AIR for Ticketing & Events

{
  "title": "Event Attendance",
  "description": "Verifiable proof of physical attendance at a live event",
  "properties": {
    "eventId": {
      "type": "string",
      "description": "Unique event identifier"
    },
    "eventName": {
      "type": "string",
      "description": "Display name — e.g. 'Coachella 2025 Day 1'"
    },
    "venue": {
      "type": "string",
      "description": "Venue name and city"
    },
    "attendedAt": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp of check-in scan"
    },
    "ticketTier": {
      "type": "string",
      "enum": ["General", "VIP", "Backstage", "Artist"],
      "description": "Ticket category"
    },
    "organizerId": {
      "type": "string",
      "description": "Issuing organizer / promoter identifier"
    }
  },
  "required": ["eventId", "eventName", "attendedAt", "organizerId"]
}

// venue-checkin.js
const { getPartnerJwt } = require('./lib/jwt');
// issuer-controlled helpers backed by your signing keys
const { buildVc, signVc, encryptToHolder } = require('./lib/credential');

const BASE_URL = 'https://api.sandbox.mocachain.org/v1';

async function issueAttendanceCredential({ fanEmail, eventDetails }) {
  const token = await getPartnerJwt();

  // Resolve the fan's AIR Account
  const init = await fetch(`${BASE_URL}/auth/initialize-user`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', 'x-partner-auth': token },
    body: JSON.stringify({ email: fanEmail }),
  }).then((r) => r.json());

  // Build, sign (BJJ_SIG_2021), and encrypt the credential to the holder
  const schemaId = process.env.ATTENDANCE_CREDENTIAL_ID;
  const vc = buildVc({
    holderDid: init.did,
    schemaId,
    credentialSubject: {
      eventId: eventDetails.id,
      eventName: eventDetails.name,
      venue: eventDetails.venue,
      attendedAt: new Date().toISOString(),
      ticketTier: eventDetails.ticketTier,   // "General" | "VIP" | "Backstage"
      organizerId: process.env.ORGANIZER_ID,
    },
  });
  const encrypted = encryptToHolder(signVc(vc), init.publicKey);

  // Store the encrypted envelope in DStorage
  const res = await fetch(`${BASE_URL}/dstorage/vcs`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', 'x-partner-auth': token },
    body: JSON.stringify({
      holderDid: init.did,
      schemaId,
      expiresAt: vc.expirationDate,
      data: encrypted.encryptedData,
      iv: encrypted.iv,
      authTag: encrypted.authTag,
      encryptedKey: encrypted.dataEncPublicKey,
      externalId: vc.id,
    }),
  });
  if (!res.ok) throw new Error(`Attendance issuance failed: ${res.status}`);
  const { storagePath } = await res.json();
  return storagePath;
}

// Called by your ticketing system on each valid scan
app.post('/api/checkin', async (req, res) => {
  const { fanEmail, eventId } = req.body;
  const event = await getEventDetails(eventId);
  const storagePath = await issueAttendanceCredential({ fanEmail, eventDetails: event });
  res.json({ success: true, storagePath });
});

// presale-gate.js  (frontend)
import { AirService } from '@mocanetwork/airkit';

import { AirService, BUILD_ENV } from "@mocanetwork/airkit";

const airService = new AirService({ partnerId: process.env.PARTNER_ID });
await airService.init({ buildEnv: BUILD_ENV.SANDBOX });

async function canAccessPresale() {
  const result = await airService.verifyCredential({
    programId: process.env.PRESALE_VERIFY_PROGRAM_ID,
    // Verifier program rule: organizerId === process.env.ORGANIZER_ID
    // (attended at least 1 prior event by this organizer)
  });
  return result.status === 'COMPLIANT';
}

const isVerifiedFan = await canAccessPresale();
if (isVerifiedFan) {
  showPresaleRegistration();
} else {
  showMessage('Presale access requires verified attendance at a prior event.');
}

// loyalty-tier-check.js — called after each attendance credential issuance
async function checkAndIssueLoyaltyTier(fanEmail) {
  const attendedCount = await getAttendanceCount(fanEmail); // your DB

  if (attendedCount === 5)  await issueLoyaltyTier({ fanEmail, tier: 'Loyal Fan' });
  if (attendedCount === 20) await issueLoyaltyTier({ fanEmail, tier: 'Super Fan' });
}

// issueLoyaltyTier uses the same Direct Issuance pattern — see AIR for Loyalty guide