# Securaw TimeChain2 File Timestamp Registration (delivery_proof)

> Securaw TimeChain2 File Timestamp Registration (delivery_proof) is a paid API for AI agents from www.securaw.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-20).

Registers a file's SHA-256 hash with Securaw/TimeChain2 and returns a downloadable ZIP containing an OpenTimestamps proof, metadata, and independent verification instructions.

## Facts

- Endpoint: POST https://www.securaw.com/cryptovar/x402/delivery_proof?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/securaw-timechain2-file-timestamp-registration-delivery-proof-90feaf64
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pVIx7sHA_eqYXeaTkM_Zc

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability securaw-timechain2-file-timestamp-registration-delivery-proof-90feaf64 -d '<json body>'
```

Example prompt: I need to timestamp the file I just hashed — its SHA-256 is 3a7bd3e2360a3d29eea436fcfb7e44c735d117c42d1c1835420b6b9942dd4f1b — please register it with Securaw TimeChain2 and give me the OpenTimestamps proof ZIP.

## When to prefer this

Choose this endpoint when you need a hash-only (no file upload) cryptographic proof of existence for a document or file, specifically an OpenTimestamps-format .ots proof anchored via Securaw's TimeChain2 service. Prefer this over generic blockchain notarization services when you want an open, independently-verifiable OpenTimestamps proof bundled with verification instructions at low per-call cost ($0.05 USDC). Ideal when file privacy is important since only the SHA-256 is transmitted.

## Known failure modes

- Invalid SHA-256 format (not 64 lowercase hex characters) returns a validation error
- Missing Idempotency-Key header causes request rejection
- Duplicate submission with same Idempotency-Key returns cached result rather than error
- Bitcoin anchoring is not immediate — initial proof is pending confirmation
- No guarantee of specific anchoring deadline; status must be checked separately

## How this service works

Register a file SHA-256 with Securaw/TimeChain2 and receive a downloadable OpenTimestamps proof directly binding its original bytes. ZIP includes .ots, metadata and independent-verification instructions. Hash only; no file upload. Initial receipt is NOT Bitcoin confirmed. Check the status link for later anchoring; no guaranteed deadline, authorship or content-truth certification. Idempotency-Key required.

## Output

A downloadable ZIP archive containing: a .ots (OpenTimestamps) proof file binding the submitted SHA-256 to a TimeChain2 event, associated metadata about the registration, independent verification instructions, and a status link to check when the proof is later anchored to the Bitcoin blockchain. The initial receipt is not yet Bitcoin-confirmed; Bitcoin anchoring occurs later with no guaranteed deadline.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "service": {
   "enum": [
    "delivery_proof"
   ],
   "type": "string"
  },
  "parameters": {
   "type": "object",
   "title": "DeliveryInput",
   "required": [
    "sha256"
   ],
   "properties": {
    "sha256": {
     "type": "string",
     "title": "Sha256",
     "pattern": "^[0-9a-f]{64}$",
     "description": "Lowercase SHA-256 of exact original bytes, computed locally. No filename or private content."
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/securaw-timechain2-file-timestamp-registration-delivery-proof-90feaf64/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.securaw.com](https://www.zero.xyz/host/www.securaw.com/llms.txt)