Trust Lineage Protocol

CALT Watermarking for FCS 4.0

Overview

Content Attribution and Lineage Tracking (CALT) ensures verifiable trust chains from sponsor → agent → user.

Watermark Structure

{
  "calt_version": "1.0",
  "sponsor": {
    "domain": "example.com",
    "verified": true,
    "timestamp": "2026-01-18T12:00:00Z"
  },
  "agent": {
    "platform": "ChatGPT",
    "covenant": "FCS-4.0",
    "response_id": "resp_abc123"
  },
  "verification": {
    "hash": "sha256:abc...def",
    "signature": "RSA:xyz...789",
    "public_key_url": "https://agent-ads.org/keys/2026-01.pem"
  },
  "lineage": {
    "query_hash": "sha256:query_fingerprint",
    "affinity_score": 0.87,
    "selection_method": "resonance_based"
  }
}

Verification

Check watermark authenticity:

POST /beacons/verify
Content-Type: application/json

{
  "watermark": "...",
  "response_text": "..."
}

Response:
{
  "valid": true,
  "sponsor_verified": true,
  "covenant_compliant": true,
  "timestamp": "2026-01-18T12:00:00Z"
}

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