{
  "manageEntity": {
    "action": "Save",
    "entityId": "830900014",
    "entityType": "Track",
    "nonce": "0x71b9875d15067106b730cf7749666dde0eee829aef7ed1a151b8685ac6a8a1fc",
    "signature": "0x4905444c0097cbd8bd86b9d19a38b2cd24fc0afea9337cb23f3e78480149e23278910ce136125582fbf89a003385b90aba9ee08cef9a9d3dd8381ccb6e9a5bb61c",
    "signer": "0xEB85867F957F2FE571521B2EEdBEF6FB4Fd9FA42",
    "userId": "440680049"
  }
}