Wiki / People / James Hilliard

James Hilliard

From the Bitcoin Takeover Wiki · ✓ 5 sources · 0 podcast anchors · built 2026-11-13

Author of BIP-91, the reduced-threshold SegWit activation that locked in in July 2017.

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The wiki's angle: Hilliard wrote the compromise that let miners avoid the UASF chain split in 2017; the Fork Wars timeline lists him among the key actors of SegWit activation.[3]

Contents

  1. BIP-91
  2. Hong Kong and GitHub
  3. References

BIP-91

BIP-91, “Reduced threshold Segwit MASF”, lists James Hilliard as its author[1][2]. Bitcoin Takeover's Fork Wars timeline calls it “A miner-friendly compromise” that used a lower threshold, 269 of 336 blocks, and says it locked in on 21 July 2017 and activated on 26 July[3]. See BIP-91.

Hong Kong and GitHub

The February 2016 Hong Kong Roundtable statement lists a James Hilliard as “Pool/Farm Admin” at BitmainWarranty[4]. This wiki has not confirmed that the signer and the BIP-91 author are the same person[4]. His GitHub account, jameshilliard, dates from January 2013[5].

References

  1. primaryBIP-91 (Reduced threshold Segwit MASF) [archived]
  2. primarybitcoin/bips README (BIP index with authors) [archived]
  3. btkFork Wars: the block size war timeline (Bitcoin Takeover) [archived]
  4. primaryBitcoin Roundtable, “Bitcoin Roundtable Consensus”, Medium, 20 Feb 2016 (Wayback Machine copy)
  5. primaryGitHub profile jameshilliard (James Hilliard), account created 17 Jan 2013 [archived]

Related

BIP-91 (reduced-threshold SegWit signalling)
James Hilliard's 2017 miner-enforced bridge: an 80% vote over 336 blocks that made miners reject blocks not si
UASF (BIP-148)
The 2017 user-activated soft fork that threatened to reject non-SegWit-signalling blocks from 1 August 2017.
Segregated Witness
The 2017 soft fork that moved signatures out of the legacy block, fixed malleability and became the centre of
Hong Kong Roundtable
The February 2016 meeting where miners and some Core contributors agreed SegWit first, then a roughly 2 MB har
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