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 Isn’t OP_CAT a necessary capability to enable recursive covenants which would then enable permanent on-chain KYC? 
 Recursive covenants dont automatically enable onchain kyc. 

You can do onchain kyc today with 2/2 multisig. 
 What pieces would be missing to implement on-chain KYC if recursive covenants are enabled? 

Regarding the possibility to do it with multisig, my understanding is that it would be easier for regulators to have it implemented/enforced through recursive covenants. 
 The easiest way to do it is to just use custodial systems, which is the way everyone is going today.