Kind 10019: Nutzap Informational

Overview

Nutzap Informational events (Kind 10019) specify the configuration a user requires to receive Nutzaps, which are P2PK Cashu tokens used for Nostr-native payments. This event indicates the mints a user trusts, the relays where they'll read token events from, and the public key that should be used to P2PK-lock receiving Nutzaps.

Specification

Property	Value
Kind Number	10019
Event Range	Replaceable
Defined in	NIP-61

Content Format

The content field is not specified in NIP-61 and is presumably empty or unused for this event kind.

Tags

Tag Name	Description	Format	Required
relay	Relays where the user will read token events from	["relay", "<relay-url>"]	Yes
mint	Mints the user explicitly agrees to use to receive funds	["mint", "<mint-url>", "<optional-base-unit-1>", "<optional-base-unit-2>"]	Yes
pubkey	Public key that MUST be used to P2PK-lock receiving Nutzaps	["pubkey", "<p2pk-pubkey>"]	Yes

Client Behavior

Clients should:

1. Publish this event to allow others to send Nutzaps to the user
2. Ensure the pubkey specified is not the user's main Nostr public key, but corresponds to the privkey field encrypted in a user's NIP-60 wallet event
3. List only mints that support NUT-11 (P2PK) and NUT-12 (DLEQ proofs)
4. Normalize and deduplicate mint URLs as described in NIP-65

Relay Behavior

Relays simply store and serve these events, with no special behavior required.

Use Cases

• Advertising capability and configuration for receiving Nutzaps (P2PK Cashu tokens)
• Specifying trusted mints for ecash transactions
• Establishing a secure payment channel through Nostr

Example

{
  "id": "fa0f1a8d56ee95a3312c8252bb935d4e9822b3fa869d5c944b4bbf234037fbcf",
  "pubkey": "a48380f4cfcc1ad5378294fcac36439770f9c878dd880ffa94bb74ea54a6f243",
  "created_at": 1683121234,
  "kind": 10019,
  "tags": [
    ["relay", "wss://relay1.example.com"],
    ["relay", "wss://relay2.example.com"],
    ["mint", "https://mint1.example.com", "usd", "sat"],
    ["mint", "https://mint2.example.com", "sat"],
    ["pubkey", "02eaee8939e3565e48cc62967e2fde9d8e2a4b3ec0081f29eceff5c64ef10ac1ed"]
  ],
  "content": "",
  "sig": "37c0598e112963610c6621bc557fe76801012c00db3a6b73b7826b9715abf910de336e37c8a078e0d78faf189e0b87454de14b69b46d8e3d7b9d3cfc29c53e70"
}

References

• NIP-61: Nutzaps
• NIP-60: Wallet Event
• NIP-65: Relay List Metadata
• Cashu NUT-11 (P2PK)
• Cashu NUT-12 (DLEQ Proofs)

Related Kinds

• Kind 9321: Nutzap - Event to send a Nutzap
• Kind 7376: Nutzap Redemption - Event to record Nutzap redemption

Notes

• The pubkey specified in this event MUST NOT be the user's main Nostr public key
• Clients should guide users to only use mints that support P2PK (NUT-11) and DLEQ proofs (NUT-12)
• Mint URLs should be normalized and deduplicated according to NIP-65 guidance