I heard of this but never really took it seriously. I mean, of course, I know Paypal, and I am also familiar with DigiCash being invented way earlier than Bitcoin, but I never considered the latter a cryptocurrency as such. The op's question is not just about the first electronic money, right? It's about the first crypto. Digicash offered anonymity and used cryptography, but I cannot find the information about the mechanism of determining the value and supply of it. I suppose it was nothing like Bitcoin in this sense, and neither was it available for mining, right? So I guess the answer to the question about the first cryptocurrency depends on which characteristics we find essential for a crypto. Like some disagree that Libra is a crypto, because it will be centralized and regulated.