Custody Safe

Secure, Fee‑Free Bitcoin Self‑Custody

Move your Bitcoin from SmashFi to your own wallet — securely and fee-free.

1. What Is Custody Safe?

Custody Safe is SmashFi’s non‑custodial Bitcoin wallet powered by Multi-Party Computation (MPC) technology. It allows you to hold full control of your Bitcoin without seed phrases, and enables fee-free transfers from your SmashFi account under certain conditions.

2. Why Choose Custody Safe?

• Own Your Bitcoin You retain your private keys – SmashFi does not custody your BTC, removing counterparty risk.

• No Seed Phrases Access your wallet via a passphrase and a backup key; no mnemonic needed.

• Zero-Fee Transfers Enjoy fee-free Bitcoin withdrawals when you move BTC purchased via Auto-Buy, Boost, or Swap. SmashFi covers these fees—and limits apply based on time period. Transfers from external wallets may still incur standard network fees.

• Easy Recovery & Backup If you lose your device, use your Backup Key to restore access—without compromising your security. SmashFi or Fireblocks cannot access your BTC.

• Share Access with Trusted People Add multiple devices (phone, tablet, PC), or invite trusted family/friends to share wallet access (each has their own key share). Even in emergencies, your BTC stays recoverable.

3. How Custody Safe Works

• Built with 2-of-2 MPC technology: One key share on your device + one encrypted share on Fireblocks server → both required to sign transactions → There is no single point of failure or custodial risk.

• Off-chain signature scheme ensures no public exposure like multi-signature wallets.

• Transactions require both device and server signature → SmashFi/Fireblocks cannot move your BTC without your participation.