tzbeta.net resolves but intermittently socket-hang-ups on contract-context queries under load, failing the mint flow's sequential RPC calls. Switch mainnet to https://rpc.tzkt.io/mainnet (5/5 reliable in probe, same provider as the api.tzkt.io this code already depends on). Ghostnet stays on teztnets. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>