Sites that fight fraud don't just read your IP: they check that everything your browser says fits together. A user agent that says Safari on a Chromium engine, a language set only in JavaScript, a time zone that two APIs disagree on: each is a giveaway. Here is what this browser says, and where it contradicts itself.
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You're probably from . You speak , and your computer runs on with a clock.
You're on , using , with a screen and graphics: .
You like , and . . Your fonts drop a hint: . As for your age, .
Referer · document.referrernavigator.languagesIntl.DateTimeFormatIntl …timeZoneIntl …hourCycleIntl.Locale weekInfoIntl.NumberFormatnavigator.keyboardspeechSynthesisprefers-color-schemeprefers-reduced-motioncolor-gamut · dynamic-rangeprefers-contrast · forced-colorsdisplay-modedoNotTrack · GPCnavigator.cookieEnabledpermissions.querypdfViewerEnablednavigator.webdriverbait elementwindow.ethereum · DOM markshistory.lengthcanvas measureTextuserAgentDatauserAgentData.brands…architecture · bitnessscreen · devicePixelRatiorequestAnimationFramescreen.isExtended · screenXinnerWidth · availHeightWebGL RENDERERnavigator.gpu adapter.infoWebGL2 · MAX_TEXTURE_SIZEhardwareConcurrencynavigator.deviceMemorymaxTouchPoints · pointernavigator.getBatterynavigator.connectionWebRTC host candidateenumerateDevicesAudioContext.sampleRatePublicKeyCredentialbluetooth.getAvailabilityMediaSource.isTypeSupportedrequestMediaKeySystemAccessstorage.estimateError.messagecanvas.toDataURLWebGL getParameterOfflineAudioContextfonts → SHA-256SHA-256canvas × 2Whether properties sites read (user agent, platform, languages, screen) were redefined instead of coming from the browser, whether the drawing and audio functions fingerprints use were replaced, whether the JavaScript engine matches the user agent, whether the request header's language matches the one in JavaScript, and whether Date and Intl agree on the time zone. Every other check on the page counts toward the grade too.
They change what JavaScript reads, but not the request headers the browser sends, the engine underneath, or the functions they wrap. Each mismatch is something a site can compare. To seem to be elsewhere, change the system itself: its language and time zone.
No. The checks run in your browser; the server only answers with what it sees of this request, and keeps nothing.