CRYPTOCURRENCY
Ethereum: Insert data to transaction with OP_RETURN
Ethereum op_retururn
Op_retururn is a special operating code in Ethereum that allows you to store arbitrary data at the end of each transaction. Here is a step by step guide on how to insert an additional chain with OP_Return and recover the transaction of the block chain, decoding accordingly.
Step 1: Prepare your transaction
Before starting, make sure the transaction is valid. Otherwise, modify it or create a new one that includes all the required data.
Passage 2: Coding the chain data
It is necessary to encode the data of the byte chain format using the UTF-8 coding scheme. This will be used as input for op_retururn.
`Python
Matters Json
by Eth Import Ethereum, transaction
Def Coded_string (Data):
Return Byte (json.dumps (data). Cende ('utf-8'))
Use example:
Data = {"key": "value"}
Encoded_data = code_string (data)
PRINT (Coded_data)
Output: B '{"Key": "Value"}'
Step 3: Create an OP_Return transaction
Create a new transaction object using the Ethereum library. You can use it to create an op_return transaction.
Python
by Eth Import Ethereum, transaction
Def Create_op_retururn_transation (data):
op_retururn = {
"Data": code_data,
"Gasprice": Ethereum.gas_price (),
"Gas": 1000000,
"Nance": Ethereum.gaslimit () + 1,
"Value": 0
}
Return Transaction.transation (Op_retururn)
Use example:
Op_retururn_transazion = Create_op_retururn_transation (data)
Print (op_retururn_transotion.to_sting ())
Output: transaction {Data = B '{"key": "value"}', gastprice = 0.00000000000000000000000, gas = 1000001, nance = 9999, value = 0}
Step 4: Sign the Op_retururn transaction
The transaction company with its private Ethereum key to create a valid signed transaction.
Python
by Eth Import Ethereum, Privatekey
Def sign_op_retururn_transation (transaction):
Private_key = Privatekey.from_file ("Route/A/Private/Key")
Return ethhereum.sign_transation (transaction, private_key)
Use example:
Signed
Print (signed_transation.to_sting ())
Output: transaction {Data = B '{"Key": "Value"}', Gastprice = 0.0000000000000000000000,000, Gas = 1000001, Nance = 9999, Value = 0}
passage 5: get the transaction
Get the block chain transaction using the Ethereum library.
Python
by Eth Import Ethereum
Def get_op_retururn_transation () ::
Replace with the URL or the API key of the Ethereum supplier
Provider_url = "
Initialize the Ethereum client
Et_client = Ethereum (provider_url)
Get the latest block number and the hash of the block chain transaction
Last_block_number = 1000000
Last_Block_Hash = Eth_Client.get_latost_block ()
Company your Op_Retrund transaction with the private key of the last block
Signed
Get the transaction object of the last hash block
Ortat_Block = ethhereum.parse_latost_block (Last_block_number, Ortat_Block_Hash)
Op_retururn_transotion = Ortat_block.get_op_return ()
Return op_retururn_transation
Use example:
Op_retururn_transotion = get_op_retururn_transation ()
Print (op_retururn_transotion.to_sting ())
Output: Transaction {Data = B '{"Key": "Value"}', Gasprice = 0.00000000000000000000,000, Gas = 1000001, Nice = 9999, Value = 0}
passage 6: decade op_retururn data
The chain data decodes at the end of each transaction using theJson ‘library.
“ Python
Matters Json
De decode_op_return_data (data):
Return json.loads (Data.Decode (‘Utf-8’))
Use example:
decoded_data = decode_op_return_data (op_retururn_transation.
