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Blockchain explained… in under 100 words

Posted: November 26, 2016 at 10:12 am   /   by   /   comments (0)

G U E S T  A R T I C L E


recently attended an industry seminar where the concept of the block chain was explained. At the end of the session, walking out of the lecture room I heard one of the attendees say to a colleague “I’m still not sure what exactly Blockchain is…”.

Many of us know that Blockchain is a topic that is hot at the moment. It’s a topic that is disruptive. It’s a topic that is accelerating. 

And that may be your elevator pitch...

But now imagine your elevator stops between floors and you are asked “Great overview – but can you explain to me how it really works?”.

Here is my attempt to explain the original intent of the Blockchain in fewer than 100 words.

You (a “node”) have a file of transactions on your computer (a “ledger”). Two government accountants (let’s call them “miners”) have the same file on theirs (so it’s “distributed”). As you make a transaction, your computer sends an e-mail to each accountant to inform them.

Each accountant rushes to be the first to check whether you can afford it (and be paid their salary “Bitcoins”). The first to check and validate hits “REPLY ALL”, attaching their logic for verifying the transaction (“Proof of Work“). If the other accountant agrees, everyone updates their file…

This concept is enabled by “Blockchain” technology.

Surely it’s more complicated?

Yes – but as a concept, not much more. Complexities come in the implementation and the journey to realize value from such implementations. The above example will, of course, be overly simplistic for some – but may be a starting point for others.

In a traditional environment, trusted third parties act as intermediaries for financial transactions. If you have ever sent money overseas, it will pass through an intermediary (usually a bank). It will usually not be instantaneous (taking up to 3 days) and the intermediary will take a commission for doing this either in the form of exchange rate conversion or other charges.

The original Blockchain is open-source technology which offers an alternative to the traditional intermediary for transfers of the crypto-currency Bitcoin. The intermediary is replaced by the collective verification of the ecosystem offering a huge degree of traceability, security and speed.

In the example above (a “public Blockchain”), there are multiple versions of you as “nodes” on a network acting as executors of transactions and miners simultaneously. Transactions are collected into blocks before being added to the block chain. Miners receive a Bitcoin reward based upon the computational time it takes to work out a) whether the transaction is valid and b) what is the correct mathematical key to link to the block of transactions into the correct place in the open ledger. As more transactions are executed, more Bitcoins flow into the virtual money supply. The “reward” miners get will reduces every 4 years until Bitcoin production will eventually cease (although estimates say this won’t be until 2140!). Of course, although the original Blockchain was intended to manage Bitcoin, other virtual currencies, such as Ether, can be used.

Why do I need to know about Blockchain?

There are three reasons why you need to know about Blockchain:

  1. Blockchain technology doesn’t have to exist publicly. It can also exist privately – where nodes are simply points in a private network and the Blockchain acts similarly to a distributed ledger. Financial institutions specifically are under tremendous pressure to demonstrate regulatory compliance and many are now moving ahead with Blockchain implementations. Secure solutions like Blockchain can be a crucial building block to reduce compliance costs.
  2. Block-chain technology is broader than finance. It can be applied to any multi-step transaction where traceability and visibility is required. Supply chain is a notable use case where Blockchain can be leveraged to manage and sign contracts and audit product provenance. It could also be leveraged for votation platforms, titles and deed management – amongst myriad other uses. As the digital and physical worlds converge, the practical applications of Blockchain will only grow.
  3. The exponential and disruptive growth of Blockchain will come from the convergence of public and private Blockchains to an ecosystem where firms, customers and suppliers can collaborate in a secure, auditable and virtual way.

I hope that helps in your Blockchain conversations – happy mining!

Edit: 17-11-2016 – after some requests for clarification, I have added some extremely simple explanation on the consensus method in the analogy above.

All views in this post are my own.

About the author:


Richard Bradley

Richard Bradley is the Director in the Supply Chain practice at Deloitte, Switzerland. View Richard’s full profile at Linkedin.



ASQ Ottawa

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