State Sync

state-sync is a feature that allows nodes to quickly sync their state by fetching a snapshot of the application state at a specific block height. This greatly reduces the time required for node to sync with the network, compared to the default method of replaying all blocks from the genesis block. An advantage of state-sync is that the database is very small in comparison to a fully synced node, therefore using state-sync to resync your node to the network can help keep running costs lower by minimizing storage usage.

• Note: A snapshot-enabled RPC and from a trusted block height is required for state-sync.

1. Set SNAP_RPC variable to the snapshot RPC

   • SNAP_RPC="https://testnet-rpc.side.one:443"

2. Fetch the LATEST_HEIGHT from the snapshot RPC, set the state-sync BLOCK_HEIGHT and fetch the TRUST_HASH from the snapshot RPC. The BLOCK_HEIGHT to sync is determined by subtracting the snapshot-interval from the LATEST_HEIGHT.

   LATEST_HEIGHT=$(curl -s $SNAP_RPC/block | jq -r .result.block.header.height); \
   BLOCK_HEIGHT=$((LATEST_HEIGHT - 2000)); \
   TRUST_HASH=$(curl -s "$SNAP_RPC/block?height=$BLOCK_HEIGHT" | jq -r .result.block_id.hash)

3. Check variables to ensure they have been set echo $LATEST_HEIGHT $BLOCK_HEIGHT $TRUST_HASH

4. Set the required variables in ~/.side/config/config.toml

   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\"|" $HOME/.side/config/config.toml

5. Stop the node and reset the node database

   WARNING: This will erase your node database. If you are already running validator, be sure you backed up your config/priv_validator_key.json and config/node_key.json prior to running unsafe-reset-all.
   It is recommended to copy data/priv_validator_state.json to a backup and restore it after unsafe-reset-all to avoid potential double signing.

6. Restart node and check logs

   sided tendermint unsafe-reset-all
   sided start