Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#2070
  1. to ensue that the block remain immutable
    2)Block number
    Hash
    previous hash
    transaction list (data)
    NONCE
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#2071

1/ Because this way it is achieved that first it is encoded, which makes it safe, and second that encoding depends on the info it contains, therefore if someone wants to alter the info it would be impossible because it would change the entire chain which cannot be

2/contains the hash of the info in the block plus the previous hash, plus its inputs and outputs

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#2072

  1. Why is it important that the blocks are cryptographically linked together?
    It´s because of the security of the blockchain. If you change something in a block then all the links will break and you would have to re mine them.

  2. What does the block structure look like in bitcoin?
    Every block has its list of UTXO, the hash of the previous block, and the nonce.

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#2073

Every block has a list of transactions, not utxo’s. Utxo’s are part of a transaction where utxo’s get changed ownership to other addresses.
Transactions contain more information than just utxo’s.

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#2074

  1. The linked blocks are the the backbone of the blockchains secure design, a change to any block creates a cascading change to each subsequent block through the blocks previousHash pointer.

Block{

nonce

timestamp?

data[]

hash

previousHash

}

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#2075

  1. Its one of the features that helps to keep network secure.

  2. Nonce, transactions, previous hash , and hash.

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#2076
  1. It is important that the blocks be cryptographically linked because it secures the network. It does this because if one block is changed, the hash is changed not just for that block, but for every block after it, so the entire rest of the blockchain is disrupted. In this way, no one can go back and change just one block and have it not be noticed.
  2. Each block has its own hash and the hash of the block previous to it, and the nonce which is guessed by the mining process to a particular target. Each block also has a coinbase transaction which specifies how much the miner would get paid for mining that block (including fees), and usually more transactions.
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#2077
  1. It helps makes the blockchain immutable since linking blocks together makes it virtually impossible to change previous transactions.
  2. Each block has a cryptographic hash that includes all transactions in the block and the hash of the previous block.
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#2078

  1. Its the way to keep the chain secured, immutable, because all the blocks get linked using the previous hash making it hard to break.

  2. block nonce, data, previous hash, hash.

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#2079
  1. Why is it important that the blocks are cryptographically linked together?

The link between blockchains is the way we verify that the data has not been tampered with, this link is what makes the blockchain immutable.

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

The block is made up of a hash reference from the previous block, current transactions and the nonce.

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#2080

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

  • It is important that the blocks are cryptographically linked together because it helps secure the network. A change to any block creates a cascading change.
    What does the block structure look like in bitcoin?
  • Nonce, transactions, previous hash, and hash
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#2081

Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?
    so that it is difficult to doublespend and chain the blockchain
  2. What does the block structure look like in bitcoin?
    Connected Hash comprising of TX,Prev-Hash and Nonce
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#2082

For security purposes and more difficult to alter a block.

Hash of the previous block, nonce, all tx and hash of current block

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#2083

  1. It solidifies the security of black chain. Changing the Hash, Nonce, or Data(transfer info) in any one block will have a chain affect on all other blocks. But since doing this will “unsolve” the puzzle for those blocks, this cannot happen. Instead the link is broken from the block of changed data and will be unlinked form the chain.

  2. Separate blocks with with information including the block number, Nonce, Data, previous block’s hash and hash of current block.

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#2084
  1. For safety, mining difficulty, transparency.
  2. The block structure contains: mempool with the utxo the hash witch is on every nodes, the miners that confirm the transactions and make the changes
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#2085
  1. Why is it important that the blocks are cryptographically linked together?

For the security of the network.

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

Tansaction UTXO’s, nonce, previous hash.

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#2086

The cryptographic link between the blocks creates a permanent blockchain that cannot be chained or tampered with.
The block consists of 3 parts. The hash of the previous block the nonce and the data of the current block which will be transformed into a new hash once complete.

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#2087
  1. Why is it important that the blocks are cryptographically linked together?
    Ans: To avoid the blockchain from ever being changed. The blockchain needs to remain immutable to create a trustless environment. Just one change in one block can disrupt a long chain of blocks.
  2. What does the block structure look like in bitcoin?
    Ans: Structure has the nonce, previous hash, the transactional data, and the generated hash of the current block.
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#2088

Mempool is not part of the block structure and UTXOs are outputs of a transaction. A block contains transactions that have been confirmed by miners and most importantly the hash of the previous block contained in the block header. The header also contains the nonce, timestamp, difficulty target, merkle root of transactions and version. :slight_smile:

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#2089
  1. So that if someone tries to alter one block all subsequent blocks need to be remined making the chain immutable in all practical sense.
  2. There is a hash, a nonce, and data part (containing transactions), and the hash of the previous block
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