This rollup can be used to store messages on it. You have the functionality to store messages,get messages and get the timestamp of the message. If this is not the killer application, I don't know what is. Joking aside. This is far away from being a killer application.
Prepare your machine for running ethermint
cd $HOME
git clone https://github.com/celestiaorg/ethermint.git
cd ethermint
make install
Start ethermint
NAMESPACE_ID=$(openssl rand -hex 8)
DA_BLOCK_HEIGHT=$(curl https://celestia.rpc.waynewayner.de/block | jq -r '.result.block.header.height')
ethermintd start --rollkit.aggregator true --rollkit.da_layer celestia --rollkit.da_config='{"base_url":"http://localhost:26659","timeout":60000000000,"gas_limit":6000000,"fee":6000}' --rollkit.namespace_id $NAMESPACE_ID --rollkit.da_start_height $DA_BLOCK_HEIGHT
Install foundry
curl -L https://foundry.paradigm.xyz | bash
source ~/.bashrc
foundryup
Clone this repo
cd $HOME
git clone https://github.com/WayneWayner/wayne-mint-app.git
cd wayne-mint-app
The smart contract can be found here here
As a responsible developer, we test the contract beforehand, of course.
forge test -vv
If all tests passed we are going to deploy. Run the following to start anvil
anvil --port 9545
In another terminal we are setting up the env vars. In my case the following:
export ANVIL_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
export RPC_URL=http://127.0.0.1:9545
Now we deploy locally
forge script script/MessageStore.s.sol:MessageStoreScript --fork-url \
$RPC_URL --private-key $ANVIL_KEY --broadcast
If you see something like that you are good to go
##### anvil-hardhat
✅ Hash: 0x7a1ab37b9a5282cec019db964a14595a47a9b1b39fcd6de0dc3c106986d4e890
Contract Address: 0x5fbdb2315678afecb367f032d93f642f64180aa3
Block: 1
Paid: 0.001042312 ETH (260578 gas * 4 gwei)
Transactions saved to: /home/waynewayner/git/wayne-rollup/wayne-mint-app/broadcast/MessageStore.s.sol/31337/run-latest.json
==========================
ONCHAIN EXECUTION COMPLETE & SUCCESSFUL.
Total Paid: 0.001042312 ETH (260578 gas * avg 4 gwei)
Transactions saved to: /home/waynewayner/git/wayne-rollup/wayne-mint-app/broadcast/MessageStore.s.sol/31337/run-latest.json
Next we test our contract
cast send $CONTRACT_ADDRESS "setMessage(string)" "Hello World" --private-key $ANVIL_KEY --rpc-url $RPC_URL
# Output
blockHash 0x3bc27096bdc1177e9bbc24b94dd8405f348d000f554cd5a9223fcc4808a59308
blockNumber 2
contractAddress
cumulativeGasUsed 66727
effectiveGasPrice 3877171483
gasUsed 66727
logs []
logsBloom 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
root
status 1
transactionHash 0x3b285d3c0edb1658b51df410544cd0b0e7da10b9c1c93e7ec86acc0c39e433c2
transactionIndex 0
type 2
cast call $CONTRACT_ADDRESS "getMessage()(string)" --rpc-url $RPC_URL
# Output
Hello World
If you receive an Hello World the contract seems to be working.
Deploy it to the ethermint chain
PRIVATE_KEY=$(ethermintd keys unsafe-export-eth-key mykey --keyring-backend test)
forge script script/MessageStore.s.sol:MessageStoreScript --rpc-url http://localhost:8545 --private-key $PRIVATE_KEY --broadcast
# Output
[⠆] Compiling...
No files changed, compilation skipped
Script ran successfully.
EIP-3855 is not supported in one or more of the RPCs used.
Unsupported Chain IDs: 9000.
Contracts deployed with a Solidity version equal or higher than 0.8.20 might not work properly.
For more information, please see https://eips.ethereum.org/EIPS/eip-3855
## Setting up (1) EVMs.
==========================
Chain 9000
Estimated gas price: 4.175712892 gwei
Estimated total gas used for script: 338670
Estimated amount required: 0.00141418868513364 ETH
==========================
###
Finding wallets for all the necessary addresses...
##
Sending transactions [0 - 0].
⠁ [00:00:00] [#######################################################################################] 1/1 txes (0.0s)
Transactions saved to: /home/waynewayner/git/wayne-rollup/wayne-mint-app/broadcast/MessageStore.s.sol/9000/run-latest.json
##
Waiting for receipts.
⠉ [00:00:03] [###################################################################################] 1/1 receipts (0.0s)
##### evmos-testnet
✅ Hash: 0x5b60f3ac523a3e09e2a9bea8c1bb739268fc6f32ab88c66105d0e36d1e30ae5d
Contract Address: 0x8d8049b46572cc5864da74066354a724d88c6db7
Block: 5
Paid: 0.000915550758845756 ETH (260516 gas * 3.514374391 gwei)
Transactions saved to: /home/waynewayner/git/wayne-rollup/wayne-mint-app/broadcast/MessageStore.s.sol/9000/run-latest.json
==========================
ONCHAIN EXECUTION COMPLETE & SUCCESSFUL.
Total Paid: 0.000915550758845756 ETH (260516 gas * avg 3.514374391 gwei)
Transactions saved to: /home/waynewayner/git/wayne-rollup/wayne-mint-app/broadcast/MessageStore.s.sol/9000/run-latest.json
After you successfully deployed it to ethermint you can call the functions with the given contract address
export CONTRACT_ADDRESS=0x8d8049b46572cc5864da74066354a724d88c6db7
cast send $CONTRACT_ADDRESS "setMessage(string)" "Hello World" --private-key $PRIVATE_KEY --rpc-url http://localhost:8545
cast call $CONTRACT_ADDRESS "getMessage()(string)" --rpc-url http://localhost:8545
Thats it.
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