Determine if the following statements are TRUE or FALSE. Explain your answer if FALSE. a. The Public Key Cryptography in Bitcoin is used to produce Bitcoin addresses and to implement digital signing of transactions. (2 points) b. In the Bitcoin ecosystem, the blockchain refers to the ledger of all the valid transactions that have ever taken place with the Bitcoin protocol. (2 points) c. In the Bitcoin network, miners "build" new blocks upon the chain with the most Bitcoins transacted. (2 points) d. "Proof of Work" in the Bitcoin network ensures that only trusted miners participate. (2 points) e. Executing a "51% attack" against the Bitcoin network requires control of 51% or more of the computational power dedicated to mining. (2 points)