Coinbase, which holds 5% of all bitcoin, wants the quantum fix started now

Coinbase is urging the Bitcoin community to begin addressing quantum-computing risks now, arguing that migration to quantum-resistant cryptography could take years. The concern is that sufficiently capable quantum computers might threaten existing Bitcoin signatures and expose vulnerable funds, though no such capability is currently known to exist. Coinbase’s reported custody of about 5% of bitcoin gives its position added weight, but any fix would require broad coordination across the network.