{
  "manageEntity": {
    "action": "Save",
    "entityId": "465977271",
    "entityType": "Track",
    "nonce": "0x45324882cefd725bc7785822610d3fd62f80528dbc8a115e222a245e2e3a0692",
    "signature": "0xccc1f11e851dadd55a034e25b12b8c5df5fd58681e0bb51802f65d2574bbdc4569672d34a1215ebde54cda1994a12a27eb092a522c7d2ee867cdb1bf3e70b7391c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}