pragma solidity 0.4.18; import "./Vehicle.sol"; contract VehicleOwner { address public owner; mapping(bytes32 => address) public vehicles; event NewVehicleAdded(address indexed newVehicle, uint256 timestamp); function VehicleOwner() public { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; } function createNewVehicle(string model, string make, bytes32 vin) public onlyOwner { address newVehicle = new Vehicle(model, make, vin); vehicles[vin] = newVehicle; NewVehicleAdded(newVehicle, now); } } So, let’s go line and by line and understand what is happening here. Code: pragma solidity 0.4.18; An...

Share and get +16 +16 A Beginner’s Guide to Smart Contracts TLDR: A smart contract is a computer protocol intended to digitally facilitate, verify, or enforce the negotiation or performance of a contract. Smart contracts allow the performance of credible transactions without third parties.One of the best things about the blockchain is that, because it is a decentralized system that exists between all permitted parties, there’s no need to pay intermediaries (Middlemen) and it saves you time and conflict. Blockchains have their problems, but they are rated, undeniably, faster, cheaper, and more secure than traditional systems, which is why banks and governments are turning to them. Enjoy a free lesson from the Blockgeeks Library!In 1994, Nick Szabo, a legal scholar, and cryptographer realize...