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HALOWERK sicherwerk RFC 3161 Timestamp Request Builder
x402
HALOWERK sicherwerk RFC 3161 Timestamp Request Builder is a paid API for AI agents from sicher.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Builds a ready-to-post RFC 3161 TimeStampReq binary from a SHA-256 digest, including nonce and certificate request flag, using a pinned OpenSSL build.
Price / call$0.001
Success—
StatusUnknown
How this service works
Produces a ready-to-post RFC 3161 TimeStampReq for a SHA-256 digest you already computed. The pinned OpenSSL build encodes the message imprint, adds a fresh nonce so a replayed response can be detected, and sets the flag that asks the timestamp authority to include its signing certificate in the reply. The result is returned as a binary artifact together with the imprint it was built around, so the caller can check that the request really covers the intended digest.
Output
A DER-encoded RFC 3161 TimeStampReq binary artifact ready to POST to a timestamp authority, along with the message imprint it was built around (so the caller can confirm the request covers the intended digest). The request includes a fresh random nonce to detect replayed TSA responses and the certReq flag set to true so the TSA includes its signing certificate in the reply.
Example use cases
Notarize a signed contract hash
“I've got the SHA-256 hash of a signed PDF contract — b7e3a1c2d4f5609812345678abcdef9012345678abcdef9012345678abcdef90 — can you build the RFC 3161 timestamp request binary so I can submit it to our TSA for a legally-recognized timestamp?”
Prove code existed before a filing date
“I need to timestamp proof that my software existed before our patent filing. Here's the SHA-256 of my source archive: 1a2b3c4d5e6f7890abcdef1234567890abcdef1234567890abcdef1234567890. Please build the TimeStampReq with a nonce so I can send it to a timestamp authority.”
Audit trail for compliance logging
“For our compliance records, I need an RFC 3161 timestamp request for the digest e9f8a7b6c5d4e3f2a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4 — make sure it includes the nonce and requests the TSA's certificate so we can verify the response chain later.”
Technical details
Endpoint
POSThttps://sicher.halowerk.com/v1/oss-openssl-rfc3161-request-build?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cryptographically correct, nonce-protected RFC 3161 timestamp request binary built by a deterministic pinned OpenSSL build, rather than constructing the ASN.1 structure yourself. It is ideal when you want the TSA to include its signing certificate in the reply (for chain verification) and when you need the message imprint echoed back for integrity confirmation. Prefer this over generic TSA client libraries when reproducibility and a pinned build are important for audit or compliance purposes.
Side effects
- Invalid or malformed SHA-256 hex string (not exactly 64 hex characters) — returns validation error
- Payment failure or insufficient USDC balance via x402 — request not processed
- Internal OpenSSL encoding error — returns server error
- Missing sha256 field in request body — returns schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| sha256 | string |
Tags
x402
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