Apps like Avacus are built on top of a system called "blockchain." This article explains what blockchain is, using as little technical jargon as possible.
Blockchain: A Shared Record of Transactions
In simple terms, a blockchain is "a record of transactions that anyone can check, and that is extremely difficult to alter after the fact."
Normally, a bank's transaction records are kept inside that bank's own computers. We can't check those records directly — we simply trust the bank's report that "this is your balance."
With blockchain, on the other hand, this record is shared and verified across a huge number of computers (called nodes) around the world. If just one computer tries to alter the record on its own, that change won't be accepted as valid.
Why Is It Called a "Chain"?
As transactions and other data are grouped together, a new page is added to the record. In blockchain, this "page" is called a "block."
Each new block always includes a summary of the previous block's contents. This links every block together like a chain.
If someone tried to secretly alter a past record, it wouldn't just affect that one block — it would break its link to every block that came after it. To fix these links, they would have to redo the massive calculations required for each individual block, all while other participants continue adding honest records at the same time.
>Because it is practically impossible for an attacker to catch up to and overtake that pace, altering past records is considered extremely difficult.
Who Manages the Record?
Just because "everyone" holds a copy of the record doesn't mean a single company or country is in charge of it. Various participants around the world each keep their own copy of the record on their own computers, and take part in verifying whether new transactions are valid according to a set of agreed-upon rules.
This kind of system — where no single organization manages the record, and the network is instead supported by many participants — is called "decentralized." When apps like Avacus say "you manage your own assets," this is possible because assets on the blockchain can be controlled directly by you, using your private key.
Why Does Being "Decentralized" Matter?
Some people are drawn to blockchain hoping for price gains, but that's not the only reason people find it valuable. Many people see value in the decentralized system itself.
For example:
- It's difficult for any single company or government to unilaterally alter the blockchain's records or shut down the entire network
- Because anyone can check the records, unauthorized changes are easier to spot, making transactions more transparent
- People without a bank account can also, in some cases, hold and send digital assets without going through a bank, as long as they have access to the necessary technology and services
In other words, blockchain isn't just a "convenient technology" — it's also seen as the foundation for realizing an idea (a philosophy): building a system that anyone can participate in and verify, without relying on a single authority.
We at Avacus share this belief in decentralization, and it's what drives our work every day.
What's the Difference Between Ethereum, Polygon, and BNB Smart Chain?
These are all names of separate, independent "blockchains (networks)." They share the same basic mechanism of sharing transaction records, but each differs in things like which computers participate and the rules used to verify and record transactions.
For more on the differences between the networks Avacus supports, see About the Networks Avacus Supports.
Summary
- A blockchain is a shared record of transactions that is "extremely difficult to alter"
- Records are grouped into units called "blocks," which are linked together like a chain
- Rather than being managed by a single organization, the record is stored and verified by many participants around the world
- Ethereum, Polygon, and others are each names of separate, independent blockchains (networks)