{
  "manageEntity": {
    "action": "Save",
    "entityId": "1485903945",
    "entityType": "Track",
    "nonce": "1789784566486556977",
    "signature": "0x247304d3e9db7582df3acd29abbcb3db5de56fe6b6ae5cd2052297ec7750d8376e620c374b252970b6054de7777fc249bcbc03f439fd8b67e78e4b4b32f7c9161b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}