Omnishield: one contract for guarding a form - is this token valid (ALTCHA, Turnstile, reCAPTCHA), is this content spam (Akismet), is this identity known for abuse (StopForumSpam, disposable e-mail domains) - and its Symfony bridge.
Omnishield reCAPTCHA: Google's captcha - v2 checkbox and invisible, v3 score with its threshold and action, and reCAPTCHA Enterprise assessments - its token checked by direct calls, no Google library.
Omnishield StopForumSpam: are this IP address, this e-mail (sent hashed), this name reported for abuse - the public database's frequency, confidence and last sighting, a threshold of the site's; reports with an API key.
Omnishield Akismet: is this content spam - comment-check (ham, spam, or flagrant spam to discard), submit-spam and submit-ham to teach it, verify-key; a key or transport error raised, never taken for ham.
Omnishield Turnstile: Cloudflare's captcha - the widget, and its token checked by Cloudflare's siteverify (the visitor's address, the action and the host checked back, a request retried under its idempotency key).
Omnishield Disposable: is this e-mail's domain a disposable one - the free disposable-email-domains list (CC0) shipped in the package, an allow list and a deny list of the site's, subdomains included; no call while a request runs, a command to refresh the list.
Omnishield ALTCHA: a proof of work the site issues and checks itself, on altcha-org/altcha - a challenge signed with the site's key, the solution the visitor's browser found checked, a solution refused the second time; no third party, no cookie.
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