{
  "manageEntity": {
    "action": "Save",
    "entityId": "399338531",
    "entityType": "Track",
    "nonce": "0x82094e8d1cca1a521041a82e14918efe924969444f5734735030fda40b808230",
    "signature": "0x95634b5af1cf59c8c98322b009dbecb884b123014aa4d84663c3d02246d2d2d15669e1e1fc8d4a43703fb6742281a669886186eaab3d76d583359426d04d0f3c1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}