resdb_driver/transaction.py [798:821]:
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        tx_dict = self.to_dict()
        tx_dict = Transaction._remove_signatures(tx_dict)
        tx_serialized = Transaction._to_str(tx_dict)
        for i, input_ in enumerate(self.inputs):
            self.inputs[i] = self._sign_input(input_, tx_serialized, key_pairs)

        self._hash()

        return self

    @classmethod
    def _sign_input(cls, input_, message, key_pairs):
        """! Signs a single Input.
        Note:
            This method works only for the following Cryptoconditions
            currently:
                - Ed25519Fulfillment
                - ThresholdSha256.

        @param input_ (:class:`~resdb.transaction.Input`) The Input to be signed.
        @param message (str): The message to be signed
        @param key_pairs (dict): The keys to sign the Transaction with.
        """
        if isinstance(input_.fulfillment, Ed25519Sha256):
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service/sdk_validator/resdb_validator/transaction.py [852:878]:
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        tx_dict = self.to_dict()
        tx_dict = Transaction._remove_signatures(tx_dict)
        tx_serialized = Transaction._to_str(tx_dict)
        for i, input_ in enumerate(self.inputs):
            self.inputs[i] = self._sign_input(input_, tx_serialized, key_pairs)

        self._hash()

        return self

    @classmethod
    def _sign_input(cls, input_, message, key_pairs):
        """Signs a single Input.

            Note:
                This method works only for the following Cryptoconditions
                currently:
                    - Ed25519Fulfillment
                    - ThresholdSha256.

            Args:
                input_ (:class:`~resdb_validator.transaction.
                    Input`) The Input to be signed.
                message (str): The message to be signed
                key_pairs (dict): The keys to sign the Transaction with.
        """
        if isinstance(input_.fulfillment, Ed25519Sha256):
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