This guide shows how onchain agents can structure and sign data using Base Mainnet core contracts—one for registering schemas and one for making attestations. By the end, you’ll see how to create a straightforward subscription service that tracks “who’s subscribed” to an agent.1. IntroductionMany agents today are just glorified reply bots. But as we push agents into real onchain work—executing transactions, verifying data, collaborating in swarms, powering InfoFi, or scaling agent commerce—th...