Someone tried to mine on it, nevermind run a wallet on it.
A program developed by Maciej Witkowiak(YTM) called
C64 Bitcoin Miner helps the C64 process transaction hashes.
The hashing rate achieved was 0.3 h/s, the code of the program is written in C programming language, not machine language which could possibly provide 10 times more performance. Even when using the SuperCPU which increases the performance further by 20x it is will a very slow speed at 0.1s per hash. Using the Turbo Chameleon 64 it gets 0.1-0.2s per hash.