IIRC, you can use OP_RETURN to store data in the blockchain.
Here are a few articles about it:
https://www.wlangiewicz.com/2014/10/24/how-to-put-custom-messages-into-bitcoin-blockchain-op_return/
https://medium.com/@inthebitcoin/how-to-store-a-message-in-the-bitcoin-blockchain-8d5ac0a8ea88
Topic: Can you attach messages into bitcoin transactions? (Read 139 times)
As far as I know, no. You can't attach a message into your bitcoin transaction i.e. in blockchain. There are hot wallets or any other wallets out there which you need to fill out what this transaction for. Though you can sign a message using your bitcoin address for that transaction.
hey im wondering if you can attach a message to a bitcoin transaction?
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