What are the wallet address versions?
As the blockchain evolves and grows, new wallet address versions are developed in order to keep up with the latest technologies. As a result, three wallet address versions are available in Tonkeeper settings (click the Active address button) — v3R1, v3R2, and v4R2. Thus, some services may not support earlier (pre-v4R2) wallets. Older addresses can be used, however only the v4R2 version supports new and individual smart contracts as well as subscriptions to web3-services for Toncoin.