def BT
import lawful-bytes@0.1.1.0/proof_core.bend as ProofCoreimport Base
import lawful-bytes@0.1.1.0/defs.bend as D
import lawful-arrays@0.1.0.0/proof_tree.bend as P
19def BT(+len: U32, +t: P.Tree<U32>) -> D.Bytes:
20 D.Bytes{len, P.fromT(U32, t)}