DApps: Apps That Run on a Blockchain Instead of a Company's Server
What actually makes an application 'decentralised', and why that label covers a much wider range of genuine decentralisation than the marketing suggests.
By Firoz Khan|29 August 2026|Updated 20 September 2026|7 min read
A DApp, a decentralised application, runs its core logic on a blockchain via smart contracts rather than on a company-owned server. In theory that means no single company can unilaterally shut it down, change its rules, or seize user funds. In practice, how decentralised a given DApp actually is varies enormously behind an identical label.
What actually runs on-chain versus off
A DApp's smart contracts, the logic handling funds and core rules, typically run on-chain, verifiable and generally unstoppable by any single party once deployed. The user-facing website or app you interact with, however, is very often hosted conventionally, on normal servers a company controls, which means that front end can be taken down even while the underlying contract keeps working.
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Why that distinction matters in practice
If a DApp's website disappears, whether from a legal order, a hack, or the team simply stopping maintenance, the underlying smart contract usually still exists and can often still be interacted with directly, just without the convenient interface most users rely on. This has happened to real, well-known DApps and is a genuine, not hypothetical, risk to understand.
Common categories worth knowing
Decentralised exchanges let users trade directly from their own wallets without a central custodian holding funds. Lending protocols let users borrow and lend without a bank. Decentralised social and gaming apps aim to give users more ownership over their data or in-game assets than a conventional platform typically allows.
What to check before trusting one with real funds
Whether the smart contract has been independently audited, how much of the total value locked sits with a small number of wallets, and whether the team retains any special administrative control, an 'admin key', that could override the supposedly decentralised rules. 'Decentralised' is a spectrum, not a guarantee, and it's worth checking where on that spectrum a specific DApp actually sits.
A reminder
The FCA risk warning still applies to higher-risk crypto content. Always assess how much risk you are willing to take before buying.
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