<p>It walks back a small number of blocks and re-verifies them, this ensures there's no obvious corruption and warms the cache. It takes a few tens of seconds at maximum on most hardware. You can adjust or effectively disable this using <code>checklevel=1</code>, but it is generally inadvisable to do so.</p>

CC BY-SA 4.0
2019-04-02T15:24:36.413Z
2019-04-02T15:24:36.413Z
Claris
<p>If so is there a way to prevent this from happening?</p>

<reindex>
Does bitcoind re-index or reverify downloaded blocks upon startup?
Jon Aird
# Does bitcoind re-index or reverify downloaded blocks upon startup?

(Asked by: username_0 on 2019-04-02)

If so is there a way to prevent this from happening?

**Tags:** reindex


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## 1 answers

### Answer by username_1 on 2019-04-02. Score: 2 | Accepted answer

It walks back a small number of blocks and re-verifies them, this ensures there's no obvious corruption and warms the cache. It takes a few tens of seconds at maximum on most hardware. You can adjust or effectively disable this using `checklevel=1`, but it is generally inadvisable to do so.


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