{
  "manageEntity": {
    "action": "Save",
    "entityId": "857550845",
    "entityType": "Track",
    "nonce": "0xc4974ba01dcd62d671d28c3915acb9230140e2ff21afe663b9e7dd92971182b7",
    "signature": "0xa579021cbcc7fa13681e37373039cbc8ea6e2f753141c1e0e437387e24abb11c029084dd02218548b84716f83d478a106bf76eb80b1a3e66195ce1874e0915e11c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}