Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#2935

  1. Why is it important that the blocks are cryptographically linked together?
    To ensure the security of the network.

  2. What does the block structure look like in bitcoin?
    The block is made up of the previous hash, transaction data, nonce, and the current hash.

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#2936

[quote=“ivan, post:1, topic:8433”]

  • Why is it important that the blocks are cryptographically linked together?
    Its used as a secure way to ensure data integrity, and not able to alter the history of tx
  • What does the block structure look like in bitcoin?
    Block number,nonce,Data, previous block hash, current hash . it take the hash. of the previous block and data of the utxos and generate a number that is less than the target to achieve for block to be confirmed
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#2937

  1. Why is it important that the blocks are cryptographically linked together?
    To avoid cheating, otherwise it would be easy to go back an reinvent block, at the end of the day that’s why technology is called blockCHAIN

  2. What does the block structure look like in bitcoin?
    Hash of the previous block, plus utxo’s, plus nonce

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#2938
  1. Why is it important that the blocks are cryptographically linked together?
    It si important that blocks are cryptographically linked so that there is complete security of the blochain i.e. no double spending, n chanign of previous trasnaction etc there is only 1 truth.
  2. What does the block structure look like in bitcoin?
    The block structure has a hash which is a digital fingerprint and is made up of the transcations in the block, the hash of the previous block and the nonce ( which is guessed ) and the hash has to be lower that the target set. The target depens on how many miners there are. The more miners the lower the target so the harder it is to get a hash below the target.
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#2939

  1. Why is it important that the blocks are cryptographically linked together?
    Because this ensures that any alteration to a previous block in the chain will have a ripple effect on every successive block. This increases the security of the network by making it impossible to secretly change old transactions and cheat the system.

  2. What does the block structure look like in bitcoin?
    Each block is composed of a hash, which itself is created from all of the available recent transactions that will fit in the block, the previous block’s hash, and the nonce.

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#2940

  1. Why is it important that the blocks are cryptographically linked together?
    The blocks are cryptographically linked together to secure the network based on physics and mathematics. This ensures that previous data is very difficult to alter.

  2. What does the block structure look like in bitcoin?
    It consists of a nonce, transaction data, current hash and the previous hash from the previous block.

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#2941
  • Why is it important that the blocks are cryptographically linked together?

This is to ensure that previous blocks cannot be changed (attempt to double spend, e.g.). If somehow someone changed a transaction in a previous block the blocks after would be immediately severed. So for integrity and security of the blockchain the blocks are linked.

  • What does the block structure look like in bitcoin?

The first block is blank for inflation. The completed blocks have:

Block Header containing the following metadata: version, last block number, Merkel Root-all transactions based together in a single line, time and target value that miners had to get beneath.

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#2942

  1. Why is it important that the blocks are cryptographically linked together? — Because any changes in any block will effect the link to the next block and the effects will propagate forward, effecting and changing the entire blockchain, which makes it completely invalid and to be rejected by the rest of the network. Any potential gain of changing a past transaction would be outweighed by the cost of recalculating all changed links compared to benefit of simply playing the by the rules and solving for new blocks.

  2. What does the block structure look like in bitcoin? — Blocks linked together, block contains their own hash/fingerprint, the previous block’s hash, the list of transactions, and the nonce

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#2943

Why is it important that the blocks are cryptographically linked together?
To make it exponentially harder to change an already mined block, thus, ensuring the blockchain integrity

What does the block structure look like in bitcoin?
Previous Block Hash
Nonce
Tx
Current Block Hash

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#2944
  1. Why is it important that the blocks are cryptographically linked together?

To link the blocks cryptographically together establishes high security and consent within the network.

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

A block consists of
the previous hash ( the previous link, containing information from the previous blocks& links)
the transactions from the current block
The Nonce, Number only used once

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#2945

  1. Prevent the data from being altered or manipulated.

  2. Hash , Previous hash , TX list and nonce

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#2946

  1. This makes it practically impossible to ever alter the blockchain.

  2. The previous hash, the transaction list and the nonce.

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#2947

1 Because this way the data in the blockchain is secured.

2 Its the data of previous transactions of the block on hash code, the current block transactions and nonce.

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#2948

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

  • security - links between blocks is a cryptographic puzzle
    -immutability
    -integrity

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

  • data transactions
  • the previous hash function
  • nounce
    -new hash output.
    :+1:
2 Likes
#2949
  1. Why is it important that the blocks are cryptographically linked together?

When the blocks are cryptographically linked, the system is irreversible because of the one-way function. If you were to tamper with a block it would affect the hash of the previous (parent block) and the following block. This would be easily traceable by other nodes. Miners are incentivized to create a secure network that prevents censorship, the ability to double-spend and alter history.

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

Magic No, Blocksize, Blockheader, Transaction Counter, Transactions

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#2950

It is important the blocks are cryptographically linked together to ensure security of the block chain enabling longer chains and ultimately more blockchains created.

The block structure of a Bitcoin consists of a nonce, transaction list, previous hash and current hash.

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#2951

Homework on Blockchain and Mining Visually - Questions

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

Answers:

1/ The blocks are linked together , It is a mathematical puzzle that bring data immunity into the blockchain, cannot modified previous data block or it will break the link between each others blocks.

2 / The block is made of data, TX Hash , inputs, Outputs , previous hash block and Nonce number, Difficulty Target

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#2952

1)To secure the network and to prevent fraud
2)Each bitcoin block has its unique hash which is made up from previous block’s hash, transactions in the block and nonce ( which is to be guessed by miners)

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#2953

  1. If they’re cryptographically linked, then it will remove any necessary trust that tampering took place. Instead, mathematically, we can verify as blocks are hardwired to behave in a linear equation like manner. If we all know the programming is to move forward only, then when someone or something attempts to change the past, the present can be notified, one way or another.

  2. Previous block, in the form of a hash.
    Transactions (UTXOs), gathered from the mempool.
    Target, for miner to guess.
    Nonce, to generate the target.
    Applicable programming, to know all of the rules of transactions.
    Block size & header.

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#2954

  1. Why is it important that the blocks are cryptographically linked together?
    For Security. To make sure that is impossible to alter the data.

  2. What does the block structure look like in bitcoin?
    Block contains Nonce, Data(transactions), Hash of previous block and Hash of the current block.

2 Likes