Passwords are a terrible way to prove you are who you say you are — they get stolen, forgotten, reused, and phished at industrial scale. Callsign was founded in London in 2012 with a more sophisticated thesis: that identity should be verified continuously through a combination of behavioural signals, device intelligence, and contextual data, rather than a single static credential. Its platform analyses how users interact with their devices — typing patterns, movement, location context — to build a dynamic identity signal that is far harder to spoof than a password or even a one-time code. For financial services, where the cost of fraud and the friction of security are both existential concerns, Callsign's approach offers a path to strong authentication that doesn't degrade the user experience. The company has worked with major banks and financial institutions, positioning itself in the growing market for intelligent authentication that sits between cybersecurity and identity verification. In a world where deepfakes and AI-generated fraud are making traditional authentication increasingly unreliable, the shift toward behavioural and continuous identity signals isn't a future trend — it's an urgent present need.