Scroll

Instructions to set up your Scroll node.

Requirements

Setup your Axelar validator
Minimum hardware requirements: 8vcpu 32GB RAM, 1TB+ free storage space.
MacOS or Ubuntu 22.04 (tested on 22.04)
You will need access to a fully-synced Ethereum Mainnet RPC endpoint

Prerequisites

sudo apt-get update
sudo apt-get install build-essential -y && sudo apt-get install jq -y

Install go

Install Binaries

SCROLL_VERSION=scroll-v5.0.0

git clone https://github.com/scroll-tech/go-ethereum l2geth-source
cd l2geth-source
git checkout $SCROLL_VERSION
git branch
make nccc_geth
mv build/bin/geth /usr/bin/

ℹ️

Note: nccc stands for “no circuit capacity checker”. This feature disables an expensive block validation rule that is not crucial on follower nodes. We recommend that you do not enable it.

Check version

geth version

Create service

You will need access to a fully-synced Ethereum RPC endpoint before running scroll node.

L1_ENDPOINT="your synced Mainnet Ethereum Node"

L1_ENDPOINT="your synced Sepolia Ethereum Node"

Please consider opening port 30303 (UDP & TCP) and enabling discovery so that other nodes can sync data from your node. Note: The following settings will allow your node to be accessed publicly from any machine, adjust the flags according if you don’t prefer that.

sudo tee <<EOF >/dev/null /etc/systemd/system/geth.service
[Unit]
Description=geth daemon
After=network-online.target

[Service]
User=$USER
ExecStart=$(which geth) --scroll \
--datadir $HOME/.scroll
--gcmode archive --cache.noprefetch \
--http --http.vhosts "*" --http.addr "0.0.0.0" --http.port 8545 --http.api "eth,net,web3,debug,scroll" \
--l1.endpoint "$L1_ENDPOINT" --l1.confirmations "finalized" \
--ws --ws.origins '*' --ws.addr 0.0.0.0 --rollup.verify

Restart=always
RestartSec=3
LimitNOFILE=4096

[Install]
WantedBy=multi-user.target
EOF


cat /etc/systemd/system/geth.service

sudo tee <<EOF >/dev/null /etc/systemd/system/geth.service
[Unit]
Description=geth daemon
After=network-online.target

[Service]
User=$USER
ExecStart=$(which geth) --scroll-sepolia \
--datadir $HOME/.scroll \
--gcmode archive --cache.noprefetch \
--http --http.vhosts "*" --http.addr "0.0.0.0" --http.port 8545 --http.api "eth,net,web3,debug,scroll" \
--l1.endpoint "$L1_ENDPOINT" --l1.confirmations "finalized" \
--ws --ws.origins '*' --ws.addr 0.0.0.0 --rollup.verify

Restart=always
RestartSec=3
LimitNOFILE=4096

[Install]
WantedBy=multi-user.target
EOF


cat /etc/systemd/system/geth.service

Start the service

sudo systemctl enable geth.service
sudo systemctl daemon-reload
sudo systemctl restart geth.service

Check logs

# change log settings to persistent if not already
sed -i 's/#Storage=auto/Storage=persistent/g' /etc/systemd/journald.conf
sudo systemctl restart systemd-journald

journalctl -u geth.service -f -n 100 -o cat

Logs should appear like this

INFO [09-08|09:19:52.594] Starting L1 message sync service         latestProcessedBlock=4,038,000
WARN [09-08|09:19:52.726] Running initial sync of L1 messages before starting l2geth, this might take a while...


INFO [09-08|09:20:02.927] Syncing L1 messages                      processed=4,046,800 confirmed=4,246,270 collected=29 progress(%)=95.302
INFO [09-08|09:20:12.924] Syncing L1 messages                      processed=4,055,600 confirmed=4,246,270 collected=70 progress(%)=95.510
INFO [09-08|09:20:22.891] Syncing L1 messages                      processed=4,064,400 confirmed=4,246,270 collected=91 progress(%)=95.717
INFO [09-08|09:20:32.846] Syncing L1 messages                      processed=4,074,300 confirmed=4,246,270 collected=104 progress(%)=95.950
INFO [09-08|09:20:42.872] Syncing L1 messages                      processed=4,083,100 confirmed=4,246,270 collected=105 progress(%)=96.157
INFO [09-08|09:20:52.929] Syncing L1 messages                      processed=4,091,900 confirmed=4,246,270 collected=115 progress(%)=96.365
INFO [09-08|09:22:52.844] Syncing L1 messages                      processed=4,153,800 confirmed=4,246,270 collected=324,919 progress(%)=97.822

Wait for to sync L1 messages, and then it should start syncing scroll blockchain

INFO [09-08|09:25:25.840] L1 message initial sync completed        latestProcessedBlock=4,246,270
INFO [09-08|09:25:25.841] created new worker                       CircuitCapacityChecker ID=4,589,695,372,138,917,397
INFO [09-08|09:25:25.841] Gasprice oracle is ignoring threshold set threshold=2
WARN [09-08|09:25:25.841] Error reading unclean shutdown markers   error="leveldb: not found"
INFO [09-08|09:25:25.842] Starting peer-to-peer node               instance=Geth/v4.3.51-sepolia-b0657a7e/linux-amd64/go1.20.2
INFO [09-08|09:25:25.842] Stored checkpoint snapshot to disk       number=0 hash=aa62d1..68592c
INFO [09-08|09:25:25.902] New local node record                    seq=1,694,157,925,901 id=139edc25676eebb7 ip=127.0.0.1 udp=30303 tcp=30303
INFO [09-08|09:25:25.903] Started P2P networking                   self=enode://923ac5fd77cce78a69a20952fa0b40046391838a332308a986041ad2c20c4d20bb9c406594c713bf8f3004b02883857a598557cad2306cba50035b19967558b3@127.0.0.1:30303
INFO [09-08|09:25:25.904] IPC endpoint opened                      url=$HOME/.scroll/geth.ipc
INFO [09-08|09:25:25.904] HTTP server started                      endpoint=[::]:8545 prefix= cors= vhosts=localhost
INFO [09-08|09:25:27.418] New local node record                    seq=1,694,157,925,902 id=139edc25676eebb7 ip=65.108.239.113 udp=30303 tcp=30303
INFO [09-08|09:25:35.905] Block synchronisation started

INFO [09-08|09:25:40.599] Downloader queue stats                   receiptTasks=0 blockTasks=188 itemSize=65.70B throttle=8192
INFO [09-08|09:25:40.599] Imported new chain segment               blocks=1 txs=0 mgas=0.000 elapsed="453.99µs" mgasps=0.000 number=1 hash=d69ae1..807f83 age=1mo2d1h  dirty=0.00B
INFO [09-08|09:25:40.868] Imported new chain segment               blocks=3 txs=21 mgas=19.581 elapsed=79.813ms   mgasps=245.340 number=4 hash=8294c2..bdfb74 age=1mo2d1h  dirty=0.00B
INFO [09-08|09:25:41.090] Imported new chain segment               blocks=11 txs=42 mgas=13.973 elapsed=115.365ms  mgasps=121.115 number=15 hash=ba47c5..c13147 age=1mo2d52m dirty=0.00B
INFO [09-08|09:25:41.200] Imported new chain segment               blocks=22 txs=39 mgas=10.720 elapsed=110.598ms  mgasps=96.926  number=37 hash=afc4e6..d642f3 age=1mo2d36m dirty=0.00B
INFO [09-08|09:25:41.823] Imported new chain segment               blocks=233 txs=237 mgas=15.103 elapsed=621.685ms  mgasps=24.293  number=270 hash=8c6dd0..bb850e age=1mo1d23h dirty=0.00B

Verify

Method 1:

curl -X POST $YOUR_IP:8545 -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' | jq

If you get something like this in response of the above rpc call, your node is setup correctly

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "currentBlock": "0x2d44",
    "highestBlock": "0x8d0eb",
    "knownStates": "0x0",
    "pulledStates": "0x0",
    "startingBlock": "0x0"
  }
}

Wait for "result" to become false before using it in vald config

{"jsonrpc":"2.0","id":1,"result":false}

Method 2:

You can also check your status by connect to geth console

geth attach http://localhost:8545
eth.syncing

If you get something like this in response, your node is setup correctly

{
  currentBlock: 14555,
  highestBlock: 577771,
  knownStates: 0,
  pulledStates: 0,
  startingBlock: 0
}

Wait for it to become false before using it in vald config

eth.syncing
false

Endpoint

echo "${YOUR_IP}:8545"

Configure vald

In order for vald to connect to your Binance Smart Chain node, your rpc_addr should be exposed in vald’s config.toml

[[axelar_bridge_evm]]
name = "scroll"
rpc_addr = "http://IP:PORT"
start-with-bridge = true

[[axelar_bridge_evm]]
name = "scroll"
rpc_addr = "http://IP:PORT"
start-with-bridge = true

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