{
  "manageEntity": {
    "action": "Save",
    "entityId": "240304",
    "entityType": "Track",
    "nonce": "0x8c4729596719736c50b9878793f5e40f4d363977e1f80c81cb77bb9479b545da",
    "signature": "0x70acb4179ac56d27e543caa1e5ae38b76361fc1c322ce887fcc2751e7744be606a8b257e625c0f48d254f47055741aff7e94f5e25e7a0b1c05a597d263003ca21b",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}