CertVera Verify Hash

Verified: delivered 2 times

How we rate this

Delivery health: healthy. Paid successes: 2. Paid failures: 0. Last successful delivery: 2026-10-16. Schema confidence: high.

Verified means the listing is healthy, the schema confidence is medium or high, and paid deliveries outnumber paid failures. Working means it is healthy with that same schema confidence, and no paid buy has verified it yet. Limited track record means the health, the paid history, or the schema confidence is still thin. Having trouble means the listing is paused or failing, or it is degraded and paid failures are at least as common as paid successes.

17 sats · ≈$0.014

Verify a SHA-256 document hash on the Bitcoin blockchain. Returns OP_RETURN proof with block height, tx ID, and merkle path.

More

POST {action: l402_timestamp_verify, hash: <sha256hex>} to certvera.com/api/l402. Free, rate-limited to 10 req/min. No account needed.

Example

What agents use this for. Verify a SHA-256 document hash on the Bitcoin blockchain. Category: identity.

Request

POST https://certvera.com/api/l402?action=l402_timestamp_verify

curl

curl -sS -X POST \
  'https://certvera.com/api/l402?action=l402_timestamp_verify' \
  -H 'Content-Type: application/json' \
  -d '{"hash":"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824"}' \
  # Example only. No L402 token. Sends no sats.

MCP buy

buy({
  "sku": "85f46d48-3b07-4fd2-ae5d-82d847d00ffc",
  "params": {
    "hash": "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824"
  },
  "total_cost": "17 sats",
  "max_total_sats": 17
})

Example response

Stored from a successful paid delivery.

{"success":true,"service":"certvera","timestamp":"2026-10-16T09:45:22-07:00","verified":false,"found":false}

Paul