Returns a generator (1-time iterator) of proofs in insertion order.

        :param tx_id: blockchain transaction id
        :return:

def get_proof_generator(self, tx_id, chain=Chain.bitcoin_mainnet):
        """
        Returns a generator (1-time iterator) of proofs in insertion order.

        :param tx_id: blockchain transaction id
        :return:
        """
        root = ensure_string(self.tree.get_merkle_root())
        node_count = len(self.tree.leaves)
        for index in range(0, node_count):
            proof = self.tree.get_proof(index)
            proof2 = []

            for p in proof:
                dict2 = dict()
                for key, value in p.items():
                    dict2[key] = ensure_string(value)
                proof2.append(dict2)
            target_hash = ensure_string(self.tree.get_leaf(index))
            merkle_proof = {
                "type": ['MerkleProof2017', 'Extension'],
                "merkleRoot": root,
                "targetHash": target_hash,
                "proof": proof2,
                "anchors": [{
                    "sourceId": to_source_id(tx_id, chain),
                    "type": chain.blockchain_type.external_display_value,
                    "chain": chain.external_display_value
                }]}
            yield merkle_proof