Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#4542
  1. This ensures the integrity of the blockchain.
  2. Each block contains the previous hash, a TX list, and a nonce which are then hashed. This hash is then used in the next block. All the blocks are cryptographically linked together.
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#4543

  1. To maintain the integrity and security of the network.

  2. Like a big linked list of blocks, which are linked by the hash of the previous block.

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#4544

This makes it virtually impossible to go back and change transactions. It would require completely re-mining all the subsequent blocks.

A block contains the current time, a record of the transactions, the hash number of the block that came before it, and the nonce.

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#4545
  1. In order to keep the blockchain intact and not to change or delete any transactions. For each new block created, it will be encrypted with the hash function that will be confirmed via the puzzle in relation to the target price.
  2. You have to think of a block chain where each block is linked to the previous one thanks to encryption. each block created is encrypted by taking into account trx of the present block, hash of the last block with the guess of the nonce.
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#4546
  1. Why is it important that the blocks are cryptographically linked together?

So security and safety. It makes the chain trustless as it is near impossible to alter already confirmed blocks.

  1. What does the block structure look like in bitcoin?
    Block contains: hash of the previous block, the transactions of the current block fetched from mempool; and a nonce.
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#4547

  • Why is it important that the blocks are cryptographically linked together?
    they all share a similar hash function that all ties the blocks together, this helps to protect the blockchain from compromised data being altered in the blocks, if the data is altered then all the blocks will need to be updated.

  • What does the block structure look like in bitcoin?
    previous hash functions. list of transactions and the nonce

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#4548
  1. Cryptographic link between the blocks is for the purpose to secure the integrity of the network.
  2. Hash of the previouse block
    Hashes of all the transactions in the block
    Nonce.
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#4549

A1. To keep the chain secure.
A2. Transactions, previous block hash, nounce

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#4550
  1. They are linked together because it ensures the integrity of the blockchain. It also makes it impossible to re-engineer or hack.
  2. Nonce, TX and previous hash.
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#4551
  1. Blocks are cryptographically linked to ensure the network is secure and follows protocol forming a blockchain
  2. The bitcoin blockchain comprises of a mined blocks which create a digital fingerprint called a hash. Each hash comprises of the previous hash, new transactions and the nonce.
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#4552

1 it is important that the blocks are cryptographically linked together because in this way if the hash of a previous block changes then all those following it will change.

2 a block is composed by a hash (the fingerprint), new txs, prev hash and nonce.

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#4553

  1. Why is it important that the blocks are cryptographically linked together?
    To stop hackers from changing tx’s in previous blocks, basically increasing security of the system

  2. What does the block structure look like in bitcoin?
    Previous block hash plus tx’s of current block plus nonce = current block hash

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#4554
  1. It is merely important that the blocks are cryptographically linked to each other to secure the network to ensure no double spending.
  2. The block structure looks like the hash of the block is based on the transactions in the block plus the previous has and the nonce that needs to be guessed.
#4555
  1. For immutability, any change in a previous transaction will invalidate that block and all subsequent blocks. This is great security.
  2. Each block has a hash that is based on all transactional data in the block, plus the hash from the previous block, plus a nonce.
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#4556

Screenshot 2022-10-27 at 11.24.29

  1. It is important that the blocks are cryptographically linked together because this makes it harder to change them. This in turn encourages miners to stick to the protocol and provides a secure and integral network that can be trusted.

  2. Block #, nonce, transaction data, previous hash, hash

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#4557

It is important because, it ensures the security. With blocks cryptographically linked, it is not possible to change one block without changing all blocks after it.

A blocks hash consits of the hash of the previous block, the txs in the current block and the nonce.

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#4558

  1. To ensure incorruptibility and immutability

  2. Each block consists of the transaction, nonce, and hash of the previous block

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#4559
  1. linking the block secures the blockchain because it is not possible to manipulate one block without affecting the ones going forward.
  2. hash answers that then influence and connect the next hash.
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#4560

  1. It helps secure all transactions on a blockchain. If any changes were made to one block it would no longer align with everyone else’s copy. When a cross reference is done by all other nodes the altered version wouldn’t fit and would be rejected.

  2. New blocks are added to the end of the blochain and stored linear and chronologically. Each ock contains its own hash along with the hash from the block before it. Hash codes are created by a mathematical function that turns digital information into a string of numbers and letters. If that information is edited in any way then thevhash code changes as well.

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#4561

  1. So that blocks can not be altered or changed. It ensures that if there is any change to blocks then all others become obsolete.

  2. Each block consists of - previous hash, nonce, current hash, block number, difficulty target and block size.

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