{
  "manageEntity": {
    "action": "Save",
    "entityId": "657996998",
    "entityType": "Track",
    "nonce": "0x20597ea0f6231263b0351816f6ee666b515310078a185874c40a53628f64adb4",
    "signature": "0x0e37507b754dd4299b06d4ab03fb39fb30b1279332e7b60f6553cb257d6476c142c29b4eab94e39717494ba08aae5ae2b4f2d65d566dd95fa637f2179efd31101b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}