File1, 2, & 3 for efaik:


File1:

Blockchain- A system in which a record of transactions made in bitcoin or
another cryptocurrency are maintained across several computers that are
linked in a peer-to-peer network.

Crypto-Currency- A digital asset designed to work as a medium of exchange
that uses strong cryptography to secure financial transactions, control the
creation of additional units, and verify the transfer of assets.

Bitcoin (BTC) - A cryptocurrency. It is a decentralized digital currency
without a central bank or single administrator that can be sent from user
to user on the peer-to-peer bitcoin network without the need for
intermediaries. Bitcoins are limited. The total amount of bitcoins that can
ever exist is 21 million.

source: chartaddictsfx.com


File2:

If you have been following banking, investing, or cryptocurrency over the
last ten years, you may be familiar with "blockchain," the record-keeping
technology behind the Bitcoin network. And there's a good chance that it
only makes so much sense. In trying to learn more about blockchain, you've
probably encountered a definition like this: "blockchain is a distributed,
decentralized, public ledge."

Blocks store information about transactions like the date, time and dollar
amount of your most recent purchase from Amazon. (NOTE: This Amazon example
is for illustrative purchases; Amazon retail does not work on a blockchain
principle as of this writing).

Blocks store information about who is participating in transactions. A
block for your splurge purchase from Amazon would record your name along
with Amazon.com, Inc. Insted of using your actual name, your purchase is
recorded without any identifying information using a unique "digital
signature," sort of like a username.

Blocks store information that distinguishes them from other blocks. Much
like you and I have names to distinguish us from one another, each block
stores a unique code called a "hash" that allows us to tell it apart from
every other blcok. Hashes are cryptographic codes created by special
algorithems. Let's say you made your splurge purchse on Amazon, but while
it's in transit, you decide you just can't resist and need a second one.
Even though the details of your new transaction would look nearly identical
to your earlier purchase, we can still tell the blocks apart because of
their unique codes.

source: investopedia.com

File3:

Blockchain's greatest characteristic stems from the fact that its
transaction ledger for public addresses is open to viewing. In financial
systems and businesses, this adds an unprecedented layer of accountability,
holding each sector of the business responsible to act with integrity
towards the company's growth, its community and customers.
Due to its decentralized nature, Blockchain removes the need for middlemen
in many processes for fields such as payments and real estate. In
comparison to traditional financial services, blockchain facilitates faster
transactions by allowing P2P cross-border transfers with a digital
currency. Property management processes are made more efficient with a
unified system of ownership records, and smart contracts that would
automate tenant-landlord agreements.

Blockchain is far more secure than other record keeping systems because
each new transaction is encrypted and linked to the previous transaction.
Blockchain, as the name suggests, is formed by a network of computers
coming together to confirm a 'block', this block is then added to a ledge,
which forms a 'chain'. Blockchain is formed by a complicated string of
mathematical numbers and is impossible to be altered once formed. This
immutable and incorruptible nature of blockchain makes is safe from
falsified information and hacks. It's decentralized nature also gives it a
unique quality of being 'trustless' - meaning that parties do not need
trust to transact safely.

source: forbes.com

No lines are longer than 80 characters, TYVM. Other specified properties aren't being scored automatically at this time so this is not necessarily good news...