Bitcoin inheritance: what to preserve

Bitcoin is the most common self-custody asset in an estate, and it behaves differently from exchange balances. Understanding what the artefacts actually are determines what can be preserved and what cannot.

The artefacts

• Seed phrase (recovery words), the 12, 15, 18, 21 or 24 words from which the keys are derived (BIP-39). Whoever holds the words can derive the keys. Found on paper, metal, or in a password manager.
• Private keys / extended keys, older wallets may hold keys directly (wallet.dat files, exported keys). Not standard practice today but common in older estates.
• Hardware wallet, the device that keeps keys offline. The device alone is not the funds; without its words (or a valid passphrase) the estate may have a vault it cannot open.
• Software wallet files, desktop/mobile wallet data, browser wallets, wallet.dat from legacy clients.
• Passphrase, an extra word or phrase on top of the seed (BIP-39 passphrase). Without it, the seed phrase alone is insufficient. Heirs rarely know it exists.

What Bitcoin inheritance involves

• No customer support. There is no exchange to call for self-custody Bitcoin. The estate’s access depends entirely on what was left behind.
• Keys, not accounts. Ownership is proven by keys, and possession of a device is not possession of the keys.
• UTXO reality. Funds sit in outputs controlled by keys; a “balance” is an interpretation of the chain, not a ledger line (see why a wallet balance proves nothing).
• The wrong move is irreversible. One reset, one firmware update, one batch of wrong guesses can lock or destroy the only access.

The inheritance sequence

1. Preserve everything exactly as found, devices, papers, drives (preservation checklist).
2. Identify the artefacts, is it an exchange account, a hardware wallet, words, a file? (what did I find?)
3. Establish authority before attempting anything (legal authority vs technical access).
4. Only then plan access, and if access is genuinely blocked, read wallet recovery: what is realistically possible before contacting anyone.

Planning ahead

If you own Bitcoin, the standards to plan around are the same ones in crypto inheritance planning and, for multi-key setups, bitcoin multisig inheritance.

What matters

• The words matter more than the device. A hardware wallet without its recovery words is a vault the estate may not be able to open; the words alone can rebuild the wallet anywhere. Keep the device and the words as two separate secrets.
• The passphrase is the hidden variable. If a passphrase was set on top of the seed (BIP-39), the seed alone opens a different, usually empty, wallet. Heirs rarely know it exists, preserve any separate note or hint.
• A visible balance is not access. A watch-only wallet or a block-explorer page shows funds but cannot spend them (why a wallet balance proves nothing).
• The seed standard matters. BIP-39 (12, 15, 18, 21 or 24 words) and SLIP-39 (shares) describe how the words restore the wallet; knowing which standard was used is part of the access picture (wallet recovery: what is realistically possible).