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[Merged by Bors] - Add community checkpoint sync endpoints to book #3558

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[Merged by Bors] - Add community checkpoint sync endpoints to book #3558

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7 changes: 7 additions & 0 deletions book/src/checkpoint-sync.md
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Expand Up @@ -41,6 +41,13 @@ Once the checkpoint is loaded Lighthouse will sync forwards to the head of the c
If a validator client is connected to the node then it will be able to start completing its duties
as soon as forwards sync completes.

### Use a community checkpoint sync endpoint

The Ethereum community provides various [public endpoints](https://eth-clients.github.io/checkpoint-sync-endpoints/) for you to choose from for your initial checkpoint state. Select one for your network and use it as the url for the `--checkpoint-sync-url` flag. e.g.
```
lighthouse bn --checkpoint-sync-url https://beaconstate.info/ ...
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@InvisibleSymbol InvisibleSymbol Sep 9, 2022 •
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I feel like People might just end up copying this line out of laziness and all end up using this specific endpoint, which is sub-optimal from a safety perspective (no single checkpoint endpoint should be recommended). How about using a non-working domain instead, like example.com?

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that's a good point, I'm happy to merge that change if you or @remyroy would like to PR it (assuming no objections?)

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I'm good with @InvisibleSymbol suggestion. Let me do another PR.

```

### Use Infura as a remote beacon node provider

You can use Infura as the remote beacon node provider to load the initial checkpoint state.
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