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Summary

Attempting to reindex a testnet node, or process the bootstrap fails at block 141000 with "incorrect proof of work"

Steps to reproduce

Start an existing, synced testnet node with -reindex option -or- try to sync a new testnet node (possibly using a bootstrap).

Expected behavior

Reindex or sync should complete normally.

Problematic behavior

Error message "incorrect proof of work" at block 141000 and the reindex/sync stops

Crown-core environment info

Ubuntu 16.04

Crown-core application info

v0.13.9.0-d5fd2fe3 (2019-06-21 15:57:45 +0300)

Relevant logs, dumps and/or screenshots

debug log contains

2019-08-14 12:11:44 ProcessNewBlock : ACCEPTED
2019-08-14 12:11:44 UpdateTip: new best=000000178a93cbd264e7e95d624b1e39465c951c63db1fa874f8438294d8ed1e  height=140999  log2_work=62.365628  tx=154695  date=2019-03-19 07:40:26 progress=1.000000  cache=30.5MiB(117467tx)
2019-08-14 12:11:44 ProcessNewBlock : ACCEPTED
2019-08-14 12:11:44 ERROR: ContextualCheckBlockHeader : incorrect proof of work
2019-08-14 12:11:44 ERROR: ProcessNewBlock : AcceptBlock FAILED
2019-08-14 12:11:49 Loaded 141000 blocks from external file in 345201ms
2019-08-14 12:11:49 Reindexing block file blk00001.dat...
2019-08-14 12:11:49 Reindexing finished
2019-08-14 12:11:49 ERROR: ContextualCheckBlockHeader : incorrect proof of work
2019-08-14 12:11:49 ERROR: ProcessNewBlock : AcceptBlock FAILED
2019-08-14 12:11:49 Misbehaving: 92.60.46.27:19340 (0 -> 100) BAN THRESHOLD EXCEEDED
2019-08-14 12:11:49 ERROR: ContextualCheckBlockHeader : incorrect proof of work
2019-08-14 12:11:49 ERROR: ProcessNewBlock : AcceptBlock FAILED

Drop full logs & dumps here: https://nextcloud.crown.tech/nextcloud/s/znd8HiiAsRX3C6B

Possible fixes

Workaround the issue by starting a new testnet node/wallet with a snapshot.

/cc @artem