Sulla Bitcoin wiki è riportato: "The value of a bitcoin in satoshi was decided by Satoshi Nakamoto to be 100 million no later than November 2008[2]. On November 15, 2010, Ribuck proposed that the one hundredth of a bitcoin (0.01 BTC) be called a Satoshi. Four months later he instead suggested that the one hundred millionth unit be called an austrian or a satoshi. The name satoshi caught on, and was widely adopted thereafter. "

Personalmente non ho conferme sull'attendibilità di quanto riportato, ma non vedo motivi per cui non dovrebbero riportare il vero.

Qui il link: https://en.bitcoinwiki.org/wiki/Satoshi

Sezione History.