The chain event is emitted whenever the user’s chain network changes. It includes the chain ID the user switched to.

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Sample Payload

Here’s the payload of a typical call with most common fields removed: 
{
    "type": "chain", 
    "properties": {
        "chain_id": 1,
        "address": "0x8e6ca77a7e044ba836a97beb796c124ca3a6a154"
    }
}