Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#1768

  1. This increase security because is one of the previous blocks are changed then all subsequent blocks change as well because they are cryptographically linked.

  2. The block has a Nonce, the hash of the previous block, list of transactions and has a hash.

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#1769
  1. each block is connected by a link, all previous blocks are connected to the next block. without the link that blockchain would be invalid. it shows the integrity of the blockchain – no errors.
  2. Block, nonce, data, hash of previous block and hash of current block.
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#1770

  1. it is important so someone cant go back and change one block, since they would have to re mine all the next blocks again which would lead to a financial deficit.

  2. a block is structured by the following things:

    a. The Previous hash
    b. The Data ( transactions)
    c. The Nonce (random number that has to be guessed by the miner in order to generate the blocks hash)

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#1771

  1. The blocks are linked cryptographically together for highest security reason. This is also the in-built trust in maths which is present inside the basic rules of BTC game. It is also a one direction security building method which makes back change infeasible.

  2. the block structure announces the block number, the nonce, the listed transactions (data) in this block, the hash of the previous block, and the computed hash for this current block. Then: the miner checks mine button as long as needed or another miner wins this block hashing.

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#1772
  1. Why is it important that the blocks are cryptographically linked together?
    Linking blocks cryptographically increase the security of the information by ensuring that changing data or information in the previous block will subsequently invalidates the rest of the blockchain (current and future blockchain data). This makes it difficult for people to change / reverse a transaction.
  2. What does the block structure look like in bitcoin?
    The block hash was calculated based on the data consisting the previous block hash, transaction data, and a random nonce.
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#1773
  1. The longest blockchain will be the valid one, PoW. The hash links will make the blockchain secure and un-corrupted. The secure network ensures no double spending.
  2. Previous hash, nonce, current block data (tx) = this blocks hash. The next block will include this blocks hash and, nonce, data and create a new hash, and so on.
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#1774

[quote=“ivan, post:1, topic:8433, full:true”]
Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?
    Because it is what provides the security and prevent any changes from previous block.

  2. What does the block structure look like in bitcoin?
    is the combination of the previous hash, transaction list and nonce

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#1775

  1. This way it makes impossible to change anything from a block. To change it, you will need to change not only one block, but also the following and the ones that are being built in this moment, so it will take too many years until get to change the most present block.

  2. Previous hash
    Tx list
    Nonce

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#1776

easy to see the coordination and immutable structure put in place , it shows how if you try change in fo to one block the next block will automatically change and so on.

the blockchain consists of a list of previous transactions the has and the nonce [ which is a number that automatically generates the hash]

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#1777

Because when the blocks linked together it ensures that if anything is changed in previous blocks, the link sto the next blocks would be broken
The block structure is a previous hash, transactions and nonce.

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#1778
  1. Why is it important that the blocks are cryptographically linked together?
    Linking blocks form un blocked chain which secure data integrity giving the blockchain its immutability characteristic.
  2. What does the block structure look like in bitcoin?
  • hash from previous block
  • transactions
  • nonce
  • current block hash
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#1779
  1. It secures the network of the blockchain, immutability is a big advantage for blockchain.

2.The hash of the block consists of the hash of the previous block, the data of all transactions and the
nonce.

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#1780
  1. Why is it important that the blocks are cryptographically linked together?

It is importance to enable the security of the entire blockchain. If one block is tampered with, all blocks mined forward in time would become invalid as their hashes would have be modified. This linkage is why malicious actors have a difficult time tampering with the integrity of the chain (if they even bother to make a futile attempt).

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

Block are essentially data structures consisting of transactions and block headers. Block headers contain basic information such as: Block number, time stamp, block hash, and block nonce. The block hash is determined by the nonce, hash of the previous block, and transaction data within the block.

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#1781
  1. To guarantee the overall security and data integrity of the network. Additionally, having blocks cryptographically linked is a more efficient way to manage the database as complex transactions and block history can be referred to by their cryptographic hashes.
  2. A succession of blocks linked together by a hash pointer. Internally, the block is composed of a list of transactions, the previous block’s hash a nonce.
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#1782

A block consists of the previous block hash and new transactions :slight_smile:

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#1783

  1. Using cryptographic hash functions linked together, we ensure previous blocks remain tamper-evident

  2. It is based on the current transactions in the block plus the previous hash and the nonce that needs to be guessed to solve the puzzle.

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#1784

  1. Helps increase the security (and anti-censorship etc.) of the blockchain. Harder for the blockchain to be altered. If it were to be altered the point of the blockchain would be rendered dead; so, people would no longer really be using it.

  • Block header
  • Block version
  • Timestamp
  • Current difficulty target
  • Hash of previous block (pointer)
  • Nonce
  • Hash of Merkle root
  • Transaction Counter
  • Transactions

(idk, is that accurate?)

But mainly, miner’s transactions + hash of prior block + nonce that when all hashed together = new block’s hash that is below the current difficulty target.

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#1785

  1. This is what maintains the integrity of the data on the blockchain. Each block is signed with a digital finger print and changing just one character in the data of a block would completely change the hash for that block.

  2. The hash of the block is based on the list of transactions in the block plus the hash of the previous block plus the nonce which needs to be under the difficulty target to be accepted and the hash of the current block.

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#1786
  1. They are cryptographically linked together so that no one miner can alter a previous block without also needing to append the block after and resolve the equasion. This ensures the incentive to solve the largest chain is always upheld.
  2. Blocks are arranged and linked together like a chain so the newest block can only be solved with the information from the previous block, nonce and tx’s within.
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#1787

1- so when one block is changed, the hash in that block and all subsequent blocks changes
2- it is made up of data and a hash of the data, the previous hash and the nonce

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