Discovery

Signed by the merchant, published to relays. It is the only thing that lets somebody else's till find this Coupon Manager Service (CMS).

{
  "kind": 30078,
  "pubkey": "<merchant hex>",
  "tags": [
    ["d", "lacrypta.merchant/coupons"],
    ["p", "<CMS hex>"],
    ["client", "merchant-manager"]
  ],
  "content": "{\"v\":2,\"mintUrl\":\"https://merchant.lacrypta.ar/api/coupons/mint\",\"claimUrl\":\"https://merchant.lacrypta.ar/api/coupons/claim\"}"
}

Wire split

CMS key is a tag, not content — relays index tags. Filter {"kinds":[30078],"#d":["lacrypta.merchant/coupons"],"#p":["<CMS>"]} instead of downloading every announcement.

Read it correctly

1. Fetch the newest event by author + d
2. Then read the p tag

Never subscribe filtering by #p alone. Addressable events can hand back an older version that still names you while the current one names someone else.

Rules

• Content is plaintext (this is an announcement, not credentials)
• URLs must be https (localhost allowed for npm run dev)
• v1 announcements (CMS inside content, no p) are dead — merchants must re-sign
• Kind 30078 is addressable: moving hosts is editing one event

Get the CMS pubkey from GET /api/coupons/manager, then sign and PUT /api/coupons/discovery.