Bitcoin News: Quantum Countdown, The Data Behind the ‘20% Vulnerable’ Bitcoin Supply
Bitcoin News: New Glassnode data places 4.12 million BTC at quantum danger from behavioral components alone, tackle reuse, partial spending, and custody practices, greater than double the 1.92 million BTC uncovered by Bitcoin’s older script structure.
Combined, the two classes cowl 30.2% of all issued Bitcoin, however the extra pressing discovering is that this: the dominant supply of in the present day’s Bitcoin quantum danger will not be legacy code. It is how holders handle their keys.
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Bitcoin News: Two Categories of Exposure. Why Structural and Operational Risk Are Not the Same Thing
Glassnode splits quantum-exposed provide into two distinct buckets, and conflating them produces precisely the form of obscure, unhelpful headline that obscures the place the actual danger is concentrated.
Structural publicity covers outputs the place the public key seems on-chain by design, baked into the protocol itself, not the results of consumer habits.
The major offenders are Pay-to-Public-Key (P2PK) outputs, the script kind utilized in Bitcoin’s earliest blocks, the place the public secret is embedded straight in the UTXO with no hash layer in any respect.
Also included: naked multisig outputs and, extra just lately, Pay-to-Taproot (P2TR) outputs, which expose the public key at relaxation as a part of their design. Glassnode estimates structural publicity at 1.92 million BTC.
Operational publicity is a special drawback. Address varieties like Pay-to-Public-Key-Hash (P2PKH) and Pay-to-Witness-Public-Key-Hash (P2WPKH) don’t expose public keys by default; they disguise them behind cryptographic hash features (SHA-256 and RIPEMD-160) which might be thought-about quantum-resistant below present fashions.
A quantum laptop operating Shor’s Algorithm can derive a non-public key from a recognized public key in polynomial time utilizing ECDSA’s elliptic curve construction. But it can’t reverse a hash to find the public key in the first place. The hash layer is a real safety, till it isn’t.
The safety breaks the second a holder spends from a P2PKH or P2WPKH tackle. Spending requires broadcasting a transaction that features the public key in the signature, and as soon as that transaction is confirmed on the blockchain, the public secret is completely on-chain.
If that tackle then receives extra funds, tackle reuse, these funds are actually uncovered in precisely the identical manner as a P2PK output. The hash layer protected the cash till the tackle was spent from. After that, it protects nothing for any remaining or subsequent stability.
Glassnode places operationally uncovered provide at 4.12 million BTC, 2.1 instances the structural determine. The agency’s conclusion is direct: “The principal perception is that almost all present at-rest publicity will not be merely a legacy script-design drawback, it’s a key- and address-management drawback.”
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