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Afaik the lightning network currently supports the 15th decimal place...

Cute, but unless BTC is worth $10 million what does that realistically achieve? Where are you going to spend $0.0000000002?

Apps in Lightning for streaming data, and paying by the minute/3 minutes/5 minutes?

I found a great answer to the question why Ethereum uses 18 decimal places:

Quote

Allowing for 18 decimal places was the only way to move forward. This will allow ethereum to one day achieve it's true market cap and be utilized within our known universe by all species capable of building a computer and communicating through the inter-web to participate in universal-commerce without fear of being scammed.

In all seriousness though, I don't see much point in that many decimals. As far as I know LN "only" uses 11 decimal places (up to millisatoshi), which is already smaller than anything I'll ever care about no matter how mainstream Bitcoin will become.
I sure hope "Pay by the minute" won't reach the point where I have to make a transaction every few minutes, but I also doubt it would be that low if it is going to happen. Why would anyone want to make millions of billing transactions just to earn a fraction of a cent, while uploading videos on Youtube can earn you up to several cents per view already.

Afaik the lightning network uses 12dp (so a decimilli Satoshi or a pico bitcoin).

I thought it was a number followed by the exponent so 1m (by example) would be 0.001 BTC...

But if you made a channel on YouTube and were being paid in bitcoin, surely you'd just have a channel directly open with them and not have to have your transactions on the chain...