Circle Internet Financial has introduced a new metric called Transaction Proximity in a research paper, which assesses wallet risk by measuring the number of onchain "hops" separating a wallet from centralized exchanges. This metric categorizes wallets within one hop as Easily Attainable Identities (EAIs), allowing smart contracts to dynamically determine access rights and other actions based on proximity to exchanges. The significance of this metric is demonstrated through its coverage of most real activity, capturing money flows without requiring blanket KYC, and deterring fraud by identifying exploiter wallets that are not EAIs. The paper also discusses various methods for surfacing EAI data, such as onchain registries and Merkle-proof lists, balancing factors like gas cost and transparency.