Coinbase Maps Bitcoin’s Post-Quantum Security Path as It Holds 5% of Supply

Coinbase, which custodies roughly 5% of all bitcoin in existence, has published its technical priorities for moving the network to post-quantum security, warning that the transition will be a “challenging, complex, and multi-year process.” The exchange laid out its thinking in a blog post that frames quantum resistance as more than a choice of signature scheme. It must also protect already-exposed and newly created funds, fit Bitcoin’s scarce block space, and keep working inside institutional custody. The timing is deliberate.