Cancel
TxTypeCancel cancels the execution of the transaction with the same nonce in the transaction pool. This transaction type is useful when a submitted transaction seems unprocessed for a certain amount of time.
Import extend from web3py_ext to extend web3 to kaia web3
Import necessary utils from eth_account, web3py_ext and cytoolz
Create a Web3 instance with the specified kairos testnet URL
Also, you can change the provider URL from kairos to quicknode
Load an account from private key
Send a value transfer tx. It will be in the tx pool and canceled before execution. The cancel tx will be failed if it is already executed.
Create an empty transaction of type TxType.CANCEL. You can use empty_tx util to get a tx with default fields filled.
Merge the from and nonce fields into the empty tx by using the merge util.
Make the nonce to be same with previously sent value transfer tx. You need to set the same tx nonce you want to cancel
Use fill_transaction to add more params to transaction object like gas limit...
Sign the cancel tx by user's private key
Recover the signer's address from the signature in signed tx
You can decode the RLP-encoded tx by the Account.decode_transaction util and if you want to make the output format pretty, use the to_pretty util
Send the tx to the blockchain. It will return the tx hash, which will be used to wait the receipt
The wait_for_transaction_receipt method returns the tx receipt if it is completed in the blockchain
Finally, get the result.