2016 Annual BIEN Congress

Posted April 4, 2016

We are pleased to announce that Art | Code Tess Gadwa and Attention Based Currency Chief Scientist Scott Little, Ph.D. have been selected to present their paper on Attention Based Currency (ABC) and Universal Basic Income (UBI) at the 16th annual BIEN Congress, defining a new model for application of the attention-based cryptocurrency to this specific problem set.

Attention Based Currency (ABC) is a cryptocurrency generated by the interaction of Internet users with streaming media. Listening records are secure and encrypted, but the algorithm rewards listeners who seek out and share new content as “early adopters.” ABC is a market-based approach that can be used independently or in tandem with more traditional government-funded or philanthropic UBI programs.

The conference will take place from July 7-9 in Seoul, South Korea.

Guest Post: Cryptocurrency for Dummies

Posted March 28, 2016

By Delmir Selmanovic. Reprinted with permission.

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.


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 asasymmetric 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 theBlockchain.

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 feethat 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.

Yes Exactly at South by Southwest Music Festival

Posted March 24, 2015

Yes Exactly represents at the South by Southwest Music Festival. Austin, Texas.

In line EA and TG Here we are at South by Southwest Music Festival. We like to think we might have been the most indie/DIY professionals there at the entire festival. (We brought our own sandwiches and granola bars, anyway.)
Single Mothers Then again, maybe we were just there to be fans and take in some awesome music. Here are The Single Mothers, just one of the bands we saw.
TG Our artists' music service, Million Song Mixtape, is a streaming music service that generates cryptocurrency for artists and fans. Its purpose is to improve financial conditions in the music industry with special attention paid to independent artists and musicians from non-Western musical traditions. We launch in June. Learn how you can be part of the Million Song Mixtape at http://www.millionsongmixtape.com

ABC featured in the The Stranger

Posted January 23, 2015

Great blog post about us today from Dave Segal of Seattle's newspaper The Stranger:

Attention Based Currency Could Help Artists Get Paid Fairly When Their Music's Streamed

"Musicians' gripes about insultingly tiny payouts from streaming services like Spotify and YouTube have been widespread. Tess Gadwa, co-founder of Attention Based Currency and CEO of Yes Exactly, is planning to create a platform that will fairly compensate musicians for digital consumption of their work. She saw an entry into the market in the wake of Bitcoin's devaluation. Ergo, Attention Based Currency..."

Why Bitcoin Failed

Posted January 14, 2015
Category bitcoin

Just one week ago, I had a lengthy conversation with a local convenience store owner while buying milk and juice. He had recently raised his credit card minimum to $10. He was frustrated in equal parts by the high transaction fees he was forced to pay on low-dollar items, and the large number of customers who no longer carried cash. When I explained to him that Bitcoin was an electronic payment system that can eliminate or drastically reduce merchant transaction fees, he got excited. I asked him if he would choose to have an ATM in the corner of his store where consumers could purchase Bitcoin using a credit or debit card; his answer was emphatically yes.

The problem, is Bitcoin isn’t being used in place of cash.

When a currency loses 50% of its value within the space of two weeks, and with a 24-hour low of $160, is down to just over 12.8% of its peak value of $1242, it is no longer able to function as a currency. It is a commodity only.

For all the day traders who will be scratching their heads and wondering what happened in the weeks to come, here are a few key reasons for the decline in Bitcoin’s value:

(HINT) It’s not security. Exchanges like Mt. Gox and Bitstamp get hacked, just like banks get robbed. This has nothing to do with the underlying security of a technology that functions like cash. The problem is, not enough people understood that.

Which brings us to…

1. Poor Usability. In terms of ease of use and help resources available, the Bitcoin (BTC) wallets I have used range from truly abysmal to just about comparable to your average online banking or credit card site. This is a heart-rending shame because BTC has the potential to be a one-click currency: as seamless and easy as “liking” on Facebook, or paying for a pack of gum with cash. No need to spend precious time rummaging through your wallet and entering long strings of credit card numbers. Coinbase made some strides in this direction, but implementation was uneven and still required too many mouse clicks.

2. No Ability to Tax and Spend. Unlike a government printing fiat currency, Bitcoin could never marshal its resources effectively. According to the Equation of Exchange, one of the core principles of classical economics, currencies grow in value as circulation increases; the number of times a currency changes hands is the best predictor of a currency’s long term value, not its high- or low-water mark among currency traders. Assets remain embarrassingly over-concentrated (according to one estimate, less than 300,000 people hold Bitcoin worldwide) which undermine the currency’s chances of reaching a mass audience. The Lamborghini dealerships, porn stars, and electronics retailers who received Bitcoin as a form of payment did not, by and large, turn around and pay that Bitcoin to someone else — they exchanged it for fiat, as soon as they were able.

3. Poor Branding and Marketing. Both online and offline, numerous foundations, conferences, and centers sprang up to evangelize the Bitcoin gospel — but most catered to other techies and investors, not to the general public. Most of the general public associate Bitcoin with criminals. The rest assume it is difficult to use. Where were the celebrity endorsements, the product placements, and the sweepstakes and giveaways that would have gotten Bitcoin into general circulation? Where was even a single, large-scale mass market advertising campaign? The $7B market cap Bitcoin enjoyed one year ago should be seen ss a window of opportunity, not a reason for arrogance.

Yet there is still hope.

The technological innovation that BTC represents cannot be understated. Best of all, the idea percolated far enough into the global media and investor community that the disruptive potential of peer-to-peer currency is now widely understood. Cryptocurrency will be back again.

Whether by Bitcoin or another name, its needs to attract not simply the technological whiz kids but also talented professionals who understand marketing, branding, usability — and fairness.

Tess Gadwa


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