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DIDs have nothing to do with blockchains, it's just that some people are trying to hype DIDs by artificially linking them with blockchains. They use "crypto" but the "old kind", the good one: cryptography.

While DIDs do not have to link to blockchains the standard itself notes:

Many—but not all—DID methods make use of distributed ledger technology (DLT) or some other form of decentralized network.[1]

[1] https://www.w3.org/TR/did-core/

I think it was this comment: https://news.ycombinator.com/item?id=29750165

Two words. Identity theft.

Could you elaborate a bit on that please? How would that pan out?