Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#1067

1.the block need to be link together with cryptography in order to increase the security of the entire blockchain.
2.
Number of block.
Nonce
Transactions
hash of the last block
hash of the new block,

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#1068

  1. ensures blocks remain immutable

  2. previous hash, transactions, nonce are together represented by the particular block hash

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#1069
  1. Why is it important that the blocks are cryptographically linked together?
    For security perspective, It is important to keep track of any change in the previous blocks, any change in the transactions of previous blocks will change the hash of the block and automatically the hash of the current blockā€¦
  2. What does the block structure look like in bitcoin?
    -Previous hash, TX list, nonce
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#1070

Homework on Blockchain and Mining Visually - Questions

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

For security reasons, so that the previous one cannot be changed.

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

Hash of the previous block, a list of transactions and nonce

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#1071

[quote=ā€œivan, post:1, topic:8433ā€]

  • Why is it important that the blocks are cryptographically linked together?
    Because in cryptography, if any changes were made on the blockchain the whole blockchain from where a change was made would not work. From where the initial change was made the block hash would change and therefor all future blocks hash would change and the network by consensus would chuck it out.
  • What does the block structure look like in bitcoin?
    the previous block hash, Tx data, Nonce and current block hash.
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#1072

By accuracy i meant the success of the transaction hashing correctly, but in hindsight i see the question is not asking that. Appreciate the feedback, keeps us thinkingā€¦ :slightly_smiling_face:

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#1073
  • Why is it important that the blocks are cryptographically linked together?

In essence security, verifiability. It makes it also st impossible for th chain to be changed at any point.

  • What does the block structure look like in bitcoin?
    Block number
    Nonce
    Transactions
    Previous hash
    Block hash
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#1074

  1. Its very important that the blocks are cryptographically linked together because it assists in keeping a secure, hashed, trustless ledger that is technically impossible to alter. The process of cryptographically using these hashes and keys plays a part in the puzzle to maintain the difficulty needed to reach consensus. And enables a very high level of difficulty in attempting to alter consensus.

  2. The block structure includes the following;

prev. block hash + tx list of current block + nonce = hash of current block

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#1075

[quote=ā€œivan, post:1, topic:8433ā€]

  • Why is it important that the blocks are cryptographically linked together?
    So that it is ā€˜impossibleā€™ to go back and change any details in previous blocks, which would change its hash and break the links between the blocks. The blockchain would then be rejected by the network.
  • What does the block structure look like in bitcoin?
    Hash of previous block, TXs list, time stamp, Merkle root and nonce
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#1076
  1. Why is it important that the blocks are cryptographically linked together?

Is the basic structure for a inmutable network. Each block come from each other like a DNA. The blocks are build with hash information of the previews block. This allow you also to make sure that information is reliable.

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

Hash of the block, number of the block Incoming transactions and UTXO.
The visual representation is ike a Chain. Thats because is so called Blockchain. Blocks of information, chained together.

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#1077

Thatā€™s is why we are here for!! :slightly_smiling_face:

#1078

  1. Cryptographic linked blocks are required for immutability of the blockchain network. It is too much work (and cost) to change a previous block. Miners are incentivized not to do this through block rewards and transaction fees.

  2. BTC block structure is:
    a) Hash of the previous block
    b) New transactions
    c) Nuance
    d) (Difficultly target)

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#1079

  1. It is important that the blocks are cryptographically linked together to ensure the security, immutability, and integrity of entire blockchain and network, i.e. all data are set like Digital Stone.

  2. BTC Block structure: TX list, Previous (Block) Hash, Nonce, Current (Block) Hash that is then compared with special no. called Target.

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#1080
  • Why is it important that the blocks are cryptographically linked together?

Link between blocks binding them all together and cryptographic information from previous block are transported to new created block with then will be used as a part of next block.Because of its structure, blockchain allowed for full transparency and operation on trustless way this couldnā€™t be achieved without cryptographically linking them together.

  • What does the block structure look like in bitcoin?

Block to be created need to include at least:
Hash from previous block
Transaction List
Nonce

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#1081
  1. Why is it important that the blocks are cryptographically linked together?
  • the most important reason is that because it its so unique and interlinked, it makes it almost impossible to change the chain, without spending a huge amount of resources to crack it. Its much easier to make money playing by the rules then against it.
  1. What does the block structure look like in bitcoin?
  • a block or hash is made up of 1. Previous Hash 2. Current Transactions 3. nonce, the miners are basically just randomly guessing numbers to win the block rewards. The more hash power the more chances you will win the block.
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#1082
  1. It is important because the hashes of the current blocks are based on the hashes of previous blocks. This maintains the integrity of the block because if you were to change a previous block then the links of subsequent blocks would be broken and youā€™d have to repeat the mining process (which is extremely difficult)
  2. It is comprised of a hash that is based on the hash of the previous block, the list of transactions in the current block and the nonce.
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#1083

The ensures security and immutability. If one block changes its hash, all subsequent block hashes get changed, thus resulting in an altered block chain that gets rejected by the network. This ensures immutability.

each block contains transactions that get hashed, then that hash gets hashed with the previous blockā€™s hash to produce the hash signature of that block. This hash is now hashed with the next blockā€™s transaction hash, and so onā€¦

#1084
  1. So they become harder to change or remove.
  2. Each block contains current time, transactions, reference to the block before it and answer to a difficult cryptographic puzzle unique to each block.
#1085

  1. To make sure there are no changes done in the previous blocks

  • Block Number
  • Nounce
  • Data
  • Previous Hash
  • Current Hash
#1086

[quote=ā€œivan, post:1, topic:8433, full:trueā€]
Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?
    Answer: This is what helps insure the immutability. A block cannot exist or survive without the information from the previous block which has info from the previous block etc.

  2. What does the block structure look like in bitcoin?
    Answer: It has the new hash of its own block plus the hash of the previous block which is structured the same way. Each new hash is generated on the basis of this dual input.