| Name | Type | Description | Notes |
|---|---|---|---|
| signature | String | Verifies the message came from Google. The signature is created using ECDSA. | |
| protocol_version | String | Identifies which encryption/signing scheme created this message. In this way, the protocol can evolve over time if needed. If it is not set, assume ECv0. | |
| signed_message | String | A serialized JSON string containing the encryptedMessage, ephemeralPublicKey, and tag. To simplify the signature verification process, this value is serialized. |
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