This content originally appeared on DEV Community and was authored by fangjun
Ethers.js provide abilities to deal with Ethereum blockchain wallet. You can find Ethers.js documents about Wallet here.
Get a better understanding with the following tasks:
Task 1: Create wallet from mnemonic and privateKey
Task 1.1 Create wallet from mnemonic
mnemonic='myth like bonus scare over problem client lizard pioneer submit female collect'
//check whether it is valid mnemonic
ethers.utils.isValidMnemonic(mnemonic)
wallet = ethers.Wallet.fromMnemonic(mnemonic)
Task 1.2 Address, Public key and Private key
wallet.address
//'0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1'
wallet.privateKey
'0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d'
wallet.publicKey
'0x04e68acfc0253a10620dff706b0a1b1f1f5833ea3beb3bde2250d5f271f3563606672ebc45e0b7ea2e816ecb70ca03137b1c9476eec63d4632e990020b7b6fba39'
This is the address with path "m/44'/60'/0'/0/0".
We can also get mnemonic of wallet if it is created from mnemonic.
wallet.mnemonic
{
phrase: 'myth like bonus scare over problem client lizard pioneer submit female collect',
path: "m/44'/60'/0'/0/0",
locale: 'en'
}
Task 1.3 Create wallet from privateKey
We can also create wallet from privateKey. Wallet created in this way has no mnemonic property.
privateKey='0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d'
wallet = new ethers.Wallet(privateKey)
wallet.address
//'0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1'
wallet.mnemonic
//null
Task 2: create 20 addresses with mnemonic
We will use Ethers.js utility for HD Wallet (HDNode) to do this.
Task 2.1 Create HDNode instance from mnemonic
mnemonic='myth like bonus scare over problem client lizard pioneer submit female collect'
hdnode = ethers.utils.HDNode.fromMnemonic(mnemonic)
Task 2.2 Get 20 addresses
basepathstr = "m/44'/60'/0'/0/"
for(i=0;i<20;i++){console.log(hdnode.derivePath(basepathstr+i.toString()).address)}
result:
0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1
0xFFcf8FDEE72ac11b5c542428B35EEF5769C409f0
0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b
......
The first is with path: "m/44'/60'/0'/0/0"
The second is with path: "m/44'/60'/0'/0/1"
The third is with path: "m/44'/60'/0'/0/2"
Task 2.3 Get address with path
We can also get wallet address with path.
mnemonic='myth like bonus scare over problem client lizard pioneer submit female collect'
wallet = ethers.Wallet.fromMnemonic(mnemonic,"m/44'/60'/0'/0/1")
wallet.address
//'0xFFcf8FDEE72ac11b5c542428B35EEF5769C409f0'
Task 3: Sign message with wallet
Task 3.1: Prepare wallet as a signer
mnemonic='myth like bonus scare over problem client lizard pioneer submit female collect'
wallet = ethers.Wallet.fromMnemonic(mnemonic,"m/44'/60'/0'/0/1")
Task 3.2: sign message
message = "solidity-class"
sig = await wallet.signMessage(message)
//'0x8637dce5aeb0b9bd9ee8ce909252806ede88eebc3789436f8f569dd1e45f3f2b47e6633d4119c26917e4b2e08c422028df2209a8ca401f77d4aab9f24b6a40831b'
The signature is result to signing: "\x19Ethereum Signed Message:\n" + message.length + message. Ethers.js docs explains:
A signed message is prefixd with "\x19Ethereum Signed Message:\n" and the length of the message, using the hashMessage method, so that it is EIP-191 compliant. If recovering the address in Solidity, this prefix will be required to create a matching hash.
Task 3.3: verify message
ethers.utils.verifyMessage(message,sig)
//'0xFFcf8FDEE72ac11b5c542428B35EEF5769C409f0'
Task 3.4: sign message hash
We can hash the message by ourselves and sign messagehash instead. We got the same signature.
messageHash= ethers.utils.hashMessage(message)
sig = await wallet.signMessage(messageHash)
//'0xfc40fcec036bd4501ce3bfaf991d561553db6d3601702f8abed9f733eab31a5246163711f71ad48b002ddf83c7cd93656047759ab8e2ff4420c59d5845680ca11b'
Task 3.5 Understanding signature
Get the r,s,v of the signature which is r+s+v.
const r = sig.slice(0, 66);
const s = '0x' + sig.slice(66, 130);
const v = '0x' + sig.slice(130, 132);
Task 4: Send transaction from wallet
Task 4.1 Create wallet
// get wallet account not in hardhat default
privateKey='0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d'
wallet = new ethers.Wallet(privateKey)
wallet.address
//'0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1'
wallet.provider
//null
Task 4.2 send ethers from account 0 to test account
You can send Test Ethers to test wallet address for gas fee usage using MetaMask. Or you can do it in the console as we do in previous part of this tutorial:
signer = await ethers.provider.getSigner()
send_address = await signer.getAddress()
to_address = wallet.address
nonce = await signer.getTransactionCount()
gas_price = await signer.getGasPrice()
gas_limit = ethers.utils.hexlify(21000)
value = ethers.utils.parseUnits('100.0')
tx = {
from: send_address,
to: to_address,
value: value,
nonce: nonce,
gasLimit: gas_limit,
gasPrice: gas_price,
}
await signer.sendTransaction(tx)
await ethers.provider.getBalance(wallet.address).then(result=>ethers.utils.formatEther(result))
//'100.0'
Task 4.3 Try to send from wallet wrongly
Let us try to call sendTransaction from signer which is different with the send_address.
send_address = wallet.address
to_address = await signer.getAddress()
nonce = await signer.getTransactionCount()
gas_price = await signer.getGasPrice()
gas_limit = ethers.utils.hexlify(21000)
value = ethers.utils.parseUnits('1.0')
tx = {
from: send_address,
to: to_address,
value: value,
nonce: nonce,
gasLimit: gas_limit,
gasPrice: gas_price,
}
await signer.sendTransaction(tx)
We got a Error: "Error: from address mismatch"
Task 4.4 Send from wallet as a signer - connect wallet
First, connect wallet to provider. The return of connect() is the wallet instance which can be a signer.
walletsigner = await wallet.connect(ethers.provider)
walletsigner.address
//'0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1'
Task 4.4 Send from wallet as a signer
Second, sendTransaction with walletsigner:
to_address = await signer.getAddress()
nonce = await walletsigner.getTransactionCount()
gas_price = await signer.getGasPrice()
gas_limit = ethers.utils.hexlify(21000)
value = ethers.utils.parseUnits('1.0')
tx = {
from: send_address,
to: to_address,
value: value,
nonce: nonce,
gasLimit: gas_limit,
gasPrice: gas_price,
}
await walletsigner.sendTransaction(tx)
await ethers.provider.getBalance(wallet.address).then(result=>ethers.utils.formatEther(result))
//'98.999968220292873'
If you find this note useful, please follow my twitter @fjun99.
This content originally appeared on DEV Community and was authored by fangjun
fangjun | Sciencx (2022-01-31T16:27:00+00:00) 02 Understanding Blockchain with `ethers.js`: 4 Tasks of wallet. Retrieved from https://www.scien.cx/2022/01/31/02-understanding-blockchain-with-ethers-js-4-tasks-of-wallet/
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