BETA
Back to courses
Share

Avalanche Interchain Messaging

Learn about Interchain Messaging, the interoperability protocol of Avalanche. In this course, you will learn how to build cross-L1 Solidity dApps with Interchain Messaging and Avalanche Warp Messaging.

Avalanche

Posted on May 8, 2025 18:23 · Latest update on May 12, 2025

Why Take This Course?

A significant innovation in blockchain is the development of multi-chain systems, like Avalanche, which provide a significant improvement in scalability, interoperability, and flexibility. At the core of these multi-chain systems is the ability to run multiple blockchains that communicate. Each chain's VM is optimized for specialized use cases, thereby boosting the network's overall performance.

Cross-chain communication is a crucial building block of multi-chain systems. Utilizing Interchain Messaging and Avalanche Warp Messaging is an incredible easy way to build cross-L1 dApps, since developers can build on top an extensive and audited development framework.

Course Content

  • Interoperability

In the first section, we cover some basic concepts of interoperability in multi-chain systems. You will learn about examples of interoperability between blockchains and the terms "source," "destination," and "message."

  • Avalanche Interchain Messaging

In this section, we learn what Avalanche Interchain Messaging is and what is abstracted away from the general dApp developer. You will also build your first cross-L1 dApps.

  • Securing Cross-Chain Communication

In this section, we look at techniques to secure cross-chain communication. We dive into signature schemes, multi-signature schemes, and the BLS multi-signature scheme.

  • Avalanche Interchain Messaging Protocol

Avalanche blockchains can natively interoperate between one another using AWM. You will learn about the AWM message format and how the message flow works.

You will need a general understanding of Software Development. You won't have to write a lot of code, but you will have to understand some. Therefore, we recommend:

  • Solidity: Familiarity with most concepts of the language. All exercises will mainly consist of writing cross-subnet dApps in Solidity.

  • Docker: The advanced exercises in the latter part of the course will occur in contained environments for easy setup. It will help if you're generally familiar with the concept of containerization, docker, and docker compose.

  • Testing: Having some experience or familiarity with unit testing is ideal.

Overall, this course aims to provide an advanced understanding of Teleporter. By completing this course, students will be better prepared to build advanced cross-Avalanche L1 blockchain applications.

Chapters

12 Chapters / 71 Lessons / 12H 44Mins

  • Chapters
  • Lessons
  • Duration
  • Progress
Chapter 1Interoperability between Blockchains
5
32Mins

Interoperability between blockchain

5Mins

Source, Message and Destination

10Mins

Recap of Multi-Chain Networks

10Mins

Interoperability in Multi-Chain Systems

5Mins

Finality Importance in Interoperabile Systems

2Mins

Chapter 2Avalanche Starter Kit
7
1H 54Mins

Avalanche Starter Kit

2Mins

Set Up Avalanche Starter Kit

15Mins

Close and Reopen Codespace

2Mins

Create a Blockchain

30Mins

Networks

5Mins

Foundry Quickstart

30Mins

Pause and Resume

30Mins

Chapter 3Interchain Messaging Basics
8
1H 49Mins

ICM Basics

7Mins

Recap of Bytes, Encoding and Decoding

20Mins

Sending a Message

15Mins

Sender Contract

30Mins

Receiving a Message

15Mins

Receiver Contract

15Mins

Send a Message

5Mins

Adapt the contract

2Mins

Chapter 4Two-Way Communication
7
47Mins

Two-Way Communication

10Mins

Sender Contract

10Mins

Create the Sender Contract

10Mins

Receiver Contract

5Mins

Create the Receiver Contract

5Mins

Send a Roundtrip Message

5Mins

Adapt the Contracts

2Mins

Chapter 5Invoking Functions
7
1H 0Min

Invoking Functions

3Mins

Encoding of multiple Values

10Mins

Create Simple Calculator Sender

10Mins

Create Simple Calculator Receiver

10Mins

Call simple Calculator

5Mins

Encoding the Function Name

20Mins

Extend the Calculator

2Mins

Chapter 6Interchain Messaging Registry
5
1H 0Min

Interchain Messaging Registry

10Mins

How the ICM Registry works

10Mins

Interact with the ICM Registry

20Mins

Retrieving Interchain Messenger from the Registry

10Mins

Verify if Sender is Interchain Messaging

10Mins

Chapter 7Securing Cross-Chain Communication
7
45Mins

Securing Cross-Chain Communication

5Mins

Signature Schemes

20Mins

Use a Signature Scheme

-

Multi-Signature Schemes

5Mins

Signature & Key Aggregation

5Mins

Use a Multi-Signature Scheme

-

Trusted Third Parties

10Mins

Chapter 8Avalanche Warp Messaging
9
1H 37Mins

Avalanche Warp Messaging

12Mins

Recap P-Chain

5Mins

Warp Message Format

10Mins

AWM Relayer

15Mins

Dataflow

10Mins

Message Pickup

20Mins

Message Delivery

15Mins

Load Considerations

5Mins

Trust Assumptions

5Mins

Chapter 9Running a Relayer
6
1H 10Mins

Running a Relayer

10Mins

Control the Avalanche CLI Relayer

5Mins

Install the AWM Relayer

10Mins

Configuration

20Mins

Two-Way Messaging Configuration

20Mins

Relayer Logs

5Mins

Chapter 10Restricting-the-relayer
2
15Mins

Restricting a Relayer

5Mins

Allowed Relayer

10Mins

Chapter 11Incentivizing a Relayer
7
1H 25Mins

Incentivizing a Relayer

10Mins

Fee Data Flow

15Mins

Determining the Fee

10Mins

Setting Incentives

5Mins

Deploy Fee Token Contract

10Mins

Incentivize an AWM relayer

15Mins

Interaction Flow With Fees

20Mins

Chapter 12P-Chain Messaging
1
30Mins

Registering Validators

30Mins

Speaker

More

Resources

  • Testnet FaucetHOT
  • Forum
  • Product Docs

Product

  • Learn
  • Build
  • Developer Profile
  • Feedback
  • On-Chain Contract & Payment

Community

  • Discord
  • Twitter
  • GitHub
  • Telegram
  • LinkedIn
  • Substack

Company

  • Apply for Cooperation
  • Terms of Use Agreement
  • Privacy Policy
  • Press Kit

© 2025 OpenBuild, All rights reserved.