The Reputation Graph of Silicon Valley | Introducing Cosign

Episode Summary

Executive Summary: The episode announces Cosign, an A16Z product for capturing and surfacing professional reputation through public and private endorsements. The discussion argues that in Silicon Valley, who trusts and recommends you can matter more than credentials, and that AI will make human conviction and durable social proof even more valuable. The guests explore how Cosign can turn ephemeral signals into a living directory for people, companies, and opportunities.

Main Topics: Cosign as a reputation network (Priority: 5/5): The core product vision is a platform centered on professional reputation, where trusted people publicly and privately co-sign individuals and companies so strong signals are easier to find and use. Why endorsements beat resumes (Priority: 5/5): The conversation frames cosigns, mentor relationships, and high-conviction follows as more informative than conventional credentials, especially in startup hiring, investing, and talent discovery. Private vs. public signals (Priority: 5/5): The product is designed to capture both private intent (people you'd fund, hire, or work with) and public announcements or endorsements, creating a more granular network than standard social platforms. LinkedIn, X, and AngelList as predecessors (Priority: 4/5): The speakers compare Cosign to existing platforms, arguing that LinkedIn is too flat, X is too ephemeral, and AngelList once served part of this need for startups but no longer fully does. AI increases the value of human conviction (Priority: 4/5): As AI makes outreach, content, and applications abundant, the scarce resource becomes credible human judgment about people and companies; Cosign is positioned to preserve and surface that. Celebrating builders beyond founders (Priority: 4/5): The product aims to recognize the many engineers, designers, operators, and other contributors who shape companies but are often invisible in public discourse. Network effects through timing and matching (Priority: 4/5): A recurring theme is that many introductions fail because timing is off; Cosign tries to persist intent over time so people can connect when needs and skills align.

Key Arguments: The most valuable skill in the industry is identifying people and companies before the market does. A trusted endorsement can convey more than a resume or school name because it reflects actual belief from respected peers. Silicon Valley operates on reputation transfer: if someone trusted co-signs you, others will take a meeting, hire you, or invest in you. Current platforms do not capture enough relational granularity; a single 'connection' hides major differences in trust and context. Cosign can make reputation durable by preserving ephemeral praise, introductions, and public announcements in one place. Public cosigns benefit both receiver and giver: receivers gain access, while givers build a reputation for spotting talent early. AI will flood the market with more messages, applications, and outreach, making human conviction and verified signal more valuable. A positive-only product philosophy was chosen so the system rewards celebration, recognition, and useful signal rather than critique. The product can help not just founders and investors, but also candidates, operators, and teams looking for specific expertise or collaborators. Long-term thinking matters: co-signing early can pay off later when the person remembers who believed in them first.

Data Points: Newsletter duration: 6.5 to 7 years - Olivia said she and Justine ran a Sunday newsletter aggregating startup job postings for roughly six and a half or seven years. Event attendee list: 150 people - Josh described an SV Angel event where attendees received a list of 150 people to swipe on for introductions. Company suggestions in one post: 2,000 results - Olivia said a LinkedIn post asking candidates to fill out a form produced about 2,000 responses. Potential future response volume: 10,000 to 100,000 - She projected that as AI/browser agents improve, the same kind of opportunity post could yield 10,000 to 100,000 responses. Packy McCormick companies list: 37 companies - The transcript mentions Packy McCormick having selected 37 companies on the site. Time horizon of network effects: 20 years - The discussion referenced LinkedIn as an example of a network effect strong enough to endure for decades. LinkedIn acquisition value: $26 billion - LinkedIn's acquisition price was referenced as evidence of its iconic product status.

Pivotal Quotes: "be so good that people do business through you" — David Booth: Used to describe how reputation and cosigns can let people create value for others without direct coordination. "there are so many people in the world who we want to meet who also want to meet us. And it's just an information problem" — Josh Ellman / discussion: Explains the core matching problem Cosign is meant to solve by reducing friction and preserving intent. "the most important skill in this town, or in this industry, or perhaps in the world, is your ability to identify things before the market" — David Booth: Summarizes the thesis that early conviction about people, products, and companies is the key professional advantage.

Implications: Cosign could make professional reputation more measurable, persistent, and actionable. If it works, hiring, fundraising, introductions, and talent discovery may become faster and more trust-based, especially in tech.