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> Happy to answer more questions...

Does these kind of solutions work for every cryptocurrencies? For example does is support Bitcoin? Or is this something that needs some kind of smart contract like those provided by Ethereum?

And another question: what about optionally fully anonymous transaction as in ZCash, does the scheme work to sign tx done using ZK proofs too? Or fully anonymous ones, like David Chaum's upcoming "xx coin"?

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So there are lots of papers and work that has been done for MPC over ECDSA, EdDSA and Schnorr (that covers the majority of the crypto-currencies). MPC unfortunately sounds unfair to me at the moment because it's not widely available for retail in a production-grade state afaik.

The only blockchain-native mechanism that's getting more popular but unfortunately not supported everywhere yet is multi-sig. I consider multi-sig equivalent in term of security to MPC in practice. Bitcoin and many blockchains supports multi-sig addresses (ethereum does this through smart contracts but is still very much a native feature).

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