# Avalanche Warp Messaging ## Overview `Landslide Core` comes with built-in support for Avalanche Warp Messaging (AWM). AWM allows any Avalanche Subnet to quickly send arbitrary messages to another Subnet, without relying on a trusted relayer or bridge. This is made possible by utilizing the validators of the sending Subnet. The messages are delivered in just a few seconds, or even less. You can find more information about AWM and how it functions on this [page](https://docs.google.com/presentation/d/1eV4IGMB7qNV7Fc4hp7NplWxK_1cFycwCMhjrcnsE9mU/edit).

{% @mermaid/diagram content="sequenceDiagram Actor Sender Note right of Sender: Create ExportTX message:
\*Source chain
\*Destination chain
\*Recipient address
\*amount Sender->>Subnet A: sign message Activate Subnet A\ Note right of Subnet A: Create Payload:
\*Source chain
\*Destination chain
\*Recipient address
\*amount Subnet A->>Subnet A:\ Note right of Subnet A: Create UnsignedMessage:
\*Source chain
\*Destination chain
\*Payload
Subnet A->>Avalanche: Calls NewUnsignedMessage
using WARP (Go module call) Avalanche->>Subnet A: Returns WARP unsigned Subnet A->>Subnet A: Save message into state Subnet A->>Sender: Returns Tx ID deactivate Subnet A participant Subnet A participant Subnet B actor Receiver Sender->>Receiver: Shares Tx ID Note left of Receiver: Provides list of URIs
of subnet A Validators
and Tx ID
Receiver->>Subnet B: Activate Subnet B Subnet B->>Subnet A: Query Unsigned Message and Signature by Tx ID Activate Subnet A Subnet A->>Subnet A: Get Unsigned message from state Subnet A->>Avalanche: Query Signature of Message activate Avalanche Note left of Avalanche: Validator keeps BLS private key
it uses this key to sign the Message
and Tx ID
Avalanche->>Subnet A: Returns Signature deactivate Avalanche Subnet A->>Subnet B: Returns Unsigned Message and Signature deactivate Subnet A Avalanche->>Subnet B: Get Validator Node Public Key Subnet B->>Subnet B: verifies Signature against Public Key Note left of Subnet B: \*Combines all Signatures together
Verifies that this signature was signed
by at least \[quorumNum/quorumDen]
of the validators of
\[msg.SourceChainID] at \[pChainHeight]. Subnet B->>Subnet B: Build and accept block deactivate Subnet B " %}