Understanding the Blockchain

I have been trying to wrap my head around blockchain technology for a long time. Merriam-Webster defines the idiom of wrapping your mind around; To find a way to understand or accept (something).

I have asked myself, what is a blockchain? What are its characteristics? And how can someone describe it?

Below are bits and pieces that I have read in books and learned from studying online about it.

A blockchain is a chain of attached records that uses cryptography. Whatever amount of data or transactions are in a blockchain, they are secure from any changes.

A blockchain is a decentralized database, or open ledger, where every transaction is recorded and open for everyone else. For instance: The Bitcoin blockchain records every transaction that is done, to or from, a public Bitcoin address. It does not expose private information about the person who owns those addresses, nor does it disclose any private keys. Everyone running nodes connected to that blockchain will have access to see any of those transactions.

A block on a blockchain is simply a place that stores data. Every block has its fingerprint or what is known as a hash. Every block in a blockchain includes the Hash from the previous block.

Miners in the Bitcoin blockchain are the ones who validate blocks. They get rewarded for solving a complex mathematical problem if they are the first one to solve it. The first one to solve the complex problem can add that block (or set of data with transactions) to the blockchain. Blocks on the Bitcoin blockchain added about every 10 minutes.
The process which you have often heard about is called Proof of Work. The miners’ reward is now 6.25 BTC for every block that they add.

I found a straightforward but excellent definition of what a blockchain is on blockgeeks.com:
A blockchain is, in the simplest of terms, a time-stamped series of immutable records of data that is managed by a cluster of computers not owned by any single entity. Each of these blocks of data is secured and bound to each other using cryptographic principles (i.e., chain).

I have found that different blockchains have different ways of operating. Many are Public, but some are Private. Blockchains run differently in their ecosystems and address many kinds of problems.
Most blockchains contain the following:

*A database that stores data in real-time.
*Cryptographic signatures and hash references. *Records that are unchangeable.
*Person to person data sharing (Peer to Peer).
*The ability to broadcast data to everyone connected (running nodes) on that blockchain.

The key to a public blockchain is that everyone participating in the blockchain network checks everything. Everyone can see what is going on.

Anyone can view the contents of a public blockchain. Users can choose to connect their computers to a blockchain via network nodes. If linked, the computer software will receive a copy of that blockchain and is automatically updated when a new block gets added to the blockchain.

So, who uses blockchain technology besides Bitcoin? There are many other uses and users. Ethereum network primarily uses its’ blockchain for smart contracts. Walmart has a blockchain that monitors the supply chain of their products to determine where the errors are along the manufacturing and shipping process.

101blockchains.com gives a good list of companies now using blockchain technology as of January 26, 2020. Below are a dozen of them that you will recognize:

Barclays, DHL,Singapore Airlines,Walmart, AIG, British Airways,Anheuser Busch, Shell Energy, Scotiabank,Ford Siemens, AIA Group

What helped me wrap my head around how blockchains function was a simple video I found on deloitte.com of a woman explaining a blockchain in under 100 words. It is one of the most uncomplicated and clear definitions of the mechanics of how a blockchain works.

I transcribed what she said, word for word, from her video. Below the link is her explanation:

You are a node. You have a file transaction on your computer (let’s call that your ledger). You are working with some accountants (let us call them Miners) who have the same file on their computers, so now its distributed. You send a reply-all email to all these accountants to see if you have enough money to make a big purchase. They rush to review your file as they want to get paid in their salary (let us call that Bitcoin). The first accountant to review your request and validate it along with their reasoning (which is called Proof of Work) sends this to the other accountants. If the other accountants agree with their thinking, then you have a consensus in the network. They can then add a new block to the blockchain. Now you can make that big purchase.

This scenario above sounds simple enough, but it finally allowed me to understand the mechanics of a blockchain. Blockchains are, of course, very complicated than all of this. They are best left to the techies to figure it all out. At least now, I have a better grasp of what they are all about and how they work.

About the author

Jeff is a Compumatrix member and contributor who truly enjoys researching and learning about all things crypto. He believes that digital assets are the future of money.


  1. Thanks Jeff for the reminder. Everytime I read explanations like this one, I learn something new. Smart contracts seem to be the next wave of new technology to go parabolic. It seems the alt’s are doing quite well. I assume this may be with the adoption of their of numerous platforms like Ethereum and Chainlink. I love the diversification of all of these platforms being decentralized and uncontrollable by any one entity. Thanks again for the update on Blockchain.

  2. Thank you for sharing, this will be very helpful when newbies are coming in and learning. The more we share and spread the better off we all are. Breaking things down helps us all understand. Reading on something every day is a must. Especially for our group. Just going in and reading the comments help me to feel more connected to the group. Some day I hope we have a big family reunion. That would be amazing. But keep educating yourself. Some will stick some won’t but give it a shot.

  3. Thank you Tracy. I am all for a big family reunion. I know that this will indeed happen someday in the future. I think the plan is to have it on a cruise ? Our group here from all over the world has a wealth of knowledge and I am so glad we now have a space where people can share it and we can learn so much from them. Knowledge is power for sure. You have heard the phrase live and learn ? I say you cannot “live” without learning……

  4. Jeff another home run in your blog posting — I am just appreciative of the time and effort you put into your blogs — they truly at least for me help me become much more at ease and comfortable in this Crypto world and hoping that learning this all new way of doing business — it is good to have quality help — thank you for great posting — keep writing —

  5. Amazing lesson Mr. Jeff, about the Blockchain Technology. Well described, that the Blockchain is a master reference book of an accounting system. Which provides a permanent and classified record of every element in the Cryptocurrency operation. Where the transactions of similar nature relating to a particular person e.g. in the “Compumatrix Digital Assets Platform” is recorded and stored in a secured classified form.

  6. Thank you RJH ! You are always so edifying with your comments and it’s good to have such positive feedback. So many of us here at Compumatrix have such a wealth of knowledge, I am so glad they opened up this avenue for people to share what they have found out in the crypto world. Thanks again !

  7. again reading and learning and this time around –this explanation in its simplest form is almost understandable to older type less tech savvy guy — and when you put this with other postings — the knowledge is accessible and my comfort zone part is growing with each read and day here learning — much thanks —

  8. Good post, Jeffery. Your description of the blockchain is understandable to me. All this new technology can be overwhelming, especially when we knew nothing, nada, zilch about the crypto world. From Gails training and the blogs here, we learn more and more. It is interesting to read the different views, that brings us to the same outcome.

  9. Thank you Carmen. I too love Gails blogs and she is always bringing up new and cutting edge topics about the crypto world that I have never even heard about. There is so much to learn and it seems to just keep increasing. I am glad that we will not have to know ALL the technical ins and outs of the CDAP before we will be able to use it. Like driving a car, don’t know much about how it works, but know enough to be able to drive it.

  10. after reading a couple new blogs coming back here and reading n learning what simple explain on blockchain — just makes the whole picture a clearer more understandable project — still have much to learn but so much help around here in the blog area does make it possible — much appreciation truly —

  11. Jeff, Very good post,You have explained blockchain technology very clearly,helped a lot in understanding blockchain technology,there is a lot to learn from daily blog posts,lot to learn about different cryptocurrencies.Thank you for sharing an informative blog.

  12. well as you can see — am here reading and learning even more simple but Substantive information — i read that definition under 100 words half dozen more times — when you put simplicity in the tech arena and non human arena –then you take out error and that in itself keeps it simple –i think lol ??? i just wish i was 10 again and my brain n mind was open to New — ??? but — great stuff here JP

  13. The explanation describing the blockchain reminds me of the car buying experience. As in buying a car, there is a file transaction, you are working with some accountants (or the finance department) to see if you have enough money to make a big purchase.

  14. as we enter the newest year and seem to be ever so close to to taking that next step — figured it would not hurt to read n re-read this and just work at the simple but awesome look at a Blockchain n blockchain technology — it is simple but so Perfect in a sense and for me it takes the deception n deceptors out of picture — it is like Quiet Truth Always — and nothing better for my Biz —

  15. Very good info Jeff .. interesting Blog on the Blockchain technology … I am learning everyday something new . I guess with what we are doing there will always be things to learn. Your blog Jeff helped me fill in some more gaps . I will be looking forward to more of your blogs in the future ..
    Thanks again .

  16. Jeff you are a great teacher, you have explained how blockchain works so well in a layman’s language that even the simple minds as far as blockchain technology is concerned can understand.Thank you for transcribing the video,it has come out to me very clearly, well understood!

  17. Wonderful article Jeff about what is ‘Blockchain’ really about.We need to learn the basics of blockchain if we plan to get involved in crypto currencies and Bitcoin,as understanding it will make us a better judge about how and when to invest in which crypto currencies.

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