Ethereum - Arbitrum Cross Chain Atomic Swap

Take Alice exchanging ETH on Ethereum for Bob's SOL on Solana as an example.

Step 1: Preparation Phase

Both parties negotiate parameters:

• Swap amount (e.g., 1 ETH for 10 SOL)
• Time window: Time lock T1 on Ethereum, corresponding time lock T2 on Solana = T1/2 (e.g., 20 minutes locked on Ethereum, 10 minutes locked on Solana).

When Alice clicks the "Generate Secret" button, the system will automatically generate the Secret and Secret Hash.

Step 2: Create HTLC Transaction

Alice create an HTLC contract, locking 1 ETH on Ethereum, specifying:

• Value: 1 ETH
• Refund Address: Alice's address
• Recipient Address: Bob's address
• Secret Hash: The hash of the secret generated in Step 1
• Timelock: Alice can refund ETH after 20 minutes

Alice sends Secret Hash to Bob through the information channel. Note that Bob can only claim the ETH if he obtains Secret, so as long as Alice does not send Secret to Bob, Alice's funds remain secure.

After receiving Secret Hash, Bob checks whether Alice has locked 1 ETH and whether all parameter settings are correct. If any discrepancies are found, Bob can choose to take no action to abort the transaction. If everything is confirmed to be correct, Bob can proceed to the next step.

Bob create an HTLC contract, locking 10 SOL on Solana, specifying:

• Value: 10 SOL
• Refund Address: Bob's address
• Recipient Address: Alice's address
• Secret Hash: The hash of the secret generated in Step 1
• Timelock: Bob can refund SOL after 10 minutes

Step 3: Execute Atomic Swap

Alice claim SOL on Solana

• Alice submits Secret to the HTLC on Solana. After successful verification, she receives 10 SOL, and Secret is recorded on the Solana blockchain.

Bob claim ETH on Ethereum

• Bob obtains Secret and submits it to the HTLC on Ethereum. After successful verification, he receives 1 ETH.