{
  "manageEntity": {
    "action": "Save",
    "entityId": "454785303",
    "entityType": "Track",
    "nonce": "0x9b197f5c44cf8b17d8f57b28c427ac7e1cc34481d854bfeb96c808f24ff55e57",
    "signature": "0xb76e1ed07d2d3b5cb5cbe1c2de8d3648efca46832e0ea61758a654332af4c9ce5e56cea42c2b1f7def70817f8d71b3cb6e38693806151e8a61110440a1060e2a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}