[bitcoin-dev] A Replacement for RBF and CPFP: Non-Destructive TXID Dependencies for Fee Sponsoring

[Dmitry Petukhov]

В Wed, 23 Sep 2020 15:10:22 -0700
Jeremy via bitcoin-dev <bitcoin-dev at lists.linuxfoundation.org> wrote:

> It's not particularly important that a transaction be in the same
> block once sponsored, it could also be in the last 100 blocks (the
> opposite of proposed change 3).

This will in effect enable "inverse timelock" mechanism for up to 100
blocks for sponsor transactions: broadcast a transaction A, and
then make a pre-signed sponsor transaction B that sponsors A.

Transaction B will become invalid after 100 blocks due to this rule.

If you put a timelock on B to make it valid after 50 blocks,
then it will be valid between block 50 and 100 after A is confirmed.