It depends on what you want to stop depending on. On an exchange you hold a claim on one company; every era of the failure registry includes that loss. If you will not hold a key yourself, the destinations are a qualified custodian (one regulated institution, segregated accounts) or multi-institution custody (several institutions, none able to move funds alone). Collaborative multisig fits only if you will hold a key. The columns to read before moving: who can move funds at the destination, insurance and its basis, and the incident history. Withdraw in full and confirm on-chain before closing the account.
Fit engine rules 0.1 (1 Nov 2026), with this situation's inputs preset. Adjust the inputs to your own case. Proof of Custody is published by Onramp Bitcoin, which appears here where its custody model fits and is scored by the same methodology as every other platform.
Recovery: Locate the devices and seed backups, run a signing ceremony with the provider's key; or, where the provider documents an assisted inheritance path, follow that path with the provider.
Recovery: Identity and authority documents to the institutions; no device, seed or ceremony on the heir's side.
Recovery: Locate the quorum of devices and backups, reconstruct the wallet descriptor, sign. Entirely on the recoverer.
Recovery: Find the seed phrase, restore it on a compatible device. Fails silently if the seed is lost or the recoverer cannot do this.
Recovery: The brokerage's beneficiary or estate process; no keys involved.
Recovery: Identity and authority documents to the custodian; the custodian's own succession procedure.
These are custody models that fit the situation described, by Proof of Custody's published rules, version 0.1 (1 Nov 2026). They are not a recommendation to buy, sell, move or hold anything, and not legal, tax or estate advice.
A family office holds bitcoin on a trading venue and wants professional custody without adding operational work internally.
Agent tool: fit_custody_setup. Primary sources: poc-scores, poc-incidents. Refresh: scores monthly. All routes.
Free, read-only, no key. Every answer carries its source URL, as-of date and the publisher disclosure.