title_body: What enables the Cardano blockchain to be capable of storing so much information?
upvoted_answer: You don't have to store a lot of information on the blockchain itself to provide certain evidence. (that something existed at a certain time or was signed by someone, or that something was not tampered with).
  Usually, it is enough to store for example a link to something and a hash or a signature. (i.e. onchain should be stored only the data that are absolutely necessary to prove the required evidence)
  Metadata Example: please look into this transaction (on adastat go to metadata tab and look at the data that is actually stored onchain)
  You will find the link to http://api.cardano.scantrust.io/publicdata/71a7f9d0.json (where the actual data is offchain, basically, this could even be stored somewhere where only a limited group has access to it)
  A good onchain/offchain design combined with batch processing, therefore, enables the cost-effective use of blockchain technology and the preservation of privacy. (which is not Cardano specific)
  To get an idea for example with Atala PRISM hundreds of credentials can be signed in only 1 (one) transaction.