#Examples

#Initialization

1from crypto.transactions.builder.transfer import Transfer

The transaction object used for this section:

 1tx = {
 2    'version': int,
 3    'network': int,
 4    'type': int,
 5    'timestamp': int,
 6    'senderPublicKey', str
 7    'fee': int,
 8    'amount': int,
 9    'expiration': int,
10    'recipientId': str,
11    'signature': str,
12    'id': str
13    'serialized': str,
14}

#Transactions

A transaction is an object specifying the transfer of funds from the sender’s wallet to the recipient’s. Each transaction must be signed by the sender’s private key to prove authenticity and origin. After broadcasting through the client SDK , a transaction is permanently incorporated in the blockchain by a Delegate Node.

#Sign

The crypto SDK can sign a transaction using your private key or passphrase (from which the private key is generated). Ensure you are familiar with digital signatures before using the crypto SDKs.

For serializing and deserializing, we must require the Transaction model:

1from crypto.transactions.transaction import Transaction
2 
3# Serializing
4transaction = Transaction(**tx)
5transaction.serialize()
6 
7# Deserializing
8transaction = Transaction()
9transaction.deserialize(**tx['serialized'])

Using the Transaction builder class.

1transaction = Transfer(recipientId=str, amount=int)
2transaction.schnorr_sign('seedPass')

#Serialize (AIP11)

Serialization of a transaction object ensures it is compact and properly formatted to be incorporated in the ARK blockchain. If you are using the crypto SDK in combination with the public API SDK, you should not need to serialize manually.

1from crypto.transactions.serializer import Serializer
2 
3serialized_transaction = Serializer(tx).serialize()
4 
5>>> <class 'str'>

#Deserialize (AIP11)

A serialized transaction may be deserialized for inspection purposes. The public API does not return serialized transactions, so you should only need to deserialize in exceptional circumstances.

1from crypto.transactions.deserializer import Deserializer
2 
3transaction_data = Deserializer(serialized_data).deserialize()
4 
5>>> <class 'crypto.transactions.transaction.Transaction'>

#Message

The crypto SDK not only supports transactions but can also work with other arbitrary data (expressed as strings).

#Sign

Signing a string works much like signing a transaction: in most implementations, the message is hashed, and the resulting hash is signed using the private key or passphrase.

1from crypto.utils.message import Message
2 
3message = Message.sign(string, 'validSeedPass')
4 
5>>> <class 'crypto.utils.message.Message'>

#Verify

A message’s signature can easily be verified by hash, without the private key that signed the message, by using the verify method.

 1from crypto.utils.message import Message
 2 
 3message = Message(
 4    message=str,
 5    signature=str,
 6    public_key=str
 7)
 8 
 9# Can also be used like this
10message = Message(str, 'validSignature', 'validPublicKey')
11 
12message.verify()
13 
14>>> <class 'bool'>

#Identities

The identities class allows for the creation and inspection of keyPairs from passphrases. Here you find vital functions when creating transactions and managing wallets.

#Derive the Address from a Passphrase

1from crypto.identity.address import address_from_passphrase
2 
3address_from_passphrase('validSeedPass')
4 
5>>> <class 'str'>

#Derive the Address from a Public Key

1from crypto.identity.address import address_from_public_key
2 
3address_from_public_key('validPublicKey')
4 
5>>> <class 'str'>

#Derive the Address from a Private Key

1from crypto.identity.address import address_from_private_key
2 
3address_from_private_key('validPrivateKey')
4 
5>>> <class 'str'>

#Validate an Address

1from crypto.identity.address import validate_address
2 
3validate_address('validAddress')
4 
5>>> <class 'bool'>

#Private Key

As the name implies, private keys and passphrases are to remain private. Never store these unencrypted and minimize access to these secrets

#Derive the Private Key from a Passphrase

1from crypto.identity.private_key import PrivateKey
2 
3private_key = PrivateKey.from_passphrase('validSeedPass').to_hex()
4 
5>>> <class 'str'>

#Derive the Private Key Instance Object from a Hexadecimal Encoded String

1from crypto.identity.private_key import PrivateKey
2 
3private_key = PrivateKey.from_hex(str)
4 
5>>> <class 'crypto.identity.private_key.PrivateKey'>

#Derive the Private Key from a WIF

1This function has not been implemented in this client library.

#Public Key

Public Keys may be freely shared, and are included in transaction objects to validate the authenticity.

#Derive the Public Key from a Passphrase

1from crypto.identity.public_key import PublicKey
2 
3public_key = PublicKey.from_passphrase('this is a top secret passphrase')
4 
5>>> <class 'str'>

#Derive the Public Key Instance Object from a Hexadecimal Encoded String

1from crypto.identity.public_key import PublicKey
2 
3public_key = PublicKey.from_hex(str)
4 
5>>> <class 'crypto.identity.public_key.PublicKey'>

#Validate a Public Key

1This function has not been implemented in this client library.

#WIF

The WIF should remain secret, just like your passphrase and private key.

#Derive the WIF from a Passphrase

1from crypto.identity.wif import wif_from_passphrase
2 
3wif = wif_from_passphrase('validSeedPass')
4 
5>>> <class 'str'>