{
  "manageEntity": {
    "action": "Save",
    "entityId": "1543990327",
    "entityType": "Track",
    "nonce": "1787491009989386828",
    "signature": "0x61f4b0d8059c341ac83b341430817a50e864cb787303e84f4f025a6f6390441479a38aa2f8d36dd353298e664ac32d670607ac411e113f56244ee325d116444e1c",
    "signer": "0x2cc593FC814461263d282A84286Fd4F72c79562e",
    "userId": "175201368"
  }
}