AOTrust issues PDRs (Provenance Data Records) — 239-byte cryptographic receipts proving a digital artifact existed at a specific time. $0.01 USDC on Base via x402. Anchored daily to NEAR blockchain. No account needed. Supports ordinary (v0x03) and bilateral (v0x04) signatures.
Positioning: an Independent External Provenance Checkpoint. Native attestations (Sigstore, GitHub artifact attestations) verify a build inside the CI system that produced it. AOTrust complements them: it issues a signed certificate outside GitHub/Microsoft infrastructure and anchors it daily to the NEAR blockchain — so provenance survives even if the repository is rewritten, the CI logs disappear, or the attestation store is unavailable. Use both.
Connect your AI coding agent in 60 seconds and make it notarize
plan/patch/release checkpoints — free tier, no account:
agent-checkpoint/ — mcp.json drop-ins for Cursor,
Cline, and any MCP client, plus a copy-paste AGENTS.md block
(Provenance: <Shield ID> in commits).
# 1. Compute SHA-256 hash of your artifact
HASH=$(echo -n "Hello AOTrust" | sha256sum | cut -d' ' -f1)
# 2. Request notarization → get 402 payment details
curl -X POST https://api.aotrust.link/notarize \
-H "Content-Type: application/json" \
-d "{\"work_hash\":\"$HASH\",\"agent_sig\":\"\",\"agent_pubkey\":\"\"}"
# 3. Pay $0.01 USDC on Base (EIP-3009), then POST with x-payment header
# Full example: see SKILL.md → "Step 3: Pay"For full EIP-3009 signing code (Python + ethers.js examples), see SKILL.md.
| Interface | Best for | Auth |
|---|---|---|
| HTTP API | Developers, scripts, CI/CD | x402 payment (no API key needed); free tier 5/day/IP |
| MCP | AI agents (Claude, Cursor, Cline) | None for discovery + free tools (notary_free 5/day/IP) |
Endpoints:
- API:
https://api.aotrust.link/notarize - MCP:
https://api.aotrust.link/mcp - Verify:
https://verify.aotrust.link - Docs:
https://docs.aotrust.link
- pdr-spec.md — PDR v2.3/v2.4 binary format (Internal 193B + External 239B, ordinary + bilateral)
- pdr_parser.py — standalone parser, zero dependencies, offline verification
- aotrust-notarize/SKILL.md — full integration guide for AI agents
| Feature | AOTrust | Chainlink | OpenTimestamps | Notary.fyi |
|---|---|---|---|---|
| Price/PDR | $0.01 | $0.25+ | Free (slow) | $0.50+ |
| Payment rail | x402 USDC | LINK | Bitcoin TX | Stripe |
| PDR format | 239B binary | Oracle data | OTS file | |
| AI agent native | MCP + HTTP | No | No | No |
| Blockchain anchor | NEAR (daily) | Ethereum | Bitcoin | None |
| Offline verify | Yes (pdr_parser.py) | No | Yes | No |
Notarize build artifacts or AI-generated files directly in CI/CD — free, no wallet needed.
- uses: GitSerge-crypto/aotrust-skills@v1.1
with:
files: dist/*Outputs: shield_id, verify_url, pdr_b64. Results appear in $GITHUB_STEP_SUMMARY as a markdown table with verification links.
name: Release
on:
release:
types: [published]
jobs:
notarize:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: GitSerge-crypto/aotrust-skills@v1.1
with:
files: dist/*
- name: Show shield ID
run: echo "Shield ID: ${{ steps.notarize.outputs.shield_id }}"MIT