I sold that one in a trade for another domain + cash, but the combined value, although OK, was nowhere near the seven figures you could argue it's worth nowadays.
However, you must put things in perspective. Back in 2011/2012 the term "cryptocurrency" wasn't consensus even within the very small community of Bitcoin users. News sites used "cryptocurrency", "digital currency" and "virtual currency" interchangeably, and memory might be failing me but "cryptocurrency" didn't seem to be the front runner as the term that would eventually catch on.
In that same context, I hand registered cryptocurrency.org and let it expire the next year. The reason: it was a .org and I thought the .com was enough, considering the hundreds of other crypto .com's I had as well.
When you hear people talking about "crypto" nowadays, you might immediately make the Bitcoin / Blockchain connection. At that time, "crypto" was a short form for "cryptography", and some critics (with reason) said Bitcoin shouldn't be called a "cryptocurrency" any more than a secure website should be called a "crypto-site", because cryptography is just one (arguably small) part of the many technologies that glue Bitcoin together. Imagine yourself, as a domain investor, reading that from intelligent people and making an investment decision to put considerable amounts of money into "crypto" domains.
It was only in early 2017, after one of Bitcoin's many bubbles, that I sold the first crypto domain for six figures (CryptoBank.com), and have been able to sell a few other at that range since then.