{
  "manageEntity": {
    "action": "Save",
    "entityId": "343243",
    "entityType": "Track",
    "nonce": "0x4b34d5a1f565a7a8c4879841249cd2adacced743c55c602978798f94b2573339",
    "signature": "0x7a7ae214848b0ace8ed6eff4ad5c16f5e17ee14d7c9a9ab4b23b6d910c5fe7dc2447536cf54512b163d2350bcc7fefc46e17054924293c4f71aa0a16c046d8bc1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}