Inheritance Handover Planning
Coordinate a witnessed rehearsal so your executor or adult child can complete a supervised unlock before it becomes urgent.
Read detailsSeoul · Est. 2019
Cold storage deserves a calendar, not a crisis
File Brook Line schedules and documents periodic offline wallet access checks for households holding hardware wallets, paper backups, and multi-signature arrangements across Seoul and greater metropolitan area.
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The problem
Keys go untested for years
Most cold-wallet holders assume their seed phrase still works. They discover otherwise only during an emergency transfer, an inheritance handover, or a firmware update that bricks an old device.
Our approach
Scheduled, witnessed checks
We book recurring access sessions at our Mapo office or your premises. Each visit produces a dated log: device serial, passphrase entry confirmed, test transaction hash, and next due date stamped in your custody binder.
Who we serve
Households with real holdings
Clients include expatriate families, small business treasuries, and parents documenting wallet access for adult children. We work in English and coordinate with Korean counsel when inheritance planning requires it.
Verifications
What we verify on each visit
Quarterly Access Verification
A witnessed session confirming your hardware wallet unlocks, signs a test transaction, and matches your recovery documentation.
Read details
Recovery Documentation Session
Draft a step-by-step recovery binder for heirs, co-signers, or executors who may need to access wallets without your presence.
Read detailsFrom the journal
Field notes on custody discipline
14 November 2025
Why Quarterly Beats Annual for Hardware Wallet Checks
Firmware updates, passphrase drift, and backup degradation happen faster than most holders expect. A quarterly rhythm catches problems while they are still reversible.
3 September 2025
What Belongs in a Recovery Binder — and What Does Not
A custody binder should guide an executor without becoming a theft target. We outline the line between useful documentation and dangerous exposure.
Client account
After three years without touching our Ledger, my wife and I booked a quarterly check. The technician caught a passphrase we had written down incorrectly — same words, wrong order. That alone justified the retainer.— M.K., Gangnam, hardware wallet since 2020
The documentation binder is thorough, though I wish the first session had been longer. We needed a second hour to cover our second device. Still, the follow-up visit was included at no extra charge.— R.T., Yongsan, multi-sig household
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