public class MerkleTree
Creation and verification of a Merkle tree for a WireTransaction.
See: https://en.wikipedia.org/wiki/Merkle_tree
Transaction is split into following blocks: inputs, attachments' refs, outputs, commands, notary, signers, tx type, time-window. Merkle Tree is kept in a recursive data structure. Building is done bottom up, from all leaves' hashes. If number of leaves is not a power of two, the tree is padded with zero hashes.
@NotNull public SecureHash getHash()