ProofRoot
Result of computeProofRoot: the root the supplied base hashes and proofLayers uncle hashes fold up to, plus the subtreeRoot (the root of just the base-hash subtree, i.e. the node the uncle hashes prove).
Result of computeProofRoot: the root the supplied base hashes and proofLayers uncle hashes fold up to, plus the subtreeRoot (the root of just the base-hash subtree, i.e. the node the uncle hashes prove).