[Task #4] Verification of ownership

[puzzledsean]

• Write a verify function that takes in:
  • Item ID
  • User ID
• Outputs a True/False of whether the owner was the last user ID in a transaction with that Item ID

Can probably make a call to the history function in issue #4 and output True/False based on the output

[KenG98]

For whoever of us takes care of this: there's an "IsBlockValid" function in blockmanager. It takes the new block as well as the last verified block. If you can, please modify that function to take the new block as well as the ENTIRE blockchain (not just last block), and not just return a boolean for whether or not it's valid, but also return a string with an error code (invalid hash, invalid ownership, invalid item ID, etc etc) - this will make for a dope demo.

[KenG98]

This is like... semi done. It doesn't catch nearly half of cases, but it works on certain cases. There's enough to demo.