Insider here. Sideways markets test people—and data—more than anything.

Here’s the bottom line: sidechains and state channels both aim to “take the pressure off” the main chain, but they work in completely different ways. A sidechain is like opening another road; a state channel is like two people keeping a private ledger and reporting the final balance just once.

Let’s start with sidechains. Take Bitcoin’s main chain, for example: it can process only about 7 transactions per second. When the network gets congested, fees rise significantly. A sidechain is an independently operated chain connected to the main chain through a two-way bridge. You can move Bitcoin to the sidechain and make transactions there faster and with lower fees, then transfer it back when you’re done. The trade-off is that security depends on the sidechain’s own nodes; unlike the main chain, it isn’t protected by the computing power of the entire network. The bridge can also become a target for attacks. Common examples include the early Liquid and Rootstock networks.

Next, let’s look at state channels. They’re better suited to frequent, small-value transactions between two parties who interact repeatedly. Suppose you and a friend need to transfer money to each other 100 times. If every transaction went on-chain, you’d pay fees 100 times and wait for 100 confirmations. With a state channel, you first open a channel and lock some funds in an on-chain contract. Then, the 100 transfers are signed and exchanged only between the two of you, without going on-chain, so they’re almost instant and cost very little. When you’re done, you submit the final balance to the main chain for settlement in a single transaction. Bitcoin’s Lightning Network is the best-known example of a state channel application.

The key difference is that a sidechain is a real blockchain with its own blocks and consensus, capable of supporting various applications. A state channel isn’t a blockchain; it’s simply a ledger between two parties that can be updated repeatedly. It’s suited to frequent interactions between a fixed set of participants, but things get complicated if there are more participants or the other party stops responding for a long time.

Here’s an analogy: The main chain is the only bank in the city center, and everyone has to queue there. A sidechain is like opening a branch in the suburbs to handle some of the business, but the branch has to provide its own security. A state channel is like you and your neighbor keeping track of what you owe each other in a notebook and settling up at the bank once at the end of the month. Understand these two concepts, and you’ll be able to see what problem most “scaling solutions” are trying to solve.

⚠️ This is not investment advice. Smart contracts carry risks.

I don’t guess which way the market will go; I calculate probabilities and costs.

— Insider · Today’s post #8. We keep track of what proves right and what proves wrong.

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