Tsunagari/つながり

Table of Contents

• Overview
• Features
• Facets
• Deployment
• Testing
• License

Overview

Tsunagari (to connect) is a Diamond Standard (EIP-2535) EVM to EVM bridge smart contracts system written in Solidity and Yul, using the Forge framework.

Features

• Diamond Standard (EIP-2535) modular upgradeability
• Security by requiring a threshold amount of signatures (n of m)
• No reliance on a centralized service

Facets

• DiamondCutFacet: Manages the facets to be added, replaced, or removed.
• DiamondLoupeFacet: Read-only functions for querying the state of the diamond.
• GovernanceFacet: Manages the governance of the bridge.
• CalculatorFacet: Manages the mathematical calculations for the bridge.
• TokenManagerFacet: Manages the minting, burning, locking and unlocking of tokens.

Deployment

Deployment to local anvil blockchain network:

make deploy-diamond-anvil PK=<PRIVATE_KEY>

Deployment to testnet blockchain network:

make deploy-diamond-taiko PK=<PRIVATE_KEY>

or

make deploy-diamond-amoy PK=<PRIVATE_KEY>

Verify facets:

make verify-amoy PK=<PRIVATE_KEY>

or

make verify-taiko PK=<PRIVATE_KEY>

Testing

The smart contracts are tested with:

Unit tests: test coverage report can be generated with:

make report

Fuzz tests

Static code analysis with Slither: static analysis report can be generated with:

make staic-check

_{Note: This requires slither analyzer to be installed.}

Formal verification with Certora: formal verification for the Fee calculation functionality can be run with:

make formal-verification CERTORAKEY=<CERTORA_KEY>

_{Note: This requires Certora key.}

License

This project is licensed under the MIT License:

MIT License

Copyright (c) 2024

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.