> For the complete documentation index, see [llms.txt](https://utsa.gitbook.io/services/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://utsa.gitbook.io/services/mainnet/lumen/state-sync.md).

# State sync

{% hint style="info" %}
State sync allows a new node to join a network by fetching a snapshot of the network state at a recent height, instead of fetching and replaying all historical blocks
{% endhint %}

{% hint style="info" %}
Some blockchains do not yet know how to transfer wasm along with State sync. Download wasm if necessary
{% endhint %}

{% hint style="info" %}
Important - different blockchains need a different amount of RAM to successfully start with State sync. Average 4 GB RAM
{% endhint %}

## State sync

```shell
# stop the service and clear the database
systemctl stop lumend
rm -rf $HOME/.lumen/data/{application.db,evidence.db,snapshots,tx_index.db,blockstore.db,state.db}
```

```shell
# download wasm if necessary

```

```shell
# add peer
peers="546d284c7b7f7a717b06d17002f28ee746ded36f@144.76.29.90:26656"
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$peers\"/" $HOME/.lumen/config/config.toml
```

```shell
SNAP_RPC=https://m-lumen.rpc.utsa.tech:443

LATEST_HEIGHT=$(curl -s $SNAP_RPC/block | jq -r .result.block.header.height); \
BLOCK_HEIGHT=$((LATEST_HEIGHT - 1000)); \
TRUST_HASH=$(curl -s "$SNAP_RPC/block?height=$BLOCK_HEIGHT" | jq -r .result.block_id.hash)

echo $LATEST_HEIGHT $BLOCK_HEIGHT $TRUST_HASH

sed -i.bak -E "s|^(enable[[:space:]]+=[[:space:]]+).*$|\1true| ; \
s|^(rpc_servers[[:space:]]+=[[:space:]]+).*$|\1\"$SNAP_RPC,$SNAP_RPC\"| ; \
s|^(trust_height[[:space:]]+=[[:space:]]+).*$|\1$BLOCK_HEIGHT| ; \
s|^(trust_hash[[:space:]]+=[[:space:]]+).*$|\1\"$TRUST_HASH\"| ; \
s|^(seeds[[:space:]]+=[[:space:]]+).*$|\1\"\"|" $HOME/.lumen/config/config.toml
```

{% hint style="info" %}
after echo <mark style="color:blue;">$LATEST\_HEIGHT $BLOCK\_HEIGHT $TRUST\_HASH</mark> you should see something like this

![](/files/w1IV4t800fJ7DiYyTxd4)
{% endhint %}

```shell
# restart node
systemctl restart lumend && journalctl -u lumend -f -o cat
```


---

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