» Have there been any mistakes in signature verification for this letter?

» We are aware of two mistakes in our efforts to verify the signatures in the form so far. One person who was not an employee of OpenAI or Google found a bug in our verification system and signed falsely under the name "You guys are letting China Win". This was noticed and fixed in under 10 minutes, and the verification system was improved to prevent mistakes like this from happening again. We also had two people submit twice in a way that our automatic de-duplication didn't catch. We do periodic checks for this. Because of anonymity considerations, all signatures are manually reviewed by one fallible human. We do our best to make sure we catch and correct any mistakes, but we are not perfect and will probably make mistakes. We will log those mistakes here as we find them.