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Existing Metadata Standards

Web3

Type Network Standard / Name Compatibility Storage Format Comments
Metadata Standard for NFT Marketplace Ethereum OpenSea Metadata Standard ERC721 + ERC1155 onchain + off-chain via HTTP(S) or IPFS
Proposal for Metadata Standard Tezos TZIP-16 onchain + off-chain via HTTP(S) or IPFS JSON https://medium.com/@TQTezos/contract-metadata-on-tezos-e4c692e2f6ba
Implementation of the Proposal for Metadata Standard Tezos TZIP-16 implementation (contract metadata standard)

Web2

Standard Timeline Comment
Dublin Core Start in 1995, first standard in 2007 Dublin Core on wikipedia
RDF W3C rec. in 1999, RDF 1.0 in 2004, RDF 1.1 in 2014 RDF on wikipedia
JSON First spec. by Crockford in 2000, ECMA-404 in 2013 JSON on wikipedia
JSON-LD JSON-LD 1 W3C Rec. in 2014 JSON-LD on wikipedia
Schema.org Started in 2011 by Bing, Google and Yahoo! schema.org on wikipedia

Resources About Web2 Metadata