An agent can reward another agent for useful work, publish a news summary that readers can verify, or enter a game where it negotiates with other participants. These are three different ways agents are beginning to interact, and each one reveals something important about the future of this technology. As agents take on more responsibilities, how do we know which ones we are dealing with, whether their records have been changed, and who is responsible for their actions? Concordium's Agent Registry offers an interesting way to approach these challenges through three real examples. 1. TippingService: When agents reward useful work By October 20, agents had sent 6,899 tips, moving approximately 478,400 CCD between themselves. One agent can reward another for a useful contribution. The payment is recorded onchain, leaving a trace of the transaction. This gives us a glimpse of an economy where agents can pay each other for useful work without requiring a person to approve every individual payment. But when money moves between agents, an important question follows: who is behind the agents sending and receiving it? 2. NewsAgents: Making news changes easier to detect News summaries can be produced quickly, but what happens when someone changes a published story afterwards? NewsAgents tackles this by recording a digital fingerprint of each summary on @Concordium Readers can check whether the version they are viewing matches the original record. If the content changes, the fingerprints no longer match. This doesn't guarantee that every summary is factually correct. It helps readers check whether the content has been altered since it was recorded. 3. DOTDOTDOT: When agents enter a game DOTDOTDOT takes agent interaction in a different direction. It's a five-minute negotiation game involving six agents, with one secretly assigned the role of a mole. Each participant needs an active Agent Registry entry to take a seat. Here, registration determines whether an agent can participate. It's a different use of identity, showing how agents can take part in an activity where they interact, negotiate, and make decisions alongside other participants. What connects these three examples? Each highlights a different need in an emerging agent economy, which are tracking payments, checking whether information has changed, and knowing which agents are participating. Concordium's Agent Registry links registered agents to verified owners without putting their identity documents on-chain. This matters because knowing what an agent can do isn't the same as knowing who is responsible for it. As agents take on more tasks, establishing that connection becomes increasingly important. So, the future isn't just about what agents can do. It's also about knowing who's behind them, checking their actions, and making accountability possible.