These documents each specify parts of the Cashu protocol. Read the specifications for the legacy API here.
Wallets and mints MUST implement all mandatory specs and CAN implement optional specs.
| NUT # | Description |
|---|---|
| 00 | Cryptography and Models |
| 01 | Mint public keys |
| 02 | Keysets and fees |
| 03 | Swapping tokens |
| 04 | Minting tokens |
| 05 | Melting tokens |
| 06 | Mint info |
| # | Description | Wallets | Mints |
|---|---|---|---|
| 07 | Token state check | Nutshell, Moksha, Nutstash, cashu-ts, cdk-cli | Nutshell, Moksha, cdk-mintd, nutmix |
| 08 | Overpaid Lightning fees | Nutshell, Moksha, Nutstash, cashu-ts, cdk-cli | Nutshell, Moksha, cdk-mintd, nutmix |
| 09 | Signature restore | Nutshell, cdk-cli, cashu-ts, gonuts | Nutshell, cdk-mintd, nutmix |
| 10 | Spending conditions | Nutshell, cdk-cli, cashu-ts | Nutshell, cdk-mintd, nutmix |
| 11 | Pay-To-Pubkey (P2PK) | Nutshell, cdk-cli, cashu-ts | Nutshell, cdk-mintd, nutmix |
| 12 | DLEQ proofs | Nutshell, cdk-cli | Nutshell, cdk-mintd, nutmix |
| 13 | Deterministic secrets | Nutshell, Moksha, cashu-ts, cdk-cli, gonuts | - |
| 14 | Hashed Timelock Contracts (HTLCs) | Nutshell, cdk-cli | Nutshell, cdk-mintd, nutmix |
| 15 | Partial multi-path payments (MPP) | Nutshell | Nutshell |
| 16 | Animated QR codes | Cashu.me | - |
| 17 | WebSocket subscriptions | Nutshell | Nutshell |
| 18 | Payment requests | Cashu.me, Boardwalk, cdk-cli | - |