Basically NIP 78. Apps should use 30078 for key-valye storage in tags.
https://github.com/nostr-protocol/nips/blob/master/78.md
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Here is one such proposal requiring no NIP
GitHub
GitHub - nobu-maeda/n3xb: naive nostr nym exchange for Bitcoin - An open protocol for decentralized Bitcoin exchanging and a global common order book
naive nostr nym exchange for Bitcoin - An open protocol for decentralized Bitcoin exchanging and a global common order book - nobu-maeda/n3xb