QuantumBitcoinCrypto

Bitcoin Cash Proposal Seeks Path to Quantum-Resistant Transactions

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 05/11/2026, 10:49:24 UTC.

Briefings

Bitcoin Cash developers formalized CHIP-2026-06 to introduce OP_SIGHASH, a post-quantum and hybrid signature opcode targeting November 2026 lock-in and May 2027 activation. The proposal simplifies contracts by exposing transaction sighash calculations already performed by the Bitcoin Cash virtual machine, reducing script complexity from hundreds of bytes to two bytes while preserving address compatibility and wallet tools.

Key points

• The Bitcoin Cash development community formalized CHIP-2026-06, a Cash Improvement Proposal introducing the OP_SIGHASH opcode.
• The proposal targets November 15, 2026 lock-in and May 15, 2027 activation, with mainnet activation scheduled for May 15, 2027.

Context

Bitcoin Cash (BCH) is implementing a post-quantum migration path through the CHIP process. The proposal extends the Bitcoin Cash virtual machine's check-signature opcodes to support multiple signature schemes, including post-quantum algorithms and hybrid combinations, ensuring compatibility with existing address formats and wallet tools.

Limitations

Evidence covers the formalization and technical design of CHIP-2026-06, but does not include community feedback data, wallet adoption metrics, or node implementation status prior to the November 2026 lock-in.

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