{
  "manageEntity": {
    "action": "Save",
    "entityId": "299898",
    "entityType": "Track",
    "nonce": "0x87cc85bd396034711dbdcfc1edd0285accde7a9297b359038af946af3fdf342a",
    "signature": "0x1e9102a7bc4cd8e28dfb331f64df02ceb7502fe6d0f98c676c76fd93127effb27fd8b2ea8528627077952225fad67a0225d71a90b3d3a0f156786000917420381c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}