def test_invalid_input_initialization(user_input, user_pub): from bigchaindb.common.transaction import Input with raises(TypeError): Input(user_input, user_pub) with raises(TypeError): Input(user_input, tx_input='somethingthatiswrong')
def test_input_deserialization_with_invalid_input(user_pub): from bigchaindb.common.transaction import Input ffill = { 'owners_before': [user_pub], 'fulfillment': None, 'fulfills': None, } with raises(TypeError): Input.from_dict(ffill)
def test_input_deserialization_with_invalid_fulfillment_uri(user_pub): from bigchaindb.common.exceptions import InvalidSignature from bigchaindb.common.transaction import Input ffill = { 'owners_before': [user_pub], 'fulfillment': 'an invalid fulfillment', 'fulfills': None, } with raises(InvalidSignature): Input.from_dict(ffill)
def test_input_serialization(ffill_uri, user_pub): from bigchaindb.common.transaction import Input from cryptoconditions import Fulfillment expected = { 'owners_before': [user_pub], 'fulfillment': ffill_uri, 'fulfills': None, } input = Input(Fulfillment.from_uri(ffill_uri), [user_pub]) assert input.to_dict() == expected
def test_input_deserialization_with_unsigned_fulfillment(ffill_uri, user_pub): from bigchaindb.common.transaction import Input from cryptoconditions import Fulfillment expected = Input(Fulfillment.from_uri(ffill_uri), [user_pub]) ffill = { 'owners_before': [user_pub], 'fulfillment': Fulfillment.from_uri(ffill_uri), 'fulfills': None, } input = Input.from_dict(ffill) assert input == expected
def test_multiple_input_validation_of_transfer_tx(user_input, user_output, user_priv, user2_pub, user2_priv, user3_pub, user3_priv, asset_definition): from bigchaindb.common.transaction import (Transaction, TransactionLink, Input, Output) from cryptoconditions import Ed25519Sha256 from .utils import validate_transaction_model tx = Transaction(Transaction.CREATE, asset_definition, [user_input], [user_output, deepcopy(user_output)]) tx.sign([user_priv]) inputs = [ Input(cond.fulfillment, cond.public_keys, TransactionLink(tx.id, index)) for index, cond in enumerate(tx.outputs) ] outputs = [ Output(Ed25519Sha256(public_key=b58decode(user3_pub)), [user3_pub]), Output(Ed25519Sha256(public_key=b58decode(user3_pub)), [user3_pub]) ] transfer_tx = Transaction('TRANSFER', {'id': tx.id}, inputs, outputs) transfer_tx = transfer_tx.sign([user_priv]) assert transfer_tx.inputs_valid(tx.outputs) is True validate_transaction_model(tx)
def transfer_utx(user_output, user2_output, utx): from bigchaindb.common.transaction import (Input, TransactionLink, Transaction) user_output = user_output.to_dict() input = Input(utx.outputs[0].fulfillment, user_output['public_keys'], TransactionLink(utx.id, 0)) return Transaction('TRANSFER', {'id': utx.id}, [input], [user2_output])
def test_create_create_transaction_multiple_io(user_output, user2_output, user_pub, user2_pub, asset_definition): from bigchaindb.common.transaction import Transaction, Input # a fulfillment for a create transaction with multiple `owners_before` # is a fulfillment for an implicit threshold condition with # weight = len(owners_before) input = Input.generate([user_pub, user2_pub]).to_dict() expected = { 'outputs': [user_output.to_dict(), user2_output.to_dict()], 'metadata': { 'message': 'hello' }, 'inputs': [input], 'operation': 'CREATE', 'version': Transaction.VERSION } tx = Transaction.create([user_pub, user2_pub], [([user_pub], 1), ([user2_pub], 1)], metadata={ 'message': 'hello' }).to_dict() tx.pop('id') tx.pop('asset') assert tx == expected
def test_validate_tx_threshold_duplicated_pk(user_pub, user_priv, asset_definition): from cryptoconditions import Ed25519Sha256, ThresholdSha256 from bigchaindb.common.transaction import Input, Output, Transaction threshold = ThresholdSha256(threshold=2) threshold.add_subfulfillment(Ed25519Sha256(public_key=b58decode(user_pub))) threshold.add_subfulfillment(Ed25519Sha256(public_key=b58decode(user_pub))) threshold_input = Input(threshold, [user_pub, user_pub]) threshold_output = Output(threshold, [user_pub, user_pub]) tx = Transaction(Transaction.CREATE, asset_definition, [threshold_input], [threshold_output]) expected = deepcopy(threshold_input) expected.fulfillment.subconditions[0]['body'].sign( str(tx).encode(), b58decode(user_priv)) expected.fulfillment.subconditions[1]['body'].sign( str(tx).encode(), b58decode(user_priv)) tx.sign([user_priv, user_priv]) subconditions = tx.inputs[0].fulfillment.subconditions expected_subconditions = expected.fulfillment.subconditions assert subconditions[0]['body'].to_dict()['signature'] == \ expected_subconditions[0]['body'].to_dict()['signature'] assert subconditions[1]['body'].to_dict()['signature'] == \ expected_subconditions[1]['body'].to_dict()['signature'] assert tx.inputs[0].to_dict()['fulfillment'] == \ expected.fulfillment.serialize_uri() assert tx.inputs_valid() is True
def prepare_transfer(inputs, outputs, metadata=None): """Create an instance of a :class:`~.Output`. Args: inputs (list of (dict): { 'tx': <(bigchaindb.common.transactionTransaction): input transaction, can differ but must have same asset id>, 'output': <(int): output index of tx> } ) outputs (list of (dict): { 'condition': <(cryptoconditions.Condition): output condition>, 'public_keys': <(optional list of base58): for indexing defaults to `None`>, 'amount': <(int): defaults to `1`> } ) metadata (dict) Raises: TypeError: if `public_keys` is not instance of `list`. """ from bigchaindb.common.transaction import (Input, Output, TransactionLink) from bigchaindb.models import Transaction from cryptoconditions import (Fulfillment, Condition) asset = inputs[0]['tx']['asset'] asset = {'id': asset['id'] if 'id' in asset else inputs[0]['tx']['id']} _inputs, _outputs = [], [] for _input in inputs: _output = _input['tx']['outputs'][_input['output']] _inputs.append( Input(fulfillment=Condition.from_uri(_output['condition']['uri']), owners_before=_output['public_keys'], fulfills=TransactionLink(txid=_input['tx']['id'], output=_input['output']))) for output in outputs: _outputs.append( Output(fulfillment=output['condition'], public_keys=output['public_keys'] if "public_keys" in output else [], amount=output['amount'] if "amount" in output else 1)) return Transaction( operation='TRANSFER', asset=asset, inputs=_inputs, outputs=_outputs, metadata=metadata, )
def create(owner_before, outputs, metadata, asset_data): """ Generate a CREATE transaction. The CREATE transaction creates a new asset. """ input_ = Input.generate([owner_before]) outputs = [Output.from_dict(c) for c in listify(outputs)] tx = Transaction(Transaction.CREATE, {'data': asset_data}, [input_], outputs, metadata) tx = Transaction._to_str(tx.to_dict()) click.echo(tx)
def test_non_create_input_not_found(self, b, user_pk): from cryptoconditions import Ed25519Sha256 from bigchaindb.common.exceptions import InputDoesNotExist from bigchaindb.common.transaction import Input, TransactionLink from bigchaindb.models import Transaction # Create an input for a non existing transaction input = Input(Ed25519Sha256(public_key=b58decode(user_pk)), [user_pk], TransactionLink('somethingsomething', 0)) tx = Transaction.transfer([input], [([user_pk], 1)], asset_id='mock_asset_link') with pytest.raises(InputDoesNotExist): tx.validate(b)
def transfer(inputs, outputs, asset, metadata): """ Generate a TRANSFER transaction. The TRANSFER transaction transfers ownership of a given asset. """ inputs = [Input.from_dict(i) for i in listify(inputs)] outputs = [Output.from_dict(i) for i in listify(outputs)] tx = Transaction(Transaction.TRANSFER, asset=asset, inputs=inputs, outputs=outputs, metadata=metadata) click.echo(Transaction._to_str(tx.to_dict()))
def test_validate_tx_threshold_duplicated_pk(user_pub, user_priv, asset_definition): from cryptoconditions import Ed25519Sha256, ThresholdSha256 from bigchaindb.common.transaction import Input, Output, Transaction threshold = ThresholdSha256(threshold=2) threshold.add_subfulfillment(Ed25519Sha256(public_key=b58decode(user_pub))) threshold.add_subfulfillment(Ed25519Sha256(public_key=b58decode(user_pub))) threshold_input = Input(threshold, [user_pub, user_pub]) threshold_output = Output(threshold, [user_pub, user_pub]) tx = Transaction(Transaction.CREATE, asset_definition, [threshold_input], [threshold_output]) tx_dict = tx.to_dict() tx_dict['inputs'][0]['fulfillment'] = None serialized_tx = json.dumps(tx_dict, sort_keys=True, separators=(',', ':'), ensure_ascii=True) message = sha3_256(serialized_tx.encode()).digest() expected = deepcopy(threshold_input) expected.fulfillment.subconditions[0]['body'].sign(message, b58decode(user_priv)) expected.fulfillment.subconditions[1]['body'].sign(message, b58decode(user_priv)) tx.sign([user_priv, user_priv]) subconditions = tx.inputs[0].fulfillment.subconditions expected_subconditions = expected.fulfillment.subconditions assert subconditions[0]['body'].to_dict()['signature'] == \ expected_subconditions[0]['body'].to_dict()['signature'] assert subconditions[1]['body'].to_dict()['signature'] == \ expected_subconditions[1]['body'].to_dict()['signature'] assert tx.inputs[0].to_dict()['fulfillment'] == \ expected.fulfillment.serialize_uri() assert tx.inputs_valid() is True
def main(): """ Main function """ ctx = {} def pretty_json(data): return json.dumps(data, indent=2, sort_keys=True) client = server.create_app().test_client() host = 'example.com:9984' # HTTP Index res = client.get('/', environ_overrides={'HTTP_HOST': host}) res_data = json.loads(res.data.decode()) ctx['index'] = pretty_json(res_data) # API index res = client.get('/api/v1/', environ_overrides={'HTTP_HOST': host}) ctx['api_index'] = pretty_json(json.loads(res.data.decode())) # tx create privkey = 'CfdqtD7sS7FgkMoGPXw55MVGGFwQLAoHYTcBhZDtF99Z' pubkey = '4K9sWUMFwTgaDGPfdynrbxWqWS6sWmKbZoTjxLtVUibD' asset = {'msg': 'Hello BigchainDB!'} tx = Transaction.create([pubkey], [([pubkey], 1)], asset=asset, metadata={'sequence': 0}) tx = tx.sign([privkey]) ctx['tx'] = pretty_json(tx.to_dict()) ctx['public_keys'] = tx.outputs[0].public_keys[0] ctx['txid'] = tx.id # tx transfer privkey_transfer = '3AeWpPdhEZzWLYfkfYHBfMFC2r1f8HEaGS9NtbbKssya' pubkey_transfer = '3yfQPHeWAa1MxTX9Zf9176QqcpcnWcanVZZbaHb8B3h9' cid = 0 input_ = Input(fulfillment=tx.outputs[cid].fulfillment, fulfills=TransactionLink(txid=tx.id, output=cid), owners_before=tx.outputs[cid].public_keys) tx_transfer = Transaction.transfer([input_], [([pubkey_transfer], 1)], asset_id=tx.id, metadata={'sequence': 1}) tx_transfer = tx_transfer.sign([privkey]) ctx['tx_transfer'] = pretty_json(tx_transfer.to_dict()) ctx['public_keys_transfer'] = tx_transfer.outputs[0].public_keys[0] ctx['tx_transfer_id'] = tx_transfer.id # privkey_transfer_last = 'sG3jWDtdTXUidBJK53ucSTrosktG616U3tQHBk81eQe' pubkey_transfer_last = '3Af3fhhjU6d9WecEM9Uw5hfom9kNEwE7YuDWdqAUssqm' cid = 0 input_ = Input(fulfillment=tx_transfer.outputs[cid].fulfillment, fulfills=TransactionLink(txid=tx_transfer.id, output=cid), owners_before=tx_transfer.outputs[cid].public_keys) tx_transfer_last = Transaction.transfer([input_], [([pubkey_transfer_last], 1)], asset_id=tx.id, metadata={'sequence': 2}) tx_transfer_last = tx_transfer_last.sign([privkey_transfer]) ctx['tx_transfer_last'] = pretty_json(tx_transfer_last.to_dict()) ctx['tx_transfer_last_id'] = tx_transfer_last.id ctx['public_keys_transfer_last'] = tx_transfer_last.outputs[0].public_keys[ 0] # block node_private = "5G2kE1zJAgTajkVSbPAQWo4c2izvtwqaNHYsaNpbbvxX" node_public = "DngBurxfeNVKZWCEcDnLj1eMPAS7focUZTE5FndFGuHT" signature = "53wxrEQDYk1dXzmvNSytbCfmNVnPqPkDQaTnAe8Jf43s6ssejPxezkCvUnGTnduNUmaLjhaan1iRLi3peu6s5DzA" app_hash = 'f6e0c49c6d94d6924351f25bb334cf2a99af4206339bf784e741d1a5ab599056' block = lib.Block(height=1, transactions=[tx.to_dict()], app_hash=app_hash) block_dict = block._asdict() block_dict.pop('app_hash') ctx['block'] = pretty_json(block_dict) ctx['blockid'] = block.height # block status block_list = [block.height] ctx['block_list'] = pretty_json(block_list) base_path = os.path.join(os.path.dirname(__file__), 'source/http-samples') if not os.path.exists(base_path): os.makedirs(base_path) for name, tpl in TPLS.items(): path = os.path.join(base_path, name + '.http') code = tpl % ctx with open(path, 'w') as handle: handle.write(code)
def main(): """ Main function """ ctx = {} def pretty_json(data): return json.dumps(data, indent=2, sort_keys=True) client = server.create_app().test_client() host = 'example.com:9984' # HTTP Index res = client.get('/', environ_overrides={'HTTP_HOST': host}) res_data = json.loads(res.data.decode()) res_data['keyring'] = [ "6qHyZew94NMmUTYyHnkZsB8cxJYuRNEiEpXHe1ih9QX3", "AdDuyrTyjrDt935YnFu4VBCVDhHtY2Y6rcy7x2TFeiRi" ] res_data['public_key'] = 'NC8c8rYcAhyKVpx1PCV65CBmyq4YUbLysy3Rqrg8L8mz' ctx['index'] = pretty_json(res_data) # API index res = client.get('/api/v1/', environ_overrides={'HTTP_HOST': host}) ctx['api_index'] = pretty_json(json.loads(res.data.decode())) # tx create privkey = 'CfdqtD7sS7FgkMoGPXw55MVGGFwQLAoHYTcBhZDtF99Z' pubkey = '4K9sWUMFwTgaDGPfdynrbxWqWS6sWmKbZoTjxLtVUibD' asset = {'msg': 'Hello BigchainDB!'} tx = Transaction.create([pubkey], [([pubkey], 1)], asset=asset, metadata={'sequence': 0}) tx = tx.sign([privkey]) ctx['tx'] = pretty_json(tx.to_dict()) ctx['public_keys'] = tx.outputs[0].public_keys[0] ctx['txid'] = tx.id # tx transfer privkey_transfer = '3AeWpPdhEZzWLYfkfYHBfMFC2r1f8HEaGS9NtbbKssya' pubkey_transfer = '3yfQPHeWAa1MxTX9Zf9176QqcpcnWcanVZZbaHb8B3h9' cid = 0 input_ = Input(fulfillment=tx.outputs[cid].fulfillment, fulfills=TransactionLink(txid=tx.id, output=cid), owners_before=tx.outputs[cid].public_keys) tx_transfer = Transaction.transfer([input_], [([pubkey_transfer], 1)], asset_id=tx.id, metadata={'sequence': 1}) tx_transfer = tx_transfer.sign([privkey]) ctx['tx_transfer'] = pretty_json(tx_transfer.to_dict()) ctx['public_keys_transfer'] = tx_transfer.outputs[0].public_keys[0] ctx['tx_transfer_id'] = tx_transfer.id # privkey_transfer_last = 'sG3jWDtdTXUidBJK53ucSTrosktG616U3tQHBk81eQe' pubkey_transfer_last = '3Af3fhhjU6d9WecEM9Uw5hfom9kNEwE7YuDWdqAUssqm' cid = 0 input_ = Input(fulfillment=tx_transfer.outputs[cid].fulfillment, fulfills=TransactionLink(txid=tx_transfer.id, output=cid), owners_before=tx_transfer.outputs[cid].public_keys) tx_transfer_last = Transaction.transfer([input_], [([pubkey_transfer_last], 1)], asset_id=tx.id, metadata={'sequence': 2}) tx_transfer_last = tx_transfer_last.sign([privkey_transfer]) ctx['tx_transfer_last'] = pretty_json(tx_transfer_last.to_dict()) ctx['tx_transfer_last_id'] = tx_transfer_last.id ctx['public_keys_transfer_last'] = tx_transfer_last.outputs[0].public_keys[ 0] # block node_private = "5G2kE1zJAgTajkVSbPAQWo4c2izvtwqaNHYsaNpbbvxX" node_public = "DngBurxfeNVKZWCEcDnLj1eMPAS7focUZTE5FndFGuHT" signature = "53wxrEQDYk1dXzmvNSytbCfmNVnPqPkDQaTnAe8Jf43s6ssejPxezkCvUnGTnduNUmaLjhaan1iRLi3peu6s5DzA" block = Block(transactions=[tx], node_pubkey=node_public, voters=[node_public], signature=signature) ctx['block'] = pretty_json(block.to_dict()) ctx['blockid'] = block.id block_transfer = Block(transactions=[tx_transfer], node_pubkey=node_public, voters=[node_public], signature=signature) ctx['block_transfer'] = pretty_json(block.to_dict()) # vote DUMMY_SHA3 = '0123456789abcdef' * 4 b = Bigchain(public_key=node_public, private_key=node_private) vote = b.vote(block.id, DUMMY_SHA3, True) ctx['vote'] = pretty_json(vote) # block status block_list = [block_transfer.id, block.id] ctx['block_list'] = pretty_json(block_list) base_path = os.path.join(os.path.dirname(__file__), 'source/http-samples') if not os.path.exists(base_path): os.makedirs(base_path) for name, tpl in TPLS.items(): path = os.path.join(base_path, name + '.http') code = tpl % ctx with open(path, 'w') as handle: handle.write(code)
def user_user2_threshold_input(user_user2_threshold, user_pub, user2_pub): from bigchaindb.common.transaction import Input return Input(user_user2_threshold, [user_pub, user2_pub])
def user_input(user_Ed25519, user_pub): from bigchaindb.common.transaction import Input return Input(user_Ed25519, [user_pub])
def prepare_transfer_transaction(*, inputs, recipients, asset, metadata=None): """Prepares a ``"TRANSFER"`` transaction payload, ready to be fulfilled. Args: inputs (:obj:`dict` | :obj:`list` | :obj:`tuple`): One or more inputs holding the condition(s) that this transaction intends to fulfill. Each input is expected to be a :obj:`dict`. recipients (:obj:`str` | :obj:`list` | :obj:`tuple`): One or more public keys representing the new recipients(s) of the asset being transferred. asset (:obj:`dict`): A single-key dictionary holding the ``id`` of the asset being transferred with this transaction. metadata (:obj:`dict`): Metadata associated with the transaction. Defaults to ``None``. Returns: dict: The prepared ``"TRANSFER"`` transaction. .. important:: * ``asset`` MUST be in the form of:: { 'id': '<Asset ID (i.e. TX ID of its CREATE transaction)>' } Example: .. todo:: Replace this section with docs. In case it may not be clear what an input should look like, say Alice (public key: ``'3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf'``) wishes to transfer an asset over to Bob (public key: ``'EcRawy3Y22eAUSS94vLF8BVJi62wbqbD9iSUSUNU9wAA'``). Let the asset creation transaction payload be denoted by ``tx``:: # noqa E501 >>> tx {'asset': {'data': {'msg': 'Hello BigchainDB!'}}, 'id': '9650055df2539223586d33d273cb8fd05bd6d485b1fef1caf7c8901a49464c87', 'inputs': [{'fulfillment': {'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf', 'type': 'ed25519-sha-256'}, 'fulfills': None, 'owners_before': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']}], 'metadata': None, 'operation': 'CREATE', 'outputs': [{'amount': '1', 'condition': {'details': {'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf', 'type': 'ed25519-sha-256'}, 'uri': 'ni:///sha-256;7ApQLsLLQgj5WOUipJg1txojmge68pctwFxvc3iOl54?fpt=ed25519-sha-256&cost=131072'}, 'public_keys': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']}], 'version': '2.0'} Then, the input may be constructed in this way:: output_index output = tx['transaction']['outputs'][output_index] input_ = { 'fulfillment': output['condition']['details'], 'input': { 'output_index': output_index, 'transaction_id': tx['id'], }, 'owners_before': output['owners_after'], } Displaying the input on the prompt would look like:: >>> input_ {'fulfillment': { 'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf', 'type': 'ed25519-sha-256'}, 'input': {'output_index': 0, 'transaction_id': '9650055df2539223586d33d273cb8fd05bd6d485b1fef1caf7c8901a49464c87'}, 'owners_before': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']} To prepare the transfer: >>> prepare_transfer_transaction( ... inputs=input_, ... recipients='EcRawy3Y22eAUSS94vLF8BVJi62wbqbD9iSUSUNU9wAA', ... asset=tx['transaction']['asset'], ... ) """ if not isinstance(inputs, (list, tuple)): inputs = (inputs, ) if not isinstance(recipients, (list, tuple)): recipients = [([recipients], 1)] # NOTE: Needed for the time being. See # https://github.com/bigchaindb/bigchaindb/issues/797 if isinstance(recipients, tuple): recipients = [(list(recipients), 1)] fulfillments = [ Input(_fulfillment_from_details(input_['fulfillment']), input_['owners_before'], fulfills=TransactionLink( txid=input_['fulfills']['transaction_id'], output=input_['fulfills']['output_index'])) for input_ in inputs ] transaction = Transaction.transfer( fulfillments, recipients, asset_id=asset['id'], metadata=metadata, ) return transaction.to_dict()
def prepare_transfer_transaction(*, inputs, recipients, asset, metadata=None): """ Prepares a ``"TRANSFER"`` transaction payload, ready to be fulfilled. Args: inputs (:obj:`dict` | :obj:`list` | :obj:`tuple`): One or more inputs holding the condition(s) that this transaction intends to fulfill. Each input is expected to be a :obj:`dict`. recipients (:obj:`str` | :obj:`list` | :obj:`tuple`): One or more public keys representing the new recipients(s) of the asset being transferred. asset (:obj:`dict`): A single-key dictionary holding the ``id`` of the asset being transferred with this transaction. metadata (:obj:`dict`): Metadata associated with the transaction. Defaults to ``None``. Returns: dict: The prepared ``"TRANSFER"`` transaction. .. important:: * ``asset`` MUST be in the form of:: { 'id': '<Asset ID (i.e. TX ID of its CREATE transaction)>' } Example: .. todo:: Replace this section with docs. In case it may not be clear what an input should look like, say Alice (public key: ``'3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf'``) wishes to transfer an asset over to Bob (public key: ``'EcRawy3Y22eAUSS94vLF8BVJi62wbqbD9iSUSUNU9wAA'``). Let the asset creation transaction payload be denoted by ``tx``:: # noqa E501 >>> tx {'id': '57cff2b9490468bdb6d4767a1b07905fdbe18d638d9c7783f639b4b2bc165c39', 'transaction': {'asset': {'data': {'msg': 'Hello BigchainDB!'}, 'id': '57cff2b9490468bdb6d4767a1b07905fdbe18d638d9c7783f639b4b2bc165c39'}, 'conditions': [{'amount': 1, 'cid': 0, 'condition': {'details': {'bitmask': 32, 'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf', 'signature': None, 'type': 'fulfillment', 'type_id': 4}, 'uri': 'cc:4:20:IMe7QSL5xRAYIlXon76ZonWktR0NI02M8rAG1bN-ugg:96'}, 'owners_after': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']}], 'fulfillments': [{'fid': 0, 'fulfillment': 'cf:4:IMe7QSL5xRAYIlXon76ZonWktR0NI02M8rAG1bN-ughA8-9lUJYc_LGAB_NtyTPCCV58LfMcNZ9-0PUB6m1y_6pgTbCOQFBEeDtm_nC293CbpZjziwq7j3skrzS-OiAI', 'input': None, 'owners_before': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']}], 'metadata': None, 'operation': 'CREATE', 'timestamp': '1479393278'}, 'version': 1} Then, the input may be constructed in this way:: cid = 0 condition = tx['transaction']['conditions'][cid] input_ = { 'fulfillment': condition['condition']['details'], 'input': { 'cid': cid, 'txid': tx['id'], }, 'owners_before': condition['owners_after'], } Displaying the input on the prompt would look like:: >>> input_ {'fulfillment': {'bitmask': 32, 'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf', 'signature': None, 'type': 'fulfillment', 'type_id': 4}, 'input': {'cid': 0, 'txid': '57cff2b9490468bdb6d4767a1b07905fdbe18d638d9c7783f639b4b2bc165c39'}, 'owners_before': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']} To prepare the transfer: >>> prepare_transfer_transaction( ... inputs=input_, ... recipients='EcRawy3Y22eAUSS94vLF8BVJi62wbqbD9iSUSUNU9wAA', ... asset=tx['transaction']['asset'], ... ) """ if not isinstance(inputs, (list, tuple)): inputs = (inputs, ) if not isinstance(recipients, (list, tuple)): recipients = [([recipients], 1)] # NOTE: Needed for the time being. See # https://github.com/bigchaindb/bigchaindb/issues/797 if isinstance(recipients, tuple): recipients = [(list(recipients), 1)] fulfillments = [ Input(Fulfillment.from_dict(input_['fulfillment']), input_['owners_before'], fulfills=TransactionLink(**input_['fulfills'])) for input_ in inputs ] transaction = Transaction.transfer( fulfillments, recipients, asset_id=asset['id'], metadata=metadata, ) return transaction.to_dict()