{
  "manageEntity": {
    "action": "Save",
    "entityId": "42615288",
    "entityType": "Track",
    "nonce": "0x4ba4774a6097c74838cf52951ea1df7cdefe0b2852b4f21068704ba17512da59",
    "signature": "0x2ba87c165e2a2fb563dff8d6719922be76defc5093c86377a225226f8e80992424ad3607459df0bd01d445532a63bf31ea38d2385cb89ee59b524fc7c94e57881c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}