Warp Message Format

Warp Messages have a minimal message format that only contains the absolute necessary data for the transportation:

• NetworkID: The ID of the Network (Mainnet, Fuji Test Network, Local Test Network). This is included as a security mechanisms, so messages from the Fuji Test Network cannot be replayed on the Mainnet.
• SourceChainID: The chainID where the message originates from. This is not the EVM chain ID you may know from adding a network to a wallet, but the blockchain ID on the P-Chain. The P-Chain uses the transaction ID of the transaction that created those blockchain on the P-Chain for the chain ID, e.g.: 0xd7cdc6f08b167595d1577e24838113a88b1005b471a6c430d79c48b4c89cfc53
• SourceAddress: The address of the message sender
• Payload: The payload of the message

Every Warp message can be uniquely identified by its ID: the SHA256 hash of the serialized message (NetworkID, SourceChainID, SourceAddress & Payload).

The fields above are actually an UnsignedMessage. Hence, it has not been attached an aggregated signature yet. We will examine this in the following sections.