Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#1727

  1. Why is it important that the blocks are cryptographically linked together?
    In order to secure the data.

  2. What does the block structure look like in bitcoin?
    It resembles a chain of blocks connected in series.

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#1728

  1. It is important because of security. Block’s Hash is used to link them to the next block. Any change in data in previous block will change the hash of changed block and the link will no longer be valid and dismissed by the network.

  2. Block consists of:

  • Data
  • previous Hash
  • Hash
  • Index
  • Timestamp
  • Nounce
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#1729

  1. So that we know that previous blocks have not been modified. It also formes a sequence of transactions as utxo’s from the previous block are used in the new block.

  2. a chain or linked list where the previous blocks hash is used in the calculation of the current blocks hash.

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#1730
  1. Why is it important that the blocks are cryptographically linked together?
    You cannot alter previous transaction as it changes all subsequent blocks. It makes the chain more secure and ensures integrity.
  2. What does the block structure look like in bitcoin?
    Previous Hash, transactions and nonce. These are used to generate the hash of current block.
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#1731

  1. Secures the transactions, immutables them and like that they can’t be double spended or removed

  2. Hash, previous hash, Transaction list, Nonce, Target number

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#1732

1.) So that the network will be secured and that there will no instances of Double Spend and that their will be a full integrity for the blockchain network.

2.) the structure involves the following:

  • the hash of the current block
  • the hash of the previous block
  • the transactions
  • the nonce that needs to be guessed
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#1733

How about the structure of an individual block? :slight_smile:

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#1734

I misread the question).
An individual block comprises a hash of previous block, a nonce (random generated number) and hash of transactions included in the block.

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#1735

1: So that no one can change the content of a previous block.

2: The block contains, previous hash, nonce, data from input/output, fees/mining reward and the new hash for this block.

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#1736

  1. Why is it important that the blocks are cryptographically linked together?
    A cryptographically linked block chain ensures that it would take enormous compute power to modify the chain. The linking provides immutability of the data contained within the block chain.

  2. What does the block structure look like in bitcoin?
    The block structure of bitcoin contains a hash of the previous block, the transaction list and a nonce which meets the mining difficulty requirements.

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#1737
  1. It provides the security and immutability of the blockchain.
  2. Each block comprises: Hash of the previous block, TX data, the Nonce and the Hash of the block
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#1738

1)Because when someone wants to add a new block - they need to solve the cryptography puzzle based on the previous block contents and links. This provides integrity and secures the network.
2) Block structure in bitcoin is based on the transaction list in that block plus the hash of the previous block, and the nonce the miner needs to guess and hash until it is less than the target

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#1739

1- It’s important that blocks are cryptographically linked because it insures the integrity of the blocks in the blockchain by math and makes them immutable. No previous blocks can be changed without breaking the links.

2- The block structure in bitcoin looks like this:
(previous hash, transaction list, nonce) = hash less than target

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#1740

  1. Immutability. This way no one can go back in time and change anything in a previous block.

  2. It contains previous hash, transaction list, and nonce.

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#1741
  1. Because it makes difficult to change a block, so that things like double spending doesn’t happen.
  2. It contains with the previous hash, a list of transactions, the nonce, and current hash.
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#1742
  1. Why is it important that the blocks are cryptographically linked together?

A. If each block is encrypted with a unique hash and each block is linked to the hash of the previous block, then any unauthorized change to information would break the links of the chain.

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

A. The block structure is a linked chain of encrypted data with each block containing the block number, the nonce number, all data and transactions, the hash of this block and the hash of the previous block.

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#1743
  1. When blocks are cryptographically linked together they have immutability. That means it is difficult to change one block without changing the others. This increases the security of the blockchain.
  2. Input; hash of previous block; current target (nonce)
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#1744
  1. Its important so that way we can see whats changed and so we have transaction history
    2A block is made up of the nonce, previous hashes and transactions
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#1745
  1. Why is it important that the blocks are cryptographically linked together?
    -The fact that all the blocks are cryptographically linked together makes it practically impossible to go back and change anything in the blockchain.
  2. What does the block structure look like in bitcoin?
#1746
  1. Why is it important that the blocks are cryptographically linked together?
    information integrity on the blockchain thats the reason is immutable
  2. What does the block structure look like in bitcoin?
    data + previous hash + nonce(you change the nonce to reach target) = block hash ( is a target for the dificulty)
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