Wiki / People / Jeff Garzik

Jeff Garzik

🎙 Bitcoin Takeover guest · 1 episode
From the Bitcoin Takeover Wiki · ✓ 9 sources · 1 podcast anchors · built 2026-11-13

Early Bitcoin Core contributor who proposed a bigger block in 2010 and later led the engineering of SegWit2x.

◆ Takeover vieweditorial · opinion, labelled

The wiki's angle: Garzik appears at both ends of the war in Fork Wars, from the 2010 patch Satoshi answered to the 2017 letter that ended SegWit2x.[3][6]

Contents

  1. The 2010 patch
  2. Proposals
  3. SegWit2x
  4. Other
  5. On Bitcoin Takeover
  6. References

The 2010 patch

On 3 October 2010 Garzik posted a patch to raise the block size limit, arguing “We should be able to at least match Paypal's average transaction rate”[1]. Satoshi Nakamoto replied in the same thread, an exchange the Fork Wars timeline treats as its own phase[2][3].

Proposals

Garzik authored BIP-100, a dynamic block size limit set by miner vote, and BIP-102, a one-time increase to 2 MB[4][5].

SegWit2x

Fork Wars lists Garzik as technical lead of btc1, the SegWit2x client[3]. He was one of six signatories of the 8 November 2017 message suspending the 2 MB upgrade[6].

Other

In 2016 Garzik said the evidence Craig Wright had publicly provided did not prove anything[7]. The Bitcoin Wiki lists him as co-founder of Bloq[8].

On Bitcoin Takeover

Episodes with Jeff Garzik as a guest, from the show's feed (bitcoin-takeover.com/audio/feed.xml).

References

  1. primaryjgarzik, “[PATCH] increase block size limit”, Bitcointalk, 3 Oct 2010 [archived]
  2. primarySatoshi Nakamoto, reply to Garzik's block-size patch, Bitcointalk msg 15139, 3 Oct 2010 [archived]
  3. btkFork Wars: the block size war timeline (Bitcoin Takeover) [archived]
  4. primaryBIP-100 (Dynamic maximum block size by miner vote), Jeff Garzik [archived]
  5. primaryBIP-102 (Block size increase to 2MB), Jeff Garzik [archived]
  6. primaryMike Belshe et al., “Segwit2x Final Steps”, bitcoin-segwit2x mailing list, 8 Nov 2017 (Wayback Machine copy)
  7. secondaryWikipedia, “Craig Steven Wright” [archived]
  8. secondaryBitcoin Wiki (en.bitcoin.it), “Jeff Garzik” [archived]
  9. episodeS15 E70: Jeff Garzik on Hemi & Bitcoin Development [archived]

Related

SegWit2x
The planned 2 MB hard fork that was meant to follow SegWit under the New York Agreement, suspended a week befo
New York Agreement
The May 2017 industry deal to activate SegWit at 80% and hard fork to 2 MB within six months, which became Seg
Craig Wright
Australian computer scientist who claimed to be Satoshi Nakamoto; the UK High Court ruled in 2024 that he is n
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