Ethereum: Step by step example to redeem a P2SH output required

I can provide you with a step-by-step example of how to redeem a P2SH output required for a simple one-signature transaction in Ethereum.

Disclaimer:

This is a simplified example and not intended to be used in production. Please note that BIP16 (Bitcoin Improvement Proposal 16) requires a more complex implementation, including script verification, which is outside the scope of this article.

Ethereum’s P2SH (Private Key Hash) transaction format allows for multiple outputs with different scripts, such as the mandatory-script-verify-… error. Here’s an example of how to redeem a P2SH output required for a simple one-signature transaction:

Create a new Ethereum wallet

First, let’s create a new Ethereum wallet using the eth-wallet command-line tool:

$ eth-wallet create-newwallet

This will prompt you to choose a wallet name and location. Let’s use the default location.

Generate private keys

Next, let’s generate some private keys for our new wallet:

$ eth-wallet getnewaddress 0x...

This will output a new public address (e.g., 0x...) and a corresponding private key (e.g., 0x...). We’ll use these to create the one-signature transaction.

Create a simple one-signature transaction

Let’s create a new transaction that requires only one output with a script. We’ll use the following data:

{

  "transaction": {

    "to": "0x...", // recipient address

    "value": 1, // input value (1 Ether = 1000000 USD)

    "gas": 20000, // gas limit

    "gasPrice": 20, // gas price in wei

    "script": "0x..." // script to execute for this transaction

  }

}

We’ll use the eth-fulfillment command-line tool to create and redeem a P2SH output required for this transaction:

$ eth-wallet newaddress 0x...

$ eth-fulfillment --scripting-mode=3 --transaction="0x... 1 20000 20 0x..." --tx-index=0 0x...

This will create a new transaction and redeem the first output required by the script. The --scripting-mode=3 flag enables script verification, which is necessary for P2SH transactions.

Verify the redemption

To verify that the redemption was successful, you can use the following command:

$ eth-fulfillment --scripting-mode=0 --transaction="0x... 1 20000 20 0x..." --tx-index=0 --output-index=0 --verify --txhash="your_transaction_hash"

This will verify that the redemption was successful by checking the transaction’s output index.

Note: You’ll need to replace your_transaction_hash with the actual transaction hash generated by your wallet.