Slides used during the "Connecting to EVM from ICP Canisters" workshop during the Internet Computer BUIDL Bitcoin Hackathon Powered by Encode (May 2023).

1. Connect to EVM Chains
• Content
• Connect to EVM Chains via ic-web3
• Communicate with EVM Contracts via Omnic

2. The Internet Computer
• Applications run in canisters (smart contracts)
• Canisters can make http calls
• Canister can fetch/post data from other chains
• Canisters can sign messages via threshold ECDSA
• Canister can sign tx of any chain with ECDSA support

3. ic-web3
• A library that helps you
connect to EVM chains inside
a canister
• Fetch info from EVM chains
• Sign EVM chain
transactions via t-ECDSA
• Send transactions to EVM
chains

4. Endpoint Canister
• A proxy canister to access
EVM chains
• Support Raw RPC calls
• Canister id: 3ondx-siaaa-
aaaam-abf3q-cai

5. How to use?

6. Reminders
• Avoid replica consensus issue:
• Remember to add `transform` function to your canister
• Fetch `block_height` before you make RPC calls
• Ensure authenticity: Fetch from multiple RPC providers and
compare the result
• Send Tx: sign the tx -> send the tx -> query tx result

7. What is
Powered by the Internet Computer, speci
fi
cally, canister smart contracts, threshold ECDSA & outbound http calls
A scalable and programmable crosschain messaging protocol

8. How It Works
Components

9. Legacy Architecture

10. Fully Onchain Architecture

11. How It Works
Application
Developers can build custom application
and message processing logic into their
application canister (programmability)

13. How to use Omnic
• Example Omnichain token: https://github.com/rocklabs-io/
omnichain-token
• Omnic token bridge: https://test.omnic.network
• Omnicscan: https://scan.omnic.network
• Omnic-js SDK: https://github.com/rocklabs-io/omnic-js

14. Powered by the Internet Computer
https://rocklabs.io
hello@rocklabs.io