{
  "manageEntity": {
    "action": "Save",
    "entityId": "817486688",
    "entityType": "Track",
    "nonce": "0x23b48b2dc15f58dbea8eab281e0a86d21abe737c76a68574c110877c0bb88e3c",
    "signature": "0x384557542664d6ec05d41607fb17be7cf3f1fc356437646961f439ac141ad55923aed0ed2f7a7f08f5f05c71223f20ae72579f0d40856bf269ef6a5cd44a1e3f1b",
    "signer": "0x4f9486253FaC362b5D6FdDc882f5406Efd9FcB25",
    "userId": "840551112"
  }
}