Vertical scaling in crypto is basically about beefing up or powering up one blockchain itself to be able to handle more activity. It’s also called “scaling up,” and it’s one of the easiest ways to speed up a network. It’s kind of like taking your old laptop and upgrading the processor, adding more RAM, and putting in a bigger hard drive so it runs smoother, instead of buying a whole new computer.
This means the network will upgrade the base layer (the main chain) by expanding what the nodes/validators can do. Blockchains face a common problem, which is identified as the scalability trilemma. You want speed (high transactions per second), security, and decentralization all at once, but it’s tough. When a network decides to scale vertically, they basically increase the power of individual nodes instead of changing the way the entire network is structured.
One common way of scaling is by raising hardware requirements for validators. To process more transactions in less time, nodes would require a more powerful CPU, more RAM, or a better internet connection. More powerful CPUs would allow nodes to validate complex smart contracts and signatures faster. More RAM can help the system handle more data, at the same time, without slowing down. With better bandwidth, nodes can communicate with each other faster, thus reducing the time it takes a transaction to propagate through the network.
But vertical scaling is a two-edged sword in the crypto world. Even though it is technically easier to implement than “horizontal scaling” (like sharding, which involves splitting the blockchain into many pieces), it comes with its own set of challenges. One of the biggest concerns is that of centralization. If a blockchain requires extremely expensive, high-end servers to run a node, regular people can no longer participate from home. This can lead to a few wealthy entities controlling the network, making it “centralized.”
Your completely free resource hub designed to boost your knowledge of cryptocurrencies
Then there are the physical limits. You can only make a single computer so powerful. Eventually, you reach a point where even the most advanced hardware on the planet cannot meet global demand. Another flavor you hear a lot with Ethereum is using Layer 2 solutions like rollups (Optimistic or ZK rollups).
Solana is a well-known example of a blockchain that leans into vertical scaling. It is designed to take full advantage of high-end hardware and fast internet speeds to process thousands of transactions per second.