Bitcoin Cash price in focus as quantum-signature proposal nears review

Bitcoin Cash price is being watched alongside a protocol proposal that could give the network a new route toward post-quantum and hybrid signatures. The proposal is not an activated network rule: developers are still reviewing its design and implementation.

Quantum-signature proposal remains open

According to The Quantum Insider, Bitcoin Cash contributor mainnet_pat introduced CHIP-2026-06, titled Post-Quantum and Hybrid Signatures, in June 2026. The proposal would add an OP_SIGHASH opcode that exposes the transaction signature hash already calculated during verification.

The design would allow a registry of signature schemes, starting with existing secp256k1-based signatures and potentially adding post-quantum schemes such as SPHINCS+ over time. Hybrid keys would require both the classical and post-quantum checks to succeed. The proposal is intended as a migration path and is not described as an immediate replacement for everyday Bitcoin Cash signatures.

Lock-in is separate from activation

The proposal is under active discussion and implementation review for a potential lock-in on November 15, 2026. The same source gives May 15, 2027 as the targeted mainnet activation date. Those are separate milestones: a lock-in would settle the proposal for implementation, while activation would make the new consensus behavior effective only after the remaining development and upgrade process.

The Quantum Insider reports that Bitcoin Cash Node developers have opened a merge request for the opcode. That is a development step rather than evidence that the rule is already live. For investors and users, the immediate significance is therefore the pending review and the possibility of a future upgrade, not a completed change to the network.

Market data and investor context

The Investing.com Bitcoin Cash page displayed BCH/USD at 235.58 USD at the displayed time of 13:47:25. It also showed a market capitalization of 4.75 billion USD, 24-hour volume of 195.26 million USD, a ranking of 18, and circulating supply of 20.11 million BCH against a maximum supply of 21 million.

The displayed page showed a 3.45 percent decline against its own comparison figure, but that figure is not treated here as a verified UTC day-over-day change because the retrieved page did not provide the required dated prior UTC close. With the protocol proposal still pending, the Bitcoin Cash price remains a market indicator rather than proof that traders have assigned a specific value to the upgrade.

More reporting and analysis are available on the Bitcoin Cash topic page.