Course chain
The course L1 and the reference rollup running on it.
Use a separate wallet.
Create a new MetaMask profile, or a separate browser profile, used only for the course.
Never import a course key into a wallet that holds real funds, and never use a wallet you use on any mainnet.
Nothing on the course chains has any value.
Explorer
Blocks, transactions and addresses on the course L1 Faucet
CRS on the reference L2 and a little ETH, for a fresh account
Blocks, transactions and addresses on the course L1 Faucet
CRS on the reference L2 and a little ETH, for a fresh account
The reference L2 in MetaMask
Where you send CRS between accounts.
Or add it by hand: network menu, "Add a custom network".
| Network name | ATBT reference L2 |
| RPC URL | https://l2.atbt.mtq.at |
| Chain ID | 90001 |
| Currency symbol | CRS |
| Block explorer URL | leave empty: the explorer shows the L1 only |
The course L1 in MetaMask
Where the course token, the bridge and each group's rollup contracts live. Its RPC needs your group's RPC key, from your group's hand-out on Moodle.
| Network name | ATBT course L1 |
| RPC URL | https://rpc.atbt.mtq.at/<your RPC key> |
| Chain ID | 1337 |
| Currency symbol | ETH |
| Block explorer URL | https://explorer.atbt.mtq.at |
MetaMask may already know chain ID 1337 as "Localhost 8545"; if it offers to add this RPC to that network instead, either works.
To see CRS on the L1, choose "Import tokens" on this network and paste the course token, 0x3AFaC564c6454f4DE13162ae9deb7fA349E209b5.
A first transfer
- In MetaMask, create a new account, or import a key that belongs to the course only.
- Paste its address into the faucet and claim. The CRS arrives on the reference L2 within about 20 seconds.
- Switch MetaMask to "ATBT reference L2" and send some CRS to another course account.