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Bitcoin Keeper is a mobile app that guides users from a single-sig hot wallet up to long-term, multisig cold storage and inheritance planning. It supports ten major hardware wallets via QR, file, NFC, or a companion desktop app for USB connections.
Bitcoin Keeper's multisig setup uses encrypted 'magic links' stored briefly on its servers for collaboration. Users can share keys, wallet descriptors, or partially signed transactions via these links, QR codes, or files.
Bitcoin Keeper uses Miniscript for inheritance, allowing users to add a time-locked 'inheritance key' that activates after a set period, turning a 2-of-3 multisig into a 2-of-4 or enabling a single-key emergency spend.
Ben Kaufman explains Bitcoin Keeper's inheritance uses absolute time locks set to a future date, not relative locks. Users must create an on-chain transaction to renew the time lock, which the app automates but requires a backup update.
Bitcoin Keeper monetizes via a subscription tier model: a free tier offers core features, while paid tiers start at $15/month for automated backups, Miniscript, inheritance planning, and a server-key option with spending limits.
Bitcoin Keeper supports USDT on Tron, using a BIP85 child seed from the user's main backup and a service called 'gasfree' to pay fees in USDT. The team plans to add swap functionality and support more chains based on demand.
Odell notes Argentina's black market has dollarized into Tether on Tron, and Trust Wallet dominates globally due to its Tether support, creating an opportunity for Bitcoin Keeper to attract international users with strong Bitcoin features.
Bitcoin Keeper omits Lightning support to focus on long-term savings, reasoning users should separate spending and storage wallets. Ben Kaufman has not deeply explored self-custody Lightning solutions like Spark or Arc.
Bitcoin Keeper is building a contacts feature to enable in-app messaging for collaboration and future social recovery. Ben Kaufman views its current Miniscript inheritance as a form of social recovery where trusted parties hold time-locked keys.