Collaborative Custody

2-of-3 multisig: you hold 2 keys, they hold 1. They cannot move your bitcoin without you. 100,000+ BTC secured across network. $500M+ loans originated with zero dollar losses. Key agent network includes Coincover, Bakkt, Kingdom Trust.

Built by Block (formerly Square). Named TIME's Best Inventions of 2024 (Privacy & Security). 2-of-3 multisig: you hold 2 keys (mobile app + hardware device), Block holds 1 recovery key (cannot act alone). Fully open-source under MIT license. Available in 95+ countries.

Lloyd's of London Coverholder (AM Best A+ rated). Launched December 2024. Uses Miniscript-powered Trident Vaults.

Founded 2018. Pioneer in consumer multisig. No KYC for membership. Inheritance included in all plans. Casa Enterprise launched 2025 for businesses.

First multi-user multisig wallet. Zero KYC. Famously refused Canadian court order during Freedom Convoy.

2-of-3 multisig vault with keys held by 3 separate institutions (Onramp, BitGo, Coincover). No single entity can move funds. On-chain auditable. Full-reserve model.

The Bitcoin Adviser operates as a non-custodial advisory service, meaning they never hold your Bitcoin or control your keys. Their collaborative custody model uses 2-of-3 multi-signature setups with hardware isolation, on-chain recording, audit trails, and optional video attestation for geographically distributed security. They recommend established hardware wallets like Trezor Safe 3 or Safe 5 for client self-custody implementations.

The firm has been serving Bitcoin clients since 2016 and reports managing advisory relationships covering over $1 billion in Bitcoin assets. They are recognized by Bitcoin Magazine as one of the top Bitcoin consultants for secure self-custody in 2025, alongside other leading specialist firms.

Client testimonials show 24+ verified reviews averaging 4.8/5 rating, with a separate listing rated 4.9/5 (25 reviews). Their approach emphasizes reducing single points of failure and ensuring heirs can access Bitcoin safely through structured inheritance planning without exposing keys to unnecessary risk.

Bitcoin Keeper is a fully non-custodial, open-source wallet where users maintain complete control of their private keys. The company never has access to user funds and cannot sign or authorize transactions on behalf of users.

The application code is publicly available on GitHub (bithyve/bitcoin-keeper), allowing independent security review by the community. Bitcoin Keeper provides signed checksums and detached GPG signatures for APK verification, enabling users to confirm they are running authentic, unmodified software. WalletScrutiny has included Bitcoin Keeper in their build verification efforts, indicating attention to transparency.

The wallet supports connecting to your own Bitcoin node, eliminating reliance on third-party servers for transaction verification. Multi-key vault configurations distribute signing authority across multiple devices and locations, removing single points of failure. The app is Bitcoin-only, avoiding the complexity and attack surface of multi-asset wallets.