Let's write the smart contracts for digitalizing fiat currency and storing cell phone numbers linked to bank accounts. Here is the smart contract for digitalizing fiat currency:
pragma solidity ^0.4.18;contract USD { address centralBank; mapping (address => uint256) balances; uint256 totalDestroyed; uint256 totalIssued; event usdIssued(uint256 amount, address to); event usdDestroyed(uint256 amount, address from); event usdTransferred(uint256 amount, address from, address to, string description); function USD() { centralBank = msg.sender; } function issueUSD(uint256 amount, address to) { if(msg.sender == centralBank) { balances[to] += amount; totalIssued += amount; usdIssued(amount, to); } } function destroyUSD(uint256 ...
