{
  "manageEntity": {
    "action": "Save",
    "entityId": "221397",
    "entityType": "Track",
    "nonce": "0xe75dbd2c6f82896dea592bcaf4816f9af70d6013976cddeb815a869f5e3696ec",
    "signature": "0x115d8ee5bd4408ed4bbb541cd16a777aa91b39007620eb1b2cd80f8205eeaa9240f5cb458fb59ff8bd0cd8c43c28c5b0128c66616e68de016604e19527d444001b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}