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Cashu NUTs (Notation, Usage, and Terminology)
These documents each specify parts of the Cashu protocol. Read the specifications for the legacy API here.
Specifications
Wallets and mints MUST implement all mandatory specs and CAN implement optional specs.
Mandatory
| 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 |
Optional
| # | 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 | - |
| 19 | Cached Responses | - | Nutshell, cdk-mintd |
| 20 | Signature on Mint Quote | cdk-cli, Nutshell | cdk-mintd,Nutshell |