{
  "manageEntity": {
    "action": "Save",
    "entityId": "1584750966",
    "entityType": "Track",
    "nonce": "0xca8fd3c9a5ae2c131f175ee5b2718bfc98449f8c9157f68de30c72437d410872",
    "signature": "0xa9788504fc6fd43599005fd8cebc4d9b81e9935b6b77a19fbbe1810563402b0b4ca58b37f37d7b062406a0a8687c18a93d0a967f6a3aaa4c46945c40f83f67c21c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}