Your phone and the website save the same secret key when you scan the set-up QR code. Both count time in 30-second blocks and mix the key with the current block number using a one-way scramble, then keep six digits, so both get the same code. Source: IETF RFC 6238 (TOTP) and RFC 4226 (HOTP).
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EliseAI's software already runs one in six U.S. apartments. Its new $350M round at a $4B valuation, led by a16z and Bessemer, is a bet that the biggest AI money hides in the admin work of housing and healthcare.
Commonwealth Fusion raised another $1 billion — total now $4 billion — and this time pension and sovereign funds led the round. Here's why the boring money matters more than the number.
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