Exploring an older version of the blockchain? ( like a git repository? )

kevinkevin Member Posts: 5
Context:
- A organisation writes a contract which associates a hash to personal information
- A new user registers on the DApp, the information is associated to his unique hash
- The user updates his information, the DApp updates the blockchain with the new information

Questions:
- How easy can somebody "go back in time" and see what was there previously ?
- Is that a "catch" that should be kept in mind when developing this kind of App?
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