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That you _can_ solve it with a blockchain doesn't mean that you can _only_ solve it with a blockchain.

M valid signatures of N authorities is a consensus mechanism that just needs public keys. You don't need a blockchain if you're prepared to trust a set of authorities like stripe and their trusted partners.



It's just a very unreliable consensus mechanism. Why is this being held up as a benefit?


It's not a consensus mechanism in the rigorous sense, it's more similar to a reliable broadcast protocol (less powerful)




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