Level: Low
FabLabs Course
3.2.2.1. Session: Introduction to Chain of Blocks
Data Record in Decentralized Systems (15 minutes)
- Begin by recapping the key concepts from the previous module on decentralized coordination.
- Present students with a problem scenario: In a blockchain network, multiple nodes must share and update common records or data. Emphasize the importance of these common records for coordination and trust among nodes.
- Ask students to share examples of data storage and types of data storage in everyday life (e.g. cloud storage).
- Encourage students to empathize with the challenge of maintaining consistency and trustworthiness when multiple nodes require access or update of common data.
- Pose questions for discussion:
- "How do you think nodes in a decentralized network should handle common records?”
- "Is it practical for each node to have its own separate copy of these common records?”
- "Is it necessary for each node to have its own separate copy of these common records?”
- Encourage creative thinking about how nodes can coordinate and maintain
shared records while upholding decentralization principles.
Defining the Blockchain Data Structure (15 minutes)
- In this phase provide a concise explanation of blockchain data structure. ⇒ using slides (2.2-chain_of_blocks.pptx)
- Explain that a blockchain comprises a chain of blocks, each containing a set of data records (transactions).
- Emphasize that each block is linked to the previous one, forming a chronological chain of records.
- Discuss why this structure is vital for recording and verifying transactions within a decentralized network.
- Briefly explain the cryptographic link between blocks. Mention that each block contains a reference to the previous block's cryptographic hash, creating a secure and tamper-evident connection.
- Emphasize that this linking mechanism ensures the integrity of the entire blockchain, as altering a single block would require changing all subsequent blocks.
- Conclude the session by recapping the important concepts.
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