Many people think of blockchain
as the technology that powers bitcoin.
While this was its original purpose,
blockchain is capable of so much more.
Despite the sound of the word,
there's not just one blockchain.
Blockchain is shorthand for a whole suite of distributed ledger technologies
that can be programmed to record and track anything of value,
from financial transactions
to medical records
or even land titles.
You might be thinking:
we already have processes in place to track data.
What's so special about blockchain?
Let's break down the reasons why blockchain technology
stands to revolutionize the way we interact with each other.
Reason number one: the way it tracks and stores data.
Blockchain stores information in batches, called blocks,
that are linked together in a chronological fashion to form a continuous line:
metaphorically, a chain of blocks.
If you make a change to the information recorded in a particular block,
you don't rewrite it.
Instead the change is stored in a new block
showing that x changed to y at a particular date and time.
Sound familiar?
That's because blockchain is based on the centuries-old method of the general financial ledger.
It's a non-destructive way to track data changes over time.
Here's one example.
Let's say there was a dispute
between Anne and her brother Steve
over who owns a piece of land that's been in the family for years.
Because blockchain technology uses the ledger method,
there is an entry in the ledger
showing that Adam first owned the property in 1900.
When Adam sold the property to Dave in 1930,
a new entry was made in the ledger, and so on.
Every change of ownership of this property
is represented by a new entry in the ledger,
right up until Anne bought it from their father in 2007.
Anne is the current owner
and we can see that history in the ledger.
Now, here's where things get really interesting.
Unlike the age-old ledger method –
originally a book,
then a database file stored on a single system –
blockchain was designed to be decentralized
and distributed across a large network of computers.
This decentralizing of information
reduces the ability for data tampering
and brings us to the second factor
that makes blockchain unique:
it creates trust in the data.
Before a block can be added to the chain,
a few things have to happen.
First, a cryptographic puzzle must to be solved,
thus creating the block.
The computer that solves the puzzle
shares the solution to all of the other computers on the network,
this is called proof-of-work.
The network will then verify this proof-of-work and,
if correct, the block will be added to the chain.
The combination of these complex math puzzles
and verification by many computers
ensures that we can trust each and every block on the chain.
Because the network does the trust building for us,
we now have the opportunity
to interact directly with our data in real-time.
And that brings us to the third reason blockchain technology is such a game changer:
no more intermediaries.
Currently, when doing business with one another,
we don't show the other person our financial or business records.
Instead, we rely on trusted intermediaries,
such as a bank or lawyer,
to view our records, and keep that information confidential.
These intermediaries build trust between the parties
and are able to verify, for example,
that "Yes, Anne is the rightful owner of this land".
This approach limits exposure and risk,
but also adds another step to the exchange,
which means more time and money spent.
If Anne's land title information was stored in a blockchain,
she could cut out the middleman,
her lawyer,
who would ordinarily confirm her information with Steve.
As we now know, all blocks added to the chain
have been verified to be true and can't be tampered with,
so Anne can simply show Steve her land title information
secured on the blockchain.
Anne would save considerable time and money by cutting out the middleman
This type of trusted peer-to-peer interaction with our data
can revolutionize the way we access,
verify and transact with one another.
And because blockchain is a type of technology,
and not a single network,
it can be implemented in many different ways.
Some blockchains can be completely public
and open to everyone to view and access.
Others can be closed to a select group of authorized users –
such as your company, a group of banks or government agencies.
And there are hybrid public–private blockchains too.
In some, those with private access can see all the data,
while the public can see only selections.
In others, everyone can see all the data,
but only some people have access to add new data.
A government, for example,
could use a hybrid system to record the boundaries of Anne's property
and the fact that she owns it,
while keeping her personal information private.
Or it could allow everyone to view property records
but reserve to itself the exclusive right to update them.
It is the combination of all these factors –
de-centralizing of the data,
building trust in the data
and allowing us to interact directly
with one another and the data –
that gives blockchain technology the potential to underpin
many of the ways we interact with one another.
But, much like the rise of the internet,
this technology will bring with it all kinds of complex policy questions
around governance, international law, security, and economics.
Here at the Centre for International Governance Innovation,
we seek to bring trusted research that will equip
policy makers with the information they need
to advance blockchain innovations,
enabling economies to flourish in this new digital economy.
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