[Ethereum] How to sign transaction from frontend with metamask and then send that signed data to rest api for submitting the transaction

blockchainethereum-wallet-dappmetamaskweb3jweb3js

I have a front end connected with metamask wallet and a rest API layer.

My requirement is to sign the transaction from metamask and then to send the signed transaction to rest api to submit the transacion.

Best Answer

I think if metamask sign a transaction they broadcast it to the network. You can retrieve data from the transaction with a callback if you want.

If you want to sign a transaction offline, don't use Metamask but a local file with web3js and your private key hardcoded.

Related Solutions

Web3.js Metamask – How to Send Signed Transaction Using Metamask and Web3

Since you created a contract instance, you can use it have Metamask format the transaction and send sign request to user.

Try replacing this:

const txHash = await this.provider.request({
  method: 'eth_sendTransaction',
  params: [
    {
      from: this.account,
      to: this.contractAddress,
      data: ??????????????
    }
  ],
})

With this:

contract.methods.vote(1).send({
           from: accounts[0]
           
           });

You should see a Metamask request to sign Tx.

Best Answer

Related Solutions

Web3.js Metamask – How to Send Signed Transaction Using Metamask and Web3

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