Verified timeline

Events from BIP 110 through BLAKE2b mainnet

Exact dates, heights, hashes, tags, and source links track the proposal, chain split, release candidates, BLAKE2b activation, and first production release.

24 Oct 2025

Initial BIP 110 draft recorded

The first draft appears in the official BIP repository changelog.

Verified

3 Dec 2025

BIP 110 assigned

The Reduced Data Temporary Softfork proposal receives BIP number 110.

Verified

25 Jun 2026

Proposal advanced to Complete

The status change is recorded in the official BIP repository.

Verified

8 Aug 2026
Height 961,631

Last shared Bitcoin block

Hash 00000000000000000000807f9dc917442a67910426d79ebb2f8aa2149327ce8a is present in both histories.

Verified

8 Aug 2026
Height 961,632

The block histories diverge

Bitcoin mainnet and the BIP 110 enforcement branch accept different blocks at height 961,632.

Verified

9 Aug 2026

BIP 110 marked Closed

The changelog cites the chain split and stalled mining.

Verified

12 to 28 Aug 2026

Intermittent SHA-256d branch mining

The enforcement branch advances through height 961,639, which becomes its final SHA-256d block.

Observed

15 Aug 2026

BLAKE2b proof-of-work implementation opened

Bitcoin Knots PR #359 publishes the version-2 header and BLAKE2b implementation for review.

Development

21 Aug 2026
Testnet4 149,460

RC1 testnet activation

A BLAKE2b test chain forms and is later superseded.

Superseded

22 Aug 2026
Testnet4 149,537

RC2 testnet activation

The second signed candidate activates and is later superseded by RC3.

Superseded

27 Aug 2026
Testnet4 150,027

RC3 signed testnet tag

The third candidate moves the testnet4 activation boundary before mainnet parameters are introduced.

Superseded

30 Aug 2026
Height 961,640

BLAKE2b mainnet activated

RC4 sets the mainnet transition height and the first version-2 BLAKE2b block is mined at 06:14:39 UTC.

Active

1 Sep 2026

RC5 retained the live chain

The signed candidate preserves height 961,640 and adds mainnet transition checkpoints.

Verified

2 Sep 2026
19:02 UTC

First production mainnet release

Bitcoin Knots 29.4.1.knots20260508 ships with the BLAKE2b mainnet consensus changes and opt-in unified signature hash.

Released

Current

Explorer and operational infrastructure

Mempool.Guide provides Bitcoin BIP110 block, transaction, and address exploration. Additional wallet, custody, and exchange services can be documented as they become verifiable.

Operational