Beispiel #1
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 def fromJSON(json: Dict[str, Dict[str, Any]]) -> Any:
     result = Transactions()
     for tx in json:
         if json[tx]["descendant"] == "Claim":
             result.add(Claim.fromJSON(json[tx]))
         elif json[tx]["descendant"] == "Send":
             result.add(Send.fromJSON(json[tx]))
         elif json[tx]["descendant"] == "Data":
             result.add(Data.fromJSON(json[tx]))
         else:
             raise Exception("JSON has an unsupported Transaction type: " +
                             json[tx]["descendant"])
     return result
Beispiel #2
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def DataTest(rpc: RPC) -> None:
    #Create the Spam Filter.
    filter: SpamFilter = SpamFilter(
        bytes.fromhex(
            "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC"
        ))

    #Create the Data.
    data: Data = Data(pubKey.to_bytes().rjust(48, b'\0'),
                      b"Hello There! General Kenobi.")
    data.sign(privKey)
    data.beat(filter)

    #Handshake with the node.
    rpc.meros.connect(254, 254, 0)

    #Send the Data.
    rpc.meros.transaction(data)

    #Verify the Data.
    verifyTransaction(rpc, data)
Beispiel #3
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#Ed25519 keys.
edKeys: List[ed25519.SigningKey] = []
for i in range(6):
    edKeys.append(ed25519.SigningKey(i.to_bytes(1, byteorder="big") * 32))

#Add a single Block to create Merit.
bbFile: IO[Any] = open("python_tests/Vectors/Merit/BlankBlocks.json", "r")
blocks: List[Dict[str, Any]] = json.loads(bbFile.read())
blockchain.add(Block.fromJSON(blocks[0]))
bbFile.close()

#Create a Data per key.
datas: List[Data] = []
for edPrivKey in edKeys:
    datas.append(
        Data(edPrivKey.get_verifying_key().to_bytes().rjust(48, b'\0'),
             bytes()))
    datas[-1].sign(edPrivKey)
    datas[-1].beat(consensus.dataFilter)

#Create 1 Verification per Data.
verifs: List[SignedVerification] = []
for d in range(len(datas)):
    verifs.append(SignedVerification(datas[d].hash))
    verifs[-1].sign(privKey, d)
    if d < 3:
        consensus.add(verifs[-1])

#Create a MeritRemoval off the last one.
sv: SignedVerification = SignedVerification(b'\0' * 48)
sv.sign(privKey, 5)
removal: SignedMeritRemoval = SignedMeritRemoval(
Beispiel #4
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#Ed25519 keys.
edPrivKey: ed25519.SigningKey = ed25519.SigningKey(b'\0' * 32)
edPubKey: ed25519.VerifyingKey = edPrivKey.get_verifying_key()

#BLS keys.
blsPrivKey: blspy.PrivateKey = blspy.PrivateKey.from_seed(b'\0')
blsPubKey: blspy.PublicKey = blsPrivKey.get_public_key()

#Add 13 Blank Blocks.
for i in range(13):
    merit.add(transactions, consensus, Block.fromJSON(blankBlocks[i]))

#Create the Data.
data: Data = Data(
    edPubKey.to_bytes().rjust(48, b'\0'),
    bytes()
)
data.sign(edPrivKey)
data.beat(consensus.dataFilter)
data.verified = True
transactions.add(data)

#Verify it.
verif: SignedVerification = SignedVerification(data.hash)
verif.sign(blsPrivKey, 0)
consensus.add(verif)

#Generate another 6 Blocks.
#Next block should have a record.
block: Block = Block(
    BlockHeader(
Beispiel #5
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def MRPALiveTest(rpc: RPC) -> None:
    file: IO[Any] = open(
        "python_tests/Vectors/Consensus/MeritRemoval/PendingActions.json", "r")
    vectors: Dict[str, Any] = json.loads(file.read())
    #Datas.
    datas: List[Data] = []
    for data in vectors["datas"]:
        datas.append(Data.fromJSON(data))
    #SignedVerifications.
    verifs: List[SignedVerification] = []
    for verif in vectors["verifications"]:
        verifs.append(SignedVerification.fromJSON(verif))
    #Removal.
    removal: SignedMeritRemoval = SignedMeritRemoval.fromJSON(
        vectors["removal"])
    #Consensus.
    consensus: Consensus = Consensus(
        bytes.fromhex(
            "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
        ),
        bytes.fromhex(
            "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC"
        ),
    )
    consensus.add(verifs[0])
    consensus.add(verifs[1])
    consensus.add(verifs[2])
    consensus.add(removal)
    #Blockchain.
    blockchain: Blockchain = Blockchain.fromJSON(
        b"MEROS_DEVELOPER_NETWORK", 60,
        int(
            "FAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
            16), vectors["blockchain"])
    file.close()

    #Handshake with the node.
    rpc.meros.connect(254, 254, len(blockchain.blocks) - 2)

    hash: bytes = bytes()
    msg: bytes = bytes()
    height: int = 0
    while True:
        msg = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.blocks[1].header.hash)
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Send the Datas.
    for data in datas:
        if rpc.meros.transaction(data) != rpc.meros.recv():
            raise TestError("Unexpected message sent.")

    #Send the Verifications.
    for verif in verifs:
        if rpc.meros.signedElement(verif) != rpc.meros.recv():
            raise TestError("Unexpected message sent.")

    #Verify every Data has 100 Merit.
    for data in datas:
        if rpc.call("transactions", "getMerit", [data.hash.hex()]) != {
                "merit": 100
        }:
            raise TestError(
                "Meros didn't verify Transactions with received Verifications."
            )

    #Send and verify the MeritRemoval.
    if rpc.meros.signedElement(removal) != rpc.meros.recv():
        raise TestError("Meros didn't send us the Merit Removal.")
    verifyMeritRemoval(rpc, 1, 100, removal, True)

    #Verify every Data has 100 Merit.
    for data in datas:
        if rpc.call("transactions", "getMerit", [data.hash.hex()]) != {
                "merit": 0
        }:
            raise TestError(
                "Meros didn't revert pending actions of a malicious MeritHolder."
            )

    #Send the next Block.
    rpc.meros.blockHeader(blockchain.blocks[-2].header)
    while True:
        msg = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.last())
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            pass

        elif MessageType(msg[0]) == MessageType.BlockHeader:
            break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Update the MeritRemoval's nonce.
    removal.nonce = 3

    #Verify the Datas have the Merit they should.
    for d in range(len(datas)):
        if rpc.call("transactions", "getMerit", [datas[d].hash.hex()]) != {
                "merit": 100 if d < 3 else 0
        }:
            raise TestError(
                "Meros didn't apply reverted pending actions of a malicious MeritHolder."
            )

    #Verify the MeritRemoval is now accessible with a nonce of 3.
    verifyMeritRemoval(rpc, 4, 200, removal, True)

    #Archive the MeritRemoval.
    rpc.meros.blockHeader(blockchain.blocks[-1].header)
    while True:
        msg = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.last())
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Verify the Blockchain.
    verifyBlockchain(rpc, blockchain)

    #Verify the Consensus.
    verifyConsensus(rpc, consensus)

    #Verify the MeritRemoval again.
    verifyMeritRemoval(rpc, 4, 200, removal, False)
Beispiel #6
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def MRPLiveTest(rpc: RPC) -> None:
    file: IO[Any] = open(
        "python_tests/Vectors/Consensus/MeritRemoval/Partial.json", "r")
    vectors: Dict[str, Any] = json.loads(file.read())
    #Data.
    data: Data = Data.fromJSON(vectors["data"])
    #Consensus.
    consensus: Consensus = Consensus(
        bytes.fromhex(
            "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
        ),
        bytes.fromhex(
            "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC"
        ))
    #MeritRemoval.
    removal: PartiallySignedMeritRemoval = PartiallySignedMeritRemoval.fromJSON(
        vectors["removal"])
    consensus.add(removal.e1)
    consensus.add(removal)
    #Blockchain.
    blockchain: Blockchain = Blockchain.fromJSON(
        b"MEROS_DEVELOPER_NETWORK", 60,
        int(
            "FAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
            16), vectors["blockchain"])
    file.close()

    #Handshake with the node.
    rpc.meros.connect(254, 254, len(blockchain.blocks) - 1)

    sentLast: bool = False
    hash: bytes = bytes()
    msg: bytes = bytes()
    while True:
        msg = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height: int = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.blocks[2].header.hash)
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.ElementRequest:
            if msg[1:49] != removal.holder:
                raise TestError(
                    "Meros asked for an Element from an unknown MeritHolder.")
            if int.from_bytes(msg[49:53], byteorder="big") != 0:
                raise TestError(
                    "Meros asked for an Element not mentioned in a record.")

            rpc.meros.element(removal.e1)

        elif MessageType(msg[0]) == MessageType.TransactionRequest:
            sentLast = True
            if msg[1:49] != data.hash:
                raise TestError("Meros asked for a Transaction not mentioned.")
            rpc.meros.transaction(data)

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            if sentLast == True:
                break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Send and verify the MeritRemoval.
    if rpc.meros.signedElement(removal) != rpc.meros.recv():
        raise TestError("Meros didn't send us the Merit Removal.")
    verifyMeritRemoval(rpc, 2, 200, removal, True)

    #Send the final Block.
    rpc.meros.blockHeader(blockchain.blocks[-1].header)
    while True:
        msg = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.last())
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Verify the Blockchain.
    verifyBlockchain(rpc, blockchain)

    #Verify the MeritRemoval again.
    verifyMeritRemoval(rpc, 2, 200, removal, False)

    #Verify the Consensus.
    verifyConsensus(rpc, consensus)
Beispiel #7
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def MRSNCauseTest(rpc: RPC) -> None:
    file: IO[Any] = open(
        "python_tests/Vectors/Consensus/MeritRemoval/SameNonce.json", "r")
    vectors: Dict[str, Any] = json.loads(file.read())
    #Data.
    data: Data = Data.fromJSON(vectors["data"])
    #MeritRemoval.
    removal: SignedMeritRemoval = SignedMeritRemoval.fromJSON(
        vectors["removal"])
    #Blockchain.
    blockchain: Blockchain = Blockchain.fromJSON(
        b"MEROS_DEVELOPER_NETWORK", 60,
        int(
            "FAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
            16), vectors["blockchain"])
    file.close()

    #Handshake with the node.
    rpc.meros.connect(254, 254, len(blockchain.blocks) - 1)

    hash: bytes = bytes()
    msg: bytes = bytes()
    height: int = 0
    while True:
        msg = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.blocks[1].header.hash)
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Send the Data/SignedVerifications.
    if rpc.meros.transaction(data) != rpc.meros.recv():
        raise TestError("Unexpected message sent.")

    if rpc.meros.signedElement(removal.se1) != rpc.meros.recv():
        raise TestError("Unexpected message sent.")
    rpc.meros.signedElement(removal.se2)

    #Verify the MeritRemoval.
    if rpc.meros.recv() != (MessageType.SignedMeritRemoval.toByte() +
                            removal.signedSerialize()):
        raise TestError("Meros didn't send us the Merit Removal.")
    verifyMeritRemoval(rpc, 1, 100, removal, True)

    #Send the final Block.
    rpc.meros.blockHeader(blockchain.blocks[-1].header)
    while True:
        msg = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.last())
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Verify the Blockchain.
    verifyBlockchain(rpc, blockchain)

    #Verify the MeritRemoval again.
    verifyMeritRemoval(rpc, 1, 100, removal, False)
Beispiel #8
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def VParsable(rpc: RPC) -> None:
    file: IO[Any] = open(
        "python_tests/Vectors/Consensus/Verification/Parsable.json", "r")
    vectors: Dict[str, Any] = json.loads(file.read())
    #Data.
    data: Data = Data.fromJSON(vectors["data"])
    #Consensus.
    consensus: Consensus = Consensus(
        bytes.fromhex(
            "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
        ),
        bytes.fromhex(
            "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC"
        ),
    )
    sv: SignedVerification = SignedVerification.fromJSON(
        vectors["verification"])
    consensus.add(sv)
    #Blockchain.
    blockchain: Blockchain = Blockchain.fromJSON(
        b"MEROS_DEVELOPER_NETWORK", 60,
        int(
            "FAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
            16), vectors["blockchain"])
    file.close()

    #Handshake with the node.
    rpc.meros.connect(254, 254, len(blockchain.blocks))

    sentLast: bool = False
    hash: bytes = bytes()
    while True:
        msg: bytes = rpc.meros.recv()

        if MessageType(msg[0]) == MessageType.Syncing:
            rpc.meros.acknowledgeSyncing()

        elif MessageType(msg[0]) == MessageType.GetBlockHash:
            height: int = int.from_bytes(msg[1:5], byteorder="big")
            if height == 0:
                rpc.meros.blockHash(blockchain.last())
            else:
                if height >= len(blockchain.blocks):
                    raise TestError(
                        "Meros asked for a Block Hash we do not have.")

                rpc.meros.blockHash(blockchain.blocks[height].header.hash)

        elif MessageType(msg[0]) == MessageType.BlockHeaderRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockHeader(block.header)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Header we do not have.")

        elif MessageType(msg[0]) == MessageType.BlockBodyRequest:
            hash = msg[1:49]
            for block in blockchain.blocks:
                if block.header.hash == hash:
                    rpc.meros.blockBody(block.body)
                    break

                if block.header.hash == blockchain.last():
                    raise TestError(
                        "Meros asked for a Block Body we do not have.")

        elif MessageType(msg[0]) == MessageType.ElementRequest:
            rpc.meros.element(sv)

        elif MessageType(msg[0]) == MessageType.TransactionRequest:
            sentLast = True
            rpc.meros.transaction(data)

        elif MessageType(msg[0]) == MessageType.SyncingOver:
            if sentLast:
                break

        else:
            raise TestError("Unexpected message sent: " + msg.hex().upper())

    #Verify the Blockchain.
    verifyBlockchain(rpc, blockchain)

    #Verify the Consensus.
    verifyConsensus(rpc, consensus)

    #Playback their messages.
    rpc.meros.playback()