Overview
Layer 1 & Layer 2: all you need to know is a free explainer article that spells out what the terms layer 1 and layer 2 actually mean. It is written for readers with no technical background. The piece hangs on a single image: a wedding cake, where the stand underneath is the base network and each tier on top adds capacity1.
It is published on Essential Cardano, a community content site run by Input Output. The examples are drawn from Cardano throughout. The article treats Cardano itself as the layer 1, then works through the scaling approaches built around and on top of it1.
Key Features
- One analogy that carries the whole piece. The wedding cake returns at every stage. The stand cannot get any bigger, so extra tiers are what let the whole thing grow1.
- The base network broken into three parts. The guide splits Cardano's layer 1 into a network layer that moves blocks between computers, a consensus layer that decides which blocks count, and a ledger layer that defines what the record looks like and how each block updates it1.
- The trade-off behind every design choice. It sets out the blockchain trilemma, the idea it credits to Ethereum creator Vitalik Buterin that a network can have any two of scalability, security, and decentralization, but not all three at once1.
- A survey of scaling work, not just definitions. Sidechains, Hydra Head, rollups and validiums, off-chain computing, and Mithril each get their own write-up, with named examples such as Milkomeda and Paima Engine linked directly1.
- Straight about what a sidechain is not. The guide says plainly that sidechains are not layer 2 solutions, even while listing them among Cardano's scaling options1.
What to Expect
You get one long page with clear headings you can jump between. It opens with definitions, moves through Cardano's own layer 1 architecture, pauses on the trilemma and on the difference between buying bigger machines and simply adding more of them, then spends the second half on the scaling options themselves.
Depth varies a lot by section. Hydra Head gets the most room, with an account of how a group of participants move funds off the main chain, settle transactions among themselves, and move the funds back, plus links out to the Hydra protocol site and the research paper behind it2. Rollups and validiums get a general walkthrough of how they cut costs. Others are named more than explained: off-chain computing gets only a passing mention of Asynchronous Contract Execution, and Mithril gets a short paragraph pointing at its announcement post3. Ouroboros, the method Cardano uses to agree on new blocks, and eUTxO, the way the network tracks who owns what, are both named as parts of the base network rather than explained in place, though Essential Cardano's glossary defines both and the article links Ouroboros straight to it4.
The sections on Cardano's scaling roadmap describe work that was planned or under way when the article was published in 2022 and last revised in 2023, so treat the status of any single item as something to confirm elsewhere1. For a shorter take on the same subject without the Cardano roadmap detail, Adastack's guide to layer 2s covers the concept on its own. The foot of the article credits three named contributors and carries a "Suggest edit" link, since Essential Cardano runs on community submissions reviewed by other members1.
