{
  "manageEntity": {
    "action": "Save",
    "entityId": "43731",
    "entityType": "Track",
    "nonce": "0xb0050c0711a63f158c5ea51315b2a67884d6cc5575bc177588dc62155ddf4dab",
    "signature": "0xb48a6bec4cd626617141fa460a688805296d172399719242d103c77fb8416fd66893471c1a0698a7e795081e58d86216a19ab54c21ffc22e0c32bdd88e681d401b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}