{
  "manageEntity": {
    "action": "Save",
    "entityId": "1405484581",
    "entityType": "Track",
    "nonce": "0x65a9a4a47e40b0ec5cfda1de1b3832ccdba4b304df21f0c58b1557139f076d55",
    "signature": "0x7219e2fcc3b7df5765e9803b05686fb199984f8d2562d3d4a71cceb2dd44a0c32528d6ba7b74149d42edc13996b5781c41363e1fb856e260292b514202e547311c",
    "signer": "0x13Cfd4BBEDA7CE58184A2E10DA1080385Fc7829e",
    "userId": "433129386"
  }
}