Challenge 3

Here is the next challenge for dev to dive into Polymer Labs with Universal Channel

The challenge will get you to find out the secret message from Polymer Contract

Prepare

Clone the Polymer's helper source code

git clone https://github.com/polymerdevs/testnet-challenge-3-template.git
cd testnet-challenge-3-template
cp .env.example .env

Then, you need to change the keys like the challenge 1

Doing

Run install

just install

Open your editor with the project you just cloned above, try to edit your contracts/CCQueryUC.sol

In function sendUniversalPacket try to encode the message with crossChainQuery then send packet through universal channel

bytes memory payload = abi.encode(msg.sender, "crossChainQuery");

uint64 timeoutTimestamp = uint64((block.timestamp + timeoutSeconds) * 1000000000);

IbcUniversalPacketSender(mw).sendUniversalPacket(
    channelId, IbcUtils.toBytes32(destPortAddr), payload, timeoutTimestamp
);

In function onUniversalAcknowledgement write some code to get and log secretMessage

ackPackets.push(UcAckWithChannel(channelId, packet, ack));

// decode the counter from the ack packet
(string memory _secretMessage) = abi.decode(ack.data, (string));

emit LogAcknowledgement(_secretMessage);

Just do it

Run the command

just run-challenge-3

Results

You should see somethings in the end of your command

Go server discord and show your proof

Proof

It will be in the tempalte

Wallet: (Your wallet address here)
Contract: (Find the title in console log "PACKET IS ACKNOWLEDGED", show the txHash url)

You also will need to send 2 images:

• Go Packet Zone: Paste your "PACKET HAS BEEN SENT" Txhash to here, then click the row then take a screenshot

• Use the url contract above: go to Logs tab and take a screenshot

End here, Good Luck!