Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#3557

1. Why is it important that the blocks are cryptographically linked together?
Blocks are linked together, so previous blocks can’t be changed.

2. What does the block structure look like in bitcoin?
The block structure of Bitcoin is a chain of linked blocks where each block depends on the previous block.

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#3558

The blocks have to be linked because the transactions from each block are linked together. The slightest change will alter the blocks before and after it.

Data transactions, previous hash function, nounce and the new hash.

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#3559
  1. Why is it important that the blocks are cryptographically linked together?
  2. What does the block structure look like in bitcoin?

1 - When they are linked together and if any data in a block the output will change (changed hash) and the links to the following blocks will be broken. This prevents all fraudulent activities such as double spending.
2 - The block structure is the previous hash + the TX list + a nonce.

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#3560

  1. For the security of the network to ensure that TX can’t be changed.

  2. When a new block is being formed it takes the hash of the previous block with TX from the mempool and a nounce. At this point, a miner is guessing a bunch of random numbers in order to get a hash that is lower in value compared to the target number of the network.

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#3561

1. Why is it important that the blocks are cryptographically linked together?
It is important to cryptographically link blocks together in order to secure the blockchain and insure data integrity.

2. What does the block structure look like in bitcoin (BTC)?
The BTC block structure consists of the following elements:

  • Block number (Index)
  • Timestamp
  • Block’s Hash
  • Transactions of the current block
  • The hash of previous block
  • A random number, called “nonce”, that miners have to find
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#3562

#1 So you cant double spend or create money out of thin air, secures the chain.

#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. Contains Data, Nonce and Hash.

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#3563
  1. Why is it important that the blocks are cryptographically linked together?
    So that all previous transactions are verified as being the correct ones and therefore no one can change any of the transactions for their own benefit
  2. What does the block structure look like in bitcoin?
    A block is a group of transactions that have been verified by a miner and which is linked to a previous block with a hash code which can be verified as correct. All blocks are verified in this way apart from the first which has a hash code of zeroes.
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#3564

1. Why is it important that the blocks are cryptographically linked together?
It provides security where nobody can change the past, as it will change data in all future blocks.

2. What does the block structure look like in bitcoin?
Previous Hash, Transaction List, Nonce.

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#3565

  1. because if its linked together its harder of not impossible to duplicate for double spending or fraud (the block has previous chain data) the chain has data from previous block ots all connected so if you try to change anything you will have to redo and try to catch up with the original blockchain.

nonce
Data
New Hash#
Previous hash#

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#3566
  1. This criptographic link makes blocks more protected against changes.
  2. Hash of the previous block, transactions, nounce, block hash
    Magic no., Blocksize, Blockheader, Transaction counter, Transactions
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#3567

Why is it important that the blocks are cryptographically linked together?
It is important in order to prevent double spending. It also makes the blockchain immutable.

What does the block structure look like in bitcoin?
Hast of previous block + transaction of current block + nounce (have to be guessed)

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#3568
  1. Why is it important that the blocks are cryptographically linked together?

It important that the blocks are cryptographically linked together in order to make it impossible to alter any transactions. It provides integrity and immutability.

  1. What does the block structure look like in bitcoin?

Each block is linked together and consists of a current hash, a previous hash, current transactions, and a nonce.

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#3569

  1. Why is it important that the blocks are cryptographically linked together?to ensure it is impossible to change the information on any block

  2. What does the block structure look like in bitcoin? previews hash nonce trx current block hash

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#3570

  1. For the security. Because they linked together, if you change the hash of 1 block , all block gonna be altered. That mean they all gonna have to be remined and its gonna cost lot of money and time.

  2. Transactions, previous hash, nonce.

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#3571
  1. Why is it important that the blocks are cryptographically linked together?
    It is for the higher security of blockchain. As the blocks depend on each other it becomes difficult to change one block and then to change all other blocks that follow.
  2. What does the block structure look like in bitcoin?
    The hash is based on the transactions of the block, previous hash, and the nonce that has to be guessed.
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#3572
  1. Why is it important that the blocks are cryptographically linked together?
  2. What does the block structure look like in bitcoin?

1.they are linked because you can not change the previous hashes meaning transaction
2. list of TXs, previous hash and the nonce

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#3573
  1. Why is it important that the blocks are cryptographically linked together?

That way no transactions can be changed in previous blocks because it would break the link to the next block and all that follow. That enforces integrity across the chain.

  1. What does the block structure look like in bitcoin?

Block = previous hash + transactions + nonuce + new hash

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#3574

  1. Maintains network integrity. All blocks linked together means all blocked verified together. No one can go in and change a single block without changing every block

  2. block #, Nonce, transactions, previous block hash, current block hash

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#3575

1. Why is it important that the blocks are cryptographically linked together?:

Because it wards against any sort of data tampering/alteration. A change in block A will lead to changes in block B,C,D, E,…

2. What does the block structure look like in bitcoin?

A.The hash of the previous block

B.List of transactions

C.Nonce

The above elements are used to calculate its hash which has to be below a target number.

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#3576

  1. Why is it important that the blocks are cryptographically linked together?
    For securing the network to avoid double spending.Blocks rely on one another for transactions done b

  2. What does the block structure look like in bitcoin?
    It has previous hash,transaction list and nonce(random number)

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