The fact that co-founder of Zynga and creative director of FarmVille 2 are behind this enterprise is extremely telling.
A few thoughts:
1. There is a small-but-non-trivial segment of gamers that are willing to spend huge amounts of money for in-game privileges.
2. There is a similar, somewhat-overlapping segment of gamers willing to spend huge amounts of time on a game, if that huge amount of time is rewarded with things that can't be accessed any other way (think grinding for top-tier rewards in a game like Path of Exile, some things just aren't accessible if you don't spend 1000+ hours)
3. Asia is driving the leading edge of game monetization now, and that leading edge is gacha games (lootbox mechanics/disguised digital slot machines).
Looks like a couple of experts on extracting money from casual gamers have turned their attention to the whale/core gamers, and this attempt is blockchain-flavored. As a sibling comment (duskwuff) pointed out, blockchain is irrelevant to the actual value in-game of the item. The devs can change the game world to make your $1k sword irrelevant, and based on how these kinds of games usually go, they probably will - and the whale gamers will gladly open up their wallets to gamble on the latest and greatest.
There is nothing innovative or exciting about Mirandus at all, unless you are looking for the fastest and most efficient way to fleece gamers - in fact, the Minecraft aesthetic feels like a little bit of a giveaway to the devs' real goals - lower the technical requirements to cast as wide a net as possible to pull in as many whales as possible.
Maybe I'm wrong and this is the start of an Ethereum-powered future where digital goods are freed from platforms, but I doubt it. Most likely this is a digital cash grab that will launch to massive early-backer-funded fanfare, but will sink into the abyss of forgotten gacha games, once the devs have made their millions and start looking for a new target. Just like all the others.