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- wallet_addEthereumChain omits blockExplorerUrls when the config explorer is empty (rehearsal has none) — an empty-string URL made Trust Wallet reject the add with "invalid method parameters", blocking new users from adding the chain. - personal_sign now hex-encodes the SIWE message (Trust Wallet requires hex; MetaMask took raw). Signed bytes are identical so server recovery is unchanged. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>