Now I understand, is it possible to connect to two blockchains at the same time. Thinking of it , it might be a waste of resources but it might still have its benefits, access to multiple userbase and all.
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Yeah, you definitely could do that; would be more resource consuming for sure, but it's absolutely feasible, and makes sense if the benefit outweighs the cost. Apps are generally a mix of non-blockchain and blockchain code, with the actions a user can take, such as uploading a video/making a post/uploading test results usually often being stored in a local database, AS WELL as the blockchain, with the blockchain usually acting as the permanent, reliable record, but the local DB being utilized for speed and efficiency.
I see, I always presumed the blockchain could only store text because of the blocksize and Dapps linked the blockchain to external storages
You can see examples of the type of stuff the steem blockchain holds here:
https://steemblockexplorer.com/block/26378428
and you can see raw transaction data related to transactions verified in a given block by choosing the link to the transaction id for any of the multiple transactions occurring on that page! :)
You could store bytecode, for example, on the steem blockchain if you wanted to, and that bytecode could be representative of video data, etc.; now, it is at a DApps discretion what they try to upload/what they do upload and how they divide resources, but the possibilities of what you store on the blockchain are limitless (with an associated cost, of course).