What Is Blockchain Technology? #CBInsights

Few people understand what it is, but Wall Street banks, IT organizations, and consultants are buzzing about blockchain technology. It’s hard to remove blockchain from Bitcoin, so we’ll start with Bitcoin as we work to understand this technology’s potential.
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Tech Investment and Growth Advisory for Series A in the UK, operating in £150k to £5m investment market, working with #SaaS #FinTech #HealthTech #MarketPlaces and #PropTech companies.
Bitcoin Blockchain ledger Blockchain Technology transaction Bitcoin Cash token Alice decentralize
About Techcelerate Ventures

Tech Investment and Growth Advisory for Series A in the UK, operating in £150k to £5m investment market, working with #SaaS #FinTech #HealthTech #MarketPlaces and #PropTech companies.
Bitcoin Blockchain ledger Blockchain Technology transaction Bitcoin Cash token Alice decentralize
I
What Is Blockchain 
Technology?
II
Few people understand what it is, but  
Wall Street banks, IT organizations,  
and consultants are buzzing about  
blockchain technology. It’s hard to remove  
blockchain from Bitcoin, so we’ll start  
with Bitcoin as we work to understand  
this technology’s potential.
Bitcoin. Blockchain technology. Cryptocurrencies. Initial  
coin offerings.
Everyone’s talking about them, but what do these terms  
really mean?
At its peak in January 2018, the total market cap of  
cryptocurrencies surpassed $800B, according to Coin Market  
Cap, while the price of bitcoin hit a high of $19,300 in Dec’17, 
according to Coindesk. Initial coin offerings (ICOs) exploded 
in popularity, surpassing $18B in the first 8 months of 2018. 
Huge corporations — like Walmart and Pfizer — have completed 
successful blockchain pilots, with many more partnering on 
projects ranging from remittance to title transfer.
This explainer will offer simple definitions and analogies for 
blockchain technology. It will also define Bitcoin, Bitcoin Cash, 
Ethereum, Litecoin, blockchain, and initial coin offerings.  
Along the way, we’ll highlight promising use cases for 
blockchain technology.
(For a deep dive into how Ethereum works specifically, you  
can read our What Is Ethereum explainer.)
Lastly, this report will make clear the distinctions between 
distributed ledger technology and blockchain, and highlight 
where these technologies have an application – and where  
they do not.
III
Table of 
Contents
What is Bitcoin?
What is Blockchain?
What is Ethereum?
What is Bitcoin Cash?
What is Litecoin?
The Future of Blockchain Technology
1
9
15
22
23
25
IV
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VI
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CORPORATE STRATEGY, MICROSOFT
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TRUSTED BY THE WORLD’S LEADING COMPANIES
1
The 2008 financial crisis caused a lot of 
people to lose trust in banks as trusted 
third parties. Many questioned whether 
banks were the best guardians of the global 
financial system. Bad investment decisions 
by major banks had proved catastrophic, 
with rippling consequences.
Bitcoin — also proposed in 2008 — presented something of  
an alternative.
According to its whitepaper, Bitcoin is a “peer-to-peer electronic 
cash system” that “allow[s] for online payments to be sent  
directly from one party to another without going through a  
financial institution.”
In other words, Bitcoin made digital transactions possible without 
a “trusted intermediary.” The technology allowed this to happen 
at scale, globally, with cryptography doing what institutions like 
commercial banks, financial regulators, and central banks used to 
do: verify the legitimacy of transactions and safeguard the integrity 
of the underlying asset.
Bitcoin is a decentralized, public ledger. There is no trusted third 
party controlling the ledger. Anyone with bitcoin can participate  
in the network, send and receive bitcoin, and even hold a copy of 
this ledger if they want to. In that sense, the ledger is “trustless” 
and transparent.
The Bitcoin ledger tracks a single asset: bitcoin. (Note: “Bitcoin” 
capitalized refers to the Bitcoin ledger, or protocol, while “bitcoin”  
in lowercase refers to the currency or a unit of account on the 
Bitcoin ledger.)
The ledger has rules encoded into it, one of which states that there 
will only ever be 21M bitcoin produced. Because of this cap on the 
number of bitcoins in circulation, which will eventually be reached, 
bitcoin is inherently resistant to inflation. That means that more 
bitcoin can’t be printed at a whim and reduce the overall value of 
the currency.
What Is 
Bitcoin?
2
All participants must agree to the ledger’s rules in order to use it.
Bitcoin is politically decentralized — no single entity runs bitcoin — 
but centralized from a data standpoint — all participants (nodes) 
agree on the state of the ledger and its rules.
A bitcoin or a transaction can’t be changed, erased, copied, or 
forged – everybody would know.
That’s it, and it’s a big deal.
The Story Of Alice And Bob
To understand better how this peer-to-peer electronic cash 
system allows for online payments to move from one party to 
another without going through a financial institution, let’s use a 
simple example.
Physical Transaction
Here’s a scenario: Alice hands Bob a physical arcade token. 
Bob now has one token, and Alice has zero. The transaction is 
complete. Alice and Bob do not need an intermediary to verify the 
transaction. Alice can’t give Charlie the same token, because she 
no longer has the token to give — she gave it to Bob.
But what if the same transaction were digital? Alice sends Bob a 
digital arcade token — via email, for example. Bob should have the 
digital token, and Alice should not.
Right?
3
Not so fast. What if Alice made copies or “forgeries” of the digital 
token? What if Alice put the same digital token online for all to 
download? After all, a digital token is a string of ones and zeros.
Digital Transaction
If Alice and Bob “own” the same string of ones and zeros, who 
is the true owner of the digital token? If digital assets can be 
reproduced so easily, what stops Alice from trying to “spend” the 
same digital asset twice by also sending it to Charlie?
One answer: use a database — a ledger. This ledger will track a 
single asset: digital arcade tokens. When Alice gives Bob the digital 
token, the ledger records the transaction. Bob has the token, and 
Alice does not.
Now, they face a new problem: whose job will it be to hold the 
ledger? Alice can’t hold it because she might erase the transaction 
and say that she still owns the digital token, even though she 
gave it to Bob. It also can’t be Bob, because he could alter the 
transaction and lie to say that Alice gave him two tokens, doubling 
his arcade time.
Bob and Alice can solve this problem by using a trusted third party, 
an intermediary who is not involved in the transaction at all — let’s 
call him Dave. Dave will hold the ledger and make sure that it’s 
up-to-date.
This situation is fine — until it’s not.
Digital Transaction: Ledger
4
What if Dave decides to charge a fee that neither Alice or Bob 
want to pay? Or, what if Alice bribes Dave to erase her transaction? 
Maybe Dave wants the digital token for himself, and adds a false 
transaction to the ledger in order to embezzle it, saying that Bob 
gave him the token?
In other words — what happens when Alice and Bob cannot trust 
the trusted third party?
Think back to the first physical transaction between Alice and Bob. 
Is there a way to make digital transactions look more like that?
Here’s a thought: Alice and Bob could distribute the ledger to all 
their trusted friends, not just Dave, and decentralize trust. Because 
the ledger is digital, all copies of the ledger could sync together. If 
a simple majority of participants agree that the transaction is valid 
(e.g. confirm that Alice actually owns the token she wants to send), 
it gets added to the ledger.
Decentralized Ledger
 
When a lot of people have a copy of the same ledger, it becomes 
more difficult to cheat. If Alice or Bob wanted to falsify a transac-
tion, they would have to compromise the majority of participants, 
which is much harder than compromising a single participant.
Alice can’t claim that she never sent a digital token to Bob — her 
ledger would not agree with everyone else’s. Bob couldn’t claim 
that Alice gave him two tokens — his ledger would be out of sync. 
And even if Alice bribes Dave to change his copy of the ledger, 
Dave only holds a single copy of the ledger; the majority opinion 
would show the digital token was sent.
5
In sum, this distributed ledger works because everyone is holding a 
copy of the same digital ledger. The more trusted people that hold 
the ledger, the stronger it becomes.
Such a ledger allows Alice to send a digital token to Bob without 
going through Dave. In a sense she is transforming her digital 
transaction into something that looks more like a physical one in 
the real world, where ownership and scarcity of an asset is tangible 
and obvious.
How secure is Bitcoin?
You may have noticed a key difference between the above example 
and Bitcoin. Specifically, Alice’s and Bob’s ledger only allows 
“trusted friends” to participate. In contrast, Bitcoin is entirely public, 
and anyone can participate.
Let’s think about this for a moment. A public ledger would allow for 
many more participants. The more participants, the stronger the 
ledger becomes. Right?
As you may have guessed, it’s not that simple.
Because Bitcoin expands beyond trusted participants and  
gives anyone access, it runs a higher risk of bad actors and  
false transactions.
Sure, we also ran a risk of bad actors when it came to Alice’s and 
Bob’s trusted friends: Dave might turn untrustworthy. However, 
Bitcoin is free and open to anyone, trusted or not, like a Google 
document that anyone can read and write to.
How can we get all these untrusted “nodes” to agree on the state 
of the ledger? How can we avoid bad actors corrupting the ledger?
Bitcoin offers a solution: reward good actors and scare off bad 
ones, a classic carrot and stick act.
In simple terms, certain Bitcoin participants are incentivized to 
do the dirty work and maintain the network. These participants 
— called “miners” — bundle transactions into a “block,” add this 
newest block to the “chain” of prior blocks (hence: blockchain is 
used to describe Bitcoin’s unique database structure), and devote 
immense computational power to the network in the process.  
For doing this work, these miners are rewarded with bitcoin.  
With a single bitcoin worth thousands of dollars, this is a very 
strong incentive.
How can we get all 
these untrusted “nodes” 
to agree on the state 
of the ledger? How can 
we avoid bad actors 
corrupting the ledger?
6
When miners devote computational power, they also use a 
tremendous amount of electricity. So much electricity, in fact, that 
a recent estimate put the Bitcoin blockchain’s total annual energy 
consumption on par with the entire country of Ireland.
This scares away hackers and bad actors because “hacking” 
Bitcoin to get everyone’s coins would cost a tremendous amount 
of computing power, electricity, and money. Further, if the Bitcoin 
community became aware of the hack, it would likely cause 
the price of bitcoin to drop steeply. This makes such an attack 
economically self-defeating.
Understanding a Bitcoin Transaction
HOW BLOCKCHAIN TECHNOLOGY POWERS BITCOIN
 
7
In technical terms, this mining process creates Bitcoin’s 
consensus mechanism, called “Proof of Work.”
This clever game-theoretic model creates a ledger that everyone 
trusts, but nobody controls.
Wait… what is Bitcoin?
OK, let’s connect all the dots:
 » Bitcoin is a decentralized, public ledger. This ledger is known 
as a blockchain. There is no trusted third party controlling the 
Bitcoin blockchain. Instead, anyone can read it, write to it, and 
hold a copy.
 » The Bitcoin blockchain tracks a single asset: bitcoin. The block-
chain has rules, one of which states that there will only ever 
be 21M bitcoin. All participants must agree to Bitcoin’s rules in 
order to use it.
 » Because anyone can read it and write to it, Bitcoin needs a 
method to establish consensus among untrusted nodes — 
unlike Alice’s and Bob’s distributed ledger shared among trusted 
friends. It solves this problem via clever economics:
·
·
Incentive: The first miner to verify transactions and devote 
immense computing power to secure the blockchain can 
append a block of transactions to the chain of previous 
blocks. This miner is rewarded with bitcoin, and the race 
starts over every ten minutes.
·
· Disincentive: Bad actors are dissuaded from attacking 
the blockchain, because it’s effectively a money-losing 
proposition.
What are altcoins?
Since Bitcoin launched in 2008, thousands of other cryptocurrencies 
and altcoins (“alternative coins”) have emerged.
Because Bitcoin’s code is open-source, anyone can use Bitcoin’s 
code to create an altcoin. Many of them seek to improve on Bitcoin 
or expand its capabilities. Remember Bitcoin’s rules: it caps the 
number of bitcoin at 21M and uses the Proof of Work system to 
secure the network. Other cryptocurrencies use different rules and 
engage with other economic models.
8
Is Bitcoin a bubble?
Hard to say. It’s true that the value of one bitcoin has gone from 
around $300 in 2015, to almost $20,000 at its peak in December 
2017, back down to about $6,400 in early September 2018. Even 
with all this volatility, bitcoin is still way up over the long run: if you 
had bought $100 of bitcoin at the end of 2011, it would be worth 
over $200k today.
As discussed, Bitcoin’s blockchain technology allows for the 
creation of a unique and scarce digital asset where everyone knows 
the history of each particular bitcoin. A single bitcoin is not just a 
string of ones and zeros: it’s also the first successful (at least so 
far) censor-proof, portable, easily transactable, durable, and secure 
digital asset.
Bitcoin’s value is subject to the same supply-and-demand 
mechanics found in any marketplace. If investors find the above 
characteristics valuable and demand for bitcoin grows, bitcoin’s 
price rises, and vice versa.
Bitcoin’s supply is limited to 21M coins, although only about 17M 
have been mined so far. As of September 6, 2018, investors value 
bitcoin at about $112B in aggregate.
To give a sense of how the market values other cryptocurrencies, 
here’s some market information about some of the top ones.
Comparing Top Cryptocurrencies
AS OF 9/6/18  
9
A caveat
There’s lots more to Bitcoin that we’re not going to get into. 
Hashes, public-private key encryption, segregated witness, and 
sidechains, among other elements, fall outside of the scope of  
this piece.
What Is Blockchain?
So far, we’ve discussed two types of ledgers.
The first, Alice’s and Bob’s distributed ledger for digital arcade 
tokens, is private.
The second, Bitcoin’s decentralized ledger for bitcoin, is public. 
Anyone can participate. To ensure its public, decentralized ledger 
remains secure, Bitcoin uses a blockchain.
If we were to define “blockchain” as a technology separate from 
Bitcoin, it might look something like this:
Blockchain technology offers a way for untrusted parties to 
reach agreement (consensus) on a common digital history. 
A common digital history is important because digital assets 
and transactions are in theory easily faked and/or duplicated. 
Blockchain technology solves this problem without using a 
trusted intermediary.
Where else might blockchain make 
sense?
The short answer: in unique instances.
To see what those instances might be, let’s think about why 
Bitcoin needs blockchain technology. There are three main 
reasons.
 » Bitcoin is a public ledger of bitcoin transactions
 » There are untrusted nodes recording transactions on the  
Bitcoin ledger
 » Bitcoin does not want to trust a third party to administer  
the ledger
Blockchain
10
Effectively, Bitcoin uses a blockchain to decentralize payments. 
Where else could we use this unique database architecture to get 
rid of the middleman? Are there other things that would be more 
valuable if they were decentralized?
Let’s take this step-by-step. What’s another scenario where 
everyone needs a record of ownership, and where a trusted third 
party isn’t preferred?
A couple of immediate use cases come to mind.
Land title is one. It could be quite useful for everyone to have 
access to a decentralized source of record saying who owns 
a given parcel of land. Considering that coups and wars often 
redistribute land unfairly and/or incorrectly, this could not only 
prove useful: it could also have humanitarian implications. Once a 
land distribution is agreed upon, it can be recorded in a distributed 
ledger and no longer be subject to ongoing debate. A number of 
companies are working on this, including velox.RE.
In the same vein, a blockchain could be used to establish 
ownership over any number of physical assets — cars, art, musical 
instruments, and so on. A paper record of title is prone to forgery 
and/or physical degradation. Centralized databases are prone 
to hacking, human error, and/or tampering. A blockchain means 
there is no single entity controlling the ledger. Therefore, recording 
physical assets on a blockchain is a prime example of where 
the technology might come in handy to track ownership with a 
tamper-proof, neutral, and resilient system.
Taking this one step further, blockchain technology could even 
prove applicable in virtual reality. If a virtual world is created — 
for gaming, or for any number of other reasons — blockchain 
technology could allow users to purchase and own pieces of that 
virtual world, just like they might purchase a plot of land.
That’s certainly a bit far out, but Decentraland is one project 
already working on it. The team raised $25M in August 2017 for its 
token, MANA, and has promised to build “the first virtual platform 
owned by its users.”
Identity might also be low-hanging fruit. The 2017 Equifax  
hack exposed the social security numbers of 143M Americans.  
Social security numbers were never meant to be used for 
identification — notice how this old social security card states  
“not for identification.”
11
 
Blockchain technology might present a better means of  
establishing identity. Instead of a state or government issuing 
it, identity could be verified on an open, global blockchain — 
controlled by nobody and trusted by everybody. Thus, users could 
control their own identity. A number of companies are working in 
this arena, including ID2020 and Civic.
Similarly, Blockstack hopes to build a new decentralized internet, 
“where users own their data and apps run locally.” Technically 
speaking, Blockstack is one of the first examples of a decentralized 
DNS (domain name server) system built using blockchain technology. 
The company raised $52M in December 2017 and hopes that its 
new internet will help users “own [their] data and maintain [their] 
privacy, security, and freedom.” If it works, Blockstack could disrupt 
many of the internet giants that act as middlemen today — think 
Google and Facebook. Of course, that’s a big if.
There are also a wide array of potential decentralized internet 
services, like decentralized advertising. Basic Attention Token has 
recently been gaining ground as a blockchain-based protocol that 
promises to make advertising more efficient by distributing value 
between users, advertisers, and publishers. The project, founded 
by Brendan Eich, the creator of JavaScript and the co-founder 
of Firefox and Mozilla, uses a blockchain-based token in a 
custom-built browser to track and reward focused user attention 
on advertisements while protecting user privacy.
Other potential applications include a platform where 
traditionally illiquid assets are represented and traded through 
blockchain-powered tokens. Imagine a decentralized asset 
market, where you can buy, sell, and trade fractional ownership of 
high-value paintings, real estate, and companies via interoperable 
databases, without any kind of intermediary. That’s the kind 
12
of liquidity that 0x Project is working to make possible with its 
protocol for decentralized asset exchanges.
Of course, the applications for blockchain technology extend well 
beyond these six examples.
Where does distributed ledger 
technology make sense?
Let’s back up for a moment.
We mentioned that Alice’s and Bob’s private implementation — 
where everyone knows and trusts everyone involved — doesn’t 
need a blockchain (nor does it need miners to verify and append 
transactions to the cryptographically-protected blockchain).
Without the blockchain’s verification step, we’re left with a “distrib-
uted ledger,” or a decentralized spreadsheet that is only accessible 
to a select group of trusted parties. Because this ledger is private, it 
doesn’t need the same security measures as the blockchain.
The hype around Bitcoin, blockchain, and cryptocurrencies has 
contributed to renewed interest in distributed ledger technology. This 
is the idea of distributing a database among participants to ensure a 
common record of truth. Bitcoin uses distributed ledger technology 
and adds a consensus layer on top — the blockchain.
Because Alice and Bob’s participants are trusted and their ledger is 
private, Bitcoin’s blockchain isn’t needed. In fact, a blockchain might 
prove unwieldy, slow, and overly complex for Alice and Bob’s ledger, 
for reasons which we’ll address below. Instead, a trusted third party 
could be used to lightly administer a distributed ledger.
Bitcoin and Ethereum (which we’ll dive into below) are considered 
public, “permissionless” blockchains: anyone can access them. 
On the other hand, if all parties are known and trusted, distributed 
ledger technology could provide sufficient security. One example of 
distributed ledger technology is R3’s Corda, which is working with 
major financial services organizations to improve banking processes.
While distributed ledger technology and blockchain technology each 
have their own pros and cons, the important thing to remember here 
is that blockchain technology is not a cure-all. For Bitcoin, a public, 
permissionless blockchain is the only possible solution. In many 
other instances, a blockchain would be a terrible idea.
13
What are the major issues with 
blockchain technology?
Blockchain technology is really good at some things and 
absolutely awful at others.
The three major questions about blockchain technology concern 
its scalability, its anonymity, and its economical viability.
IS BLOCKCHAIN SCALABLE?
For a blockchain to work, lots of participants need to hold 
up-to-date copies. This means that the same database is held by 
thousands of nodes. This is fairly inefficient.
If we were to look at how technology has developed over the past 
fifteen years, blockchain runs counter to the logic behind cloud 
computing. Cloud computing trends toward a single database that 
multiple nodes can access. These nodes don’t have to hold their 
own private copy of this database.
Further, nodes holding copies of the blockchain receive constant 
updates. These nodes are distributed around the world. Because of 
this, blockchains have high latency (latency is the amount of time 
it takes for data to move through the network).
As a result, blockchain technology faces scaling issues. Bitcoin 
can process about 4-5 transactions per second. Ethereum maxes 
out at about 25 transactions per second. Visa can process over 
24,000 transactions per second.
IS BLOCKCHAIN ANONYMOUS?
In the early days of Bitcoin, blockchain technology — like  
many nascent technologies — was popularly associated with  
illicit activities.
Why was blockchain technology like Bitcoin effective for this 
kind of enterprise? Even though Bitcoin’s record of transactions 
is publicly available, the network’s global, decentralized nature 
means that no single entity — like the US government or Visa — 
can shut it down, freeze funds, or reverse transactions. And in 
those early days, it was very hard to link a Bitcoin wallet to a given 
individual, even if there was evidence that the wallet was used in 
illicit activities.
14
One of the reasons why Bitcoin has gained more mainstream 
popularity as a store of value and financial instrument is that 
it’s no longer as anonymous as it was in those early days. Most 
major services that allow you to buy and sell Bitcoin use “know 
your customer” (KYC) standards, and law enforcement agencies 
have gotten more adept at linking Bitcoin transactions to specific 
people. There are other projects that have emerged in an effort to 
use blockchain technology to protect user anonymity (e.g. Monero 
and ZCash), but these are significantly less mainstream.
IS BLOCKCHAIN ECONOMICAL?
One of the keys to blockchain technology being viable in the 
long-run is making sure that transactions like Alice and Bob’s can 
be executed with minimal fees. Fees are important because they 
incentivize miners to add your transactions to the blockchain in a 
timely manner — but high fees make it harder to convince potential 
users to get on board.
In December 2017, the median transaction fee on the Bitcoin 
network peaked at $34 per transaction. Companies like Stripe and 
Valve announced they would no longer accept Bitcoin payments 
due to high fees.
Today, the median transaction size on the Bitcoin network is about 
$300, while the median transaction fee wavers around $0.10 — 
that’s a 0.03% median transaction fee, much better than the 0.7% 
fees of its peak.
Though the fees have come down, Bitcoin is still not capable of 
everyday commerce — the platform would have to solve issues 
with scaling, transaction block time, and more before it’s ready for 
the big leagues.
15
What is Ethereum?
We asked earlier what other applications could be built with 
blockchain technology.
Recall that Bitcoin is, effectively, a decentralized application for 
payments. Ethereum adds another layer by allowing users to put 
code on its blockchain that executes automatically. This code is 
called a “smart contract.” In this way, Ethereum hopes to create a 
decentralized computing platform — a global supercomputer.
What is a smart contract?
To illustrate a smart contract, let’s say Alice and Bob enter into  
a bet.
Alice thinks that the temperature tomorrow morning will reach 70 
degrees. Bob thinks that it will stay lower. They wager 10 bitcoin on 
the outcome. If Alice and Bob don’t trust each other, they will have 
to use a trusted third party as an escrow agent. In other words, 
they will each have to give the agent that amount of bitcoin, and 
the agent will distribute the winnings and the amount staked to  
the winner.
There’s no way around the middleman in this scenario, even  
using bitcoin.
Ethereum, though, offers a decentralized solution. Alice and Bob 
could agree to use some basic code — a contract of sorts — to 
alert the system to what the temperature ended up being and pay 
out based on who was correct. If the temperature goes higher  
than 70 degrees, the code pays Alice, otherwise, it pays Bob.  
Alice and Bob could then place this code (their bet) on  
Ethereum’s blockchain.
This looks like a “contract,” because all participants in the 
Ethereum blockchain hold a copy of this agreement. Just like  
the Bitcoin blockchain knows that Alice sent Bob a bitcoin  
(in our example above), the Ethereum blockchain knows that  
Alice and Bob have entered into an agreement. Therefore, this 
contract is self-enforcing.
Smart contracts like these are what make Ethereum so compelling. 
Because Ethereum is a blockchain, it’s very hard to attack, 
change, or forge these smart contracts, just like it’s economically 
self-defeating to attack Bitcoin.
Ethereum
16
So, what is Ethereum?
A smart contract allowed Alice and Bob to build a very small 
decentralized application. What if we could build larger and more 
complex decentralized applications?
Ethereum wants to be the platform on which these decentralized 
applications are built.
Recall that Bitcoin is a very simple decentralized application, for 
payments. Ethereum builds on Bitcoin by incorporating robust 
computing capabilities and smart contracts. In simple terms, 
this means that developers can use more complex code to build 
decentralized applications on top of Ethereum. These apps would 
be less error prone, more neutral, and more transparent. They 
would have lower administrative costs and greater built-in security.
Let’s unpack this:
 » Ethereum allows participants to execute code on its ledger, 
including “smart contracts.” Coupled with its ability to  
incorporate complex code, Ethereum hopes to be a massive 
decentralized computer.
 » In the same way that Bitcoin uses a blockchain to track  
bitcoin, Ethereum uses a blockchain to track a cryptocurrency 
called “ether.” Users spend ether to run programs on  
the Ethereum supercomputer.
 » Because Ethereum is decentralized, once a program is uploaded 
it can’t be shut down by any sort of centralized actor. Just like 
Bitcoin, there is no central point of attack.
 » Therefore, Ethereum is also a construction set for building 
decentralized applications. Instead of building their own blockchains 
from scratch, developers can use Ethereum’s blockchain.
17
Here are some decentralized applications attacking different 
verticals. Many of these are building on top of Ethereum:
134 blockchain startups with ICOs
CLOSED INITIAL COIN OFFERINGS GREATER THAN OR EQUAL 
TO $500K. 2014 – 2017 (09/08/2017)
 
18
Why does Ethereum matter?
In August 2016, then-Union Square Ventures investor Joel 
Monegro published a blog post entitled “Fat Protocols.” In it, he 
examines the protocols or systems on which our modern internet 
has been built:
“The previous generation of shared protocols (TCP/IP, HTTP, SMTP, 
etc.) produced immeasurable amounts of value, but most of it got 
captured and re-aggregated on top at the applications layer, largely 
in the form of data (think Google, Facebook, and so on).”
In other words, the internet as we know it works because of TCP/
IP, HTTP, and SMTP, among others. These protocols are often 
open-source and maintained by devoted developers.
If the entire internet relies on these protocols, one would expect 
these protocols to extract value (read: make money). However, 
that hasn’t happened. Instead, the applications built on top of 
these protocols have made all the money. Google, Facebook, and 
Amazon can’t exist without TCP/IP, but they have captured all the 
value, while TCP/IP has not.
By effectively creating a decentralized supercomputer, Ethereum 
acts as a base layer for decentralized applications. Ethereum’s 
built-in cryptocurrency, ether, can be traded on exchanges for 
dollars or other government-backed currency — just like bitcoin. 
Therefore, the value of this supercomputer can be captured at the 
protocol layer.
Why is the price of Ethereum so high?
Ethereum’s blockchain allows for the creation of a decentralized 
supercomputer. This supercomputer is the first one of its kind.
Computational power is limited, and developers pay with ether to 
use the Ethereum blockchain. Users also buy and spend ether to 
interact with its various decentralized applications. For example, 
CryptoKitties is a popular app built on top of the Ethereum 
blockchain that allows individuals to buy collectible cartoon cats. 
In order to purchase a CryptoKitty, you have to use ether.
Ether’s dollar value is subject to supply-and-demand — if investors 
find the Ethereum blockchain valuable, and developers are building 
valuable decentralized applications on top of the platform that 
require the use of ether, then demand might rise and the price of 
ether could rise. The opposite can also happen.
19
As more and more applications are built on Ethereum, the demand 
for ether has gone up, driving up the price of the token. However, 
the price of the coin has fallen nearly 85% since its peak.
What are initial coin offerings?
We’ve now discussed Bitcoin and Ethereum. Both blockchains use 
a “token” that provides utility. Bitcoin uses bitcoin, while Ethereum 
uses ether.
Remember how we mentioned other decentralized applications? 
An initial coin offering is a way for these applications to raise 
money. Instead of going the traditional venture capital route, a 
team could announce that — just like bitcoin or ether — it’s issuing 
a token.
That token might do any number of things. Most of the time, it 
provides some sort of access to the decentralized application, 
in the same way that bitcoin provides access to the Bitcoin 
blockchain (like if you want to send a payment across the globe).
If a team issued a token for a decentralized social media platform, 
the team could mandate that a user needs to hold a token to 
access the platform. If demand for the platform goes up, then the 
token might rise in value.
So, an ICO is simply:
 » The sale of tokens by a blockchain company looking  
to raise funds.
 » These tokens are often subsequently traded on  
cryptocurrency exchanges.
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Investors in ICOs hope to turn a profit by buying early access to 
potentially foundational decentralized applications, just as early 
investors into bitcoin and ether did.
What’s An ICO?
 
Why are ICOs so controversial?
Initial coin offerings could represent a big shift in how companies 
raise money and/or incentivize various stakeholders (e.g., 
developers, investors, users).
At the same time, ICOs are on shaky regulatory footing — in recent 
months, the SEC has become increasingly interested in highlight-
ing misinformation about ICOs, and many have come under fire for 
a lack of transparency, no viable product, or even fraud.
If the SEC or other regulators ultimately rule that a given token is 
a security, then many of the teams behind these ICOs could be 
guilty of illegal securities offerings. The Howey Test, created by the 
Supreme Court in the 1940s to determine if certain transactions 
were classified as securities, is also commonly applied to ICOs.
According to this test, a transaction constitutes the purchase of a 
security if it satisfies the following four conditions:
 » The transaction is an investment of money (or comparable 
financial instruments)
 » The investment is entered into with an expectation of profit
 » The investment of money (or comparable financial instruments) 
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is in a common enterprise
 » Profit comes from the work of a third party or promoter
In February, 2018, SEC Chairman Jay Clayton said, “I want to 
go back to separating ICOs and cryptocurrencies. ICOs that are 
securities offerings, we should regulate them like we regulate 
securities offerings. End of story.” At around the same time, the 
SEC subpoenaed a number of cryptocurrency hedge funds and 
organizations that held ICOs. You can read more about regulatory 
concerns here.
What are utility tokens?
Teams holding ICOs are adamant that they do not represent 
securities offerings and instead market their coins or tokens as 
part of an entirely new asset class altogether.
Again, let’s use Bitcoin to illustrate.
Bitcoin is a token that provides ownership of a unit of account 
on the Bitcoin ledger. It is impossible to participate in the Bitcoin 
ledger without owning bitcoins; bitcoins are the network’s 
exclusive means of exchange. In this sense, bitcoin isn’t a security, 
but rather utility within a network. When teams call their tokens a 
“utility token” or “utility coin” to verbally distance themselves from 
securities law, this is what they’re referencing.
However, many of these teams have yet to build functional 
networks for which their tokens would provide utility. Teams  
often present a whitepaper in lieu of an investment memorandum, 
product, or roadmap, and ICOs regularly raise upwards of $10M, 
stoking concerns of overcapitalization. Many of these companies 
could run the risk of mismanagement after receiving such  
large sums.
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What is Bitcoin Cash?
Bitcoin Cash is not the same thing as Bitcoin, although it shares 
much of its history with that protocol.
Bitcoin Cash is a new network that “forked” from the Bitcoin 
network at the beginning of August 2017. In the blockchain space, 
a “fork” is what happens when developers in the network decide to 
materially change the code of the platform. Nodes, run by miners, 
can update to the new code — if enough nodes make the switch, it 
can become a completely new platform with its own token.
When a significant number of nodes running a protocol like Bitcoin 
agree to update to a new and significantly different software, it 
creates a new blockchain that (1) has the same history as the 
previous protocol leading up to the fork but (2) has a different 
history than the previous protocol following the fork.
Last year, a group of developers came to an agreement that the 
Bitcoin protocol was straying from what they saw as its primary 
function: serving as a ubiquitous, low-fee, fast-execution, peer-to-
peer means of transferring value. They decided to fork Bitcoin in 
order to create a new cryptocurrency, Bitcoin Cash, that would be 
solely focused on serving as that kind of value transfer.
Why is Bitcoin Cash controversial?
Supporters of Bitcoin Cash and Bitcoin commonly spar over the 
functionality of the two coins.
While Bitcoin supporters identify the original blockchain as the 
“true” Bitcoin protocol and dismiss Bitcoin Cash, supporters of 
Bitcoin Cash claim that their protocol does a better job of fulfilling 
Bitcoin’s initial goal of being peer-to-peer cash.
Why all the bad blood? There’s a number of possible explanations, 
but a particularly promising one is about ensuring the long-term 
viability of the crypto sector.
When the Bitcoin community fragments and pulls users away from 
the main protocol with other blockchains (like Bitcoin Cash), some 
feel that it threatens the united front — in other words, a fractured 
space will make it more difficult for widespread adoption.
Bitcoin Cash
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Why is Bitcoin Cash valuable?
Controversy aside, is the value proposition of Bitcoin Cash a sound 
one? Like the crypto sector at large, the price is highly volatile 
— the price of BCH has gone from ~$500 to a peak of just over 
$4,000 in late December 2017, before returning to the same ~$500 
levels in September 2018.
Because Bitcoin Cash is focused on a single function — ubiquitous, 
low-fee, fast-execution, peer-to-peer value transfer — it could be 
valuable if merchants accept it as a form of value transfer, and 
consumers use it as such.
Bitcoin Cash has progressively been accepted by more merchants 
since its fork from Bitcoin. Recently, the thousands of merchants 
that use BitPay were given the option to accept Bitcoin Cash. 
More broadly, the Accept Bitcoin Cash Initiative tracks merchants, 
by industry, who accept Bitcoin Cash (as of 9/6/18, only 750 
merchants accept the token as payment).
On the other hand, the number of transactions of the Bitcoin Cash 
network have been almost uniformly an order of magnitude less 
than the number of transactions on the Bitcoin network — in the 
past few months, Bitcoin has averaged around 200k transactions 
per day, whereas Bitcoin Cash has averaged around 20k.
What is Litecoin?
Another altcoin that’s gradually entered the popular vernacular 
is Litecoin. It was invented in 2011 by former Google engineer 
Charlie Lee to act as cheaper and faster version of Bitcoin. It’s a 
lower-priced cryptocurrency that’s almost identical to Bitcoin — 
there are just a few minor tweaks that are intended to make it a 
more fitting tool for daily commerce.
In May 2017, Litecoin was listed on Coinbase, where Lee was 
a head engineer. It instantly became the fourth most valuable 
cryptocurrency in the world, and prices jumped 25% overnight.
Litecoin
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Litecoin vs. Bitcoin: what’s the 
difference?
Litecoin has an intended function that’s identical to Bitcoin Cash, 
but with a different origin story. Both of these cryptocurrencies 
are designed for small, daily transactions, but Bitcoin Cash forked 
from Bitcoin while Litecoin was early spinoff that never relied on 
the Bitcoin blockchain — which probably explains why it isn’t  
as controversial.
There are a couple of key differences between Litecoin and Bitcoin:
Litecoin has a different “hashing algorithm” than Bitcoin. This 
basically means that the kind of computational process that 
miners use to add new blocks in the blockchain is different.
The upshot of this is that there are fewer highly specialized 
Litecoin mining pools than there are Bitcoin mining pools, making 
it more accessible for the population at large to mine (although 
specialized Litecoin-mining computers are now on the rise).
Litecoin is faster than Bitcoin. The altcoin adds new blocks 
added to its blockchain roughly every 2.5 minutes, in contrast to 
Bitcoin’s 10 minute block frequency. In practice, this means that 
transactions can be confirmed more quickly on Litecoin than  
on Bitcoin.
Why is Litecoin valuable?
Compared to Bitcoin Cash, Litecoin has historically had slightly 
more transaction volume, but, like Bitcoin Cash, Litecoin is still an 
order of magnitude off from Bitcoin transaction volume.
Take a look at this chart to get a sense of how the three have 
stacked up in the last 13 months:
Daily transaction volume of Bitcoin (blue), Litecoin (orange), and Bitcoin Cash (red).
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Worth noting, however, is the fact that Charlie Lee, the founder of 
Litecoin himself, sold all of his holdings in December 2017 due to a 
“conflict of interest.”
As we’ve highlighted, blockchain is still in its nascent stages. 
However, blockchain technology promises various applications in 
money, middlemen, and trust.
The future of blockchain technology
Ultimately, blockchain is as much a political and economic 
hypothesis as a technological one. Blockchain technology provides 
a new way to think about how we agree on things. For the first 
time, multiple untrusted parties can create and agree on a single 
source of truth, without the use of a middleman. The technology’s 
implications for traditional middlemen and corporate players are 
therefore potentially enormous.
As the landscape evolves, the future of blockchain will likely take 
on forms yet to be imagined.
The future