Wiki / Forks / Bitcoin Private

Bitcoin PrivateBTCP

From the Bitcoin Takeover Wiki · ✓ 4 sources · 0 podcast anchors · built 2026-11-13

A 2018 “fork-merge” that combined a Bitcoin UTXO snapshot with Zclassic's chain, then went offline in October 2020.

◆ Takeover vieweditorial · opinion, labelled

The wiki's angle: the only fork in this batch built from two parents at once, and a warning about small Equihash chains: it was 51% attacked on a livestream within eight months.[2][4]

Contents

  1. Fork-merge
  2. Design
  3. Attack and shutdown
  4. References

Fork-merge

The project's README describes Bitcoin Private as “a fork of Zclassic, merging in a snapshotted UTXO set of Bitcoin”[1]. BitcoinWiki dates the fork to 28 February 2018 at Bitcoin block 511,346 and Zclassic block 272,991, with holders of both coins receiving BTCP 1:1[2]. Bitcoin block 511,346 has a header time of 28 February 2018, 17:06:58 UTC[3].

Design

BitcoinWiki describes a 21 million coin supply with 2 MB blocks every 2.5 minutes using Equihash, the Zcash-family algorithm[2]. Its developer was Rhett Creighton, creator of Zclassic[2].

Attack and shutdown

news.Bitcoin.com reported that on 13 October 2018 someone using the name Geocold livestreamed what they presented as a 51% attack on Bitcoin Private after gaining majority hashrate[4]. The project's legacy repository now opens with the notice “10/8/2020 - Current chain offline - New code and chain coming soon”[1].

References

  1. primaryBTCPrivate/BitcoinPrivate-legacy README (GitHub) [archived]
  2. secondaryBitcoinWiki (bitcoinwiki.org), “Hardfork Bitcoin Private” [archived]
  3. primarymempool.space, Bitcoin block 511,346 (header time 2018-02-28 17:06:58 UTC) [archived]
  4. secondarynews.Bitcoin.com, “Hacker Livestreams 51% Attack on Bitcoin Private”, 14 Oct 2018 [archived]

Related

Zcash
The 2016 shielded-payments chain built on the Zerocash research — “the privacy upgrade Bitcoin never accepted”
Bitcoin Gold
The October 2017 fork that switched to GPU-mined Equihash, and later suffered repeated 51% attacks.
Bitcoin Diamond
A November 2017 airdrop fork that paid 10 BCD per BTC, changed proof of work and set aside 40 million coins fo
Categories: Forks · Fork lineage
Ask about this article: >_ terminal · Onion mirror: http://btctkvroa6xsq25wmpvvlpkcgss7724zk6fm765fvtuunfgxw74j2pyd.onion/wiki/bitcoin-private/
>_ ask the wiki