{
  "manageEntity": {
    "action": "Save",
    "entityId": "57705139",
    "entityType": "Track",
    "nonce": "0x76a00381eaae13d61d9f63264ef9a93299782cb8383f81a5b76ca228b012a2ee",
    "signature": "0xd523b8af973833a04579991148bb012229fee70d7db86570a9c4432bed13bda6680a6b63ee6ba857ee8f97bd1d4af4d7aef7016b82b849fc6c113c540564671e1c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}