Built a proof of concept of Bitcoin vaults to showcase CTV & CSFS on Mutinynet signet.
Basic vault: Funds locked to a P2TR output with a single leaf CTV script committing to a trigger tx template. Trigger moves to a conditional P2TR: IF branch requires CSV delay + hot key sig; ELSE is CTV to cold address (immediate, no sig). NUMS internal key forces script spends.
Hybrid vault extends to two leaves: One for CTV path (same as basic). Second for CSFS: Verifies a Schnorr sig over a delegation message (e.g., "EMERGENCY_DELEGATION:AMOUNT=...:RECIPIENT=...:EXPIRY=...:VAULT=...") from treasurer key, allowing direct spend to recipient (escape hatch).
Demo flow 1: Cold clawback via CTV. Fund vault P2TR. Broadcast trigger (satisfies CTV from vault). Then broadcast cold tx from trigger (ELSE branch, satisfies CTV to cold). No delay. Works as emergency response if trigger detected (e.g., hot key compromise).
Demo flow 2: Delegation via CSFS. Treasurer signs message authorizing ops team to spend X sats to Y by Z block (though the amount and other dynamic transaction params are not enforced in the demo, would require OP_AMOUNT, might be possible forcing the spender to provide the transaction data in the witness, check the signature of the tx data with CSFS, and then introspect the transaction elements we want like the amount, but not sure the parsing / splitting of the transaction elements would be practical). Spend vault directly via CSFS leaf: Witness includes sig, message hash, treasurer pubkey, script, control. Bypasses CTV/timelock for authorized emergencies.
GitHub
GitHub - AbdelStark/doko: Bitcoin Vault proof of concept using CTV + CSFS
Bitcoin Vault proof of concept using CTV + CSFS. Contribute to AbdelStark/doko development by creating an account on GitHub.
