Questions tagged [public-key]
The public-key tag has no usage guidance.
116
questions
0
votes
1answer
31 views
Proper way to save a public key as bytes in a contract
I need to save public keys in many contracts.
Despite that this choice costs, I store them as bytes (I know that the best way is to split the key and store it to different bytes32 constants, but that ...
1
vote
1answer
25 views
secp256k1 library does not create correct public key
I am trying to get public key from private key using secp256k1 library. https://github.com/bitcoin-core/secp256k1
I set same private key(sk) in here. https://github.com/ethereumbook/ethereumbook/blob/...
0
votes
1answer
27 views
How to parse ecrecover parameters?
I am looking into getting the public key from ANY ethereum address (not owned by me) that has sent a transaction at least once. It seems that the most viable solution here would be to use ethereumjs-...
0
votes
1answer
26 views
How can I encrypt a file using an ethereum public address and decrypt it with the private address?
The expected outcome is very simple:
Users will send their ERC20s to a smart contract. Depending on the amount, each user will get a file specifically created for them. I want to distribute that ...
1
vote
1answer
22 views
Are there identifiers for smart contracts?
Say I want to reference another smart contract in my smart contract.
Do smart contracts have an identifier (like a number 0xjdjdjdjdjjddj etc.)? And if they don't, how would you reference a ...
3
votes
1answer
154 views
Generate Ethereum address with private key
How can I generate ethereum account address and private key that works on ethereum main network using web3 in nodejs?
0
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1answer
42 views
In bitcoin it's bad to reuse addresses (less security, as public key has already been revealed), how about ethereum? [duplicate]
In bitcoin it's bad to reuse addresses (less security, as public key has already been revealed), how about ethereum? Is the public key revealed when the first transaction (first nonce) is used?
0
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1answer
79 views
how to send transaction from different account in metamask
I have two accounts in metamask, when I called the function, web3 always used my default account in the metamask, I want to send transaction to the smart contract I deployed with another account, so ...
1
vote
0answers
21 views
Why a buffer is required in the process of creating keys from the seed
This hdkey library is creating a Buffer in the process of creating keys as an example.
var HDKey = require('hdkey')
var seed = '...
1
vote
1answer
143 views
Convert 64 byte public key to 20 byte address in Solidity
I am trying to convert a 128 characters hex encoded public key to an address in Solidity (0.5).
For example the pubkey would be:
...
4
votes
2answers
163 views
How to encrypt a file with multiple public address?
Can I encrypt a file with multiple public address such that each of them can decrypt the file using their private keys?
Thus achieving a system to securely store file on IPFS which can be accessed by ...
0
votes
1answer
32 views
Assymetric encryption with only address
I would like to send an encrypted message to an address, without knowing their public key.
If I understand ECIES correctly, in order to send an encrypted ECIES message to a party, say Bob, I need to ...
0
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0answers
98 views
Generate derivated address from xpub
I managed to get Bitcoin addresses from xpub using bitcoinj with this code :
DeterministicKey hd = DeterministicKey.deserializeB58("xpub...", MainNetParams.get());
DeterministicHierarchy hi = new ...
1
vote
0answers
33 views
How to know address belongs to current Ledger, way to get path ? (By using Ledger inside browser - JavaScript)
Ledger can generate many wallet addresses,
Is there way how to find out that given public key address belongs to currently connected Ledger device ? (Using JavaScript API in web application)
And ...
0
votes
0answers
46 views
Nano S Ethereum Public Key and Chain Code
I'm trying to figure out how to get this repository (https://www.npmjs.com/package/@ledgerhq/hw-app-eth) to interact with the Nano S ledger, the hardware wallet.
I can't figure out what tools or ...
0
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0answers
164 views
Encryption with Ethereum Keys for all Clients (iOS,Android,Web)
I was trying to encrypt data with Ethereum Key pairs. So far, I have managed to encrypt and decrypt data with these keys using ECIES schema on eth-crypto. Eth-crypto is a package which is built on top ...
0
votes
0answers
161 views
Recover public key from transaction signature
I have this transaction:
{"blockHash":"0x163ad564b32bf17db9262391c2c9a5f191e4fd0b098ae5ce9d2e3 e7dcde4bd70","blockNumber":"0x2","from":"0x55d40a83b8445c004df5964ce4a0e261b599c01a","gas":" ...
1
vote
1answer
342 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....."
...
1
vote
5answers
369 views
Can I easily generate a public address which has no private key?
I might be wrong in some of the facts that I state here, so please correct me if necessary.
My understanding:
Private key - 256 bits
Public key - 256 bits
Public address - the last 160 bits of a ...
1
vote
2answers
193 views
Running 'parity account new' - is the generated account suitable for all networks (mainnet, ropsten, kovan, etc)?
From a command line, I run parity account new.
I am then asked to enter a password (twice), and an account-address is printed.
In addition to that, a JSON file is created.
Finally, I use this ...
1
vote
1answer
64 views
Who approves my public key in Ethereum network?
In a PKI approach, a public key is approved by a Certificate Authority (CA) in a centralized manner. However, since Ethereum is a decentralized network, how is my public key validity is approved? Or, ...
3
votes
1answer
205 views
How to generate address from xpub in JS?
How to generate address from xpub in JS? Should i use BIP39 or 44? If yes, how exactly?
2
votes
1answer
326 views
Extended private key vs private key
I am trying to make an hd wallet based on nodejs. So to have a secure wallet I have created wallet in my offline machine
const hdkey = require('ethereumjs-wallet/hdkey');
const bip39 = require('...
1
vote
1answer
49 views
Cannot send transactions
I have a online shop where users can recieve ETH and do shopping.
So to have a secure wallet, I have created an offline service which generates xpub and xpriv which I use to generate addresses in my ...
1
vote
1answer
186 views
web3py: get public key from transaction
I'm trying to retrieve the public key of an address from a transaction. I'm getting the transaction via tx = web3.eth.getTransaction('xxx')
According to the docs the public key should be retrievable ...
2
votes
1answer
410 views
Generate addresses using xpub
I have a cold storage where I installed BTC-Electrum and LTC-Electrum wallets. So I have took extended master public keys and have generating addresses in my online service. Now I want to generate ...
1
vote
1answer
325 views
web3.py manually derive address from public key string [for dummies]
Let's say I need to derive the address from a public key string.
0xbb8250cc01a0afa7dcaee987b2adda8d1b0a0bb2f7cc427bd942a98c7837364d62e6ea4728a99db39fd55a6f7474a159ca88a96b40279044a1349a2280c8cd43
...
1
vote
1answer
32 views
How to use web3js to put it in json?
I have used web3js by using it in the form of node(npm). But I don't know how to extract some data generated from nodes.
Does anyone know this web3js so the results can be changed to json form? ...
3
votes
1answer
505 views
web3py: get public key from private key (without prior transaction)
Is there a way to get the public key from a private key with web3.py? I know I could get it by checking a transaction signed by that key but that's not working for me in this example.
It should be ...
3
votes
0answers
560 views
Verify Public Key from an RSA SHA256 signature
Given an RSA SHA256 signature (obtained from encrypting a hash using an RSA Private Key), I must assert whether a provided Public Key matches this signature or not.
It is imperative that this ...
1
vote
2answers
132 views
Can the same keypair be used for holding ETH and different ERC20 tokens?
I have an ETH keypair.
Can I hold ERC20 tokens with this ETH keypair also?
Can I hold several ERC20 tokens with one key pair?
0
votes
1answer
32 views
discover if a binary data contains Ethereum address in it?
Is there a way to guess, with some level of probability , that a 20 byte array is an Ethereum address, besides doing a query against the current StateDB and its history ?
I want to discover hidden ...
2
votes
1answer
133 views
Is it possible to tell that two addresses were derived from the same private key?
As we know, a single private key or seed phrase generates many addresses.
Is it possible for someone to determine that two addresses were derived from the same private key?
6
votes
1answer
320 views
Why are the last 20 bytes of the public key used as the address?
According to this post regarding how to derive the Ethereum address from a public key:
Take the last 40 characters / 20 bytes of this public key
(Keccak-256). Or, in other words, drop the first ...
3
votes
1answer
131 views
Is there any lifespan of data on Rinkeby testnet?
I read that there are pre-autorized nodes which creates blocks on rinkeby testnet.
If developers keep publishing smart contract and do transactions for testing purpose isn't the size of testnet will ...
-1
votes
1answer
46 views
Which node server for creating Ethereum keypairs and sending transaction programatically?
I need to create Key Pairs, and send transactions from my server program (probably node.js.) The code part is clear -- at least in terms of available examples -- and I know where to go with it.
My ...
5
votes
1answer
512 views
Extracting Public key from signed Ethereum message or transaction in JavaScript
I'm trying to find out how to derive a public key (not the address) of an Ethereum account by using ethereumjs-util's ecrecover method.
Basically I get a transaction by hash using Web3, convert r, s ...
2
votes
1answer
627 views
Get the public address & key associated with one of the Ganache accounts using Web3.js?
How do I get the public address & key (not address or account) for one of the accounts that Ganache displays on startup using Web3.js? I need it for a unit test I'm creating that tests transaction ...
1
vote
3answers
2k views
How to generate multiple eth-addresses from one private key? [duplicate]
Is it possible to generate different multiple eth-addresses from one private key?
The goal is to implement a JavaScript service that will allow a user to buy a subscription using cryptocurrency.
...
3
votes
3answers
434 views
RE-Encrypt file in IPFS
If I have an encrypted file in IPFS with a symmetric key that I share, can I after that decrypt and re-encrypt that file with a different key in order to revoke access?
0
votes
1answer
138 views
How can I provide an ethereum public address to each user registering on my website.?
is it possible to do using web3.js for a dapp that is going to be run on mainnet.?
I have a requirement to assign valid ethereum address to each user who are registering on my website. I want this ...
3
votes
2answers
5k views
The difference between contract address and wallet address
Disclaimer: this is a rather long question.
To my understanding, contract address and wallet address are two profoundly different concepts, with the only thing in common being the fact that they are ...
2
votes
0answers
275 views
Customizable key generator for Node JS
I've been looking for a javescript/nodejs package that would take a passphrase as input and generate a public key. But I need it to produce the exact same public key with the exact same passphrase - ...
2
votes
2answers
132 views
Why public keys are not used directly as account addresses? [duplicate]
I understand that addresses are hashes of the public keys. But why? What is the rationale behind this design decision?
And why 160 bits? Why not just use the hash directly? Is 160-bit guaranteed ...
0
votes
1answer
83 views
Send Tokens To Address, or Public Key?
I had a look at this video
https://www.youtube.com/watch?v=vhdDQXLCRpE
I can send tokens to MyEtherWallet from my exchange. Do I have to withdraw to my public key? Or, can I send it to one of my ...
1
vote
1answer
45 views
“public key” and “account” : are the same?
When I create a new account as follows :
web3.eth.personal.newAccount('pass').then(console.log);
-> pass is account password.
Then, I receive an account as follows :
...
3
votes
3answers
1k views
How to recover public from tx signature(r,s) and verify signature?
My first question is how to verify signature using only r,s and elliptic curve paramete, and an address (which is hashed of public key, so cannot retrieve public key from the address)?
Next question ...
1
vote
0answers
218 views
How to export the extended public key out of a Ledger Nano S?
In order to provide secure use-once addresses to an application as a application developer I would like to export the public master key from a Nano S. Then I could derive many public keys from it and ...
0
votes
1answer
59 views
How to generates the private and public key from a given name or address? [duplicate]
I want to generate both keys for transaction and also let me know how to calculate the processing time using solidity for the whole program?
2
votes
0answers
230 views
How to export extended (master) public key from MetaMask
I want to export extended public key for watch-only access to all ethereum addresses in the MetaMask HD wallet at once. It's very usefull for tracking of all portfolio/wallets in one place, especially ...
