1). Cryptographically linked blocks are the one of the biggest aspects for security and its immutability. These links make it so nobody can go back and change any of the block data.
2). E). The block structure looks like= block header, block size, previous hash function, transactions from the mempool and the nonce.
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Homework on Blockchain and Mining Visually
1. Why is it important that the blocks are cryptographically linked together?
It is important to keeps blocks linked together to keep the integrity of the network intact. Since every next block is linked to the previous block (by including hash output of the previous block) this enables editing and corrupting the data nearly impossible.
2. What does the block structure look like in bitcoin?
- Transaction data
- Hash of previous block
- nonce
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To prevent any changes
A chain of hashes where the next hash backs up the previous hash.
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Why is it important that the blocks are cryptographically linked together?
Having cryptographically linked blocks allows for an interdependent, mostly-immutable validation system to exist. Because each block is dependent on the previous block’s hash, a change in an older block
would require changes to all blocks thereafter. Furthermore because all blocks are linked via the same cryptography one input leads to the same output, making the blockchain consistent, reliable, and hard to
change. This works well with the incentive structure where the most favorable hash is chosen - this makes changes triple hard to do. -
What does the block structure look like in bitcoin?
The block structure in bitcoin looks like a series of blocks in one long chain. Each separate block is composed of data, a nonce, and hash.
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It is important that blocks are cryptographically linked together for the security of the blockchain. If you tried to change one block, you would have to change all the blocks that followed. e.g. almost impossible.
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The Hash is based on the pervious block, plus the new block TX, plus the nonce which is the guessing portion.
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You have a good grasp on the material 
1 to keep the integrity of the blockchian . change one thing and the whole chain falls apart
2 Previous hash / TX list / Nonce
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Why is it important that the blocks are cryptographically linked together?
keeps the network secure with no censorship, no double-spend, and no altering data/history -
What does the block structure look like in bitcoin?
previous hash, transaction list, and nonce
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1 So that if someone tries to change a prev block to make it harder for him to alter the chain.
2 The block is composed from the hash of the prev. block, nonce and all the TX that are in the current block.
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This ensures that nobody can go back in time and change transactions.
Block structure is previous hash, current transactions plus nonce equals current hash.
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Simply because of security of the blockchain that no one can try to change the transaction, if it does change then it will break the link to the next block.
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[Block number]>[Nonce]>[transaction data]>[Hash of the previous block]>[Hash of the current block].
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- Why is it important that the blocks are cryptographically linked together?
- The blocks are cryptographically to ensure that any changes will effect all subsequent
confirmed data becomes void.
- What does the block structure look like in bitcoin?
- The block structure looks like (previous hash, TX, nonce, and current hash)
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- To prevent the data to be tampered with in a block.
- Previous hash, transaction list, nonce, own hash.
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Why is it important that the blocks are cryptographically linked together? Puzzles based on verified contents which can’t be broken. POW integrity.
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What does the block structure look like in bitcoin? Previous hash, TX list, Nonce
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1.It is important to keep data secure, the link makes data immutable
2.Transaction, hash, prev transaction, nounce
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- To secure the network. Make it difficult to alter a past block, because if something is altered this changes the other transactions after that, which there is little incentive to change.
- previous hash, transaction list and nonce
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- Why is it important that the blocks are cryptographically linked together?
A. To keep the blockchain secure and make it harder to attack the blockchain. - What does the block structure look like in bitcoin?
A. Transactions + previous hash + nonce
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1.it keeps the network honest. It makes sure no one is trying to pull any funny business
2.The hash of the block is based on the transactions in the block plus the previous hash and the nonce that needs to be guessed.
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Why is it important that the blocks are cryptographically linked together?
So that if any info in any of the blocks is changed, every subsequent block is changed. Thee amount of computing power to change all of them would be practically impossible.
So that it makes no sense for miners to try to change the blocks and play unfairly. -
What does the block structure look like in bitcoin?
It looks like a chain of data blocks, they all follow each other in chain, each block has a hash on top which is made from: blocks transactions, hash of the previous block,and noonce number.
Why is it important that the blocks are cryptographically linked together?
Otherwise it would not be possible to go back in time and verify if the transactions are valid or not. This shows that the miner has put in the work and found the right hash. Since what you can spend is based on UTXOs, the network has to be able to go through the entire blockchain and calculate what you can spend. This is only possible if you can always go back from block to block.
What does the block structure look like in bitcoin?