Is Cube Really Bitcoin's Holy Grail?

Burak Keceli describes his new project, Cube, as the Holy Grail of Bitcoin.

The reason for such a bold claim is easy to see. Bitcoin enthusiasts have been searching for what many have come to view as an impossible combination: real BTC + fully featured smart contracts + no trust in a bridge, federation, or operator + the ability to withdraw your assets back to your own address without anyone's permission.

According to Cube's creator, Bitcoin's limitations are intentional. They are what make it resilient in hostile environments and allow users to hold their own funds securely. But those same limitations prevent Bitcoin from natively supporting DeFi, complex smart contracts, and high-frequency financial applications. Cube's answer is not to change Bitcoin itself, but to build a Layer 2 on top of it - one that adds programmability without modifying the protocol or handing control of coins to intermediaries.

But wait a minute. Doesn't the RGB protocol already aim to do essentially the same thing?

It does.

And is there significant demand for it? Is there strong public interest?

Not really.

So who exactly needs this Holy Grail?

Personally, I can think of several Bitcoin challenges that would have a much stronger claim to that title:

• the increasingly high barrier to entry for mining;
• the ever-growing blockchain that anyone seeking true self-reliance must store locally in full, regardless of what third parties choose to put into it - even if some of that data may be considered illegal in certain jurisdictions;
• the abuse of Bitcoin's transparency to justify coin blacklisting and restrictions on perfectly legitimate users.

Solve any of those problems, and that would look like a Holy Grail.

As for programmability, anyone who wants it can simply visit rabbit.io and swap Bitcoin for Ethereum - or for any other cryptocurrency designed specifically with programmability in mind.