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BLOCKCHAIN (For Whom? (Validators Of Those Rules (Public Blockchain,…

- - - - What are Hash Function
      - Why are they used in Blockchain?
      - Properties of Hash Function
  - - - Miners
      - Distributed Ledger
    - - Private and Public Key
        
        Works in Pair
        
        Public Key is derived from Private Key and NOT the other way round?
        
        Message + A's Private Key = Encrypted Message
        Encrypted Message + A's Public Key = Decrypted Message
        This ensures that message has been sent by A
        Everyone has A's Public Key so the intention is not to secure the message BUT to ensure that A has sent the message
        
        Message + B's Public Key = Encrypted Message
        Message + B's Private Key = Decrypted Message
        This ensures message reaches ONLY B but there is no way of knowing that it has been sent by A
      - Two Rules before for Transaction Verification
        
        Person who is spending owns the asset OR not?
        
        Person who owns the asset has not double spent it?
      - Digital Signature
        
        Message
        Hash Of Message -> Private Key -> Encrypted Hash
        Encrypted Hash + Public Key -> Decrypted Hash
        Message -> Hash -> Comparison with Decrypted Hash
        This makes sure that:
        Message has been sent by You (you own the assets)
        Message has not be tampered
        You don't have to sign the whole GB of data but only few MBs of Data