Optimism Documentation

Supersim supports deposit transactions. It uses a very lightweight solution without the op-node derivation pipeline by listening directly to the TransactionDeposited events on the OptimismPortal contract and simply forwarding the transaction to the applicable L2. The execution engine used with Supersim must support the Optimism deposit transaction type.

`OptimismPortal`

When starting Supersim, the L1 contracts for each L2 chain are emitted as output to the console. The L1CrossDomainMessenger, L1StandardBridge, and OptimismPortal can be used to initiate deposits in the same manner as one would on a production network like OP Mainnet or Base.

Chain Configuration
-----------------------
L1: Name: Local  ChainID: 900  RPC: http://127.0.0.1:8545  LogPath: ...

L2: Predeploy Contracts Spec ( https://specs.optimism.io/protocol/predeploys.html )

  * Name: OPChainA  ChainID: 901  RPC: http://127.0.0.1:9545  LogPath: ...
    L1 Contracts:
     - OptimismPortal:         0x37a418800d0c812A9dE83Bc80e993A6b76511B57
     - L1CrossDomainMessenger: 0xcd712b03bc6424BF45cE6C29Fc90FFDece228F6E
     - L1StandardBridge:       0x8d515eb0e5F293B16B6bBCA8275c060bAe0056B0

  ...

If running Supersim in fork mode, the production contracts will be used for each of the forked networks.

Chain Configuration
-----------------------
L1: Name: mainnet  ChainID: 1  RPC: http://127.0.0.1:8545  LogPath: ...

L2: Predeploy Contracts Spec ( https://specs.optimism.io/protocol/predeploys.html )

  * Name: op  ChainID: 10  RPC: http://127.0.0.1:9545  LogPath: ...
    L1 Contracts:
     - OptimismPortal:         0xbEb5Fc579115071764c7423A4f12eDde41f106Ed
     - L1CrossDomainMessenger: 0x25ace71c97B33Cc4729CF772ae268934F7ab5fA1
     - L1StandardBridge:       0x99C9fc46f92E8a1c0deC1b1747d010903E884bE1

  * Name: mode  ChainID: 34443  RPC: http://127.0.0.1:9546  LogPath: ...
    L1 Contracts:
     - OptimismPortal:         0x8B34b14c7c7123459Cf3076b8Cb929BE097d0C07
     - L1CrossDomainMessenger: 0x95bDCA6c8EdEB69C98Bd5bd17660BaCef1298A6f
     - L1StandardBridge:       0x735aDBbE72226BD52e818E7181953f42E3b0FF21

   ...

Sample Deposit Flow

We’ll run through a sample deposit directly with the OptimismPortal using cast.

Run Supersim

  supersim

Observe OptimismPortal Contract Address

  ...
  * Name: OPChainA  ChainID: 901 ...
      L1 Contracts:
       - OptimismPortal: 0x37a418800d0c812A9dE83Bc80e993A6b76511B57
  ...

Send Deposit Transaction On L1

We’ll be using the first pre-funded account to send this deposit of 1 ether

cast send 0x37a418800d0c812A9dE83Bc80e993A6b76511B57 --value 1ether --rpc-url http://localhost:8545 --private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80

Verify With Supersim Logs

  INFO [11-28|13:56:06.756] OptimismPortal#depositTransaction chain.id=901 l2TxHash=0x592d6e13016751332115df1fce59904176bfe447854196ed1b97ee00f14be469

Next steps

See the transaction guides for more detailed information.
Questions about Interop? Check out collection of interop guides or check out this OP Stack interop design video walk-thru.
For more info about how OP Stack interoperability works under the hood, check out the specs.

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Deposit transactions

`OptimismPortal`

Sample Deposit Flow

Next steps

​OptimismPortal

​Sample Deposit Flow

​Next steps

`OptimismPortal`

Sample Deposit Flow

Next steps