DeFi with ICP seems temporarily crippled(on purpose? - Yes! For Now.)

Developers Language Support
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Same as here maybe?: Tackling CertifiedData in Motoko - #18 by skilesare

Bucket.doAThing(witnessContainingLeafsWithAllSwarmNodesAndParentAndTimeStamp, certificate, myParams)

Swarm Node:

public func doAThing(witness: Witness, cert : CandidVersionOfCertificate, myParams: MyParams){
   assert(verifySiblingsAndTimeStamp(cert, witness)); //does this need to get the shared BLS key via a system function?
   //trust below code
}