Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M1563

Blockchain

Blockchain
TechnicalHigh supportComputer Science
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

Blockchain is a peer-to-peer network system that establishes and stores a large chain of transaction data through technologies such as cryptography and consensus mechanisms. Each block contains the cryptographic hash of the previous block, a corresponding timestamp, and transaction data (usually represented by a hash value computed using the Merkle tree algorithm). This design makes the content of blocks difficult to tamper with. However, if one controls 51% or more of the computing power of blockchain nodes, the content of the blockchain can be manipulated. Moreover, if the initially written content is erroneous, blockchain technology actually makes it difficult to correct the erroneous content. Currently, the largest application of blockchain technology is cryptocurrency, such as the invention of Bitcoin. Because the essence of payment is to "increase the amount in account B by the amount decreased from account A." If people have a public ledger that records all transactions of all accounts up to now, then for any account, one can calculate its current balance. The public blockchain (public chain) is precisely the public ledger used to achieve this purpose. In the Bitcoin system, Bitcoin addresses correspond to accounts, and the amount of Bitcoin corresponds to the balance.

SCAFFOLDING EFFECT

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Reduce cognitive load

Blockchain is a peer-to-peer network system that establishes and stores a large chain of transaction data through technologies such as cryptography and consensus mechanisms. Each block contains the cryptographic hash of the previous block, a corresponding timestamp, and transaction data (usually represented by a hash value computed using the Merkle tree algorithm). This design makes the content of blocks difficult to tamper with. However, if one controls 51% or more of the computing power of blockchain nodes, the content of the blockchain can be manipulated.

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Blockchain is an append-only distributed ledger: transactions are packaged into blocks, and blocks are cryptographically hashed and linked into a chain; the entire network reaches consensus on the state of the ledger through consensus mechanisms (such as PoW/PoS), making it difficult for a single party to tamper with the data. It replaces "trust in third parties" with "trust in code and mathematics," achieving decentralized verification and anti-counterfeiting.

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Source support: Explicit

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