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How to take Bitcoin off exchanges and into your own custody — hardware wallets, multisig, steel seed backups, geographic key distribution, inheritance planning and recovery drills.
Source: https://irishhodler.com/self-custody
If your Bitcoin is on an exchange, you don't own it — you own an IOU. Mt. Gox, FTX, Celsius, BlockFi and Voyager all proved that custodial promises evaporate the moment a balance sheet breaks. Step one is accepting that custodial risk is the single largest threat to your stack.
Use a purpose-built signing device — Coldcard, Trezor or BitBox02 are the most reviewed open-source options. Buy direct from the manufacturer, never from a marketplace reseller, and verify the tamper-evident packaging on arrival. Treat the device as a signer only.
Initialise the device disconnected from any computer. Write the 12 or 24 words by hand, then copy them onto a steel backup. Paper burns and ink fades — steel survives a house fire. Never photograph the seed, never type it into a browser, never store it in a password manager or cloud drive.
Once your stack is meaningful, single-signature is no longer the right tool. A 2-of-3 multisig setup splits signing power across three devices so no single key can move your coins. Collaborative custody services such as Casa, Unchained and Nunchuk hold one key while you control the other two.
Keep signers and steel backups in physically separate locations: home safe, a trusted family member, a deposit box in a different jurisdiction. A fire, a burglary, or a single bad actor should never reach a quorum of keys.
Don't post screenshots of balances or link your real name to on-chain addresses. Use a fresh receive address for every deposit. Consider running your own node (Umbrel, Start9, or Sparrow with a Bitcoin Core backend) so you stop leaking addresses to third-party servers.
Your family should be able to recover the coins without being able to spend them today. Write a plain-language recovery letter covering where each key and steel plate is stored, the device model, and which co-signer to contact. Pair it with a will.
An untested backup is not a backup. At least once a year, restore your seed onto a wiped device and confirm the addresses match. This catches transcription errors, dead batteries and outdated firmware before you actually need the recovery.
If a platform offers yield on your Bitcoin, they are lending it to someone else and the counterparty risk is yours. Rehypothecation, opaque balance sheets and unregulated custodians sank Celsius and BlockFi. Cold storage earns no yield — that's the feature, not the bug.
Self-custody means holding the private keys to your own Bitcoin rather than leaving it with an exchange or custodian. You control the coins directly, so no third party can freeze, lend out, or lose them.
Coldcard, Trezor and BitBox02 are the most widely reviewed open-source signing devices. Buy direct from the manufacturer and check the tamper-evident packaging on arrival.
Write the words by hand, then transfer them to a steel backup plate. Store it somewhere separate from the signing device. Never photograph a seed phrase or store it in cloud storage, a password manager, or a note app.
When the amount you hold is large enough that a single lost or stolen key would be a serious loss. A 2-of-3 multisig removes any single point of failure, at the cost of a more complex setup and recovery process.