Will Bitcoin replace SHA-256 before 2027?

Bitcoin has used SHA-256 as its proof-of-work hash function since the genesis block in 2009. Changing it requires every miner, node, exchange, and wallet in the ecosystem to coordinate a consensus-level protocol change simultaneously — the kind of upgrade that Bitcoin's culture of ossification and deliberate conservatism treats as a last resort rather than a scheduled improvement. The YES case requires not just agreement that SHA-256 should eventually be replaced, but a demonstrated, live cryptographic break severe enough to force emergency action across an ecosystem with hundreds of billions of dollars in SHA-256-specific ASIC hardware already deployed. Miners who have invested in that hardware have the strongest possible financial incentive to resist any change that renders it obsolete — and miners are among the most influential constituencies in any Bitcoin consensus discussion. The quantum computing argument is the only serious near-term catalyst anyone advances for SHA-256 replacement, and researchers consistently frame that threat as distant rather than imminent. More importantly, the quantum discussion within Bitcoin's technical community typically prioritizes signature schemes and address formats as the first upgrade targets — SHA-256 proof-of-work is considered more quantum-resistant than the elliptic curve cryptography used in Bitcoin's signature system. Even under an accelerated quantum threat scenario, the SHA-256 replacement would come after other cryptographic upgrades, not before them. Bitcoin's historical upgrade process is the honest base rate. The SegWit upgrade took years of debate and a contentious fork before activation. The Taproot upgrade required similar multi-year consensus building. A change as fundamental as replacing the proof-of-work hash function would require more deliberation, not less — and would need to happen on a timeline measured in years, not months. Bottom line: This contract prices an emergency scenario where SHA-256 is demonstrably broken and the entire Bitcoin ecosystem rallies around a rapid, radical fork before 2027 — the opposite of Bitcoin's documented upgrade culture. Watch for any credible cryptographic research demonstrating a practical SHA-256 attack as the only development that would move this contract meaningfully, understanding that even that discovery would trigger years of debate rather than immediate action.