A basic Account Abstraction test with Alchemy aa-sdk

A basic Account Abstraction implementation with aa-sdk from Alchmy SDK following the AA Quick Start. This project aim to initiate a transaction with an EOA for a smart contract and not paying for gasfees.

Behaviour

• An authenticated user with an EOA initiate a transaction (because s•he wants to interact with smart contract) and sign it.
• The UserOp (read it UserOperation) is a meta-transaction containing a lot of informations and is sent to the Bundler.
• The Bundler gather multiple Userops from multiple EOA users, verify operations, bundle them in one transaction to save gaasfees and send them to the Entrypoint.
• The Entrypoint officiate and will calculate gasfees consumption and verify who will pay the Smart Contract Account, most of the time we can assign a contract called the Paymaster to pay the bills.
• The Paymaster will allow the Smart Contract Account to use the funds to operate changes onchain on behalf of the EOA.

TLDR

Smart Account Address:  0xF667523C4De2e9d6dB27Dce6Eb3b31217C234f5a
From 0xF667523C4De2e9d6dB27Dce6Eb3b31217C234f5a to 0x885D06b3630975EaA0f7313934224C2523a30B7d
UserOperation Hash:  0xe1f04ff4b9d9834dd1d7fd2ab71121b81f0cd254d2de00a0991bb604f3e80454
Transaction Hash:  0x0444baf9ba4f537e0d41a955ddbee6f30bc1f1cea4c53be988bcf3ff21849a58
✨  Done in 10.71s.

Here you can see that

1. We deployed a Smart Account Contract at 0xF667523C4De2e9d6dB27Dce6Eb3b31217C234f5a for the EOA 0x665D1C0F349eB3E8377D45A351D6212833478138 (cf use of private key in .env file).

   Look the Smart Account Address on Polygon Mumbai

2. The EOA initiated a transaction toward the address 0x885D06b3630975EaA0f7313934224C2523a30B7d.

   Check the EOA history on Polygon Mumbai explorer

3. The UserOp 0xe1f04ff4b9d9834dd1d7fd2ab71121b81f0cd254d2de00a0991bb604f3e80454 has been created.

   Check the UserOp on jiffyscan.xyz (an EIP-4337 UserOp Explorer)

4. The transaction 0x0444baf9ba4f537e0d41a955ddbee6f30bc1f1cea4c53be988bcf3ff21849a58 has been validated

   Check the Transaction on Mumbai explorer

5. The Mumbai Testnet official Paymaster has been used

   Check the Mumbaï Paymaster history

Resources

• YT - AA Series
• Gas Manager Deployment Addresses