The current bitcoin blockchain design is regarded as having two shortcomings.Ī new block is added to the chain at random intervals averaging, by design, ten minutes ( proof-of-work causes this delay). ( November 2019) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources. ![]() These fake blocks would be detected, but doing so would take a very long time, slowing down the whole system. However, this allowed malicious actors to make up fake "block" data that was very long as a form of denial-of-service attack (DoS attack). Originally, there was no limit to the size of blocks. ![]() Įach block contains information about who sends and receives a given unit of bitcoin (a transaction), as well as the signature that approves each transaction. This forms a chain of blocks, or a blockchain. History Block size limit īitcoin is a cryptocurrency, a form of money using cryptography to keep transactions secure.Įach record of a unit of bitcoins is called a "block", and all blocks are tied together sequentially by using a cryptographic hash on the previous block and storing its output in the next.
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