Send unsigned transaction

@ricmoo Thanks for the awesome work !!!

can be thought of next steps from here: https://github.com/ethers-io/ethers.js/issues/535

I have a contract (object) with voidSigner.

    const contract = new ethers.Contract(
      addr,
      abi,
      voidSigner
    );

NOTE: signer is on different system

Basically I want this contract to be called by account whose private key is on different server/system. So I am using a voidSigner from its public account address. Making sure that nounce and other public info could be filled up in order to make a transaction.

So preparing txHash and getting it signed like this.

  // Make Unsigned transaction object
  // https://docs.ethers.io/v5/api/contract/contract/#contract-populateTransaction
  const unsignedTx = await contract.populateTransaction.create(
    a,
    b,
    c
  );

  // Serialize the transaction
  // https://docs.ethers.io/v5/api/utils/transactions/#utils-serializeTransaction
  const serializedUnsignedTx = ethers.utils.serializeTransaction(unsignedTx);

  // compute the hash necessary for siging the transaction
  const txHash = ethers.utils.keccak256(serializedUnsignedTx);

  let txSig;
  // txSig = crypto_signer.getSignature(info.getAccountId(), txHash);

So I have all the pieces for a complete transaction: unsignedTx txHash signature

do I need to make Transaction object separately to call provider.sendTransaction( transaction ) or is there any better way to send my transaction.

Thank YOU !!

Another way I could think of is again using ethers.utils.serializeTransaction( tx [ , signature ] ) with signature, and use jsonRpcProvider.send( method , params )

[ricmoo]

For this purpose, the UnsignedTransaction and PopulatedTransaction should be compatible.

You could probably use tx = await voidSigner.populateTransaction(tx) to populate the chainId, gasLimit, gasPrice and nonce properties.

Let me know if that works.

[shinsuny]

@ricmoo Thank you so much !! Reply was so quick.

Then I will be using provider.sendTransaction.

Will get back in case of any issue.