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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, Nutstash, cashu-ts, cdk, Minibits, macadamia Nutshell, cdk-mintd, nutmix
08 Overpaid Lightning fees Nutshell, Nutstash, cashu-ts, cdk, Minibits, macadamia Nutshell, cdk-mintd, nutmix
09 Signature restore Nutshell, cdk, Cashu.me, Minibits, macadamia Nutshell, cdk-mintd
10 Spending conditions Nutshell, cdk, cashu-ts, Minibits Nutshell, cdk-mintd, nutmix
11 Pay-To-Pubkey (P2PK) Nutshell, cdk, Cashu.me, Minibits Nutshell, cdk-mintd, nutmix
12 DLEQ proofs Nutshell, cdk, cashu-ts Nutshell, cdk-mintd, nutmix
13 Deterministic secrets Nutshell, cashu-ts, cdk, macadamia, Minibits -
14 Hashed Timelock Contracts (HTLCs) Nutshell, cdk Nutshell, cdk-mintd, nutmix
15 Partial multi-path payments (MPP) Nutshell, cdk Nutshell, cdk-mintd, nutmix
16 Animated QR codes Cashu.me, macadamia, Minibits -
17 WebSocket subscriptions Nutshell, cdk, Cashu.me, Minibits Nutshell, cdk-mintd, nutmix
18 Payment requests Cashu.me, Boardwalk, cdk, Minibits -
19 Cached Responses - Nutshell, cdk-mintd
20 Signature on Mint Quote cdk, Nutshell cdk-mintd, Nutshell
21 Clear authentication Nutshell, cdk Nutshell, cdk-mintd, nutmix
22 Blind authentication Nutshell, cdk Nutshell, cdk-mintd, nutmix
23 Payment Method: BOLT11 Nutshell, cdk Nutshell, cdk-mintd, nutmix
24 HTTP 402 Payment Required - -
25 Payment Method: BOLT12 cdk, cashu-ts cdk-mintd
26 Payment Request Bech32m Encoding cdk -
27 Nostr Mint Backup Cashu.me, cdk -

Wallets:

Mints: