the recovery id v. A few posts like this one explain how the calculation is ...
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0answers
24 views

How to change prefix of signature in Javascript?

Is it possible to change the signature prefix, which by default: "\x19Ethereum Signed Message:\n32" Can I change it to another prefix? I need to get a signature in solidity in this way: bytes32 ...
2
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0answers
50 views

Truffle test to verify events can be queried by the address of the signing user?

I'm trying to write a test which verifies I can query a given type of events by the user/address which sign them. I would like to apply TDD (relevant to say I haven't made the implementation for this ...
1
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1answer
23 views

What should we do if s in the ecdsa signature is greater than n/2?

What should we do if s in the ecdsa signature is greater than n/2? As we all know, in the ECDSA signature of Ethernum, the output s must be smaller than n/2, where s is the signature output and n is ...
1
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1answer
62 views

Signed Message Verification failing for signed messages with multiple passes

I'm using web3 to verify signed messages using the code below: web3.eth.accounts.recover(message, signature); I'm testing against the list of publicly verified signatures on EtherScan - https://...
1
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1answer
224 views

Retrieve public key and check the signature with web3

I create a transaction with signTransaction and I have an output like this: "signedTx": { "messageHash": "0x..", "v": "0x..", "r": "0x..", "s": "0x..", "rawTransaction": "0x....." ...
2
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1answer
352 views

Understanding Ethereum signatures

I would like to understand exactly which signatures are used in the Ethereum. Here https://bitcoin.stackexchange.com/questions/12554/why-the-signature-is-always-65-13232-bytes-long it says that there ...
0
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1answer
80 views

Sign message (obtain v,r,s) inside Solidity

I'm trying to call an Exchange SmartContract which is POORLY designed/implemented and forces you to sign your own parameters instead of using msg.sender (and provides no alternative). <-- I've just ...
0
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1answer
94 views

eth.sign() method giving error

I am using eth.sign from Ethereum wallet developer terminal and getting following error rejection Error: Returned Error: The method eth_sign does not exist/is not available Please advise whats the ...
1
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1answer
227 views

Invalid sender when sending Raw Transaction, signed w/ ethereum-tx on PHP

I am using PHP and ethereum-tx library https://github.com/web3p/ethereum-tx to sign transactions but when trying to send them to the node I got an "invalid sender" error. Besides, exactly the same ...
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2answers
237 views

Signing legal smart contracts

In "conventional", physical legal contracts, parties usually sign them with a handwritten/electronic/digital signature, depending on the form of the contract. But as legal smart contracts are ...
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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 ...
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0answers
44 views

Controlling access to functions with VIEW visibility with signed transactions?

Controlling access to functions that require ETH is straight forward because you get an address you can trust because it has been signed and verified, and therefore upi can use for access control ...
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0answers
111 views

web3 recover address from signature signed by digital bitbox

I use digital bitbox to sign some data and would like to use web3.js to recover the account address. Following https://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html#recover I couldn't ...
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0answers
23 views

Why is an ephemeral key used in creating a digital signature?

When creating the 'S' component of a digital signature, both the actual private key and an ephemeral private key are used. The reasoning I've read is to ensure that the sender’s actual private key ...
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0answers
15 views

compare signed and unsigned hash [duplicate]

with ecrecover the signer's address can be extracted from a signed hash: ecrecover(signedHash, v, r, s) == address But I could not discover how to validate the hash. function validateHash(...
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2answers
109 views

avoid replay attacks on signing on smart contracts

the scenario: a user has a privatekey and wants to sign something to send to the contract ex: the user send his (message,signature,publickey) to the contract and the contract can verify it with the ...
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1answer
20 views

Power of signing transactions and what you can do with that

I have been playing around with state channels and am starting to see the power of signing information/transactions, but haven't got a completely clear idea of what I can do with them. I think I can ...
2
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1answer
1k views

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: ...