{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557982381",
    "entityType": "Track",
    "nonce": "0x1002a8208f96b39102e9cd07ca1dcef11c0d7fe66781687adba17aca0897ece6",
    "signature": "0xabd06c2e6cd2b77bdae0b27074a0c4e40d1462d5db0913d8f4e39438836467fd2b96e4a668816a23486be11f39077d24f74c7c91970a8d9f0a98dc23159016971c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}