Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#2512

  1. Why is it important that the blocks are cryptographically linked together?
    This makes it virtually impossible to change a block thus making the chain secure. One block cannot be altered without altering the previous block and all following blocks.

  2. What does the block structure look like in bitcoin?
    Transaction list, hash of previous block and a guessed nonce

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#2513
  1. Why is it important that the blocks are cryptographically linked together?

Basically so you can establish immutable trust in the network, you can prove that any transaction is included in a block by creating an authentication path or merkle path as it is known and check if those hashes correspond all the way back. This is why it is very complicated to cheat a blockchain. To change one thing means you must change everything.

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

A block for example is a container data structure that aggregates transactions for inclusion in the public ledger, the blockchain. The block is made of a header, containing metadata, followed by a long list of transactions that make up the bulk of its size. The block header is 80 bytes, whereas the average transaction is at least 250 bytes and the average block contains more than 500 transactions. A complete block, with all transactions, is therefore 1,000 times larger than the block header.

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#2514
  1. Important to keep the integrity of the whole blockchain. To ensure no double -spends.
  2. The block structure shows the block reward the miner received plus transaction fees, block size, hash of previous block, hash and nonce.
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#2515

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

Itā€™s important for blocks to be cryptographically linked together because this shows proof-of-work. It becomes extremely difficult to modify anything in the previous blocks overall increasing the security of the network.

What does the block structure look like in bitcoin?

The block structure in bitcoin consists of the previous hash, the list of transactions, and the nonce.

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#2516
  1. Why is it important that the blocks are cryptographically linked together?

Maintain the iintegrity of the blockchain.

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

Blocks in a sequence with a cryptographic link from one block to the next.

1 Like
#2517

Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?
    To avoid any rewritting of any block as changing one will lead to the change of all the next block which is impossible and so to get the blockchain trustless

  2. What does the block structure look like in bitcoin?
    Previous Hash, Transactions and Nonce

1 Like
#2518
  1. Why is it important that the blocks are cryptographically linked together?
    A: to make it extremely hard to change previous transactions. because they are linked in such a way, you will have to re-mine all blocks that come after the one you altered in order to be successful in the alteration.
  2. What does the block structure look like in bitcoin?
    A: the blocks are made up of data (transactions), the previous blockā€™s hash, the nonce, and the current blockā€™s hash
1 Like
#2519

  1. Why is it important that the blocks are cryptographically linked together?
    Tis is to ensure the integrity and security of the network. To change anything information on the blockchain, one will have to do the same with every single block on that chain and have this verified through consensus.

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

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#2520
  1. To secure the data from being altered.
  2. One block in the chain contains the hash of previous block plus the tx of the current block.
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#2521
  1. It is important to link blocks cryptographically so that they cannot be changed easily. Once a block is created it gets increasingly more difficult with time to go back and change it. This secures the network and ensures provenance.
  2. There are three elements to a block, these are the transaction data, the previous blocks hash and a random number called a nonce.
1 Like
#2522
  1. Why is it important that the blocks are cryptographically linked together?

Like in real history, where previous event influences the next one, so is it in blockchain. There is no last act without first one and everything inbetween. That way, the chain cannot exist without one single block, because then transaction history would cease to exist. It seems to me, that blockchain was being created by mirroring laws of nature.

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

Block consists of block header and transactions, of which the first one has no inputs, because these are freshly mined bitcoins that serve as block reward.
In block header there can be found block hash, number of confirmations, timestamp, merkle root, size, nonce, transaction volume, block reward and fee reward.

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#2523

It is important that blocks are cryptographically linked together to make sure the blockchain has not been changed or altered. This cryptographic link is one of the things that make the blockchain so secure.

The block structure of bitcoin is:
the ash of previous block
transaction list
nonce

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#2524

1.The blocks are cryptographically linked together to make impossible to weaken, change or corrupt the data.
2. The block structure in bitcoin is: previous hash, a nonce or puzzle, the length of the block and the hash of the current block.

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#2525

  1. Why is it important that the blocks are cryptographically linked together?
    Blocks are cryptographically linked together because it makes it more difficult to change a transactions on the blockchain. Data immutability. This also serves to secure the network.

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

The structure of the blockchain looks like block with the previous hash, recorded transactions, and nonces.

1 Like
#2526

  1. Why is it important that the blocks are cryptographically linked together?
    To ensure the integrity of the blockchain. Were a block to be altered it affects the previous blocks hash and also the next blocks hash. This follows all throughout the chain and so a fraudulent/bad block will be rejected by the network.

  2. What does the block structure look like in bitcoin?
    A block structure consists of the previous blocks hash, current transactions and the nonce.

1 Like
#2527
  1. Why is it important that the blocks are cryptographically linked together?
    To ensure that if a block has been changed, all previous blocks must also be changed.
  2. What does the block structure look like in bitcoin?
    Structure has nonce, previous hash, the transactional data and the generated hash of the current block
1 Like
#2528

Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?
    This Ensure a extra layer of protection, if you try to modify one block the whole chain broke and you need to begin to mining again all the block in this chain, almost impossible to do, so this generate extra security to blockchain (immutability)
  2. What does the block structure look like in bitcoin?
    Previous block hash information
    Data (transactions inside of the block)
    Blocksize
    Nonce
    Hash of the Block
1 Like
#2529

Blockchain gets its name from ( blocks are chained to each other cryptographically))ā€¦ In order to ensure the correct order of transactions in the blockchain, :chains:,each block contains the hash of the previous block ā€¦well i think :thought_balloon: ā€¦ The first block in a blockchain is known as the ^genesis block^^?:chains: . each blockchain has its own genesis block , the bitcoin network has its own genesis block, and likewise Ethereum also has its own genesis block. i hope iā€™m in the right topicā€¦ā€™(ā€™.i donā€™t even want to post this smart guy always discourages me feels see smarter than everybody else I guessā€¦)anyways thanks for the reading :open_book: was nice & understanding ,so i thought :thought_balloon: iā€™d put in what i think :thinking: just thoughts :thought_balloon:ā€¦i got

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#2530

  1. To prevent changes to the data.

  2. Block number, Nonce, Txn Hash

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#2531
  1. By linking each block cryptographically, it helps to secure the blockchain by preventing people from changing it.
  2. Each bitcoin block contains the transaction data within the block and a hash of the block itself which is used to link to the next block.
2 Likes