{
  "manageEntity": {
    "action": "Save",
    "entityId": "837378674",
    "entityType": "Track",
    "nonce": "0x03efdd87af8007ff1bc160e66b1f366d646cf841aad4a2dc6ba9c2c9c228d7e9",
    "signature": "0x62c8bef0062e648f714ae78f57164b28a031955bb6c17b072393b31b033d7f3d4d74f29ec61082d28c3e4c49241f3d2cd2e0ae7b51ca8bdacc79d25998148bc41c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}