{
  "manageEntity": {
    "action": "Save",
    "entityId": "2120597642",
    "entityType": "Track",
    "nonce": "0x3e796abcfaf9ed8f1016fa0de8be86b1be064df0efe1ee4f44502fd129dc19bc",
    "signature": "0x539055c3c4896f815d08fbee1b314dedfca626f73442d9400331bc35562edbbb1d4519520588534c1fc6b7363267e8345491698530e71891efa5afcab1fc71481c",
    "signer": "0xd85E4A094e4C057572A9D525C9737051A17ab609",
    "userId": "696716320"
  }
}