Add configurable node color

[benthecarman]

Feature request from anon

[ldk-reviews-bot]

I've assigned @tnull as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

[tnull]

Can you provide one example of where the color is actually used in 2026?

[tnull]

@benthecarman Any update on rationale for this, or can this be closed?

[benthecarman]

I mean, it's something people want to set. For actual usage I'm not sure.

[tnull]

I mean, it's something people want to set. For actual usage I'm not sure.

Are there even any explorers left that show the rgb field in any way? Actually curious what use cases there still are? Is it just (ab)used to encode some aux data?

[benthecarman]

It's showed on mempool

https://mempool.space/lightning/node/02f7467f4de732f3b3cffc8d5e007aecdf6e58878edb6e46a8e80164421c1b90aa

[tnull]

It's showed on mempool

https://mempool.space/lightning/node/02f7467f4de732f3b3cffc8d5e007aecdf6e58878edb6e46a8e80164421c1b90aa

Lol, I mean they mostly print the hex?

[randomlogin]

It is wrong on mempool.space, it doesn't really shown as a color on a graph.
Though 1ml does show the colors: https://1ml.com/visual/network

But it is a part of a node announcement, so it seems a user should be able to configure it.