{
  "manageEntity": {
    "action": "Save",
    "entityId": "1864445258",
    "entityType": "Track",
    "nonce": "0x6fcad8b0c508e9c532584c4409908b2f2af5c4b423758fa5eeee366462db5891",
    "signature": "0x19bf6e7b2aa92e9c0ab3a7a98396097db53e3ece6b5be3ceb6d583ad6a2af0df7b501992ba0ba26eea6378e30b6a675468ed1775be8738d8b040a0fd2fc730041b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}