Sign a spend with Sparrow: Sparrow is a mature, open-source Bitcoin wallet for desktop. If you are not using Fountain, this is the usual way to sign a SignBit transaction with your own key.
Use a Ledger or Trezor: Hardware wallets work with SignBit today. Sparrow talks to the device; SignBit never does. Your key stays on the device and confirms every transaction on its own screen.
Sign with Fountain: Fountain is the free SignBit signing app for Windows, macOS, Linux, and Android. It holds your keys and signs completely offline; it never makes a network call.
Check a receive address is really yours: Before you receive anything significant, confirm the address SignBit shows you genuinely belongs to your vault. You can do this yourself, offline, without trusting our display.
Recover your bitcoin without SignBit: If SignBit is unreachable, or gone for good, your bitcoin is still yours and still spendable. Your vault is standard Bitcoin multisig, so you need no SignBit account, no SignBit software and no permission from us. This guide is worth reading before you need it.
Recover a vault in Electrum: Rebuild your vault in Electrum from your own seed words and spend from it without SignBit. Do this once as a drill, so you know it works before you ever need it.
Recover a vault in Sparrow: Load your vault into Sparrow from its backup file, add your own keys, and spend from it without SignBit. Do this once as a drill, so you know it works before you ever need it.
Plan for your heirs: If something happens to you, your family needs to know the vault exists and to be able to reach it. SignBit helps you write both down, and if it comes to it we can add the one signature that lets your heirs finish the job. Nothing runs on a timer and nothing assumes you have died. The conditions are set out below, and you can stop the whole thing with one click.
Claim a vault you have inherited: This guide is for someone who holds keys to a vault whose owner has died and needs help with the last step. It is written for a stranger, so you do not need a SignBit account and you will not be asked to create one. Read the first step before anything else, because you may not need us at all.
Set a spending policy: A policy limits what can be spent from a vault. It is enforced by the SignBit signing service, which keeps its own copy of the rules and checks every transaction against them, so it binds any spend that needs a SignBit signature to go through. Where your own keys already meet the threshold, you can spend without us, and the rules are a record rather than a control.
Locked out of two-factor: What to do when you can't reach your authenticator app, with or without your backup codes.