A blockchain is the worst type of database or file storage system in existence. Some people have zero background in information technology and it shows.
A blockchain is intended to be able to verify all the data without trusting anyone. It's not for storing or searching data.
https://youtu.be/SMEOKDVXlUo?si=xfXV5_8UWvz1BX2j&t=483
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I think you're both right. To be able to verify you need to store the transactions.
