Tag Anatomy

The components of a Signal Tag identifier and linked verification record.

Tag anatomy

A Signal Tag consists of:

1. Carrier: QR, NFC, or barcode.
2. Identifier: st_* value encoded in the carrier.
3. Verify endpoint: URL pattern resolving that identifier.
4. Record: schema-valid JSON payload tied to lifecycle status and events.

Minimal payload fields

| Field | Purpose | | --- | --- | | id | Unique tag identifier | | status | Lifecycle state | | productId | Product reference | | organizationId | Issuer scope | | createdAt | Creation timestamp |

Use metadata extensions for industry-specific fields without breaking base compatibility.