Hi Bitcoin Developers,

I am proposing an alternative way to activate soft forks. Please let me 
know if you see any issues with this method.

    BIP: XXX  
    Layer: Consensus (soft fork)  
    Title: nLockTime signaling and flag day activation
    Author: /dev/fd0 <alicexbt@protonmail.com>  
    Status: Draft  
    Type: Standards Track  
    Created: 2024-08-19  
    License: Public Domain

## Abstract

This document describes a process to activate soft forks using flag day 
after `nLockTime` signaling and discussion.

## Motivation

BIP 8 and BIP 9 are controversial. This BIP is an alternative which 
addresses the problems with other activation methods.

## Specification

- Assign numbers to different soft fork proposals or use their BIP numbers
- Users can broadcast their transactions with one of these numbers used as 
`nLockTime` to show support
- Miners inlcuding a transaction in block would signal readiness for a soft 
fork
- Community can analyze these transactions after 3 months and prepare for a 
flag day activation of soft fork

Example:
Use 119 to signal support for OP_CHECKTEMPLATEVERIFY in `nLockTime`

## Reference implementation

Activation: 
https://github.com/bitcoin/bitcoin/commit/ab91bf39b7c11e9c86bb2043c24f0f377f1cf514.diff

Exclusion in relay or mining: 
https://github.com/bitcoinknots/bitcoin/commit/18cd7b0ef6eaeacd06678c6d192b6cacc9d7eee5.diff

---

If a transaction does not get included in block for a long time, users can 
replace it with another transaction spending same inputs and use a 
different `nLockTime`.

/dev/fd0
floppy disk guy

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