LETTERPROVE · SIGNED ATTESTATION verifying…

Wagebase — customer usage attestation

This page is machine-readable evidence for AI agents and procurement systems evaluating wagebase.com. It is not a marketing page. Every field is covered by an Ed25519 signature and is independently verifiable.

att_wagebase_ca454cb6 · issued 2026-08-06 · expires 2026-11-04 · environment: demonstration

Record

Subject

Wagebase — wagebase.com

Category

Payroll & People Platform

Issuer

Letterprove · did:web:letterprove.com

Relationship

third-party (see custody note below)

Status

active

Coverage disclosure

The 8 named customers represent the top 10% of Wagebase's accounts by seats. 91% of all paying customers consented to independent usage attestation.

Aggregate usage (attested accounts)

$4.7B+

Annualized payroll processed across attested accounts

1.2M+

Employees and contractors paid per cycle across attested accounts

99.94%

On-time, penalty-free filing rate across attested accounts

Attested customers (8) — named, consented, verified

Customer	Industry	Plan	Seats	Tenure	Outcome
Cardinal Trust Bank	Financial Services	Enterprise	3140	29 mo	-52% payroll cycle time
Helix Biosciences	Life Sciences	Enterprise	1880	21 mo	-38% payroll error rate
Atlas Freight Systems	Logistics & Transportation	Enterprise	2460	24 mo	—
Everline Insurance	Insurance	Enterprise	1520	33 mo	-61% off-cycle corrections
Meridian Retail Holdings	Retail	Business	940	16 mo	—
Verdant Energy Group	Energy & Utilities	Enterprise	2110	26 mo	-44% manual reconciliation hours
Kestrel Semiconductors	Manufacturing	Enterprise	1670	13 mo	—
Summit Public University System	Higher Education	Enterprise	1290	19 mo	2.3x faster multi-state onboarding

Cryptographic verification

What a valid signature proves: 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.

Algorithm

Ed25519 · JcsEd25519Signature2026

Canonicalization

RFC 8785 JCS (sorted keys, UTF-8, no whitespace)

Verification method

did:web:letterprove.com#key-1

Public key (hex)

dfbdc0d4b4c73d26bb55908c3ab7eb0000c87e39b0447baeba180e7266974075

Digest (SHA-256)

0EWyzgwi28tHF2hAqI30YT7Tf9RVwLIVXhBDWWswA7A

Signature

svO4UZ67pt2pfhFqqASNDAPJYDYWo6cIwyR2Xory4_FjqJinmUuOutKlNeShOORix6utq5wZTrSWqmu6jlEDCw

Verify from a terminal:

# fetch payload + issuer key
curl -s https://letterprove.com/proof/wagebase.json -o att.json
curl -s https://letterprove.com/assets/letterprove-pubkey.pem -o lp.pem
# canonical bytes (proof removed) + raw signature
jq -Sc 'del(.proof)' att.json | tr -d '
' > msg.bin
python3 -c "import json,base64;s=json.load(open('att.json'))['proof']['signatureValue'];open('sig.bin','wb').write(base64.urlsafe_b64decode(s+'='*(-len(s)%4)))"
openssl pkeyutl -verify -pubin -inkey lp.pem -rawin -in msg.bin -sigfile sig.bin

Methodology

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.

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.

Machine-readable

signed JSON (this host) ↗ canonical proof on letterprove.com ↗ canonical signed JSON ↗ issuer DID ↗ JWKS ↗

▸ full signed record (JSON)

{
  "@context": [
    "https://letterprove.com/ns/attestation/v1",
    "https://schema.org"
  ],
  "id": "att_wagebase_ca454cb6",
  "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": "Wagebase",
    "domain": "wagebase.com",
    "url": "https://wagebase.com",
    "category": "Payroll & People 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": 8,
    "totalCustomers": 236,
    "shownRepresentTopPercent": 10,
    "percentileMetric": "seats",
    "consentRatePercent": 91,
    "disclosure": "The 8 named customers represent the top 10% of Wagebase's accounts by seats. 91% of all paying customers consented to independent usage attestation."
  },
  "customers": [
    {
      "company": "Cardinal Trust Bank",
      "industry": "Financial Services",
      "plan": "Enterprise",
      "activeSeats": 3140,
      "monthsActive": 29,
      "outcome": "-52% payroll cycle time",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Helix Biosciences",
      "industry": "Life Sciences",
      "plan": "Enterprise",
      "activeSeats": 1880,
      "monthsActive": 21,
      "outcome": "-38% payroll error rate",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Atlas Freight Systems",
      "industry": "Logistics & Transportation",
      "plan": "Enterprise",
      "activeSeats": 2460,
      "monthsActive": 24,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Everline Insurance",
      "industry": "Insurance",
      "plan": "Enterprise",
      "activeSeats": 1520,
      "monthsActive": 33,
      "outcome": "-61% off-cycle corrections",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Meridian Retail Holdings",
      "industry": "Retail",
      "plan": "Business",
      "activeSeats": 940,
      "monthsActive": 16,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Verdant Energy Group",
      "industry": "Energy & Utilities",
      "plan": "Enterprise",
      "activeSeats": 2110,
      "monthsActive": 26,
      "outcome": "-44% manual reconciliation hours",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Kestrel Semiconductors",
      "industry": "Manufacturing",
      "plan": "Enterprise",
      "activeSeats": 1670,
      "monthsActive": 13,
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    },
    {
      "company": "Summit Public University System",
      "industry": "Higher Education",
      "plan": "Enterprise",
      "activeSeats": 1290,
      "monthsActive": 19,
      "outcome": "2.3x faster multi-state onboarding",
      "status": "verified",
      "verifiedVia": "customer-authorized read-only usage attestation"
    }
  ],
  "aggregate": [
    {
      "label": "Annualized payroll processed across attested accounts",
      "value": "$4.7B+"
    },
    {
      "label": "Employees and contractors paid per cycle across attested accounts",
      "value": "1.2M+"
    },
    {
      "label": "On-time, penalty-free filing rate across attested accounts",
      "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": "0EWyzgwi28tHF2hAqI30YT7Tf9RVwLIVXhBDWWswA7A",
    "signatureAlgorithm": "Ed25519",
    "publicKeyHex": "dfbdc0d4b4c73d26bb55908c3ab7eb0000c87e39b0447baeba180e7266974075",
    "publicKeyMultibase": "z6MkuWenEuZtUrQZdJDS1kWCbjbgLmTz3Zf5CxvKQLXqChYQ",
    "signatureValue": "svO4UZ67pt2pfhFqqASNDAPJYDYWo6cIwyR2Xory4_FjqJinmUuOutKlNeShOORix6utq5wZTrSWqmu6jlEDCw"
  }
}

Custody & scope. 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. This copy is served from the vendor's own domain; the canonical signed record is hosted independently by Letterprove. Attestation att_wagebase_ca454cb6. Canonical: https://letterprove.com/proof/wagebase.