{
  "manageEntity": {
    "action": "Save",
    "entityId": "370812896",
    "entityType": "Track",
    "nonce": "0xf41c9d4784d84e6a212019696a0ed61729c7ba1ce6b59bbfbbe24c789c5441a6",
    "signature": "0x93bc6dda527ffe64eb8fa5e351b4ae45cdb13080acebdd7c9b4bd070b56c32b11d5642e38edae98ba65357645f09fea79341da24ce3da81373c8b48bdec54ef31c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}