Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#2472

  1. Because they work on The same hash algorythm sha256 that guarantee the same difficulty to mine again The block guessing The nonce

  2. The are made by a nonce, transactions and previous hash

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#2473

[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?

The cryptographic linking of the block is what creates the high level of security, immutability and trustlessness because it makes changing data basically impossible.

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

Each block contains a hash that is calculated from the hash of the previous block, the list of verified transactions contained in the block, and a nonce.

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#2474
  1. It is important that the blocks are linked together because it strengthens security by ensuring that nobody can make a change in previous blocks.
  2. The block consists of transaction data, nonce, the hash of the previous block, and the hash of the current block.
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#2475
  1. To ensure each transaction is unique and secure and there is no possibility to alter or change the history of transactions
  2. Block Number, Hash current block, Nonce, Previous Block Hash,Tx Hash, Transaction data
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#2476
  1. Why is it important that the blocks are cryptographically linked together?
    is increasng security as in order to hack more than one blocks you need to spend thousands of years
  2. What does the block structure look like in bitcoin?
    every block contains the tx list the hash of the previous block and a nonce that has to be guessed
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#2477
  1. It is important so that the data in every single block remains immutable.
  2. Each block contains the previous block hash, transactions, nonce and its own hash that connects with the next block.
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#2478
  1. This promotes validity and security, as well as help carry out the code to increase difficulty as each new block is mined.
  2. -Nonce
    -Transaction
    -Previous Hash
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#2479

  1. This makes the network secure and next to impossible to compromise the data in the blockchain.

  2. Each block contains the hash of the previous block, the hash of the current block, the transactions in the current block, and the nonce generated for that block.

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#2480

It is crucially important that every block as well as every link between blocks is structurally secure and cannot be tampered with so this is why the hash function is applied to blocks as well as the connecting links.
The block structure looks like a series of data packages (Blocks) and encrypted links that contains the addresses of the blocks at either end.

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#2481

Blocks only have a link to the previous block by their block hash. :slight_smile:

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#2482

Homework on Blockchain and Mining Visually - Questions

1. Why is it important that the blocks are cryptographically linked together?
It is important that all the blocks are cryptographically linked together to secure the network. It means that whenever a block is changed it changes all the blocks linked. The network will reject this. It can only be changed if every block is re-mined and this is practically impossible.

2. What does the block structure look like in bitcoin?
A block in bitcoin consists out of data (UTXO’s), previous block hash, and a nonce. A block carries data from one block to the next using hash function SHA-256 - data - hash - new block mined and confirmed.

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#2483
  1. The integrity of the block chain is based on the link between the blocks, this cryptographic link once set determines the past and the future of the block chain it’s self.
  2. A series of virtual blocks containing list of transactions linked together as s powerful structure of which it’s foundation is math & physics. It’s cryptographic muscles tendons of this chain prevent the UTXO from ever being in error.
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#2484

  1. It is important that blocks are linked cryptographically to ensure the validity of the connected blocks. Since each connection is based partially on the connected block, any changes will be detected.

  2. In bitcoin, the structure consists of block number, nonce, data, previous block hash, and current block hash.

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#2485

What links the blocks together? :slight_smile:

#2486

A series of virtual blocks containing list of transactions linked together as s powerful structure of which it’s foundation is math & physics. It’s cryptographic muscles tendons of this chain prevent the UTXO from ever being in error. The links between the blocks are formed from the hash functions of the previous previous block, The nonce, the previous hash function are contained in the link, which is a compilation of past block data.

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#2487

  1. It ensures that all transactions that are included into the Bitcoin blockchain are correct.

  2. Block #, Nonce, Transaction Data, Previous Hash, Hash of the current block

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#2488

  1. Why is it important that the blocks are cryptographically linked together?
    Once the blocks are photographically linked, manipulating or changing previous transactions becomes impossible.

  2. What does the block structure look like in bitcoin?
    previous block hash,current block transactions, and a nonce (some arbitrary number)

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#2489
  1. Why is it important that the blocks are cryptographically linked together?
    This helps immutability. If a block is changed, all of the cryptographic puzzles coming after have to be solved again.
  2. What does the block structure look like in bitcoin?
    It looks like blocks connected by chains. The blocks have transactions, the hash of the previous block, and a number called a nonce. The chains take time and money to make, and ensure that none of the info inside the blocks is changed.
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#2490
  1. Why is it important that the blocks are cryptographically linked together?
    To mantein the integrity of the blockchain and the miners play by the rules, doing the network more and more secure.
  2. What does the block structure look like in bitcoin?
    A TX List + the previous hash + nonce
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#2491

1.) Blocks remain immutable.
2.) Hash of the current block, transaction list, hash from the previous block, and nonce.

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