{
  "manageEntity": {
    "action": "Save",
    "entityId": "809817269",
    "entityType": "Track",
    "nonce": "0xfc692a2044d018b11f1e3eba2bd5e0405dd32f1e04bb7a15e75aadaf49c85f61",
    "signature": "0x38cfcfc23b6cd3f83ad75f1b0cc78610fcf02113e188967d146ec454f6d017ba1f6e8f7cf9347b73d3ab0f1bb0aa8d90f663fda94e2826b965da4b394fef90c21c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}