Ethereum: What is the script assembly and execution in P2TR spend (spend from Taproot)

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Ethereum: Understanding the assembly and execution of scripts in P2TR Spend (expenses from Taproot)

Now that you have a solid understanding of the assembly and execution of Bitcoin scripts, in particular in regards to the payments of Taproot (P2PKH), we will deepen the details of the scripts assembly for the expenses of P2TR (expenses from Taproot).

What is P2tr Spend?

A P2TR expense involves spending bitcoins from a public direction that was previously spent using Taproot (P2PKH). In other words, you are spending the same bitcoins that were originally spent on a Taproot transaction. This allows more complex and safe payments without the need to create new scripts or derive new directions.

Scripts assembly for P2TR expenses

To execute an expense of P2TR, we must first understand the scripts assembly process that uses the Ethereum Ropsten test network. The key components of an Ethereum script are:

• Input scripts

  

  : Define how the entry amount should be spent.

• Output scripts : They determine what is sent to the recipient and any additional rate or retransmitter.

For a P2TR expenditure, we have two main entrance scripts: one for the original Taproot transaction and another that creates a new script for re-gastaged bitcoins.

Script Taproot entrance

The original Taproot transaction has an scriptpubkey input script, which is a key-value pair that represents the public address to be spent. This input script is used as the first entry in our P2TR expense.

`Solidity

The re-ggaled Taproot transaction has an output script that defines how the amount should be sent. Thescriptpubkey

Solidity

` Solidity

Pragma Solidity ^0.8.0;

Contract Taprootspend {

// Input script of the original Taproot transaction

Address public Owner;

// Function to execute the P2TR spending

ACQU -FOREP2TR FUNCTION (Uint Amount) Public {

// Create a new entrance script for re-handled bitcoins

Address Public Receiveraddress;

Uint256 public outputamount = 0;

// define the output script using the original Taproot transaction script

FUNCTION GETOUTPUTSCRIPT () INTERNAL RETURNS (ADDRESS, UINT256) {

Return Address (0x1 …, Owner), Amount;

}

// Use the re-scratch Taproot transaction to calculate the address and amount of the recipient

Address Public Newaddress;

Uint256 public Newamount = 0;

// Define a function that takes the output script of the original Taproot transaction and calculates the corresponding inputs for the re-gstaded bitcoins

Function Getnewinputs () Internal Returns (Address [] Memory, Uint256 []) {

// Calculate the address of the recipient using the public direction of the original Taproot transaction

Address [] Memory Reiversive = Newaddress;

// Calculate the exit amount in Wei

Uint256 [] Memory outputs = Newuint256 (recipients.