⌚State sync

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

Some blockchains do not yet know how to transfer wasm along with State sync. Download wasm if necessary

Important - different blockchains need a different amount of RAM to successfully start with State sync. Average 4 GB RAM

State sync

# stop the service and clear the database
systemctl stop babylond
babylond tendermint unsafe-reset-all --home $HOME/.babylond --keep-addr-book

# download wasm if necessary
curl -L https://share101.utsa.tech/babylon/wasm-babylon.tar.lz4 | lz4 -dc - | tar -xf - -C $HOME/.babylond --strip-components 2

# add peer
peers="6753432b9d802f4900070d5cd7154ebde5f4ccad@65.108.206.118:61456"
sed -i.bak -e "s/^persistent_peers *=.*/persistent_peers = \"$peers\"/" $HOME/.babylond/config/config.toml

SNAP_RPC=https://t-babylon.rpc.utsa.tech:443

LATEST_HEIGHT=$(curl -s $SNAP_RPC/block | jq -r .result.block.header.height); \
BLOCK_HEIGHT=$((LATEST_HEIGHT - 100)); \
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/.babylond/config/config.toml

after echo $LATEST_HEIGHT $BLOCK_HEIGHT $TRUST_HASH you should see something like this

# restart node
systemctl restart babylond && journalctl -u babylond -f -o cat