{
  "manageEntity": {
    "action": "Save",
    "entityId": "712299",
    "entityType": "Track",
    "nonce": "0x50d2eddba6e0a9ec46a44ac801571ef11b5635298047664637b979ae339c8881",
    "signature": "0xfe3badf9633e63f80b4e41822fe38d2e69979b4a7b0c5271f48677d21fb1303a1ce37afcf34fda0d6373b46671e1bcf8787a05afd3cf3f088c3a1fc2661a4e4a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}