Stratum signalling history

Frozen dataset covering 2026-08-04 04:50:03 UTC through 2026-08-30 23:59:57 UTC. The listeners are a separate capture and kept recording past that point; what is published here stops on 30 August.

Every mining.notify job carries a block version field. When bit 4 is set in a version-bits header (top bits 001), the pool is distributing work that signals BIP-110. These are jobs, not solved blocks: intent, not proof of enforcement. The axis covers every observed day.

All eight blocks the SHA-256d fork ever produced fall inside this range and are marked below, from 961,632 on August 8 to 961,639 on August 28. So does the end of it: at 03:18:15 UTC on August 30 the OCEAN BIP-110 endpoint dropped bit 4 and pointed its work at majority-chain block 964,668, which our archival node holds. It went back to Bitcoin rather than on to the chain that carried BIP-110 forward.

Signalling flips

Only pools with a tracked endpoint that changed signalling state appear below.

Endpoint summary

Download the data

The summary below is the exact JSON this page renders. The sanitized CSV contains one row for each of 2,733,928 observed mining.notify jobs. Raw authorization frames, payout addresses, job IDs, coinbase templates, merkle branches, connection identifiers, and network addresses are not published.

Summary JSON97 KB, per-endpoint counts and flips
Sanitized job CSV24 MB gzip, 2,733,928 rows
Schema and interpretation notesplain text
SHA-256 checksumsverify both data files

Released under CC0 1.0. Job counts measure endpoint messages, not hashrate, votes, or proof of enforcement.