{
  "manageEntity": {
    "action": "Save",
    "entityId": "1240845726",
    "entityType": "Track",
    "nonce": "0x49a0a675bada83161b1c647a46c155578f780871298a0c21171d91420ebfc222",
    "signature": "0xcc248cfb28ebb6106755077a2860c72da1b29382ef34468594ec721b5f9633da2516a671628f3f44b7b1505ca8345ba0c9e6eeaee230453ca398c430009913071b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}