Given that your goal is to make toys, the tradeoffs of cryptocurrencies are unacceptable. The whole architecture of cryptocurrencies is based around extreme security and trust. Who needs that level of security for a toy? Why would I tolerate high fees, slow transactions, and a clunky user experience if the token isn't worth anything? Why would I use a globally-distributed power-guzzling network of thousands of GPUs to make something as silly as TallCoin? This has all the downside of cryptocurrencies with none of the upside.
Databases aren't trendy, but they'd solve the same problem better with less waste.
Databases aren't trendy, but they'd solve the same problem better with less waste.