{
  "manageEntity": {
    "action": "Save",
    "entityId": "396724749",
    "entityType": "Track",
    "nonce": "0xf3d20b74e4b1480236dc44a672ef33efd7ad6d5adc4c2bc6bd7fcd34567d7153",
    "signature": "0x74ae7b5bb3d9da2e9b0eea700f0c4db960a2ef92832b946ba90c0bfde3401ac12700176c493b1489e7a66bf3c772e70b7b827257c3583aa8258076b81ac5a0001b",
    "signer": "0xd489B786708CDd8661b152CFF27695dC12c8c0C9",
    "userId": "647391197"
  }
}