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, Nutstash, cashu-ts, cdk-cli, gonuts	Nutshell, cdk-mintd, nutmix, macadamia, gonuts
08	Overpaid Lightning fees	Nutshell, Nutstash, cashu-ts, cdk-cli, gonuts	Nutshell, cdk-mintd, nutmix, macadamia,
09	Signature restore	Nutshell, cdk-cli, Cashu.me, gonuts, minibits	Nutshell, cdk-mintd, macadamia, gonuts
10	Spending conditions	Nutshell, cdk-cli, cashu-ts, gonuts	Nutshell, cdk-mintd, nutmix, gonuts
11	Pay-To-Pubkey (P2PK)	Nutshell, cdk-cli, Cashu.me, gonuts	Nutshell, cdk-mintd, nutmix, gonuts
12	DLEQ proofs	Nutshell, cdk-cli, cashu-ts, gonuts	Nutshell, cdk-mintd, nutmix, gonuts
13	Deterministic secrets	Nutshell, cashu-ts, cdk-cli, gonuts, macadamia, minibits	-
14	Hashed Timelock Contracts (HTLCs)	Nutshell, cdk-cli, gonuts	Nutshell, cdk-mintd, nutmix, gonuts
15	Partial multi-path payments (MPP)	Nutshell, cdk-cli, gonuts	Nutshell, cdk-mintd, nutmix, gonuts
16	Animated QR codes	Cashu.me, macadamia, minibits	-
17	WebSocket subscriptions	Nutshell, cdk-cli, Cashu.me, gonuts	Nutshell, cdk-mintd, gonuts
18	Payment requests	Cashu.me, Boardwalk, cdk-cli	-
19	Cached Responses	-	Nutshell, cdk-mintd
20	Signature on Mint Quote	cdk-cli, Nutshell, gonuts	cdk-mintd, Nutshell, gonuts
21	Clear authentication	Nutshell	Nutshell
22	Blind authentication	Nutshell	Nutshell

Wallets:

• Nutshell
• CDK-cli
• cashu-ts
• Macadamia
• Minibits
• Nutstash
• Cashu.me
• Gonuts
• Boardwalk

Mints:

• Nutshell
• Gonuts
• cdk-mintd
• Nutmix