# Full-RBF in practice

Research: count the replacements the Labs mempool sees with full-RBF on, and which of them reach blocks.

URL: https://blockspace.wiki/research/full-rbf-in-practice/

**Status on [blockspacelabs.com](https://blockspacelabs.com): Research.**

## What it studies

The Labs site describes it in one sentence: it "counts the replacements our mempool sees with full-RBF on, and which of them reach blocks."

[Full-RBF](https://blockspace.wiki/glossary/full-rbf/) is a relay policy setting about replacing unconfirmed transactions in a node's [mempool](https://blockspace.wiki/glossary/mempool/). The Labs node runs with full-RBF on and an incremental relay fee of 1 sat/vB (as of block 972,320, 2026-10-20 12:17:53 UTC). The study counts the replacements that node sees, then checks which versions end up in blocks.

## The data it will use

"bitcoind mempool events against blocks": the Labs node's own record of what entered and left its mempool, set against the blocks that follow. It is a descriptive card; nothing is counted yet and no results are claimed.

## Related research

Full-RBF is one of the relay levers in [blockspace expansion policy](/research/blockspace-expansion-policy/). The [relay policy](/concepts/relay-policy/) page describes the node's full-RBF setting beside its other policy settings.

Sources:

- The blockspacelabs.com page (index.html) · https://blockspacelabs.com
- Blockspace Holdings records

Live figures: relay as of block 972,320, 2026-10-20 12:17:53 UTC

Updated: 2026-10-20