{
  "manageEntity": {
    "action": "Save",
    "entityId": "1898784902",
    "entityType": "Track",
    "nonce": "0x45dc34ca70625850617402613228cc3a398e450c790ae8f7ec7039d49e19d793",
    "signature": "0x815131ea01b676e52056d5cb2321d298b17d5692636cd5f19be3c504b393b5f8013099bfdbc593579bbe26bfe78103c29edefb132d4eb7ac44376450ac03fcaf1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}