@Test
/**
 * Get 6 headers of blocks 1-6 in the chain
 */
public void testHeaders2() throws Exception {

    BitcoinSerializer bs = new BitcoinSerializer(MainNetParams.get());
    HeadersMessage hm = (HeadersMessage) bs.deserialize(ByteBuffer.wrap(Hex.decode("f9beb4d96865616465" +
            "72730000000000e701000085acd4ea06010000006fe28c0ab6f1b372c1a6a246ae63f74f931e" +
            "8365e15a089c68d6190000000000982051fd1e4ba744bbbe680e1fee14677ba1a3c3540bf7b1c" +
            "db606e857233e0e61bc6649ffff001d01e3629900010000004860eb18bf1b1620e37e9490fc8a" +
            "427514416fd75159ab86688e9a8300000000d5fdcc541e25de1c7a5addedf24858b8bb665c9f36" +
            "ef744ee42c316022c90f9bb0bc6649ffff001d08d2bd610001000000bddd99ccfda39da1b108ce1" +
            "a5d70038d0a967bacb68b6b63065f626a0000000044f672226090d85db9a9f2fbfe5f0f9609b387" +
            "af7be5b7fbb7a1767c831c9e995dbe6649ffff001d05e0ed6d00010000004944469562ae1c2c74" +
            "d9a535e00b6f3e40ffbad4f2fda3895501b582000000007a06ea98cd40ba2e3288262b28638cec" +
            "5337c1456aaf5eedc8e9e5a20f062bdf8cc16649ffff001d2bfee0a9000100000085144a84488e" +
            "a88d221c8bd6c059da090e88f8a2c99690ee55dbba4e00000000e11c48fecdd9e72510ca84f023" +
            "370c9a38bf91ac5cae88019bee94d24528526344c36649ffff001d1d03e4770001000000fc33f5" +
            "96f822a0a1951ffdbf2a897b095636ad871707bf5d3162729b00000000379dfb96a5ea8c81700ea4" +
            "ac6b97ae9a9312b2d4301a29580e924ee6761a2520adc46649ffff001d189c4c9700")));
    int nBlocks = hm.getBlockHeaders().size();
    assertEquals(nBlocks, 6);
    // index 0 block is the number 1 block in the block chain
    // http://blockexplorer.com/b/1
    Block zeroBlock = hm.getBlockHeaders().get(0);
    String zeroBlockHash = zeroBlock.getHashAsString();
    assertEquals("00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048",
            zeroBlockHash);
    assertEquals(zeroBlock.getNonce(), 2573394689L);
    Block thirdBlock = hm.getBlockHeaders().get(3);
    String thirdBlockHash = thirdBlock.getHashAsString();
    // index 3 block is the number 4 block in the block chain
    // http://blockexplorer.com/b/4
    assertEquals("000000004ebadb55ee9096c9a2f8880e09da59c0d68b1c228da88e48844a1485",
            thirdBlockHash);
    assertEquals(thirdBlock.getNonce(), 2850094635L);
}