CTV + Pay To Anchor Example 🥪 + ⚓

Here is a simple example of spending a transaction from a CTV (CHECKTEMPLATEVERIFY) contract via Pay To Anchor (P2A), with an extra input to bump the fees.

Index

1. Requirements
2. Setup Instructions
   • Install Rust
   • Signet Configuration
   • Regtest Configuration
3. Resources
4. Transaction Examples
   • Minimum Possible Fees with No Extra Input
   • Adding Extra Input to Cover the Fees
   • Spending with no p2a using the ctv output
   • Spending Using Just a 1p1c Package

Requirements

• Rust https://www.rust-lang.org/tools/install
• Bitcoin Inquisition 28.0 node https://github.com/bitcoin-inquisition/bitcoin/releases/tag/v28.0-inq

Setup

follow this guide to compile bitcoin (works for the inquisition fork) I will add a docker file or something to do this eventually

https://jonatack.github.io/articles/how-to-compile-bitcoin-core-and-run-the-tests

install rust

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

signet

./bitcoind -signet -addnode=inquisition.bitcoin-signet.net -minrelaytxfee=0 -fallbackfee=0.0001

export BITCOIN_RPC_USER="rpc_username"
export BITCOIN_RPC_PASS="rpc_password"
export SIGNET_WALLET="signet wallet name"
cargo run --no-default-features --features "signet"

regtest

./bitcoind -regtest -minrelaytxfee=0 -fallbackfee=0.0001

export BITCOIN_RPC_USER="rpc_username"
export BITCOIN_RPC_PASS="rpc_password"
cargo run --features "regtest"

Resources

Shoutout to supertestnet, bennyhodl, glozow and Jeremy Rubin for their code/examples.

• Bennyhodl's dlcat for the ctv hash function
• Supertestnet Zero Fee Playground
• Ephemeral Anchors on Bitcoin Optech
• Bitcoin GitHub PR #30239
• Bitcoin Core 0.28 Wallet Integration Guide on Bitcoin Optech

Transaction Examples:

Adding Extra Input to Cover the Fees (The code is currenty setup to test this transaction type)

• bump fee with extra input: Parent Transaction on Mempool Space

• bump fee with extra input: Child Transaction on Mempool Space

  

Minimum Possible Fees with No Extra Input

• orignal fee spend: Parent Transaction on Mempool Space
• orignal fee spend: Child Transaction on Mempool Space

Spending with no p2a using the ctv output

#1 (comment)

• spending wih 1p1c package, no P2A: Parent Transaction on Mempool Space

• spending wih 1p1c package, using ctv output: Child Transaction on Mempool Space

Spending using a 1p1c Package

https://x.com/1440000bytes/status/1868375944832156108

• spending wih 1p1c package: Parent Transaction on Mempool Space