Legacy Account Key
AccountKeyLegacy
Import the @kaiachain/web3js-ext packages to add kaia features on web3
Define sender address, sender private key and new private key to be changed
Set up the provider with the specified kairos testnet URL. A provider in web3js is a read-only abstraction to access the blockchain data.
Also, you can change the provider URL from kairos to quicknode
Define a web3 instance using the provider
Create a sender's wallet with the private key and provider
Declare a transaction in the key field with the type AccountKeyType.Legacy
Sign the transaction with sender's wallet
Send the signed tx to the blockchain. It will return the receipt of the transaction