Mastercard expands Crypto Credential to self‑custody wallets using Polygon to enable verified, username‑style aliases. Mastercard, Polygon Labs, and Mercuryo announced on November 18, 2025 that Mastercard Crypto Credential will extend to self‑custody wallets, with Polygon chosen as the initial blockchain network and Mercuryo as the first issuer to onboard verified users and create alias‑based credentials. […]