@Before
	public void setUp() throws Exception {
			
		Block genesis = new Block(null);
		SignedBlock sb = SignedBlock.Sign(genesis, issuerID);
		
		testChain = new BlockChain(sb);
		testChain.addBlock( new SignedBlock(null, ctrptyID1 ) );
		testChain.addBlock( new SignedBlock(null, ctrptyID2 ) );
		
	}