LNChannelIDDecoder/index.html

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    <title>Lightning Network Channel ID Decoder</title>
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        <h1>Lightning Channel ID Decoder</h1>
        <p class="explanation">
            The Lightning Network (LN) uses short channel IDs as unique identifiers for payment channels. 
            This converter helps you transform a short channel ID into its corresponding components:
        </p>
        <ul class="explanation">
            <li><strong>Block:</strong> The block height where the funding transaction of the channel was confirmed.</li>
            <li><strong>Transaction:</strong> The transaction index within that block.</li>
            <li><strong>Output:</strong> The output index of the funding transaction.</li>
        </ul>
        <p class="explanation">
            For example, the short channel ID 
            <a href="https://mempool.space/lightning/channel/880174451395198976" target="_blank">880174451395198976</a> 
            is an identifier of a channel in LN gossip data. By using this converter, you can extract the block, transaction, and output information. This is what we see in various LN explorers.
        </p>
        <p class="explanation">
            The result will be displayed in the format: <strong>(Block x Transaction x Output)</strong>, for example: <strong>(800514 x 3017 x 0)</strong>.
        </p>
        <p class="explanation">
            For more details, refer to the <a href="https://github.com/lightning/bolts/blob/master/07-routing-gossip.md" target="_blank">Lightning Network documentation</a>.
        </p>
        <label for="channelId">Enter Channel ID (Decimal):</label>
        <input type="text" id="channelId" placeholder="e.g., 880174451395198976">
        <button onclick="convertChannelId()">Convert</button>

        <div class="result" id="result" style="display:none;"></div>
    </div>

    <script>
        function extractBlockTxOutput(idValue) {
            const block = idValue >> 40n; // Extract block using BigInt
            const tx = (idValue >> 16n) & 0xFFFFFFn; // Extract transaction using BigInt
            const output = idValue & 0xFFFFn; // Extract output using BigInt
            console.log(`ID Value: ${idValue}, Block: ${block}, Transaction: ${tx}, Output: ${output}`); // Debugging log
            return { block, tx, output };
        }

        function convertChannelId() {
            const input = document.getElementById('channelId').value.trim();
            const idValue = BigInt(input); // Convert string to BigInt

            // Check if the input is a valid number
            if (!/^\d+$/.test(input)) {
                alert("Please enter a valid decimal channel ID.");
                return;
            }

            const { block, tx, output } = extractBlockTxOutput(idValue);
            const resultDiv = document.getElementById('result');
            resultDiv.style.display = 'block';
            resultDiv.innerHTML = `
                <strong>Results:</strong><br>
                Block: ${block}<br>
                Transaction: ${tx}<br>
                Output: ${output}<br>
                Block-TX-Output: (${block} x ${tx} x ${output})
            `;
        }
    </script>
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