The team behind Privacy Pools, 0xbow, has introduced a new tool called "Proof of Association" to help Tornado Cash users distinguish their funds from illicit ones. This tool allows users to generate a zero-knowledge proof by providing annotations and withdrawal addresses, verifying that their funds are not linked to over 16,000 blacklisted addresses. Upon successful verification, users' addresses are added to a public "legitimate association" registry, ensuring privacy while meeting compliance requirements.