{
  "manageEntity": {
    "action": "Save",
    "entityId": "251894542",
    "entityType": "Track",
    "nonce": "0x74819d17bbc3df3455d4710892a898861f33f2f1394d2441a41a55856b00f003",
    "signature": "0xf449975552d56857f2fbf00d519d60f1efee695a30bf1f0c84ca2f85399b0adf4e82ca140d170eb913f00383ee5efcf9e9019cf05d584d2b7e12ffd3c945719c1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}