{
  "manageEntity": {
    "action": "Save",
    "entityId": "469878",
    "entityType": "Track",
    "nonce": "0x1e1fff28bb47a0cd091e14a4aac01a703dc71c51105948be529f6636c1fc9311",
    "signature": "0x4f51727da9b67f1d80c89b88b3b37876006d1f77e96e44150e04b86696983b316f43eaab246af11e093cf267d35619b8d7ffd641db02a3164ee0597843bb1fd21c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}