OpenChainGraph Suite · ART-209 · IP Licensing & Tokenization

NFT Metadata Validator

Validates NFT metadata against ERC-721 and ERC-1155 required fields plus OpenSea metadata schema recommendations. Checks required fields (name, description, image), recommended fields (external_url, animation_url, attributes), and license declaration. Returns grouped pass/fail results and a compliance status.

ERC-721 ERC-1155 OpenSea Schema Compliance Mandate Not Legal Advice
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)