{
  "manageEntity": {
    "action": "Save",
    "entityId": "1249397863",
    "entityType": "Track",
    "nonce": "0x0ca3a8f177ceeeb0602aba9a0508142a188f669f4c7681636078eb202e07a9fd",
    "signature": "0x50795bca9cab2e31fad52d478bf90a8a060ccef9ed35574ab7d2055bff059c8f0bf58b28f2d6a61622fbb1a680c6e30c1a66c66d102354674cb847efaf308d7f1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}