{
  "@context": [
    "https://letterprove.com/ns/attestation/v1",
    "https://schema.org"
  ],
  "id": "att_reachgrid_80e3bbd7",
  "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": "Reachgrid",
    "domain": "reachgrid.com",
    "url": "https://reachgrid.com",
    "category": "Outbound Sales Engagement Platform"
  },
  "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": 227,
    "shownRepresentTopPercent": 10,
    "percentileMetric": "seats",
    "consentRatePercent": 71,
    "disclosure": "The 9 named customers represent the top 10% of Reachgrid's accounts by seats. 71% of all paying customers consented to independent usage attestation."
  },
  "customers": [
    {
      "company": "Cardinal Freight Systems",
      "industry": "Logistics & Supply Chain",
      "plan": "Enterprise",
      "activeSeats": 148,
      "monthsActive": 27,
      "outcome": "-38% cost per meeting",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Beacon Health Informatics",
      "industry": "Healthcare IT",
      "plan": "Enterprise",
      "activeSeats": 96,
      "monthsActive": 22,
      "outcome": "+51% qualified pipeline",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Tidewater Payments",
      "industry": "Fintech",
      "plan": "Growth",
      "activeSeats": 64,
      "monthsActive": 19,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Ridgeline Industrial Software",
      "industry": "Industrial SaaS",
      "plan": "Enterprise",
      "activeSeats": 132,
      "monthsActive": 31,
      "outcome": "3.1x meetings per rep",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Auberon Cloud Security",
      "industry": "Cybersecurity",
      "plan": "Growth",
      "activeSeats": 58,
      "monthsActive": 14,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Stonecrest Data Labs",
      "industry": "Data & Analytics",
      "plan": "Growth",
      "activeSeats": 41,
      "monthsActive": 16,
      "outcome": "+44% reply rate",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Fairwind Commerce Group",
      "industry": "eCommerce Infrastructure",
      "plan": "Enterprise",
      "activeSeats": 110,
      "monthsActive": 24,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Lument HR Cloud",
      "industry": "HR Technology",
      "plan": "Growth",
      "activeSeats": 37,
      "monthsActive": 12,
      "outcome": "+29% connect rate",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Westmark Legal Cloud",
      "industry": "Legal Technology",
      "plan": "Enterprise",
      "activeSeats": 84,
      "monthsActive": 21,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    }
  ],
  "aggregate": [
    {
      "label": "Active seats across attested accounts",
      "value": "9,600+"
    },
    {
      "label": "Median tenure of attested customers",
      "value": "20.8 mo"
    },
    {
      "label": "Net revenue retention (attested cohort)",
      "value": "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": "ygCSnKpb3vB49t8PUd35do_kJcm75yclMH_s8dit4nA",
    "signatureAlgorithm": "Ed25519",
    "publicKeyHex": "e814af319722acde1f401985342e85ab26147291546d0934efe632a3c72ec954",
    "publicKeyMultibase": "z6Mkv5CvaxbaD1RuJoY9nZ2YZDbteEjY7TALHahXuVf6Jibd",
    "signatureValue": "6FOA5haX9LJgTXMcGvSUlTGRJXKMoIcLzzk6XT8ejWEdFL2WJ5lLJmyFNf2T0bdeWnWuaWDwftsd1KT_3c4fCQ"
  }
}