Which chains split from Bitcoin?
BTC continues on the Bitcoin network. BCH split from BTC on 1 August 2017, mainly over block size. BSV split from BCH in November 2018. A branch in this diagram means a chain split, not a recommendation.
Each fork coin is a separate asset with its own software, market and risks. Holding BTC does not make a fork coin safe to claim or use.
Source: How consensus rule changes work
What is the separate Bitcoin Ecosystem family?
The Bitcoin Ecosystem project describes six chains with different roles. The grouping below reflects its own descriptions. It does not show forks of Bitcoin, and these labels do not verify a live implementation or a security claim.
Source: Bitcoin Ecosystem project
How does the project describe each chain?
The Bitcoin Ecosystem project describes the following roles and supply wording. “21 Million” is reproduced without adding a time period or calling it a total. No supply figure is stated here for BTC1USD.
Bitcoin Reserve / RWA1 (BTCr1)
The Sovereign Reserve / Real World Asset Chain
Project supply wording: 26.6 Million per year
Bitcoin Genesis 1 (BTC1)
The Decentralised Utility & Security Chain (proof-of-work)
Project supply wording: 26.6 Million per year
1Bitcoin1 (1BTC1)
The Scarcity Anchor
Project supply wording: 21 Million
Bitcoin1USD (BTC1USD)
The Stability Layer
No supply figure stated here.
Bitcoin1.ai (BTC1ai)
The Decentralised Intelligence Layer
Project supply wording: 26.6 Million per year
BitcoinQu1 (BTC1q)
The Quantum-Secure Ledger
Project supply wording: 21 Million
Source: Bitcoin Ecosystem project
What can a name or ticker establish?
A name identifies what to investigate. It does not establish shared Bitcoin rules, history, security or endorsement. BTC, BTC1 and 1BTC1 are different labels; verify the exact project and network.
Read BTC1 separately for the difference between a project description and observable evidence.