--- description: |- Required when sent as an in-room message. Indicates the `m.key.verification.request` that this message is related to. Note that for encrypted messages, this property should be in the unencrypted portion of the event. properties: rel_type: type: string enum: - m.reference description: |- The relationship type. event_id: type: string description: |- The event ID of the `m.key.verification.request` that this message is related to. type: object title: VerificationRelatesTo