The Reputation Graph of Silicon Valley | Introducing Cosign

a16z launches Cosign, betting that durable, granular human endorsements will become more valuable as AI floods networks with cheap outreach.

• Launching Cosign: a16z introduces Cosign, a directory/product built around professional reputation — mentors, colleagues, and "people to watch" — for the startup community, launched free.
• Three core endorsements: Every profile targets at least three signals — who shaped your career, who you'd work with anywhere, and a person to watch — ranked and built over years like an investor track record.

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