Ethereum: How to convert channel id from c-lightning to lnd?

I would be happy to help you convert channel IDs from C-Lightning to LND. Here is a step-by-step guide on how to do it:

Supporting Channel IDs

In both C-Lightning and LND, channel IDs are used to identify and manage payment channels between users. The format of the ID is usually as follows:

Channel ID (height, block number, slot number, transaction hash)

For example, a common C-Lightning channel ID might be 505580x1917x1.

Converting C-Lightning to LND

To convert a C-Lightning channel ID to an LND-compatible format, you will need to perform the following steps:

Ethereum: How to convert channel id from c-lightning to lnd?

Step 1: Parse the C-Lightning channel ID

First, parse the C-Lightning channel ID string into its components:

height (x): 505580

block number (x): 1917

slot number (x): 1

transaction hash (x): ?

Note that in LND, we will focus on the height, block number, and slot fields.

Step 2: Convert to LND-compatible format

To convert the parsed values ​​​to an LND-compatible format, use the following formula:

channel_id = (height 60) + (block_number 10^15) + slot

Here is a breakdown of the formula:

(height 60) calculates the total number of units in the channel by multiplying the height field by 60.

(block_number 10^15) converts the block number to an LND-compatible format, where each block has 10^15 units. This is done by shifting the block number 15 bits to the left (i.e. dividing it by 1000000) and then multiplying by 10^15.

Step 3: Calculate the Channel ID

Now that we have the parsed values ​​​and the conversion formula, let’s calculate the LND-compatible channel ID:

channel_id = (505580 60) + (1917 10^15) + slot

Calculate the channel ID using the formula above.

Step 4: Add a unique identifier

To make the channel ID more readable and useful, add a unique identifier to each channel. This can be done by appending a suffix to the channel ID:

channel_id = "LND Channel ID: "

For example, if our channel ID is 505580x1917x1, we would append x to get 505580x1917x2.

Example Use Case

Suppose you have a C-Lightning channel with the following values:

height (x): 506000

block number (x): 1928

slot number (x): 2

transaction hash (x): ?

Using the above formula, we can calculate the LND-compatible channel ID as follows:

channel_id = (506000 60) + (1928 10^15) + 2

The result would be 31168000 for our example channel.

By following these steps, you should have an LND-compatible channel ID for your C-Lightning channels.

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