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# BlockchainSync.Update.State.syncing

Actively fetching and validating blocks. Emitted once per
successfully validated block — [`tip`](/documentation/BitcoinKernel/BlockchainSync/Update/tip) advances monotonically,
[`remoteTip`](/documentation/BitcoinKernel/BlockchainSync/Update/remoteTip) advances whenever a re-poll catches source-side
growth.

```
case syncing
```