{
  "manageEntity": {
    "action": "Save",
    "entityId": "502479500",
    "entityType": "Track",
    "nonce": "0x9102251cde4a097012e99ab843bed2767ea88b2413ce1234433b70d8d7c9358a",
    "signature": "0x1ef11bc7dd5742cf99ac1b36dee635c76a27d3b5877ac089f542dfc47c456cc50f514780996fdde22fcc76891a1ec5823710473e144b650c49d11c83bb4c2bc51c",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}