- Ledger security. Prevents data to be changed.
- TXs (UTXOs) + prev hash + nounce ( random number to be guess)= HASH
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- It is important thet the blocks are linked together - to prevent breaking the rules.
It ensures the blocks remain immutable, and making people don’t desire to break a previous block by changing a tx. - It looks like a box with a lot of paper in it.
It contains the previous hash, the tx list and the NONCE
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so that the previous blocks cannot be changed or cancelled. Creates security.
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each block is created of the TX list, the previous hash and the nonce.
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- It is critical that blocks are cryptographically linked together to ensure that it is virtually impossible to alter recorded transactions, which in turn results in a high degree of integrity and security that promotes a “trustless” system.
- Blocks are composed of a list of txs, the previous block’s hash, and the nonce. These are hashed together, and the resulting hash is used for the next block. In this manner, it is the cryptographic hashes that link the blockchain together.
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Why is it important that the blocks are cryptographically linked together? That way previous blocks can’t be changed without messing all the rest up.
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What does the block structure look like in bitcoin? Blocks consists of UTXOs (previous transactions), previous block hash, and nonce.
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- It keeps the blockchain immutable
- each block has the previous blocks hash, nonce, and all the transactions mined. The block is the linked to the next block that is mined.
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- So that it is very difficult to alter or change thus providing a secure and trustless network with integrity.
- Previous Hash + nonce + transaction list + current hash for next block.
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- So that it causes a discrepancy after changing a previous block, as it breaks every link to all the consequent blocks after it, since they are all cryptographically linked together
That way, it is practically impossible to change a previous transaction, as you would have to remine all the subsequent blocks to eliminate the discrepancy - Each block is made up of A hash, which is based off the list of transactions in that block, the hash of the previous block, and the nonce
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1.) Blocks should be cryptographically linked to ensure that you cannot doublespend or go back and change a previous transaction
It is blocks are made with hash from the previous hash, hash from current transacriond and a random number called a nonce
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Homework on Blockchain and Mining Visually - Questions
- Why is it important that the blocks are cryptographically linked together?
for security reasons. - What does the block structure look like in bitcoin?
a block consist of a nonce, data, previous hash and current hash
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1 - To protect from double-spending and so as not to change previous TX.
2 - Hash and nonce that are all connected. If you change 1 letter or number all hash must change.
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Why is it important that the blocks are cryptographically linked together?
To achieve security, transparency and immutability in the Network
What does the block structure look like in bitcoin?
-Number of Block
-Nonce
-Data
-Previous Hash
-Recent Hash
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For control; to ensure security and safety of the Network.
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SHA-256 (DATA) = HASH.
where (DATA) is 1. Transaction List - Tx.
2. Hash from previous block.
3. Nonce.
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1).Why is it important that the blocks are cryptographically linked together?
It is important that blocks are cryptographically linked together to ensure immutability and integrity of blocks, therefore making double spending or any form of sharp practice impossible.
2).What does the block structure look like in bitcoin?
The block structure in bitcoin contains:
(a). the hash of previously mined blocks
(b). A nonce which is a guessed random number
©. the hash of the block in question which is calculated using (a) and a guessed value of (b) which results in a hash that is lesser than a target number which represents difficulty level. And of course
(d). A list of transactions.
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- To ensure that every block has a hash that is a unique signature determined from a combination of the previous block hash, all transactions in the block, and the block nonce.
- Looks like a distributed ledger linked sequentially to one another through the block unique hash.
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- So that the blockchain details cannot be changed in practical terms as it will change the Hash and this affects all hashes after it.
- Block 1 linked cryptographically to Block 2 linked cryptographicall to Block C. Each block has a hash which is generated from the previous hash of the previous block. Within each block are the transactions related to that particular block.
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- It is an issue of the security. If they link cryptographically it is infeasible to change the one of previous blocks.
- The bitcoin block consists of list of TX, i.e addresses of the inputs and outputs
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There are also other metadata, most important is the previous block hash that links the blocks in a chain 
- Why is it important that the blocks are cryptographically linked together?
to ensure that the blocks remain secure so no hacks and manipulate the blockchain - What does the block structure look like in bitcoin?
Nonce
Data
Previous chain
Hash number
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1. Why is it important that the blocks are cryptographically linked together?
Otherwise the miner can go back in the previous block, change a transaction, and cheat the system.
2. What does the block structure look like in bitcoin?
Block 1 (transaction list + hashrate of the previous block + “nonce number” -> new hash)
Block 2 (transaction list + hashrate of the previous block (new hash) + nonce number" + new hash2)
The hash rate links the blocks such as the previous block hashrate is used to guess the “nonce” number in the later block.
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