Bitcoin Clashic (BCHC)
The minority continuation of the original Bitcoin Cash rules after the November 2017 DAA hard fork
Overview
Bitcoin Clashic (also known as BCHC or BCL) is the minority chain that continued mining under the original Bitcoin Cash consensus rules after Bitcoin Cash performed its first major protocol upgrade in November 2017.
On 13 November 2017, at approximately block height 504,031 / 504,032, the majority of the Bitcoin Cash network activated a new Difficulty Adjustment Algorithm (DAA). A small group of nodes and miners refused the new rules and kept producing blocks under the previous ruleset. That minority chain became known as Bitcoin Clashic.
The name is a playful combination of “Classic” and “Clash,” reflecting both the desire to preserve the original Bitcoin Cash rules and the contentious nature of the split.
Chain Lineage
478,558 / 478,559 (1 Aug 2017)→ Bitcoin Cash (BCH)
Bitcoin Cash → ~block
504,032 (13 Nov 2017 – new DAA)→ Majority continued as BCH
→ Minority continued as Bitcoin Clashic (BCHC / BCL)
Later, a portion of the Clashic community performed another upgrade (~block 576,698) that became Bitcoin Core (BTCC).
Why the Split Happened
The original Bitcoin Cash emergency difficulty adjustment (EDA) algorithm, used after the August 2017 fork from Bitcoin, produced highly unstable block times. In periods of low hashrate, blocks could take hours; when hashrate returned, blocks could come every few seconds.
In November 2017 the Bitcoin Cash community activated a new, more stable difficulty adjustment algorithm. Most of the network upgraded. A minority argued that the change abandoned the rules under which Bitcoin Cash had originally forked from Bitcoin and therefore refused to follow the upgrade. Their chain retained the older rules and took the name Bitcoin Clashic.
Technical Characteristics
| Algorithm | SHA-256 (same as Bitcoin / Bitcoin Cash) |
|---|---|
| Origin | Continuation of pre-November-2017 Bitcoin Cash rules |
| Block size | Inherited large-block rules from early BCH (initially 8 MB) |
| Replay protection vs BCH | Weak / incomplete at first (same SIGHASH_FORKID style as BCH). Replay risk existed between the two chains. |
| Replay protection vs BTC | Present (inherited from the original BCH fork) |
| Common tickers | BCHC, BCL |
Later History
Bitcoin Clashic never attracted significant hashrate or exchange support compared with Bitcoin Cash. Over the following months the project remained a small minority chain.
In mid-2018 a further upgrade of the Clashic codebase produced the project that branded itself Bitcoin Core (BTCC) (unrelated to the Bitcoin Core software). That later project introduced 1-minute blocks and other changes and eventually moved toward a rebrand as Title Network.
Because of the multi-step history, simply holding BCH at the November 2017 fork did not automatically give users Clashic (or later BTCC) unless they remained on the minority chain.
Historical Significance
Bitcoin Clashic is a useful illustration of how even “successful” hard forks can immediately produce further minority chains when part of the community rejects a subsequent upgrade. It sits in the middle of the 2017–2018 cascade of Bitcoin-named forks and is the direct predecessor of the deliberately provocatively named Bitcoin Core (BTCC) token.