Contract  0xf2640423f68822996d7d9e3134936f5f66969ce7  

pragma solidity ^0.4.15;
// Proof of Existence contract, version 3
contract ProofOfExistence3 {
	mapping (bytes32 => bool) private proofs;
	// store a proof of existence in the contract state
	function storeProof(bytes32 proof) {
		proofs[proof] = true;
	}
	// calculate and store the proof for a document
	function notarize(string document) {
		var proof = proofFor(document);
		storeProof(proof);
	}
	// helper function to get a document's sha256
	function proofFor(string document) constant returns (bytes32) {
		return sha256(document);
	}
	// check if a document has been notarized
	function checkDocument(string document) constant returns (bool) {
		var proof = proofFor(document);
		return hasProof(proof);
	}
	// returns true if proof is stored
	function hasProof(bytes32 proof) constant returns(bool) {
		return proofs[proof];
	}
}

[{"constant":true,"inputs":[{"name":"document","type":"string"}],"name":"checkDocument","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"document","type":"string"}],"name":"notarize","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"proof","type":"bytes32"}],"name":"storeProof","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"proof","type":"bytes32"}],"name":"hasProof","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"document","type":"string"}],"name":"proofFor","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"}]

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bzzr://3babf5d82523542482c3a7f17d79b17d6d8d8a4a802fa746520d3734dfee2da5