3.2.2.2. Session: Implementing Chain of Blocks

Writing Transactions in the Blockchain (30 minutes)

Begin the session with a brief recap of the conclusions from the previous session.
Explain to students that in blockchain networks, data records are transactions between users (e.g., User A sending cryptocurrency to User B).
Present the problem: "How should these transactions be structured and written in the chain of blocks to ensure security, transparency, and integrity?”
Encourage students to brainstorm and ideate different concepts on transaction records within blocks. They should focus on high-level ideas and concepts.
In groups, have students develop conceptual solutions for how transactions should be recorded in the chain of blocks. These solutions should outline the key components of a transaction record.

Transaction Concept Prototypes (30 minutes)

Instruct each group to choose one of their conceptual solutions for transaction records and outline a prototype for it. The prototype should provide a framework for how transaction data will be structured and linked within blocks.
Encourage students to think about nodes in the blockchain network and what information is necessary for them to validate the correctness of transactions.
Ask students to visually represent their ideated concepts using simple diagrams or sketches.
Instruct students to prepare visualization using the proposed framework for at least 10 transactions that are written in different blocks.

Group Discussion and Validation (30 minutes)

Invite all groups to present their proposed solutions and concepts.
Initiate a group discussion to review the visualized concepts and ideas.
Encourage students to validate these concepts and highlight if some concepts introduce problems for transaction confirmation in a blockchain network.
Ask questions like, "How would other nodes in the network know if User A wants to send funds to User B?”
Based on the presented concepts engage students to highlight the necessary components of transaction records in blockchain ⇒ Digital signature (Who?), Inputs and Outputs (how much and where), Balance (UTXO, account balance ⇒ does User A have enough balance).
Summarize the key insights and conclusions regarding writing records in a chain of blocks and conclude session by encouraging students to carry their understanding and ideation skills into the other modules.