How to Create and Validate EIP-4844 Blob Transactions With Sidecar

As a mentee on the Web3j Libraries Full Development Lifecycle project under the 2026 LF Decentralized Trust Mentorship Program ,I have been going deep into the blob transaction support inside Web3j. This tutorial shows Java developers how to create an EIP-4844 blob, generate and validate its KZG sidecar, attach it to a Web3j transaction, send it to Sepolia, and verify the result.