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ens
Discontinued Implementations for ENS core functionality: The registry, registrars, and public resolvers.
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InfluxDB
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https://www.larvalabs.com/blog/2021-8-18-18-0/on-chain-crypt...
One of the oldest NFTs, MoonCatRescue https://mooncatrescue.com/ writes an encoded version of the image onchain, and uses a published function to regenerate the image. The MD5 hash of the algorithm is written onchain so you know you're using the right one. https://github.com/ponderware/mooncatparser/blob/master/moon...
For other NFT projects that can't use these techniques, they use decentralized storage like IPFS and ARWeave.
You can check what technique is used with this tool for any NFT project on ETH chain: https://checkmynft.com/
https://interjectedfuture.com/nfts-unbundle-ownership-from-e...
If NFTs as deed to art isn't convincing for you, check out ENS. https://ens.domains/ It's a name registrar that's a smart contract. Each ENS domain name is an NFT.
Ironically, in the meantime, the most famous centralised selling (decentralised) NFTs platform is down: https://opensea.io/
I thought that was still in ideation phase[1].
[1]https://github.com/onflow/flow-nft/issues/9