{
  "manageEntity": {
    "action": "Save",
    "entityId": "789793074",
    "entityType": "Track",
    "nonce": "0x7f34b30b11ced59cb6afb6f7a9520965d8d19e928cbf5bf2d60022ed05c9b8dd",
    "signature": "0x90853888f180de030376eab32fb88b9e07779e6b8bd6d7d55eb2f1f3f33e8b1271c94b8a8eff65d575734d3564abc4d5ce40581eb366d5c8afbc7c3bef89d54f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}