{
  "manageEntity": {
    "action": "Save",
    "entityId": "1540298430",
    "entityType": "Track",
    "nonce": "0x4bf6f78336d81c009f8a3f319f01997464f1f0e66fac4f9c094987d2501cfc13",
    "signature": "0xeceb6d29bf972225ad2f0103c087866cbdced7801ad59e4af24a36ec11375fdb123a5ae27f6cdcf621513b72c2e66fd4a1f9974bec156772774ef4b526fb57901b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}