Not legal advice. This tool validates metadata structure only. It does not verify on-chain token state, confirm marketplace compatibility, or constitute financial advice. Consult a qualified smart-contract engineer before deploying.
🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Paste the full JSON metadata object. Required fields: name, description, image. Recommended: external_url, animation_url, attributes. Optional: license.
Validation Summary
Execution Hash (SHA-256)
Ask your agent
Copy this paragraph into Claude, OpenClaw, or any MCP-aware agent to run this exact tool, with this sample, and verify the artifact.
Run the AINumbers MCP tool `validate_nft_metadata_art209`. Task: Validate NFT metadata against ERC-721 and ERC-1155 required fields plus OpenSea metadata schema recommendations.
Call it with arguments: {"policy_parameters":{"metadata":{"name":"Cosmic Horizon #42","description":"A generative artwork.","image":"ipfs://QmTestHash1234/image.png","external_url":"https://cosmichorizon.example.com/token/42","attributes":[{"trait_type":"Background","value":"Deep Space"}],"license":"CC BY 4.0"}}}
Verify before trusting: call `verify_execution_hash` on mcp.ainumbers.co (https://mcp.ainumbers.co/mcp) with the parameter `claimed_hash` set to the returned `execution_hash`, passing the full artifact the run returned (the object containing `policy_parameters` + `output_payload` + `execution_hash`; equivalently `policy_parameters` + `output_payload` with `claimed_hash`), not the bare hash string, or re-run the in-page WebMCP tool `validate_nft_metadata_art209`.
Return the ledger link https://ledger.ainumbers.co/ so a human can re-verify without contacting us.
PII rule: All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Open the tool with the sample prefilled: https://ainumbers.co/chaingraph/art-209-nft-metadata-validator.html#p=v1.H4sIAAAAAAAA_wEMAfP-eyJtZXRhZGF0YSI6eyJuYW1lIjoiQ29zbWljIEhvcml6b24gIzQyIiwiZGVzY3JpcHRpb24iOiJBIGdlbmVyYXRpdmUgYXJ0d29yay4iLCJpbWFnZSI6ImlwZnM6Ly9RbVRlc3RIYXNoMTIzNC9pbWFnZS5wbmciLCJleHRlcm5hbF91cmwiOiJodHRwczovL2Nvc21pY2hvcml6b24uZXhhbXBsZS5jb20vdG9rZW4vNDIiLCJhdHRyaWJ1dGVzIjpbeyJ0cmFpdF90eXBlIjoiQmFja2dyb3VuZCIsInZhbHVlIjoiRGVlcCBTcGFjZSJ9XSwibGljZW5zZSI6IkNDIEJZIDQuMCJ9fTkGkhoMAQAA