Buried inside a brand new Bitcoin safety proposal is a provision that might save stragglers from dropping every little thing.
Anybody who misses the improve deadline however nonetheless holds their seed phrase would have a path to restoration via zero-knowledge proof know-how — a last-resort mechanism constructed into the ultimate part of BIP-361, a draft posted to GitHub on Tuesday by cypherpunk Jameson Lopp and 5 co-authors.
The total proposal is a three-phase plan designed to guard Bitcoin from a menace that has quietly grown extra severe: the eventual skill of quantum computer systems to crack the cryptographic keys defending early Bitcoin addresses.
Satoshi’s Fortune At The Heart Of It All
About 1.7 million BTC sits in old-style addresses referred to as P2PK — the sort utilized in Bitcoin’s earliest days. These addresses expose public keys immediately, making them weak as soon as quantum computing reaches ample energy.
Satoshi Nakamoto’s stash alone is valued at roughly $74 billion at present costs. In response to the proposal’s authors, if a foul actor gained quantum entry to these cash, the harm to Bitcoin’s worth and credibility may very well be extreme.
New 3-step technique targets quantum danger. Supply: Github
BIP-361 builds on BIP-360, launched in February, which launched a brand new quantum-resistant tackle format referred to as pay-to-Merkle-root, or P2MR. That earlier proposal protects new cash. BIP-361 tackles what BIP-360 left unresolved — the roughly 34% of Bitcoin’s whole provide nonetheless sitting in weak addresses.
The plan unfolds in phases. Three years after activation, sending BTC to old-style addresses would now not be allowed. Two years after that, old-format signatures could be invalidated fully.
Any cash that haven’t been moved by then could be frozen. The third part — the rescue window — provides late movers a technical path to reclaim funds utilizing proof of seed possession.
BTCUSD buying and selling at $73,722 on the 24-hour chart: TradingView
The Neighborhood Response Has Been Blunt
The proposal landed onerous amongst Bitcoin’s most vocal voices. Bitcoin Journal’s editor rejected it outright. TFTC founder Marty Bent referred to as it “laughable.” Metaplanet’s head of enterprise improvement put the contradiction plainly: “Now we have to steal individuals’s cash to forestall their cash from being stolen.”
The authors anticipated the backlash. Based mostly on their very own framing, the freeze isn’t meant as punishment — it’s described as a protection in opposition to a worse end result. Frozen cash, they argue, barely improve the worth of everybody else’s holdings. Quantum-stolen cash do the alternative.
This quantum proposal is very authoritarian and confiscatory, however in fact, it’s from Lopp. 🚩 🚩
There isn’t a good rationale for forcing the improve and rendering previous spends invalid. Improve needs to be 100% voluntary. pic.twitter.com/tQvJVgdPRY
— Cato The Elder (@CatoTheElder17) April 14, 2026
Protocol developer Mark Erhardt shared the proposal on X, the place pushback got here shortly. Critics referred to as it “extremely authoritarian and confiscatory” and questioned whether or not any deadline may justify making current Bitcoin unspendable by its rightful homeowners. Lopp had not responded to requests for remark on the time of publication.
Whether or not BIP-361 strikes ahead relies on a consensus course of that has traditionally resisted modifications this vital. For now, it stays a draft — and a flashpoint.
Featured picture from PostQuantum, chart from TradingView
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