Where does “cocksure” come from?

I need to analyze this etymology chain, but I notice it appears to be corrupted or circular—it shows "English cocking | English ten" repeating multiple times without clear progression to older languages or a coherent etymological path. Given the rules require me to "state only what the chain supports" and "do not invent dates, cognates, or intermediate steps," I cannot construct an accurate sentence from this data. A proper etymology would show a clear progression through different languages (e.g., English → Old English → Proto-Germanic, etc.), but this chain doesn't provide that. **I cannot write the sentence because the provided chain does not support a valid etymological statement.** If you have the correct etymological chain for "cocksure," I'd be happy to write the summary sentence following all the rules.

cocksure (English): too confident; overconfident