the-bridge-message-standard

Presentation and solution description: https://hackmd.io/IZ0ta7_UQ1GUYl4WI__aKQ?view

We propose a bridge message standard to be applied across different bridges and chains. For a proof of concept we:

• bridge Toucan protocol (deployed on Polygon) TCO2 tokens with Regen Eco Credits

• using a bridge controller smart contract to connect with a Axelar bridge service connecting Polygon and Regen Ledger

• Regen Ledger as a Cosmos SDK with it's own token registry.

Code:

• https://github.com/regen-network/toucan-the-bridge: Bridge controller implementing The Bridge Message Standard

• https://github.com/robert-zaremba/ethamsterdam-the-bridge: fork of Regen Ledger (Cosmos SDK chain) with:

  • x/axelarbridge module implementing the The Bridge Message Standard.

  • x/ecocredits handler with custom logic handling the message to process TCO2 token registration.

  regen-ledger code diff: https://github.com/robert-zaremba/ethamsterdam-the-bridge/compare/regen-master...master

The solution can be also applied to any smart contract chain or Layer-2 (Evmos, Optimism, Juno, Agoric, Solana ....).

Details about the solution: https://hackmd.io/IZ0ta7_UQ1GUYl4WI__aKQ?view

Summary:

• we define a Message Protocol for Blockchain bridges.

• we implement it on Polygon using Solidity and Cosmos SDK (in Regen Ledger)

• we use Axelar as a transport (bridge) layer

• we utilize Axelar callContract functionality to send messages between EVM chains

• we utilize Interchain Accounts for recording message in Cosmos Chains.