NEW: Ledger CTO Charles Guillemet says a Bitcoin quantum migration is a years-long coordination problem, not an overnight hardware event.
He reviewed the SHRINCS draft BIP, a SHA-256 hash-based scheme with 48-byte public keys.
Stateful signatures run 548 to 4,619 bytes versus 64 to 72 today.
The stateless fallback is 5,777 bytes.
Signing on current secure hardware could take minutes.
He argues the harder fight is consensus over dormant coins whose keys never hit the chain.
He reviewed the SHRINCS draft BIP, a SHA-256 hash-based scheme with 48-byte public keys.
Stateful signatures run 548 to 4,619 bytes versus 64 to 72 today.
The stateless fallback is 5,777 bytes.
Signing on current secure hardware could take minutes.
He argues the harder fight is consensus over dormant coins whose keys never hit the chain.
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