If Bitcoin is going to be the world’s currency, a stock split style adding of place values past hundred millionth will need to be added to the main chain.

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Because self custody is the revolution.

we already have sats. the 21m cap is one of the main reasons bitcoin is bitcoin.

Adding place values won’t change the number of bitcoin. The hard cap would remain 21M.

Sats will be a serviceable smallest denomination of BTC for the foreseeable future.

More likely, those smaller values will be settled off chain. Lightning already supports millisatoshis.

Currently the cheapest on chain transaction costs hundreds of sats. This will increase significantly on a world Bitcoin standard. So there isn't much need for another decimal on chain. Nobody is going to pay 150 sats to settle a 0.5sat transaction.