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Full-RBF in practice

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

Status on 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 is a relay policy setting about replacing unconfirmed transactions in a node's mempool. The Labs node runs with full-RBF on and an incremental relay fee of 1 sat/vB (as of block 972,308, 2026-10-20 11:17:25 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.

Full-RBF is one of the relay levers in blockspace expansion policy. The relay policy page describes the node's full-RBF setting beside its other policy settings.

Sources #

  1. The blockspacelabs.com page (index.html) · blockspacelabs.com
  2. Blockspace Holdings records

Live figures: relay as of block 972,308, 2026-10-20 11:17:25 UTC. Refreshed hourly.

Updated 2026-10-20 · This page as Markdown