https://www.by4si.com/ 2026-07-20 https://www.by4si.com/assets/editorial/4si-key-verification.webp 4SI physical verification for human authorization A Presence Key being presented for physical verification. https://www.by4si.com/presence 2026-07-19 https://www.by4si.com/assets/product-studies/key-system.jpg Presence Key physical trust system Presence Key and its controlled verification system. https://www.by4si.com/applications 2026-07-19 https://www.by4si.com/assets/editorial/product-authenticity.webp Physical product authenticity verification Physical verification supporting product authenticity and chain of custody. https://www.by4si.com/intelligence2026-07-20 https://www.by4si.com/intelligence/presence-risk-index2026-07-20 https://www.by4si.com/intelligence/exposure-radar2026-07-20 https://www.by4si.com/intelligence/exposures/physical-objects-outpace-digital-conformity2026-07-20 https://www.by4si.com/intelligence/exposures/workforce-identity-detaches-from-accountable-presence2026-07-20 https://www.by4si.com/intelligence/exposures/similarity-is-losing-value-as-transaction-authority2026-07-20 https://www.by4si.com/intelligence/exposures/agentic-execution-outgrows-continuous-human-authority2026-07-20 https://www.by4si.com/intelligence/exposures/support-procedures-become-privileged-access-boundaries2026-07-20 https://www.by4si.com/intelligence/incidents2026-07-20 https://www.by4si.com/intelligence/reports2026-07-20 https://www.by4si.com/intelligence/reports/presence-12-month-review2026-07-20 https://www.by4si.com/intelligence/methodology2026-07-20 https://www.by4si.com/company 2026-07-19 https://www.by4si.com/assets/founder/niclas-braun-study.jpg Niclas Braun, founder of 4SI https://www.by4si.com/company/niclas-braun 2026-07-20 https://www.by4si.com/assets/founder/niclas-braun-study.jpg Niclas Braun, founder and CEO of 4SI Niclas Braun, technology entrepreneur and founder and CEO of 4SI. https://www.by4si.com/papers2026-07-19 https://www.by4si.com/verification-control-primitive2026-07-19 https://www.by4si.com/economic-research 2026-07-19 https://www.by4si.com/assets/editorial/natural-delta-signature.webp The economics of verifiable reality A branching natural system illustrating physical origin and distributed pathways. https://www.by4si.com/approach2026-07-19 https://www.by4si.com/faq2026-07-19 https://www.by4si.com/glossary2026-07-19 https://www.by4si.com/careers2026-07-19 https://www.by4si.com/contact2026-07-19 https://www.by4si.com/access2026-07-19 https://www.by4si.com/responsible-disclosure2026-07-19 https://www.by4si.com/legal2026-07-20 https://www.by4si.com/legal/legal-notice2026-07-20 https://www.by4si.com/legal/privacy-research2026-07-20 https://www.by4si.com/legal/privacy-eu-eea2026-07-20 https://www.by4si.com/legal/privacy-us2026-07-20 https://www.by4si.com/legal/california-privacy2026-07-20 https://www.by4si.com/legal/presence-risk-index-disclaimer2026-07-20 https://www.by4si.com/legal/exposure-radar-disclaimer2026-07-20 https://www.by4si.com/legal/editorial-source-policy2026-07-20 https://www.by4si.com/legal/corrections-policy2026-07-20 https://www.by4si.com/legal/copyright-takedown2026-07-20 https://www.by4si.com/legal/ai-editorial-transparency2026-07-20 https://www.by4si.com/legal/accessibility2026-07-20 https://www.by4si.com/legal/legal-privacy-contact2026-07-20 https://www.by4si.com/privacy2026-07-19 https://www.by4si.com/cookies2026-07-19 https://www.by4si.com/terms2026-07-19