How Blockchain Works | Who Pays to Keep the Network Running?
A blockchain may distribute recordkeeping across participants, but servers, storage, software development, security and recovery still cost money. Some public networks use transaction fees and protocol incentives; permissioned networks may rely on participating organisations’ budgets. The costs and incentives are different questions.
This article is written for children, parents and adults who want to understand how the system actually works. The practical example is fictional and does not describe a deployed eduKateSG blockchain. No cryptocurrency purchases or real accounts are required.
A real question behind the technology
Three community libraries agree to share an equipment ledger. The first demonstration works. Six months later, one library asks who will pay for hosting, software updates, key management, technical support and the staff who resolve incorrect records. Nobody included those responsibilities in the launch celebration.
Before choosing a blockchain, ask whether a conventional database, signed record or accountable operator can meet the same need. The value of a shared ledger has to be established rather than assumed.
1. Transaction fees are not the whole cost
A user-facing fee may pay for a particular network operation, but it does not automatically cover application development, compliance, customer support, integrations or physical inspections. Some systems have no native cryptocurrency yet still require an operating budget.
2. Public network incentives are design-specific
Bitcoin’s proof-of-work mining and Ethereum’s proof-of-stake validation have different economic arrangements. Rewards, fees and penalties can influence participation, but the existence of incentives does not prove that a particular application is economically sustainable.
3. Permissioned networks need shared budgets
If each library operates a node, someone pays for hardware or hosting, maintenance and staff. The group needs an agreement about cost allocation, changes in membership and what happens if one partner cannot pay. A three-node diagram is not a business plan.
4. Measure the total cost of the outcome
Compare the blockchain option with an accountable database and signed receipts. Include downtime, security reviews, software upgrades, user training, evidence retrieval, incident response and eventual migration. Measure whether independent verification is worth those additional costs.
5. Plan for a member leaving
If one library withdraws, the others must know whether the network can continue, which data they may retain and who will maintain the shared record. An exit arrangement is part of the original cost model, not an afterthought.
A family activity: find the missing assumption
Draw three boxes labelled People, Digital Record and Real-World Result. Read the opening story and ask: If every transaction were free to the user, who would still pay to keep the service dependable? Invite the learner to name what can be checked, which person has authority and which fact still needs evidence.
Now change one condition. One organisation goes offline, an authorised officer makes a mistake or a website shows outdated information. Ask whether the record, the real-world outcome and the responsibility for correction are the same thing. They are not. Let the learner propose a simpler solution if it works.
What parents and adults should ask
Identify the exact requirement, participants, permissions, independent verification mechanism, source of outside facts and incident owner. Ask how the system handles delay, errors, recovery, privacy and the loss of an operating organisation.
A good decision includes a baseline comparison with conventional alternatives and a measurable outcome. Producing more blocks, attracting attention or using a fashionable label is not evidence that the original problem was solved.
Frequently asked questions
Does blockchain eliminate trust?
No. It can change who must be trusted for particular digital actions and what can be checked independently. Source data, software, keys, governance and human responsibility remain.
Do children need a real wallet to learn this?
No. Paper examples, invented records and clear role cards are enough to teach the important distinctions.
Is a more complicated system automatically more secure?
No. Security depends on the specific design, implementation, threat model, operational practice and assumptions. Complexity creates additional responsibilities as well as potential capabilities.
Continue through the learning library
For the specialist treatment, visit <a href=”https://edukatesg.com/portfolio/master-blockchain-080-operating-budget-fees-issuance-treasury/”>the related technical lesson</a>. Continue through the <a href=”https://edukatesg.com/master-blockchain-learning-guide/”>English Blockchain Learning Guide</a>, <a href=”https://edukatesg.com/master-blockchain-learning-guide-chinese/”>Simplified Chinese Learning Guide</a> and <a href=”https://edukatesg.com/master-blockchain/”>main Blockchain hub</a>.
Read <a href=”https://edukatesg.com/2026/10/13/how-blockchain-works-the-complete-system/”>The Complete System</a>, <a href=”https://edukatesg.com/2026/10/13/how-blockchain-works-closed-loop-system/”>Closed Loop System</a> and <a href=”https://edukatesg.com/2026/10/15/how-blockchain-works-what-blockchain-can-and-cannot-prove/”>What Blockchain Can and Cannot Prove</a> for the wider architecture and evidence boundaries.
Sources and scope
The relevant source is <a href=”https://hyperledger-fabric.readthedocs.io/en/latest/whatis.html”>https://hyperledger-fabric.readthedocs.io/en/latest/whatis.html</a>, with broader technical context in <a href=”https://csrc.nist.gov/pubs/ir/8202/final”>NIST IR 8202</a>. The story and activities are fictional teaching examples; the exact properties of a real blockchain depend on its implementation.
Takeaway: A blockchain may distribute recordkeeping across participants, but servers, storage, software development, security and recovery still cost money. Some public networks use transaction fees and protocol incentives; permissioned networks may rely on participating organisations’ budgets. The costs and incentives are different questions.