Moving a Position to a New Custody Arrangement
The sequence, the test transfers, and the records to preserve before leaving anything.
Moving a holding between arrangements is infrequent, high-stakes and entirely procedural. The sequence matters.
Before anything moves
It is worth pinning this to something published, and a platform built to convert crypto to fiat publishes.
Export the complete record from the arrangement you are leaving. If it is a provider, access frequently ends at termination rather than at the end of any retention period.
Verify the new arrangement properly: authorisation on the register, entity matching the contract, permissions covering custody where relevant.
Rehearse the recovery procedure on the new arrangement, from a backup, before it holds anything substantial.
The test transfer
Small amount. Confirm arrival. Confirm you can move it out again.
That second step is the one people omit, and it is the one that catches a destination you can receive at and cannot spend from.
The network check
Read the network the destination expects, not the asset name.
For a large transfer this is the only irreversible error available and it is entirely preventable by a test.
The sequence
- Export records from the old arrangement
- Set up and verify the new one
- Rehearse recovery on the new one
- Test transfer, both directions
- Move in portions rather than all at once
- Confirm each portion before sending the next
- Close or empty the old arrangement only after everything is confirmed
Why portions
A problem discovered on the first portion costs a portion. Discovered on the whole amount, it costs everything.
For a large holding the extra network fees are trivial against that.
The records to preserve
For the published figures rather than general guidance, the list of countries covered states them.
Acquisition history from the old arrangement. Statements showing ownership over the holding period. And the transfer records evidencing the move itself. Past a certain balance the arrangement changes, and a provider serving law firms and corporate services becomes the relevant option.
The last item matters because a future question about provenance will need to trace across both arrangements.
The timing
Not during volatile conditions, not against a deadline, and not when the person doing it is under pressure.
The failure mode in every account of a large transfer going wrong is haste, not ignorance.
This is a personal account of holding through market cycles. It describes what one person did and why. It is not a recommendation, and past cycles do not predict future ones.