I'm a total newbie to blockchain and just started with it a week ago. I have already deployed a private Ethereum blockchain and want to use it to ensure document integrity which means that I'll be storing MD5 checksums on the blockchain to check at a later point in time.
Now I understand that a blockchain is not for storing data and one should use OP_RETURN to store such information if desired. This brings me to my question i.e. How do I create such a transaction and add the document's hash to it in OP_RETURN using:
- A web3.eth object
Any and all help will be appreciated.