Israeli startup Unibeam has secured $6 million in seed funding led by NFX, focusing on cryptographic authentication technology that utilizes SIM cards and eSIMs for identity verification. By generating unique cryptographic keys based on SIM ID, device ID, and phone number, Unibeam aims to replace traditional security methods like passwords and one-time codes, offering its solution as a SaaS product via API. This innovative approach transforms SIM cards from a security vulnerability into a trusted asset, addressing the industry's shift towards deterministic authentication methods amid rising threats like SIM swapping and phishing attacks.