Coinbase’s blockchain got faster. Some apps can still connect but get no data

Coinbase’s Base blockchain retired its Flashblocks data feeds in the Nov. 5 Denim upgrade, requiring apps using them to migrate. The old WebSocket endpoints still accept connections but no longer deliver data, according to Base’s migration instructions.Denim activated on mainnet at 18:00 UTC on Nov. 5. Base’s upgrade overview describes complete canonical blocks every 200 milliseconds, each with its own hash, state root and receipts. These are the chain’s blocks rather than previews of a block still being built.The compatibility trap is that an open connection no longer establishes that an app is receiving updates. Reconnecting to a retired Flashblocks endpoint leaves the underlying integration problem unresolved.Retired connection versus canonical data routeA retired Flashblocks endpoint accepts an app connection but carries no data. The replacement route uses canonical 200ms blocks through an RPC provider or own node. RETIRED PATH Flashblocksendpoint Connection acceptedNo streamed data YOURAPP REPLACEMENT PATH Canonical blocksEvery 200ms RPC provideror your own node newHeads / logs pending now resolves to the latest canonical block. Use a new data route after DenimOld endpoint rem...