They I believe, reffer here, to "similiar currencies"
can you please explain what is to become a precursor of something?
Before the group of people or the person known by the pseudonym: "Satoshi Nakamoto" created Bitcoin, several similar currencies were created. They became its precursors. In 1990, David Chaum created Digicash. What's more, by definition, the currency was to become its own bank and control its funds without supervision from third parties.
The similar currencies that were created before Bitcoin became Bitcoin's precursor because they occurred before Bitcoin and were similar to it.
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The similar currencies that were created before Bitcoin became Bitcoin's precursor because they occurred before Bitcoin and were similar to it.