{
  "manageEntity": {
    "action": "Save",
    "entityId": "643452",
    "entityType": "Track",
    "nonce": "0xcdf1fe8e74d2a566cda7905e54d740ee9acfa501d59e2eb079c3f95535232858",
    "signature": "0x6a999002c5dbc35575f42675ad5bc7f8d250f8bc3f76913d949a42be38ac95dd7e33122e63d87350ae8f250d1b38e6029d2036d780fe3ff421e786a53d9413c21b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}