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--- | ||
sidebar_position: 6 | ||
sidebar_label: 'Web3 Wallet' | ||
--- | ||
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# web3.js Wallet Guide | ||
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## Introduction | ||
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The web3-eth-accounts package contains functions to generate Ethereum accounts and sign transactions and data. | ||
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:::tip | ||
In Ethereum, a private key is a crucial component of the cryptographic key pair used for securing and controlling ownership of Ethereum addresses. Ethereum uses a public-key cryptography system, where each Ethereum address has a corresponding pair of public and private keys. This key pair will allow you to have ownership associated with the ethereum address, store and access funds and send transactions. | ||
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Be sure to have your private key stored and encrypted in a safe place, as losing or sharing it may result in permament loss of access to the asscoiated Ethereum address and funds. | ||
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To generate a private key: `const privateKey = web3.eth.accounts.create().privateKey;` | ||
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Learn more about wallets [here](https://ethereum.org/en/wallets/) | ||
::: | ||
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## web3-eth-accounts | ||
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### Methods | ||
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The following is a list of web3-eth-account [methods]( /api/web3-eth-accounts/class/Wallet#Methods) with descriptions and examples of usage: | ||
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- [create](https://docs.web3js.org/libdocs/Accounts#create) | ||
- [privateKeytoAccount](https://docs.web3js.org/libdocs/Accounts#privatekeytoaccount) | ||
- [privateKeytoAddress](https://docs.web3js.org/libdocs/Accounts#privatekeytoaddress) | ||
- [privateKeytoPublicKey](https://docs.web3js.org/libdocs/Accounts#privatekeytopublickey) | ||
- [parseAndValidatePrivateKey](https://docs.web3js.org/libdocs/Accounts#parseandvalidateprivatekey) | ||
- [sign](https://docs.web3js.org/libdocs/Accounts#sign) | ||
- [signTransaction](https://docs.web3js.org/libdocs/Accounts#signtransaction) | ||
- [recoverTransaction](https://docs.web3js.org/libdocs/Accounts#recovertransaction) | ||
- [hashMessage](https://docs.web3js.org/libdocs/Accounts#hashmessage) | ||
- [recover](https://docs.web3js.org/libdocs/Accounts#recover) | ||
- [encrypt](https://docs.web3js.org/libdocs/Accounts#encrypt) | ||
- [decrypt](https://docs.web3js.org/libdocs/Accounts#decrypt) | ||
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### Creating a Web3Account with the web3-eth-accounts package and signing a message | ||
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``` ts | ||
import { create } from 'web3-eth-accounts'; | ||
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// the create method returns a Web3Account object. It contains an address and private key and allows you to be able to encrypt, sign and signTransaction. | ||
const account = create(); | ||
{ | ||
address: '0xbD504f977021b5E5DdccD8741A368b147B3B38bB', | ||
privateKey: 'privateKey', | ||
signTransaction: [Function: signTransaction], | ||
sign: [Function: sign], | ||
encrypt: [AsyncFunction: encrypt] | ||
} | ||
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account.sign("hello world"); | ||
{ | ||
message: 'hello world', | ||
messageHash: '0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68', | ||
v: '0x1b', | ||
r: '0xe4fce466ef18f6cd8b4f4175a9a04cd2872a1a6a8cfc2ff67fb0cfd6d78ec758', | ||
s: '0x37ca3a789976f1854d16e50a04caf2e06ee14b0ac4a5878b43929767f2008288', | ||
signature: '0xe4fce466ef18f6cd8b4f4175a9a04cd2872a1a6a8cfc2ff67fb0cfd6d78ec75837ca3a789976f1854d16e50a04caf2e06ee14b0ac4a5878b43929767f20082881b' | ||
} | ||
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``` | ||
### Import a private key and sign a transaction with the web3 package | ||
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``` ts | ||
import Web3 from 'web3'; | ||
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const web3 = new Web3("provider"); | ||
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const account = web3.eth.accounts.privateKeyToAccount("privateKey"); | ||
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signedTransaction = await account.signTransaction({ | ||
from: a.address, | ||
to: '0xe4beef667408b99053dc147ed19592ada0d77f59', | ||
value: '0x1', | ||
gas: '300000', | ||
gasPrice: await web3.eth.getGasPrice() | ||
}) | ||
> { | ||
messageHash: '0xfad22c3ab5ecbb6eec934a21243ee1866fbbd3786f4e8e8ec631b917ef65174d', | ||
v: '0xf4f6', | ||
r: '0xc0035636d9417f63fdd418bc545190e59b58a4ff921bbf4efebf352dac211f11', | ||
s: '0x4944d746ff12c7bca41f77c8f7d75301cea8b205e021dfde34d09d5bdccc713d', | ||
rawTransaction: '0xf866808477359400830493e094e4beef667408b99053dc147ed19592ada0d77f59018082f4f6a0c0035636d9417f63fdd418bc545190e59b58a4ff921bbf4efebf352dac211f11a04944d746ff12c7bca41f77c8f7d75301cea8b205e021dfde34d09d5bdccc713d', | ||
transactionHash: '0xa3fed275c97abc4a160cd9bef3ec90206686f32821a8fd4e01a04130bff35c1a' | ||
} | ||
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``` | ||
### Local wallets | ||
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Local wallets are an in-memory [wallet](/api/web3-eth-accounts/class/Wallet/) that can hold multiple accounts. | ||
Wallets are a convenient way to sign and send transactions in web3.js. | ||
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:::warning | ||
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If used within the browser, wallets are not saved anywhere and disappear when the page is refreshed. | ||
If used within your application, wallets will disappear after the program is completed. | ||
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::: | ||
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### Methods | ||
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The following is a list of Wallet [methods]( /api/web3-eth-accounts/class/Wallet#Methods) in the web3-eth-accounts package with description and example usage: | ||
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- [add]( /api/web3-eth-accounts/class/Wallet/#add) | ||
- [clear]( /api/web3-eth-accounts/class/Wallet/#clear) | ||
- [create]( /api/web3-eth-accounts/class/Wallet/#create) | ||
- [decrypt]( /api/web3-eth-accounts/class/Wallet/#decrypt) | ||
- [encrypt]( /api/web3-eth-accounts/class/Wallet/#encrypt) | ||
- [get]( /api/web3-eth-accounts/class/Wallet/#get) | ||
- [load]( /api/web3-eth-accounts/class/Wallet/#load) | ||
- [remove]( /api/web3-eth-accounts/class/Wallet/#remove) | ||
- [save]( /api/web3-eth-accounts/class/Wallet/#save) | ||
- [getStorage]( /api/web3-eth-accounts/class/Wallet/#getStorage) | ||
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## Creating a local wallet | ||
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```ts | ||
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// creating a new wallet | ||
web3.eth.accounts.create() | ||
> Wallet(0) [ | ||
_accountProvider: { | ||
create: [Function: createWithContext], | ||
privateKeyToAccount: [Function: privateKeyToAccountWithContext], | ||
decrypt: [Function: decryptWithContext] | ||
}, | ||
_addressMap: Map(0) {}, | ||
_defaultKeyName: 'web3js_wallet' | ||
] | ||
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// add a wallet using a private key | ||
web3.eth.accounts.wallet.add("PrivateKey"); | ||
``` | ||
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## Signing a message using a wallet | ||
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``` ts | ||
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import Web3 from 'web3'; | ||
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web3.eth.accounts.wallet.create(1); | ||
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const message = web3.utils.utf8ToHex('Hello world'); // sign only takes hexstrings, so turn message to hexstring | ||
web3.eth.sign(message, 0).then(console.log); // 0 refers to using the first index of the wallet to sign the message | ||
> { | ||
message: '0x48656c6c6f20776f726c64', | ||
messageHash: '0x8144a6fa26be252b86456491fbcd43c1de7e022241845ffea1c3df066f7cfede', | ||
v: '0x1c', | ||
r: '0x3a420906f331896cb5db1366cdaeef1f0b14f9f71d72c178e87b76f8b31f3f36', | ||
s: '0x32ffccc78638c1d7e46dbf16041ddaef90ab50a85eeeaa46f8c496a39237831a', | ||
signature: '0x3a420906f331896cb5db1366cdaeef1f0b14f9f71d72c178e87b76f8b31f3f3632ffccc78638c1d7e46dbf16041ddaef90ab50a85eeeaa46f8c496a39237831a1c' | ||
} | ||
``` | ||
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## Browser injection - Sending a transaction with Metamask | ||
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This is an example html file that will send a transaction when the button element is clicked. | ||
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To run this example you'll need Metamask, the `index.html` file below in your folder and you'll need a local server: | ||
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`npm i http-server` | ||
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`npx http-server` | ||
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Afterwards your file will be served on a local port, which will usually be on `http://127.0.0.1:8080` | ||
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### index.html | ||
``` html | ||
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<!DOCTYPE html> | ||
<html lang="en"> | ||
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<head> | ||
<meta charset="UTF-8"> | ||
<meta name="viewport" content="width=device-width, initial-scale=1.0"> | ||
<title>Send Transaction Example</title> | ||
<script src="https://cdn.jsdelivr.net/npm/web3@latest/dist/web3.min.js"></script> | ||
</head> | ||
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<body> | ||
<button id="sendButton">Send Transaction</button> | ||
<script> | ||
// Wrap the code inside an async function | ||
(async function () { | ||
try { | ||
// Check if MetaMask is installed and connected | ||
if (typeof window.ethereum === 'undefined') { | ||
throw new Error('MetaMask is not installed or not properly configured'); | ||
} | ||
// Connect to the Ethereum network using MetaMask | ||
const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' }); | ||
const web3 = new Web3(window.ethereum); | ||
// Add event listener to the Send Transaction button | ||
const sendButton = document.getElementById('sendButton'); | ||
sendButton.addEventListener('click', async () => { | ||
try { | ||
await web3.eth.sendTransaction({from: accounts[0],to:"0x38E2fb54587208f29B1452Bb8136d271BE0912EF"}) | ||
} catch (error) { | ||
console.error(error); | ||
} | ||
}); | ||
} catch (error) { | ||
console.error(error); | ||
} | ||
})(); | ||
</script> | ||
</body> | ||
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</html> | ||
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``` | ||
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## Sending a transaction using a local wallet with contract methods | ||
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``` ts | ||
// First step: initialize `web3` instance | ||
import { Web3 } from 'web3'; | ||
const web3 = new Web3(/* PROVIDER*/); | ||
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// Second step: add an account to wallet | ||
const privateKeyString = 'Private key'; | ||
const account = web3.eth.accounts.wallet.add(privateKeyString).get(0); | ||
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// Make sure the account has enough eth on balance to send the transaction | ||
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// fill ContractAbi and ContractBytecode with your contract's abi and bytecode | ||
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async function contractMethod() { | ||
try { | ||
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// add the contract details of which method you want to call, using the contract abi and contract address | ||
const contract = new web3.eth.Contract(ContractAbi, "contract address"); | ||
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// call contract method and send | ||
await contractDeployed.methods | ||
.method('0xe2597eb05cf9a87eb1309e86750c903ec38e527e') | ||
.send({ | ||
from: account?.address, | ||
gas: '1000000', | ||
// other transaction's params | ||
}); | ||
} catch (error) { | ||
// catch transaction error | ||
console.error(error); | ||
} | ||
} | ||
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(async () => { | ||
await contractMethod(); | ||
})(); | ||
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``` |
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