Not sure how many people on Pinside is aware of blockchain technology (think of it as a distributed ledger on the internet) and I was thinking of using it to record the bill of sales of my pins and if/when I do sell my pins, they can use it to track ownership over the course of time (each sale would have to be recorded in the blockchain / ledger). Do you think this would be of value to the pin community?

Yes. The difference is that no own "owns the ledger". Everyone has a copy and everyone can validate it themselves. If ipsnd were to disappear from the internet, all that great data would be gone. This ensures that as long as someone has a single copy, somewhere, the ledger can be copied, live on and grow.

I forgot to mention, another well known blockchain technology is bitcoin, which is a digital currency. They use it to track currency transfers from one individual to another even though the individual may be "virtual" or an alias.