# Gavin Andresen
# 2010-11-16 13:13:05
# https://bitcointalk.org/index.php?topic=1780.msg22268#msg22268

ShadowOfHarbringer:  don't be lazy!  If you want to know if the lockins have been changed, it is easy to find out for yourself. @p{par}

The blockchain checkpoints are in file main.cpp, around line 1,519: @p{brk}

Code:
    // Check that the block chain matches the known block chain up to a checkpoint                                                                         @p{brk}
    if (!fTestNet) @p{brk}
        if ((nHeight == 11111 && hash != uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d")) || @p{brk}
            (nHeight == 33333 && hash != uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6")) || @p{brk}
            (nHeight == 68555 && hash != uint256("0x00000000001e1b4903550a0b96e9a9405c8a95f387162e4944e8d9fbe501cd6a")) || @p{brk}
            (nHeight == 70567 && hash != uint256("0x00000000006a49b14bcf27462068f1264c961f11fa2e0eddd2be0791e1d4124a")) || @p{brk}
            (nHeight == 74000 && hash != uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20"))) @p{brk}
            return error("AcceptBlock() : rejected by checkpoint lockin at %d", nHeight); @p{brk}

 @p{brk}
Even if you don't know C++ or don't know how to use subversion, you can check every release here: @s{(link)}