* Add a new transaction to the list of pending transactions (to be added * next time the mining process starts). This verifies that the given *

* Takes all the pending transactions, puts them in a Block and starts the * mining process. It also adds a transaction to send the mining reward to

* Returns the balance of a given wallet address. * * @param {string} address * @returns {number} The balance of the wallet

* Returns the SHA256 of this block (by processing all the data stored * inside this block) * * @returns {string}

* Checks if the signature is valid (transaction has not been tampered with). * It uses the fromAddress as the public key. * * @returns {boole

* Loops over all the blocks in the chain and verify if they are properly * linked together and nobody has tampered with the hashes. By checking

* Signs a transaction with the given signingKey (which is an Elliptic keypair * object that contains a private key). The signature is then stored i

* @returns {Block}

* Returns a list of all transactions that happened * to and from the given wallet address. * * @param {string} address * @return {Transac

* Validates all the transactions inside this block (signature + hash) and * returns true if everything checks out. False if the block is invalid.

* Creates a SHA256 hash of the transaction * * @returns {string}

* Starts the mining process on the block. It changes the 'nonce' until the hash * of the block starts with enough zeros (= difficulty) * * @p

* Returns the latest block on our chain. Useful when you want to create a * new Block and you need the hash of the previous Block. * * @retur

* @param {string} fromAddress * @param {string} toAddress * @param {number} amount

* @param {number} timestamp * @param {Transaction[]} transactions * @param {string} previousHash