Running BLAST Testnet from Source
Please follow these steps first if you have not done so already.
Create a shared secret between op-geth
and bl-node
op-geth
and bl-node
Navigate into your
op-geth
directory and run these commands:
openssl rand -hex 32 > jwt.txt
cp jwt.txt ../blast/bl-node
Scripts to start the different components
In the root of your working directory create a new directory: scripts
.
# op-geth
op-geth
Create a new file:
touch run-op-geth.sh
Make it executable:
chmod +x run-op-geth.sh
Insert this snippet of code into
run-op-geth.sh
and modify the path to theop-geth
directory.#! /usr/bin/bash SEQUENCER_URL=https://goerli-sequencer.blastblockchain.com/ cd <> ./build/bin/geth --datadir=./datadir --http --http.port=8545 --http.addr=0.0.0.0 --authrpc.addr=localhost --authrpc.jwtsecret=./jwt.txt --verbosity=3 --rollup.sequencerhttp=$SEQUENCER_URL --nodiscover --syncmode=full --maxpeers=0
Other Sequencer URLs can be found here: Networks, Public RPC Endpoints, & APIs.
Run the following command to start
op-geth
:./run-op-geth.sh
op-node
op-node
Navigate to the
scripts
directory you created.Create a new file:
touch run-bl-node.sh
Make it executable:
chmod +x run-bl-node.sh
Insert this snippet of code into
run-bl-node.sh
:#!/usr/bin/bash L1URL=<< L1 RPC URL >> L1KIND=basic cd <<Path to bl-node directory>> ./bin/bl-node \ --l1=$L1URL \ --l1.rpckind=$L1KIND \ --l2=ws://localhost:8551 \ --l2.jwt-secret=./jwt.txt \ --network=$NET \ --rpc.addr=0.0.0.0 \ --rpc.port=8547 \ --rollup.config=./rollup.json
Change
<< L1 RPC URL >>
to your local L1 node or a service provider's URL for the L1 node (L1 Ethereum). E.g. for Infura,https://goerli.infura.io/v3/API_KEY
.Set
L1KIND
to the network provider you are using (options: alchemy, quicknode, infura, parity, nethermind, debug_geth, erigon, basic, any).
Run the following command to start
op-node
:./run-op-node.sh
The initial synchronization
The datadir provided by Blast is not updated continuously, so before you can use the node you need a to synchronize it.
During that process you get log messages from bl-node
, and nothing else appears to happen.
INFO [06-26|13:31:20.389] Advancing bq origin origin=17171d..1bc69b:8300332 originBehind=false
That is normal - it means that bl-node
is looking for a location in the batch queue. After a few minutes it finds it, and then it can start synchronizing.
While it is synchronizing, you can expect log messages such as these from bl-node
:
INFO [06-26|14:00:59.460] Sync progress reason="processed safe block derived from L1" l2_finalized=ef93e6..e0f367:4067805 l2_safe=7fe3f6..900127:4068014 l2_unsafe=7fe3f6..900127:4068014 l2_time=1,673,564,096 l1_derived=6079cd..be4231:8301091
INFO [06-26|14:00:59.460] Found next batch epoch=8e8a03..11a6de:8301087 batch_epoch=8301087 batch_timestamp=1,673,564,098
INFO [06-26|14:00:59.461] generated attributes in payload queue txs=1 timestamp=1,673,564,098
INFO [06-26|14:00:59.463] inserted block hash=e80dc4..72a759 number=4,068,015 state_root=660ced..043025 timestamp=1,673,564,098 parent=7fe3f6..900127 prev_randao=78e43d..36f07a fee_recipient=0x4200000000000000000000000000000000000011 txs=1 update_safe=true
And log messages such as these from op-geth
:
INFO [06-26|14:02:12.974] Imported new potential chain segment number=4,068,194 hash=a334a0..609a83 blocks=1 txs=1 mgas=0.000 elapsed=1.482ms mgasps=0.000 age=5mo2w20h dirty=2.31MiB
INFO [06-26|14:02:12.976] Chain head was updated number=4,068,194 hash=a334a0..609a83 root=e80f5e..dd06f9 elapsed="188.373ยตs" age=5mo2w20h
INFO [06-26|14:02:12.982] Starting work on payload id=0x5542117d680dbd4e
#How long will the synchronization take?
To estimate how long the synchronization will take, you need to first find out how many blocks you synchronize in a minute. You can use this Foundry (opens new window)script to get an estimated sync time.
Navigate to your
scripts
directoryCreate a new file:
touch run-estimate.sh
Make it executable:
chmod +x run-estimate.sh
Insert this snippet of code into
run-estimate.sh
:
#!/usr/bin/bash
export ETH_RPC_URL=http://localhost:8545
CHAIN_ID=`cast chain-id`
echo Chain ID: $CHAIN_ID
echo Please wait
if [ $CHAIN_ID -eq 238 ]; then
L2_URL=https://rpc.blastblockchain.com
fi
if [ $CHAIN_ID -eq 23888 ]; then
L2_URL=https://testnet-rpc.blastblockchain.com
fi
T0=`cast block-number --rpc-url $ETH_RPC_URL` ; sleep 60 ; T1=`cast block-number --rpc-url $ETH_RPC_URL`
PER_MIN=`expr $T1 - $T0`
echo Blocks per minute: $PER_MIN
if [ $PER_MIN -eq 0 ]; then
echo Not synching
exit;
fi
# During that minute the head of the chain progressed by thirty blocks
PROGRESS_PER_MIN=`expr $PER_MIN - 30`
echo Progress per minute: $PROGRESS_PER_MIN
# How many more blocks do we need?
HEAD=`cast block-number --rpc-url $L2_URL`
BEHIND=`expr $HEAD - $T1`
MINUTES=`expr $BEHIND / $PROGRESS_PER_MIN`
HOURS=`expr $MINUTES / 60`
echo Hours until sync completed: $HOURS
if [ $HOURS -gt 24 ] ; then
DAYS=`expr $HOURS / 24`
echo Days until sync complete: $DAYS
fi
Run the following command to get an estimate:
./run-estimate.sh
#Operations
It is best to start op-geth
first and shut it down last.
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