{
  "manageEntity": {
    "action": "Save",
    "entityId": "599615",
    "entityType": "Track",
    "nonce": "0x72ed55b7ef747bfbaaef9624ad056f3feea22fb81c35c9a3773996de0fadca6a",
    "signature": "0xc4f838b02b4227c2d68fb0c16a8e27b2387f190805491c5f4bb31e214062c2f932ad7c9921994f8108ab60ace050b4fe00201c36ffb99bf0e60c6557c8d2a1771c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}