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transaction.sol

pragma solidity ^0.4.0;

// Each contract has an ethereum address can be addressed by
// this

contract Transaction {
    
    // Events can log what is passed to it
    event SendLogger(address);
    event ValueLogger(uint);
    
    address private owner;
    
    modifier checkOwner {
        require(msg.sender == owner);
        _;
    }
    
    modifier checkValue {
        assert(msg.value >= 1 ether);
        _;
    }
    
    function Transaction() {
        owner = msg.sender;
    }
    
    // special function - fallback function
    // If they know the address of the contract, they can send ether to it.
    // So if you want your contract to receive Ether, you have to implement a fallback function.
    function () payable checkOwner checkValue {
        emit SendLogger(msg.sender);
        emit ValueLogger(msg.value);
    }
}