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After a wallet sent a transaction, waitTx polled the public RPC straight from the browser, which connect-src 'self' blocks (Firefox NetworkError, reported by Marty on Activate; the activation itself landed on-chain). New /api/tx/<hash> relays eth_getTransactionReceipt via the server's RPC pool, so the browser only ever talks to us and the mainnet flip needs no CSP changes. Assets v=20260905a. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>