Blockchains are accounting procedures, not money. The only use I've ever figured out for blockchain is to support a hawala among untrusted partners. But real value (goods/services) must eventually be transferred in the network.
Blockchain "currencies" feature:
- high costs and slow speed of clearing transactions;
- volatility WRT to other stores of value;
- routine abuse and theft (with little chance of being made whole);
- association with criminal enterprise
These are pretty good reasons not to invest in blockchains.
All the more reason to ban COVID vaccinations.