The inventory letter. Minimum viable plan, one page, stored with your estate documents: what exists (coins, chains, rough amounts), where it lives (exchange accounts, hardware wallets and their physical locations), and who to call. No keys, no passwords. This alone prevents the most common failure, which isn’t locked coins. It’s coins nobody knew existed, thrown out with the junk drawer.
Sealed instructions, stored right. The access details themselves, seed phrase location, PINs, passphrase, in a sealed envelope or on a steel backup, held somewhere with real physical security: a home safe your executor can reach, or an attorney’s vault. A bank safe deposit box works but comes with a catch worth knowing: boxes can be sealed at death until the executor is formally appointed, adding weeks. Fine for coins. Know it going in.
Split the secret. For larger holdings, don’t let one envelope be the single point of failure. Multisig wallets require, say, two of three keys to move funds, so you can hold one, your heir another, your lawyer a third, and no single stolen envelope or faithless party can drain it. Collaborative custody services and inheritance products from established wallet companies productize exactly this, including dead-man’s-switch designs. Complexity is the tradeoff: your heirs must be able to operate whatever you build. A vault your family can’t open is just a slower version of losing the keys.
Exchange accounts: easier, with fine print. Coins held at a major exchange are recoverable the traditional way. Major platforms have deceased-customer processes: death certificate, probate documents, and the estate gets the assets. Slower than a beneficiary form and paperwork-heavy, but real. The tradeoff is the one crypto people tattoo on themselves, not your keys, not your coins, plus exchange failure risk. Choose which risk you’d rather carry.
Grant the legal authority. Nearly every state has adopted a version of RUFADAA, the law governing fiduciary access to digital assets, and your will, trust, and power of attorney should include explicit digital asset powers so your executor can legally deal with exchanges and devices. Understand what the law does and doesn’t do: it grants authority, not access. It can compel a company to cooperate. It cannot compel a blockchain to do anything. The keys still rule.