{
  "manageEntity": {
    "action": "Save",
    "entityId": "99516",
    "entityType": "Track",
    "nonce": "0x3dabd7711c83e18961b6e9cc9dea3ac3b1d962b8975f28e8e0b310ae230248de",
    "signature": "0xb5d729fa02bc8b76a299e4cd6e334364c45612415fb24dae763747aecc445c6f14be3adcbbfd2a5819a4a460b1ed228c28552362be86021e76140b77829cc5f21c",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}