Ripple CTO Emeritus David Schwartz has joined a debate over why Coinbase, Kraken and Trezor have not embraced Bitcoin BLAKE2b, a separate chain that emerged from Bitcoin and uses the BLAKE2b mining algorithm instead of Bitcoin's traditional SHA-256. Users have questioned the contrast with earlier support for Bitcoin forks such as Bitcoin Cash and Bitcoin SV. Schwartz suggested exchanges may be relying on replay protection (safeguards preventing cross-chain transaction reuse) because a newly split asset can share Bitcoin's pre-fork transaction history, creating engineering risks that could lead to losses if transactions are processed on both chains.