# State sync

<figure><img src="https://github.com/takeshi-val/Logo/raw/main/chain4energy.png" alt="" width="150"><figcaption></figcaption></figure>

{% hint style="info" %}
State Sync allows a new node to join the network by fetching a snapshot of the application state at a recent height instead of fetching and replaying all historical blocks. Since the application state is generally much smaller than the blocks, and restoring it is much faster than replaying blocks, this can reduce the time to sync with the network from days to minutes.
{% endhint %}

## Instructions

### Stop the service and reset the data

```bash
sudo systemctl stop c4ed
c4ed tendermint unsafe-reset-all --home $HOME/.c4e-chain
```

### Get and configure the state sync information

```bash
STATE_SYNC_RPC=https://rpc-c4e.takeshi.team:443

LATEST_HEIGHT=$(curl -s $STATE_SYNC_RPC/block | jq -r .result.block.header.height)
SYNC_BLOCK_HEIGHT=$(($LATEST_HEIGHT - 2000))
SYNC_BLOCK_HASH=$(curl -s "$STATE_SYNC_RPC/block?height=$SYNC_BLOCK_HEIGHT" | jq -r .result.block_id.hash)

echo $LATEST_HEIGHT $SYNC_BLOCK_HEIGHT $SYNC_BLOCK_HASH 

sed -i \
  -e "s|^enable *=.*|enable = true|" \
  -e "s|^rpc_servers *=.*|rpc_servers = \"$STATE_SYNC_RPC,$STATE_SYNC_RPC\"|" \
  -e "s|^trust_height *=.*|trust_height = $SYNC_BLOCK_HEIGHT|" \
  -e "s|^trust_hash *=.*|trust_hash = \"$SYNC_BLOCK_HASH\"|" \
  $HOME/.c4e-chain/config/config.toml

```

### Restart the service and check the log

```bash
sudo systemctl start c4ed && sudo journalctl -u c4ed -f 
```


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