20 sats \ 1 reply \ @go 26 Apr 2022 \ parent \ on: Fidelity to Allow Retirement Savers to Put Bitcoin in 401(k) Accounts bitcoin
It has to be a custody service, via a third party I would guess. Probably Paxos or something similar.
From the Bitcoin Magazine article linked to in a separate reply:
Bitcoin in the proprietary DAA will be held in the Fidelity Digital Assets custody platform in a measure meant to provide institutional-grade security.
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