oraclesMultisig.scala

{-# STDLIB_VERSION 3 #-}
{-# CONTENT_TYPE EXPRESSION #-}
{-# SCRIPT_TYPE ACCOUNT #-}

# array of 5 public keys
let pks = [base58'', base58'', base58'', base58'', base58'']

# inner fold step for each signature
func signedBy(pk:ByteVector) = {
   # is signed by the public key or not
   func f(acc: Boolean, sig: ByteVector)
      = acc || sigVerify(tx.bodyBytes, sig, pk)
   FOLD<8>(tx.proofs, false, f)
}

# outer fold step for each public key
func signedFoldStep(acc:Int, pk:ByteVector)
   = acc + (if(signedBy(pk)) then 1 else 0)

# comparing total number of correct signatures
# to required number of correct signatures
FOLD<5>(pks, 0, signedFoldStep) >= 3