{
  "manageEntity": {
    "action": "Save",
    "entityId": "972418550",
    "entityType": "Track",
    "nonce": "0x8c9ac9b1aa8ccdff079fc6b44350e3acb7e48ab12eeb8d91a7a15c1287046440",
    "signature": "0x4840a79e09e3a3d623edb5900570606347c7d36be7e8436a1a7bb642e2f13add708147ad1883f1d865783324a90b3112438c6b615b1d50e41012fdef2dc47e491c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}