Optimism TON and upgradable TON bridge (forked from makerdao/optimism-dai-bridge)

This bridge stores funds in an external escrow account rather than on the bridge address itself. To upgrade, deploy new bridge independently and connect to the same escrow. Thanks to this, no bridge will ever run out of funds.

After deploying a new bridge you might consider closing the old one. The procedure is slightly complicated due to async messages like finalizeDeposit and finalizeWithdraw that can be in progress.

An owner calls L2Gateway.close() and L1Gateway.close() so no new async messages can be sent to the other part of the bridge. After all async messages are done processing (can take up to 1 week) bridge is effectively closed. Now, you can consider revoking approval to access funds from escrow on L1 and token minting rights on L2.

• L1Gateway.sol - L1 side of the bridge. Escrows L1 TON in L1Escrow contract. Unlocks L1 TON upon withdrawal message from L2Gateway.
• L2Gateway.sol - L2 side of the bridge. Mints new L2 TON after receiving a message from L1Gateway. Burns L2 TON tokens when withdrawals happen.
• L1Escrow - Holds funds on L1. Allows having many bridges coexist on L1 and share liquidity.
• L1GatewayRegistry - Manages l1 gateway and l2 gateway pair.

These scrips require valid .env file. Copy .env.example as .env and fill it out.

• scripts/deployKovan.js - deploys a full solution to kovan and optimism testnet on kovan. Run with npm run deploy:kovan

npm install
npm run test