{
  "manageEntity": {
    "action": "Save",
    "entityId": "492031",
    "entityType": "Track",
    "nonce": "0x4d47e3919ebc3c8d9da9ca88aeb12999f94a18485ec7cd721a9550fefe3bf5a6",
    "signature": "0xacc60723dca40d927f5dd9a60aa4d150c576c635377f1108454eae3f640eb3102a189436f3fe86ce96bab60557b577294cfdee1fb957ed152c0e5a810b4903cc1b",
    "signer": "0x4Aa8154A33F33394BA8De574d71aC98Ba6A47D5a",
    "userId": "645720561"
  }
}