If PEOPLE use Bitcoin Core 0.10.2 or 0.11.0 RC3, they don't have problem.On bottom, the
complet LOG of the blockversion error (v2) ... and the correction of the network (bitcoin !) after this (v3) with 12 blocks in row to invalidate the v2 ORPHAN blocks.
No problem here, the blockchain is true ... and Bitcoin Core do the job.
2015-07-04 01:56:19 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 01:56:19 ERROR: invalid header received
2015-07-04 01:56:19 ProcessMessages(headers, 82 bytes) FAILED peer=191
2015-07-04 01:56:20 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 01:56:20 ERROR: ProcessNewBlock: AcceptBlock FAILED
2015-07-04 01:59:50 UpdateTip: new best=000000000000000002279afdc82b23535938b34a0cb4aaa04dcb85dc1768608e height=363726 log2_work=83.025486 tx=74420964 date=2015-07-04 01:59:05 progress=0.999999 cache=266.4MiB(114099tx)
2015-07-04 02:03:30 UpdateTip: new best=000000000000000014295aaf3ac51264b1710645e3035b288a40633b5a9424a5 height=363727 log2_work=83.025517 tx=74421062 date=2015-07-04 02:02:52 progress=0.999999 cache=266.5MiB(114242tx)
2015-07-04 02:05:19 UpdateTip: new best=000000000000000015a904dd0cf81bfb13b0bdfe65a30caafd9c85d9c5b1b318 height=363728 log2_work=83.025548 tx=74421355 date=2015-07-04 02:04:22 progress=0.999999 cache=266.6MiB(114406tx)
2015-07-04 02:05:54 UpdateTip: new best=000000000000000011e40c5deb1a1e3438b350ea3db3fa2dedd285db9650a6e6 height=363729 log2_work=83.025579 tx=74421408 date=2015-07-04 02:05:13 progress=0.999999 cache=266.7MiB(114466tx)
2015-07-04 02:07:02 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 02:08:06 UpdateTip: new best=000000000000000006a320d752b46b532ec0f3f815c5dae467aff5715a6e579e height=363730 log2_work=83.02561 tx=74421543 date=2015-07-04 02:07:38 progress=1.000000 cache=267.0MiB(114598tx)
2015-07-04 02:09:32 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 02:09:32 ERROR: invalid header received
2015-07-04 02:09:32 ProcessMessages(headers, 82 bytes) FAILED peer=191
2015-07-04 02:09:33 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 02:09:33 ERROR: ProcessNewBlock: AcceptBlock FAILED
2015-07-04 02:23:10 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 02:23:10 ERROR: invalid header received
2015-07-04 02:23:10 ProcessMessages(headers, 163 bytes) FAILED peer=191
2015-07-04 02:23:10 ERROR: AcceptBlockHeader: prev block not found
2015-07-04 02:23:10 ERROR: ProcessNewBlock: AcceptBlock FAILED
2015-07-04 02:23:10 Misbehaving: 86.125.113.54:8333 (0 -> 10)
2015-07-04 02:46:56 UpdateTip: new best=00000000000000000c28e23330c29046f19e817fe8fe039f4044b2b2882aef53 height=363731 log2_work=83.025641 tx=74423426 date=2015-07-04 02:46:13 progress=0.999999 cache=268.7MiB(116337tx)
2015-07-04 02:49:14 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 02:49:14 ERROR: invalid header received
2015-07-04 02:49:14 ProcessMessages(headers, 244 bytes) FAILED peer=191
2015-07-04 02:49:14 ERROR: AcceptBlockHeader: prev block not found
2015-07-04 02:49:14 ERROR: ProcessNewBlock: AcceptBlock FAILED
2015-07-04 02:49:14 Misbehaving: 86.125.113.54:8333 (10 -> 20)
2015-07-04 02:49:34 UpdateTip: new best=00000000000000001242e0216eb113f1c50e4c18ecfbc8b9c0224ec82ec391d6 height=363732 log2_work=83.025672 tx=74423842 date=2015-07-04 02:48:53 progress=0.999999 cache=268.7MiB(116505tx)
2015-07-04 02:52:22 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 02:52:22 ERROR: invalid header received
2015-07-04 02:52:22 ProcessMessages(headers, 325 bytes) FAILED peer=191
2015-07-04 02:52:22 ERROR: AcceptBlockHeader: prev block not found
2015-07-04 02:52:22 ERROR: ProcessNewBlock: AcceptBlock FAILED
2015-07-04 02:52:22 Misbehaving: 86.125.113.54:8333 (20 -> 30)
2015-07-04 02:57:00 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 02:57:00 ERROR: invalid header received
2015-07-04 02:57:00 ProcessMessages(headers, 406 bytes) FAILED peer=191
2015-07-04 02:57:00 ERROR: AcceptBlockHeader: prev block not found
2015-07-04 02:57:00 ERROR: ProcessNewBlock: AcceptBlock FAILED
2015-07-04 02:57:00 Misbehaving: 86.125.113.54:8333 (30 -> 40)
2015-07-04 03:06:03 ERROR: ContextualCheckBlockHeader : rejected nVersion=2 block
2015-07-04 03:06:03 ERROR: invalid header received
2015-07-04 03:06:03 ProcessMessages(headers, 487 bytes) FAILED peer=191
2015-07-04 03:06:03 ERROR: AcceptBlockHeader: prev block not found
2015-07-04 03:06:03 ERROR: ProcessNewBlock: AcceptBlock FAILED
2015-07-04 03:06:03 Misbehaving: 86.125.113.54:8333 (40 -> 50)
2015-07-04 03:17:14 receive version message: /UMDCoinscope:0.0/: version 70002, blocks=346294, us=xxx, peer=215
2015-07-04 03:30:16 UpdateTip: new best=000000000000000006355c07b36bac6990cce128610d674851096b8c9745a3ee height=363733 log2_work=83.025703 tx=74425504 date=2015-07-04 03:29:43 progress=0.999999 cache=272.4MiB(118614tx)
2015-07-04 03:37:53 UpdateTip: new best=000000000000000015358ae1131062fa83081797bb4cec4df0b1e5a5d01c1936 height=363734 log2_work=83.025734 tx=74425908 date=2015-07-04 03:37:00 progress=0.999999 cache=272.5MiB(118967tx)
2015-07-04 03:41:03 UpdateTip: new best=00000000000000000695243f6ac9b713bb1faa32c0eab3fc73286a288a44abde height=363735 log2_work=83.025765 tx=74426076 date=2015-07-04 03:40:39 progress=1.000000 cache=272.5MiB(119124tx)
2015-07-04 03:41:10 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 03:42:01 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 03:43:10 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 03:46:06 UpdateTip: new best=000000000000000003bcf71307c6f8f4a7caa7b9b4a3bef3ffbdfb1f0284c733 height=363736 log2_work=83.025797 tx=74426309 date=2015-07-04 03:45:17 progress=0.999999 cache=272.6MiB(119392tx)
2015-07-04 03:49:22 UpdateTip: new best=0000000000000000014e7c854125e10dd123271359b2c006b7b291bc23b8ad15 height=363737 log2_work=83.025828 tx=74426475 date=2015-07-04 03:48:50 progress=1.000000 cache=272.6MiB(119512tx)
2015-07-04 03:55:05 UpdateTip: new best=000000000000000010b61f1f1a8e1e465ad7fd5515aaff03914dd2a44ead8f94 height=363738 log2_work=83.025859 tx=74426795 date=2015-07-04 03:54:43 progress=1.000000 cache=275.0MiB(120136tx)
2015-07-04 04:02:53 UpdateTip: new best=00000000000000000e605e9bd17bea7fbb3ae3a7796d41730e0b2d3e7053a1ac height=363739 log2_work=83.02589 tx=74426998 date=2015-07-04 04:01:51 progress=0.999999 cache=275.3MiB(120523tx)
2015-07-04 04:09:03 UpdateTip: new best=000000000000000008f4a0f3177497369268c9b51968b6514d8b1df592d84ed0 height=363740 log2_work=83.025921 tx=74427753 date=2015-07-04 04:08:44 progress=1.000000 cache=275.7MiB(120876tx)
2015-07-04 04:09:36 UpdateTip: new best=00000000000000000b9d7006b0a893302e02becbc2faf78e79e000bb51721db0 height=363741 log2_work=83.025952 tx=74427754 date=2015-07-04 04:08:56 progress=0.999999 cache=275.7MiB(120890tx)
2015-07-04 04:26:41 UpdateTip: new best=00000000000000000095b61b02313f2be6a9d0d21684421caaa032506a38bd5f height=363742 log2_work=83.025983 tx=74428839 date=2015-07-04 04:25:41 progress=0.999999 cache=288.5MiB(122413tx)
2015-07-04 04:33:10 UpdateTip: new best=00000000000000000d0d362a2fbb3c3e7c8c748cc169ea90663cd18a354bc09b height=363743 log2_work=83.026014 tx=74429192 date=2015-07-04 04:32:52 progress=1.000000 cache=289.3MiB(122720tx)
2015-07-04 04:37:33 UpdateTip: new best=0000000000000000090128120630af662602c48ca979810d291dad2134e156da height=363744 log2_work=83.026045 tx=74429410 date=2015-07-04 04:37:06 progress=1.000000 cache=289.5MiB(122905tx)
2015-07-04 04:37:33 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 04:54:46 UpdateTip: new best=00000000000000000fa43f76ae85695da67a762493d746aed1468dfe222b476e height=363745 log2_work=83.026076 tx=74430429 date=2015-07-04 04:54:38 progress=1.000000 cache=291.0MiB(123749tx)
2015-07-04 04:58:57 UpdateTip: new best=0000000000000000052cf224477d486438db79921dda61f5d4a83d10226e3229 height=363746 log2_work=83.026107 tx=74430668 date=2015-07-04 04:58:41 progress=1.000000 cache=291.3MiB(123901tx)
2015-07-04 05:01:53 UpdateTip: new best=0000000000000000076dd13c40bc1d505b95401fcad328e4c4aac62a4577614f height=363747 log2_work=83.026138 tx=74430930 date=2015-07-04 05:01:41 progress=1.000000 cache=291.4MiB(124117tx)
2015-07-04 05:01:57 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 05:02:21 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 05:02:26 ERROR: AcceptToMemoryPool: inputs already spent
2015-07-04 05:02:58 UpdateTip: new best=00000000000000000cd9e62f7724a64bdf6e8955b1545dd8f8413659ab421eb8 height=363748 log2_work=83.02617 tx=74431055 date=2015-07-04 05:02:42 progress=1.000000 cache=291.4MiB(124210tx)
2015-07-04 05:03:57 ERROR: AcceptToMemoryPool: inputs already spent