{
  "manageEntity": {
    "action": "Save",
    "entityId": "433809848",
    "entityType": "Track",
    "nonce": "0x4898f04e72a4931b025b52e7d98f3792895a53f85e2b3d8dc158318be7928e01",
    "signature": "0xbac438ccdd98b1c40c0295386fc74ed348599d9088a1cd09366c250bb5642b416cae2c488fa140a4c078a82271c04854f23d060bf9e92437dae390ef94943bfa1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}