A technical debate erupted on X after on-chain analyst Willy Woo printed what he referred to as a “DUMMIES GUIDE TO BEING QUANTUM SAFE,” urging Bitcoin holders emigrate cash away from Taproot addresses (bc1p) to SegWit bc1q or older P2PKH/P2SH codecs and to keep away from spending till post-quantum protections can be found.
How To Make Bitcoin “Quantum-Safe”
“In the past it was about protecting your PRIVATE KEY (your seed phrase). In the age of big scary quantum computers (BSQC) that are coming, you need to protect your PUBLIC KEY also. Basically a BSQC can figure out your private key from a public key. The present day taproot addresses (the latest format) are NOT safe, these are addresses starting with “bc1p” they usually embed the general public key into the tackle, not good,” Woo wrote on Nov. 11.
His argument hinges on a well-understood distinction in Bitcoin script sorts: Taproot (P2TR) encodes a public key immediately within the output and tackle, whereas legacy codecs like P2PKH/P2SH and SegWit P2WPKH hash the general public key and reveal it solely when cash are spent. That architectural distinction issues in a future the place a sufficiently highly effective quantum pc may derive a non-public key from a revealed public key. Independent references observe that P2TR certainly carries a public key within the output, whereas P2PKH conceals it till spend time.
Woo’s interim playbook is blunt: transfer UTXOs to bc1q (or “1”/“3”) addresses, proceed receiving to that tackle, however “NEVER send BTC out of it” till Bitcoin ships a quantum-resistant upgrade—at which level holders ought to transfer throughout low congestion, minimizing the window during which a public secret is uncovered within the mempool: “Send your BTC into the new quantum safe address when the network is NOT congested, once you send, you reveal the private key for a short time. It’s unlikely a BSQC will steal your coins in that short window.”
He additionally warned that P2PK “Satoshi-era” outputs are most in danger and instructed that misplaced cash with prior spending historical past could possibly be weak. “Satoshi’s 1M coins using an ancient P2PK address will be stolen (unless a future softfork freezes them),” he wrote, including that ETFs, treasuries, and trade chilly storage “can be quantum resistant if the custodians take action” effectively earlier than any gentle fork.
Woo characterised trade expectations as “2030 onwards” for the arrival of “Q-Day,” whereas stressing that requirements for quantum resistance are already rolling out throughout the broader cryptography area.
Former Bitcoin Core maintainer Jonas Schnelli agreed with the hygiene however pushed again on the framing. He referred to as Woo’s plan a prudent mitigation for unspent cash—“P2PKH gives you years of protection while Taproot exposes your pubkey immediately”—but rejected the time period “quantum safe.”
In Schnelli’s view, the second any spend is broadcast, “your pubkey hits the mempool. A quantum attacker could crack your key and RBF double-spend before your transaction confirms (~10 minutes).” He concluded: “It’s a smart precaution, not a permanent solution.”
At press time, BTC traded at $104,693.
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