{
  "manageEntity": {
    "action": "Save",
    "entityId": "686345",
    "entityType": "Track",
    "nonce": "0x2a1ee6a8a6416c4444da8da5f5fd5d672dab45f816888852a62645bd5a42ef46",
    "signature": "0x56cfe9aaed73eb75ee5a1bf0af6deeafd49f4bea4c07b26255dbd940623c5d4b263587e05eeb27ffeab99351d0ec0e9781f621cf49682f0c69878d0b552396e91b",
    "signer": "0x4Aa8154A33F33394BA8De574d71aC98Ba6A47D5a",
    "userId": "645720561"
  }
}