Search for notes by fellow students, in your own course and all over the country.
Browse our notes for titles which look like what you need, you can preview any of the notes via a sample of the contents. After you're happy these are the notes you're after simply pop them into your shopping cart.
Title: A BLOCKCHAIN AND HOW IT WORKS
Description: The technology at the heart of bitcoin and other virtual currencies, blockchain is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. The ledger itself can also be programmed to trigger transactions automatically.
Description: The technology at the heart of bitcoin and other virtual currencies, blockchain is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. The ledger itself can also be programmed to trigger transactions automatically.
Document Preview
Extracts from the notes are below, to see the PDF you'll receive please use the links above
UNDERSTANDING A BLOCKCHAIN
A blockchain is a chain of blocks that contains information
...
However, it was
mostly unused until 2009 when Satoshi Nakamoto adopted it to create the digital
cryptocurrency Bitcoin
...
They have an
interesting property: once some data has been recorded inside a blockchain, it becomes very
difficult to change
...
The
data that is stored inside a block depends on the type of blockchain
...
A block also has a hash
...
It identifies a block and all
its contents and it's always unique, just as a fingerprint
...
Changing something inside the block will cause the hash to change
...
If the fingerprint of a block
changes, it no longer is the same block
...
This effectively creates
a chain of blocks and it’s this technique that makes a blockchain secure
...
It is thus called the
“genesis block”
https://www
...
eu/2018/11/16/the-use-and-benefits-of-blockchain-technology-insupporting-childrescue/
Using hashes is not enough to prevent tampering
...
You could effectively tamper with a
block and recalculate all the hashes of other blocks to make your blockchain valid again
...
” It's a mechanism that
slows down the creation of new blocks
...
This mechanism makes it hard to tamper with the blocks, because if you tamper with one
block, you'll need to recalculate the proof-of-work for all the following blocks
...
Blockchains further secure themselves by being distributed
...
When someone joins this network, he/she gets the full copy of the blockchain
...
When someone creates a new block, that
new block is sent to everyone on the network
...
If everything checks out, each node adds this block to their
own blockchain
...
To successfully tamper with a blockchain you'll need to tamper with all blocks on the chain,
redo the proof-of-work for each block and take control of more than 50% of the peer-to-peer
network
...
A task that
is almost impossible
...
One of the more recent developments is the
creation of smart contracts
...
https://blockruption
Title: A BLOCKCHAIN AND HOW IT WORKS
Description: The technology at the heart of bitcoin and other virtual currencies, blockchain is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. The ledger itself can also be programmed to trigger transactions automatically.
Description: The technology at the heart of bitcoin and other virtual currencies, blockchain is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. The ledger itself can also be programmed to trigger transactions automatically.