Rails Before Trains, Part 1: Bitcoin's Borrowed Brain
By apltang ·
Part one of a four-part series on RGB++ and Fiber Network, the two technologies Nervos Network is betting on to make Bitcoin assets programmable and instantly payable.
Disclosure: one of this series' authors builds Cellula at LusoCryptoLabs, the studio discussed in Parts 3 and 4, which has an active Community Fund DAO proposal that this series references. The authors hold CKB. This series presents information, not recommendations, and nothing in it is investment advice. Bitcoin is the most trusted ledger in the world and one of the least capable. That is not an insult. It is a design decision. Bitcoin's scripting language was deliberately kept small so that it would be hard to break, and fifteen years of not breaking is exactly why people trust it with more than a trillion dollars. But the same decision means that if you put a token on Bitcoin, you cannot make that token do much. You cannot lend it against collateral. You cannot trade it in an automated pool. You cannot build a stablecoin vault around it. You can hold it, and you can send it. Every attempt to fix that has run into the same wall. To give a Bitcoin asset real abilities, you have to move it somewhere that has them. And moving it almost always means a bridge: a vault on one side, a stand-in token on the other, and a group of people in the middle you have to trust not to lose the vault. This series is about a different answer, built by Nervos Network on its Layer 1 blockchain, CKB (Common Knowledge Base). It comes in two parts. RGB++ is a way to give Bitcoin assets smart-contract abilities without moving them through a bridge. Fiber Network is a payment network, modeled on Bitcoin's Lightning Network, that is supposed to let those assets move instantly and almost for free. This first part explains how RGB++ works. Later parts look at what happened after it launched, what Fiber adds, and whether any of it is being used. Fair warning: the engineering is elegant, and the usage numbers are sobering. Both are true at once, and that tension runs through the whole series. First, how Bitcoin keeps track of money To understand RGB++ you need one idea about Bitcoin, and it is…