Bitcoin created a lot of buzz on the Internet. It was ridiculed, it was attacked, and eventually it was accepted and became a part of our lives. However, Bitcoin is not alone. At this moment, there are over 700 AltCoin implementations, which use similar principles of CryptoCurrency.

So, what do you need to create something like Bitcoin?

Without trying to understand your personal motivation for creating a decentralized, anonymous system for exchanging money/information (but still hoping that it is in scope of moral and legal activities), let’s first break down the basic requirements for our new payment system:

  1. All transactions should be made over the Internet
  2. We do not want to have a central authority that will process transactions
  3. Users should be anonymous and identified only by their virtual identity
  4. A single user can have as many virtual identities as he or she likes
  5. Value supply (new virtual bills) must be added in a controlled way

Decentralized Information Sharing Over Internet

Fulfilling the first two requirements from our list, removing a central authority for information exchange over the Internet, is already possible. What you need is a peer-to-peer (P2P) network.

Information sharing in P2P networks is similar to information sharing among friends and family. If you share information with at least one member of the network, eventually this information will reach every other member of the network. The only difference is that in digital networks this information will not be altered in any way.

Cryptocurrency and Toptal

You have probably heard of BitTorrent, one of the most popular P2P file sharing (content delivery) systems. Another popular application for P2P sharing is Skype, as well as other chat systems.

Bottom line is that you can implement or use one of the existing open-source P2P protocols to support your new cryptocurrency, which we’ll call Topcoin.

Hashing

To understand digital identities, we need to understand how cryptographic hashing works. Hashing is the process of mapping digital data of any arbitrary size to data of a fixed size. In simpler words, hashing is a process of taking some information that is readable and making something that makes no sense at all.

You can compare hashing to getting answers from politicians. Information you provide to them is clear and understandable, while the output they provide looks like random stream of words.

P2P Protocols

There are a few requirements that a good hashing algorithm needs:

  1. Output length of hashing algorithm must be fixed (a good value is 256 bytes)
  2. Even the smallest change in input data must produce significant difference in output
  3. Same input will always produce same output
  4. There must be no way to reverse the output value to calculate the input
  5. Calculating the HASH value should not be compute intensive and should be fast

If you take a look at the simple statistics, we will have a limited (but huge) number of possible HASH values, simply because our HASH length is limited. However, our hashing algorithm (let’s name it Politician256) should be reliable enough that it only produces duplicate hash values for different inputs about as frequently as a monkey in a zoo manages to correctly type Hamlet on a typewriter!

If you think Hamlet is just a name or a word, please stop reading now, or read about the Infinite Monkey Theorem.

Digital Signature

When signing a paper, all you need to do is append your signature to the text of a document. A digital signature is similar: you just need to append your personal data to the document you are signing.

If you understand that the hashing algorithm adheres to the rule where even the smallest change in input data must produce significant difference in output, then it is obvious that the HASH value created for the original document will be different from the HASH value created for the document with the appended signature.

A combination of the original document and the HASH value produced for the document with your personal data appended is a digitally signed document.

And this is how we get to your virtual identity, which is defined as the data you appended to the document before you created that HASH value.

Next, you need to make sure that your signature cannot be copied, and no one can execute any transaction on your behalf. The best way to make sure that your signature is secured, is to keep it yourself, and provide a different method for someone else to validate the signed document. Again, we can fall back on technology and algorithms that are readily available. What we need to use is public-key cryptography also known as asymmetric cryptography.

To make this work, you need to create a private key and a public key. These two keys will be in some kind of mathematical correlation and will depend on each other. The algorithm that you will use to make these keys will assure that each private key will have a different public key. As their names suggest, a private key is information that you will keep just for yourself, while a public key is information that you will share.

If you use your private key (your identity) and original document as input values for the signing algorithm to create a HASH value, assuming you kept your key secret, you can be sure that no one else can produce the same HASH value for that document.

How Bitcoin and Cryptocurrency works

If anyone needs to validate your signature, he or she will use the original document, the HASH value you produced, and your public key as inputs for the signature verifying algorithm to verify that these values match.

How to send Bitcoin/Money

Assuming that you have implemented P2P communication, mechanisms for creating digital identities (private and public keys), and provided ways for users to sign documents using their private keys, you are ready to start sending information to your peers.

Since we do not have a central authority that will validate how much money you have, the system will have to ask you about it every time, and then check if you lied or not. So, your transaction record might contain the following information:

  1. I have 100 Topcoins
  2. I want to send 10 coins to my pharmacist for the medication (you would include your pharmacists public key here)
  3. I want to give one coin as transaction fee to the system (we will come back to this later)
  4. I want to keep the remaining 89 coins

The only thing left to do is digitally sign the transaction record with your private key and transmit the transaction record to your peers in the network. At that point, everyone will receive the information that someone (your virtual identity) is sending money to someone else (your pharmacist’s virtual identity).

Your job is done. However, your medication will not be paid for until the whole network agrees that you really did have 100 coins, and therefore could execute this transaction. Only after your transaction is validated will your pharmacist get the funds and send you the medication.

Miners - New Breed of Agents

Miners are known to be very hard working people who are, in my opinion, heavily underpaid. In the digital world of cryptocurrency, miners play a very similar role, except in this case, they do the computationally-intensive work instead of digging piles of dirt. Unlike real miners, some cryptocurrency miners earned a small fortune over the past five years, but many others lost a fortune on this risky endeavour.

Miners are the core component of the system and their main purpose is to confirm the validity of each and every transaction requested by users.

In order to confirm the validity of your transaction (or a combination of several transactions requested by a few other users), miners will do two things.

First, they will rely on the fact that “everyone knows everything,” meaning that every transaction executed in the system is copied and available to any peer in the network. They will look into the history of your transactions to verify that you actually had 100 coins to begin with. Once your account balance is confirmed, they will generate a specific HASH value. This hash value must have a specific format; it must start with certain number of zeros.

There are two inputs for calculating this HASH value:

  1. Transaction record data
  2. Miner’s proof-of-work

Considering that even the smallest change in input data must produce a significant difference in output HASH value, miners have a very difficult task. They need to find a specific value for a proof-of-work variable that will produce a HASH beginning with zeros. If your system requires a minimum of 40 zeros in each validated transaction, the miner will need to calculate approximately 2^40 different HASH values in order to find the right proof-of-work.

Once a miner finds the proper value for proof-of-work, he or she is entitled to a transaction fee (the single coin you were willing to pay), which can be added as part of the validated transaction. Every validated transaction is transmitted to peers in the network and stored in a specific database format known as the Blockchain.

But what happens if the number of miners goes up, and their hardware becomes much more efficient? Bitcoin used to be mined on CPUs, then GPUs and FPGAs, but ultimately miners started designing their own ASIC chips, which were vastly more powerful than these early solutions. As the hash rate goes up, so does the mining difficulty, thus ensuring equilibrium. When more hashing power is introduced into the network, the difficulty goes up and vice versa; if many miners decide to pull the plug because their operation is no longer profitable, difficulty is readjusted to match the new hash rate.

Blockchain - The Global Cryptocurrency Ledger

The blockchain contains the history of all transactions performed in the system. Every validated transaction, or batch of transactions, becomes another ring in the chain.

So, the Bitcoin blockchain is, essentially, a public ledger where transactions are listed in a chronological order.

The first ring in the Bitcoin blockchain is called the Genesis Block

To read more about how the blockchain works, I suggest reading Blockchain Technology Explained: Powering Bitcoin, by Nermin Hajdarbegovic.

There is no limit to how many miners may be active in your system. This means that it is possible for two or more miners to validate the same transaction. If this happens, the system will check the total effort each miner invested in validating the transaction by simply counting zeros. The miner that invested more effort (found more leading zeros) will prevail and his or her block will be accepted.

Controlling The Money Supply

The first rule of the Bitcoin system is that there can be a maximum of 21,000,000 Bitcoins generated. This number has still not been achieved, and according to current trends, it is thought that this number will be reached by the year 2140.

This may cause you to question the usefulness of such a system, because 21 million units doesn’t sound like much. However, Bitcoin system supports fractional values down to the eight decimal (0.00000001). This smallest unit of a bitcoin is called a Satoshi, in honor of Satoshi Nakamoto, the anonymous developer behind the Bitcoin protocol.

New coins are created as a reward to miners for validating transactions. This reward is not the transaction fee that you specified when you created a transaction record, but it is defined by the system. The reward amount decreases over time and eventually will be set to zero once the total number of coins issued (21m) has been reached. When this happens, transaction fees will play a much more important role since miners might choose to prioritize more valuable transactions for validation.

Apart from setting the upper limit in maximum number of coins, the Bitcoin system also uses an interesting way to limit daily production of new coins. By calibrating the minimum number of leading zeros required for a proof-of-work calculation, the time required to validate the transaction, and get a reward of new coins, is always set to approximately 10 minutes. If the time between adding new blocks to the blockchain decreases, the system might require that proof-of-work generates 45 or 50 leading zeros.

So, by limiting how fast and how many new coins can be generated, the Bitcoin system is effectively controlling the money supply.

Start “Printing” Your Own Currency

As you can see, making your own version of Bitcoin is not that difficult. By utilizing existing technology, implemented in an innovative way, you have everything you need for a cryptocurrency.

  1. All transaction are made over the Internet using P2P communication, thus removing the need for a central authority
  2. Users can perform anonymous transactions by utilizing asynchronous cryptography and they are identified only by their private key/public key combination
  3. You have implemented a validated global ledger of all transactions that has been safely copied to every peer in the network
  4. You have a secured, automated, and controlled money supply, which assures the stability of your currency without the need of central authority

One last thing worth mentioning is that, in its essence, cryptocurrency is a way to transfer anonymous value/information from one user to another in a distributed peer-to-peer network.

Consider replacing coins in your transaction record with random data that might even be encrypted using asynchronous cryptography so only the sender and receiver can decipher it. Now think about applying that to something like the Internet Of Things!

A cryptocurrency system might be an interesting way to enable communication between our stove and toaster.

A number of tech heavyweights are already exploring the use of blockchain technology in IoT platforms, but that’s not the only potential application of this relatively new technology.

If you see no reason to create an alternative currency of your own (other than a practical joke), you could try to use the same or similar approach for something else, such as distributed authentication, creation of virtual currencies used in games, social networks, and other applications, or you could proceed to create a new loyalty program for your e-commerce business, which would reward regular customers with virtual tokens that could be redeemed later on.

About the author

Demir Selmanovic, Bosnia and Herzegovina
member since May 23, 2014
Demir is a developer and project manager with over 15 years of professional experience in a wide range of software development roles. He excels as a solo developer, team member, team leader, or manager of multiple distributed teams. He works closely with clients to define ideas and deliver products. [click to continue...]
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Comments

Eki Eqbal
Thanks for sharing, now Bitcoin makes sense to me :) "You can compare hashing to getting answers from politicians. Information you provide to them is clear and understandable, while the output they provide looks like random stream of words." -> Genius :)
Bahri
This was a great explanation of how bitcoin works. But, I still dont know on what its value is based on. I mean how its determined that a specific amount of such currency is worth this much?
Barun Saha
Nice article, and great illustrations! However, how does one "earn" virtual money? And how is it related to physical currency?
Demir Selmanovic
Value of any currency is a matter of more complex economics related to it's use. Bitcoins are even less valuable than the paper bills and "real" money, considering that Bitcoins are just digital information and paper bills had to be printed. Value comes from the items related to actual coins and what they represent.
Demir Selmanovic
Easiest way to earn Bitcoins is to have someone pay you in Bitcoins, just like you would get paid in any currency. Relation between any two currencies, including Bitcoin, in simplest possible explanation is "how much of some goods can you buy in Bitcoins vs other currency". You can always check http://www.coindesk.com/price/ to check latest status.
Miguel
Hi, great article :) I think I don't fully understand the part of mining and the "proof-of-work" part. You wrote: """Once your account balance is confirmed, they will generate a specific HASH value. This hash value must have a specific format; it must start with certain number of zeros.""" So, a miner receives a transaction record data, confirms somehow the balance of the user, and generates a Hash. """ There are two inputs for calculating this HASH value: 1. Transaction record data 2. Miner’s proof-of-work """ So, the miner has to find, *for each transaction*, a numerical "seed" that after passing through an algorithm produces a hash result starting by X zeroes? What would be that hashing algorithm? the same hash used to sign the transaction record received? Thank you in advance! PS: Do you know any more good sources to read deeper about bitcoin mining?
Demir Selmanovic
Hi Miguel, You understood the text well. Proof of work has to be calculated for each transaction (or several transactions in a batch). Hash value calculated over combination of transaction data and this proof of work has to start with X zeros. Bitcoin is using SHA256 for Blockchain hashing (https://en.bitcoin.it/wiki/Block_hashing_algorithm) Not sure what kind of resources you are looking for. But I guess the best way to check internals is https://github.com/bitcoin/bitcoin
Petr Mlčoch
From book "ECONOMICS OF GOOD AND EVIL" : 'Currency is merely an expression of confidence, that owner will receive from acceptor services or items corresponding to the value printed on it. Both of them have to share this confidence.' If you have 10 dollars, you have nice piece of paper in galaxy far far away. You have to find someone, who believes in it's value.
Chris DeRose
There's a a number of fairly innacurate statements in here. I'd recommend my own series on the matter as a better starting point. (Search for "Chris DeRose American Banker")
Chris DeRose
It's value is set by the market. Same as any other commodity (such as gold)
Chris DeRose
That is incorrect. Bitcoin has intrinsic value (it's redeemable for real estate on the World Wide Ledger) whereas paper money does not have any intrinsic value. The seniorage costs do not factor into the valuations of these currencies at all.
Chris DeRose
Unfortunately, this analogy is completely wrong. Hashing is a process of attesting to the rendering of useable value into thermodynamic waste. This function is what attests to 'stake' in a block. This stake is what the network uses to determine who spent the most on attesting to their truth.
Chris DeRose
Mining is a process by which miners assert truth by burning energy. The hashing function is a signature that asserts how much energy was burned by the miner. Balances are not tracked by miners per-se, Bitcoin is a triple ledger accounting system, by which 'checks' are written against the output of unspent checks. Miners merely track the unspent checks in the system, and the balances unspent on those checks. I go into this system at great length here: https://www.youtube.com/watch?v=Dn6q9nveJbA
Joshua Unseth
Re-wrote this crappy article. http://junseth.com/post/126347086117/cryptocurrency-for-dummies-bitcoin-and-beyond
Joshua Unseth
I re-wrote this crappy article. http://junseth.com/post/126347086117/cryptocurrency-for-dummies-bitcoin-and-beyond
Joshua Unseth
I re-wrote this crappy article. So now it makes sense: http://junseth.com/post/126347086117/cryptocurrency-for-dummies-bitcoin-and-beyond
Joshua Unseth
Demir, you are wrong about how mining works. You should read my re-write of your article to clear up confusion. http://junseth.com/post/126347086117/cryptocurrency-for-dummies-bitcoin-and-beyond
David Krmpotic
On the facts that you and you alone own your money (no banks), that you can send money directly without middlemen and that it is scarce and thus not prone to inflation / printing money. These things are valuable even if Bitcoin is just math and a concept.
Demir Selmanovic
Hi David, I agree with you 100% and these are great and VALUABLE things. However, this alone does not put full value to Bitcoin directly. If you consider just these characteristics, than any of 700+ implementations would have the same, or similar, value as they all provide the same thing.
Demir Selmanovic
Analogy is related to hashing as a process of mapping a digital arbitrary size data to fixed size data (https://en.wikipedia.org/wiki/Hash_function). It has nothing to do with actual use of hashing in any specific case. So I still think that this analogy is perfect :)
David Krmpotic
I forgot to mention "being the first real cryptocash". This is also valuable.
Chris DeRose
Hashing is for notarization and/or identity. While certainly both functions 'truncate' the corpus into a fixed field size, to suggest that this truncation alone is the goal, completely glosses over the economic complexity of this operation. As for politicians, I do not see how they fit into an analogy relating to notorization, identity, or even truncation.
Donny Mitsov
Very helpful explanation of the basics of bitcoin.
Hua Li
The cost of the used electricity for mining bitcoin is the basic value, and the revolutionized function acting as money the traditional fiat cannot compare with.
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About the author
Demir Selmanovic
JavaScript Developer
Demir is a developer and project manager with over 15 years of professional experience in a wide range of software development roles. He excels as a solo developer, team member, team leader, or manager of multiple distributed teams. He works closely with clients to define ideas and deliver products.