Foundation matters, Bitcoin has it most-solid, it created the idea, without Bitcoin, no cryptocurrency.
If you're talking about foundation, be let known that there had been lot of digital currencies intended to build using the cryptograph but failed to achieve valuable potentials that'd attract massive adoptions which majorly the DigiCash was a closed approach to get it dream achievable but due to it correspondence of the central authority to validate it transactions, it was seem not what it proposed of executing transactions anonymously with decentralized motive untill it was crashed as a case of poor adoption. Meanwhile there had also been some other tried but failed that were all digital currencies on cryptographical inputs such as the Bit Gold, Hash Cash and B-money that were still invented but has no good rate about.
Then Satoshi Nakamoto came with the ability to had figured the lapses of why all the intended digital currencies ought to be decentralized currency failed to exist and stayed and then he invented bitcoin fixing those loopholes and on gradual process bitcoin was able to acquire those concepts of digital currency with the procession of anonymous transactions and the potential hedge to store values which has come a most trending digital investment today and had also become a most dominance in the crypto industry.
The ATH of 2021 [$4,870] is still holding in 2025. 