[SOLVED] Homework 6 – csci 181 52 points

Consider the SimpleCoin2 approach discussed in the lecture. Suppose you want to implement the logic
used by entity G to process transactions and produce the ledger.
The entity G receives a PayCoin transaction and needs to check if this transaction is valid before adding
it to the ledger. You will need to write functions for this scenario.
1) (10 points) Create a PayCoin transaction data structure or class with all the fields it requires.
2) (10 points) Create the blockchain (ledger), (assume the data part of each block contains only one
transaction of type PayCoin). You do not need to compute the hashes,
3) (32 points) Write a function that checks whether a given new transaction is valid or not. If valid
then add it to the blockchain. The definition of “valid” transaction is in the lecture notes. Make
sure to add enough comments to explain what you are doing.
Assumptions:
Assume you have access to everyone’s correct public key. Public keys are also included in the recipient
field of the transaction. Also assume there is a function already implemented that verifies signatures
and returns True or False: boolean verifySignature(pubKey, message, signature)