Chitin Cert — Verifiable On-Chain Certificates

Issue verifiable credentials to any agent or wallet on Base L2. Each certificate is minted as a non-transferable NFT, permanently stored on Arweave, and verifiable by anyone.

Skill file: https://certs.chitin.id/skill.md

Why Chitin Cert

Permanent — Arweave storage + Base L2 NFT. Cannot be faked, deleted, or transferred.
Verifiable — Anyone can verify a cert via API or on-chain, no trust required.
7 cert types — Achievements, capabilities, compliance, audits, partnerships, and more.
Batchable — Up to 100 certs in a single transaction.
Soul-linked — Optionally bind a cert to a Chitin SBT for deeper identity anchoring.

Base URL

https://certs.chitin.id/api/v1

🔒 Security: Never send your wallet private key to any domain. API key (ck_...) is for cert issuance only — treat it as sensitive.

Cert Types

| Type | Use For | |------|---------| | achievement | Milestones, wins, accomplishments | | capability | Verified skills and abilities | | compliance | Security audits, regulatory approvals | | infrastructure | Deployment verifications, uptime records | | partnership | Collaborations, endorsements between parties | | audit | Third-party reviews, code audits | | custom | Anything else |

Setup: Become an Issuer

Two steps before you can issue certs. Both require a wallet signature to prove ownership.

Step 1: Register as Issuer

Build a signed message in the format Chitin Certs: Register issuer {address_lowercase} at {timestamp_ms} (timestamp = Date.now() in milliseconds, must be within ±5 minutes).

curl -X POST https://certs.chitin.id/api/v1/issuers \
  -H "Content-Type: application/json" \
  -d '{
    "address": "0xYOUR_WALLET",
    "name": "Your Organization",
    "description": "Optional: what you certify",
    "url": "https://your-site.example.com",
    "signature": "0x...",
    "message": "Chitin Certs: Register issuer 0xyour_wallet at 1740000000000",
    "timestamp": 1740000000000
  }'

Response:

{
  "success": true,
  "data": {
    "id": "iss_1740000000_abc123",
    "address": "0xyour_wallet",
    "name": "Your Organization",
    "trustTier": "unverified",
    "certCount": 0,
    "createdAt": "2026-02-20T00:00:00Z"
  }
}

Save your issuer id — needed for API key generation.

Step 2: Generate API Key

Build a signed message: Chitin Certs: Generate API key for {issuerId} at {timestamp_ms}

curl -X POST https://certs.chitin.id/api/v1/auth \
  -H "Content-Type: application/json" \
  -d '{
    "issuerId": "iss_1740000000_abc123",
    "name": "production-key",
    "signature": "0x...",
    "message": "Chitin Certs: Generate API key for iss_1740000000_abc123 at 1740000000000",
    "timestamp": 1740000000000
  }'

Response:

{
  "success": true,
  "data": {
    "apiKey": "ck_abc123...",
    "name": "production-key",
    "createdAt": "2026-02-20T00:00:00Z"
  }
}

Save your apiKey — returned only once.

Issue a Certificate

curl -X POST https://certs.chitin.id/api/v1/certs \
  -H "Authorization: Bearer ck_abc123..." \
  -H "Content-Type: application/json" \
  -d '{
    "issuerAddress": "0xYOUR_WALLET",
    "recipientAddress": "0xRECIPIENT",
    "certType": "achievement",
    "title": "First Deployment on Base",
    "description": "Successfully deployed and operated a live service on Base L2.",
    "tags": ["base", "deployment", "milestone"],
    "evidence": "https://basescan.org/tx/0x..."
  }'

Response:

{
  "success": true,
  "data": {
    "tokenId": 2,
    "txHash": "0x...",
    "arweaveTxId": "abc123...",
    "certType": "achievement",
    "recipient": "0xrecipient",
    "isTBA": false
  }
}

Field Reference

| Field | Required | Description | |-------|----------|-------------| | issuerAddress | ✅ | Your registered issuer wallet address | | recipientAddress | ✅ | Recipient's wallet address | | certType | ✅ | One of the 7 cert types | | title | ✅ | Cert title (max 200 chars) | | description | Optional | Longer explanation | | tags | Optional | String array for categorization | | evidence | Optional | URL to proof/supporting material | | expiresAt | Optional | ISO 8601 expiry (e.g. "2027-01-01T00:00:00Z") | | passportRegistry | Optional | ERC-8004 registry address for passport-linked certs | | passportTokenId | Optional | Recipient's ERC-8004 token ID | | soulRegistry | Optional | ChitinSoulRegistry address for soul-linked certs | | soulTokenId | Optional | Recipient's Chitin SBT token ID | | extension | Optional | Arbitrary JSON object for custom metadata |

Soul-linked Cert

Link directly to a Chitin soul for the strongest identity binding:

{
  "issuerAddress": "0xYOUR_WALLET",
  "recipientAddress": "0xRECIPIENT",
  "certType": "capability",
  "title": "Verified Autonomous Agent",
  "soulRegistry": "0x4DB94aD31BC202831A49Fd9a2Fa354583002F894",
  "soulTokenId": 42
}

Batch Issue (Up to 100 Certs)

curl -X POST https://certs.chitin.id/api/v1/certs/batch \
  -H "Authorization: Bearer ck_abc123..." \
  -H "Content-Type: application/json" \
  -d '{
    "issuerAddress": "0xYOUR_WALLET",
    "certs": [
      {
        "recipientAddress": "0xADDR_1",
        "certType": "achievement",
        "title": "Hackathon Winner"
      },
      {
        "recipientAddress": "0xADDR_2",
        "certType": "capability",
        "title": "Verified Code Auditor",
        "description": "Passed the Chitin code audit track"
      }
    ]
  }'

Response:

{
  "success": true,
  "data": {
    "tokenIds": [3, 4],
    "txHash": "0x...",
    "count": 2
  }
}

Read & Verify Certs

Get cert details

curl https://certs.chitin.id/api/v1/certs/2

Verify on-chain status

curl https://certs.chitin.id/api/v1/verify/2

Response:

{
  "tokenId": 2,
  "isValid": true,
  "isRevoked": false,
  "issuer": "0x...",
  "recipient": "0x...",
  "certType": "achievement",
  "issuedAt": 1740000000
}

List certs by recipient

curl "https://certs.chitin.id/api/v1/certs?passport=0xRECIPIENT"

List certs by issuer

curl "https://certs.chitin.id/api/v1/certs?issuer=0xYOUR_WALLET"

List by ERC-8004 passport

curl "https://certs.chitin.id/api/v1/certs?passportRegistry=0x8004A169FB4a3325136EB29fA0ceB6D2e539a432&passportTokenId=42"

Webhooks

Get notified when certs are minted under your issuer:

curl -X POST https://certs.chitin.id/api/v1/webhooks \
  -H "Authorization: Bearer ck_abc123..." \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://your-server.example.com/webhook",
    "events": ["cert.minted"]
  }'

Payload:

{
  "event": "cert.minted",
  "tokenId": 2,
  "txHash": "0x...",
  "arweaveTxId": "...",
  "certType": "achievement",
  "issuer": "0x...",
  "recipient": "0x..."
}

MCP Server

For AI assistants that support MCP, use issue_cert and verify_cert tools directly:

npx -y chitin-mcp-server

Endpoints Reference

| Endpoint | Method | Auth | Description | |----------|--------|------|-------------| | /issuers | POST | Wallet sig | Register as issuer | | /issuers?address=0x... | GET | None | Look up issuer | | /auth | POST | Wallet sig | Generate API key | | /certs | POST | API key | Issue a cert | | /certs/batch | POST | API key | Batch issue (max 100) | | /certs/{certId} | GET | None | Get cert details | | /certs?passport=0x... | GET | None | List by recipient | | /certs?issuer=0x... | GET | None | List by issuer | | /verify/{certId} | GET | None | Verify on-chain | | /metadata/{tokenId} | GET | None | ERC-721 metadata | | /metadata/{tokenId}/image.svg | GET | None | Cert SVG image | | /webhooks | POST | API key | Register webhook |

Contracts (Base Mainnet, Chain ID: 8453)

| Contract | Address | |----------|---------| | CertRegistry (Proxy) | 0x9694Fde4dBb44AbCfDA693b645845909c6032D4d | | CertRegistry (Impl V4) | 0xDc487e6ef33220177c3EBAFC71B5aF2FDb2ce0DF | | ChitinSoulRegistry | 0x4DB94aD31BC202831A49Fd9a2Fa354583002F894 |

About Chitin Cert

Chitin Cert is the credential layer of the Chitin Protocol. Your Chitin soul is your identity. Your certs are your verified history.

Certificates: certs.chitin.id
Identity: chitin.id
MCP Server: chitin.id/docs/mcp