{
  "manageEntity": {
    "action": "Save",
    "entityId": "119887983",
    "entityType": "Track",
    "nonce": "1785588740701556323",
    "signature": "0x17e063e672c82062fe4400ba8db5d502b4941b14902d724187d4674874626c6f7e467687d983434543c2b40c58f5d160292871eb37cffdb79d0c5751d4b277df1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}