{
  "@context": [
    "https://letterprove.com/ns/attestation/v1",
    "https://schema.org"
  ],
  "id": "att_cargoline_9c171aa0",
  "type": "LetterproveAttestation",
  "schemaVersion": "1.1",
  "attestationKind": "customer-usage",
  "environment": "demonstration",
  "issuer": {
    "name": "Letterprove",
    "id": "did:web:letterprove.com",
    "url": "https://letterprove.com",
    "service": "Independent usage-attestation service"
  },
  "subject": {
    "name": "Cargoline",
    "domain": "cargoline.co",
    "url": "https://cargoline.co",
    "category": "Enterprise Freight & Shipment Tracking"
  },
  "relationship": {
    "type": "third-party",
    "keyCustody": "In production: segregated, HSM-backed issuer key held arm's-length from the subject. This demonstration uses a demo key.",
    "disclosure": "Letterprove is the independent attestation service; in production it operates arm's-length from the subject with segregated key custody. Participating customers grant read-only, scoped access; Letterprove reads usage counters (seats, activity, tenure) — never customer content — and signs the result. This is a demonstration: the subject and customer identities are illustrative and the signing key is a demo key."
  },
  "issuedAt": "2026-08-06T17:00:00Z",
  "expiresAt": "2026-11-04T17:00:00Z",
  "status": "active",
  "coverage": {
    "customersShown": 9,
    "totalCustomers": 137,
    "shownRepresentTopPercent": 10,
    "percentileMetric": "seats",
    "consentRatePercent": 84,
    "disclosure": "The 9 named customers represent the top 10% of Cargoline's accounts by seats. 84% of all paying customers consented to independent usage attestation."
  },
  "customers": [
    {
      "company": "Meridian Freightworks",
      "industry": "Industrial manufacturing",
      "plan": "Enterprise",
      "activeSeats": 184,
      "monthsActive": 29,
      "outcome": "-58% MTTD on lane exceptions",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Cascade Consumer Goods",
      "industry": "CPG / retail distribution",
      "plan": "Enterprise",
      "activeSeats": 142,
      "monthsActive": 22,
      "outcome": "+11 pts on-time delivery",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Northbridge Cold Chain",
      "industry": "Temperature-controlled logistics",
      "plan": "Enterprise Plus",
      "activeSeats": 97,
      "monthsActive": 31,
      "outcome": "-34% detention spend",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Atlas Intermodal Partners",
      "industry": "Intermodal / drayage",
      "plan": "Enterprise",
      "activeSeats": 76,
      "monthsActive": 18,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Halcyon Pharma Logistics",
      "industry": "Pharmaceutical distribution",
      "plan": "Enterprise Plus",
      "activeSeats": 63,
      "monthsActive": 26,
      "outcome": "-41% temperature-excursion dwell",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Redwood Retail Group",
      "industry": "Omnichannel retail",
      "plan": "Enterprise",
      "activeSeats": 128,
      "monthsActive": 20,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Keystone Auto Supply",
      "industry": "Automotive parts distribution",
      "plan": "Growth",
      "activeSeats": 54,
      "monthsActive": 14,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Summit Beverage Co.",
      "industry": "Food & beverage",
      "plan": "Enterprise",
      "activeSeats": 88,
      "monthsActive": 24,
      "outcome": "+9 pts fill-rate visibility",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Fairwind Freight Brokerage",
      "industry": "Freight brokerage / 3PL",
      "plan": "Growth",
      "activeSeats": 47,
      "monthsActive": 16,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    }
  ],
  "aggregate": [
    {
      "label": "Paying enterprise customers",
      "value": "137"
    },
    {
      "label": "Shipments tracked in the trailing 90 days",
      "value": "3.9M"
    },
    {
      "label": "Rolling 90-day platform availability",
      "value": "99.94%"
    }
  ],
  "signatureMeaning": "A valid Ed25519 signature proves this record was issued by Letterprove (key at did:web:letterprove.com) and has not been altered. Each named customer consented and was verified via read-only usage attestation.",
  "methodology": {
    "summary": "Each participating customer grants Letterprove a read-only, scoped token. Letterprove reads usage counters (active seats, activity, tenure) and, where the customer opts in, an outcome metric — never customer content. Figures are canonicalized (RFC 8785 JCS), hashed (SHA-256) and signed with a domain-bound Ed25519 key. The coverage block discloses exactly how representative the shown sample is.",
    "principles": [
      "Named customers consented to be attested.",
      "Read-only usage counters — never customer content.",
      "Coverage percentile disclosed — no cherry-picking hidden.",
      "Signed and independently verifiable — verify, don't trust."
    ]
  },
  "verification": {
    "signatureAlgorithm": "Ed25519",
    "proofType": "JcsEd25519Signature2026",
    "canonicalization": "RFC 8785 JCS (sorted keys, UTF-8, no whitespace)",
    "digestAlgorithm": "SHA-256",
    "didDocumentUrl": "https://letterprove.com/.well-known/did.json",
    "jwksUrl": "https://letterprove.com/.well-known/letterprove/jwks.json",
    "verificationMethod": "did:web:letterprove.com#key-1"
  },
  "proof": {
    "type": "JcsEd25519Signature2026",
    "created": "2026-08-06T17:00:00Z",
    "verificationMethod": "did:web:letterprove.com#key-1",
    "canonicalization": "RFC 8785 JCS (sorted keys, UTF-8, no whitespace)",
    "digestAlgorithm": "SHA-256",
    "digestValue": "EJEkbOXOxHVv3Imb2kQs9pdv8wQgZqm7sJMWbXXv_N8",
    "signatureAlgorithm": "Ed25519",
    "publicKeyHex": "e814af319722acde1f401985342e85ab26147291546d0934efe632a3c72ec954",
    "publicKeyMultibase": "z6Mkv5CvaxbaD1RuJoY9nZ2YZDbteEjY7TALHahXuVf6Jibd",
    "signatureValue": "f5i6Rpe2Eq8trHj-EODYIJ2406JCJIDRKf6A7rKVGWqReRykvc1wjdImjSGI9nJeGwkxLAAlc5UOnU8Tcu5zDg"
  }
}