Ethereum's post-quantum migration timeline creates operational and regulatory pressure that could disrupt validator participation and staking if banks fail to prepare adequately by 2027.

"A bank beginning its inventory in 2027 would be roughly on time for a 2029 target. Put those steps in series, and the arithmetic alone produces a multi-year timeline."

"Brunner's sequence for how a bank runs into trouble starts with the audit itself. If the signature scheme underneath a bank's custody process moves to something new but its documented controls have not been redesigned and retested, the attestation no longer describes what the bank is doing."