Custodian Migration

Overview

Custodian Migration is the structured transfer of assets, records, access arrangements, and operating processes from one custodian to another. Custody must be evaluated through technical control, legal responsibility, account structure, operational capability, and customer rights. Possession of keys is important, but it is not the only measure of ownership or asset protection.

It is broader than a single cross-custodian transfer because it may involve many accounts, networks, policies, APIs, and historical records. It should be distinguished from Proof of Control, Proof of Reserves, and Custodian. These concepts may interact in one workflow, but they identify different control points, records, or security assumptions.

Operationally, migration plans inventory balances, open activity, addresses, whitelists, users, reports, tax lots, cutovers, test transfers, and rollback procedures. A production implementation should preserve the applicable blockchain network, asset or contract identifier, source and destination ownership, policy version, responsible roles, timestamps, transaction identifiers, and evidence used to authorize or reconcile the action. Exceptions should be visible in an operational queue rather than silently corrected.

The principal risk is that rushed migration can produce missed deposits, duplicate records, wrong destinations, frozen withdrawals, or incomplete evidence of ownership. Teams should test normal and exceptional paths, including delayed confirmations, reorgs, unavailable custodians, signing-device failure, stale permissions, incorrect network selection, fee spikes, duplicate requests, compromised user interfaces, and incomplete recovery data. High-value actions should be independently reviewed before execution.

For governance and audit, document the exact meaning of Custodian Migration in the relevant wallet, custody platform, smart contract, or internal ledger. Confirm who can create, change, approve, pause, reverse, or recover the associated configuration. Monitoring should cover privileged access, policy changes, address and key lifecycle events, balance movements, failed transactions, reconciliation differences, and unresolved customer claims. This converts the term from a product label into a testable operational control.