{
  "manageEntity": {
    "action": "Save",
    "entityId": "844591900",
    "entityType": "Track",
    "nonce": "0x5cfe273e1682d3601499855203ee9f1c50d9d2fac440c72e48eeeae5e26bdb5a",
    "signature": "0x2bca044f4c7071eac2a9d1cbb98ae5aa747215188e899e9c66c6fd87eb184b05678e5a631bff7981f6244007ec0f368505fe6a3dbc1abdc30d4c4dd6efd4dd911c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}