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区块链应用作业代写 ELSS2111代写

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区块链应用作业代写

Online Assessment 2020-21

Course Code : ELSS2111

Course Title : Blockchain Technology and Applications 

区块链应用作业代写 In case of Pay-to-Script-Hash (P2SH), you provide the script as below, what are the advantage(s) and disadvantages?

Question 1

What is the general structure and content of a block of Bitcoin? (10 marks)

Question 2   区块链应用作业代写

Which part(s) of the block content makes up the immutability of blockchain? (4 marks)

Question 3   区块链应用作业代写

Which part(s) of the block content is generated during mining? (6 marks)

Question 4

Suppose you are a Bitcoin expert and are given some information about a crypto “Bcoin” which is supposed to work almost in the same way as Bitcoin. Now, scrutinize the given block information and identify which block may contain inconsistent or not reasonable data, and give explanations to support your answer. (note: it is known that the block numbers and the time stamps should be all correct.)

The extracted information of three blocks are given as below. (12 marks)

Block number N
Hash 000000000003ba17aa200b1cecaad478d2b00432346c3f1f3986da1afd33 e503
Confirmations 560,000
Timestamp 2010-11-09 10:54
Height N
Number of Transactions 4    区块链应用作业代写
Difficulty 14,484.16
Merkle root f3e92742aca4b5ef85488dc37c06c3282295ffec960994b2c0d5ac2a25a95 763
Miner Unknown
Version 0x1
Nonce 264,148,111   区块链应用作业代写
Transaction Volume 53 Bcoins
Block Reward 50 Bcoins
Fee Reward 0 Bcoin
Block

number

n + 100,000
Hash 000000000000032a7dedef4a161fa058a2d67a173a90155f3a2fe6fc131e0ebf
Confirmation s 260,000
Timestamp 2013-10-02 18:45
Height n + 100,000
Number of Transactions 388
Difficulty 13,640.12
Merkle root a04f8101f50fd9c9b3e5252aff4c1c1bd668f878fffaf3d0dbddeb029c307e84
Miner Unknown
Version 0x4
Nonce 4,158,183,000
Transaction Volume 211650.04 Bcoin   区块链应用作业代写
Block Reward 6.25 Bcoin
Fee Reward 0.63517500 Bcoin
Block

number

N + 400,000
Hash 00000000000000000014fb37364cbf81fd49cc2d51c09c75c35433c3a1945d02
Confirmation s 160,000
Timestamp 2018-11-19 02:35
Height N + 400,000
Number of Transactions 2701
Difficulty 1,873,105,475,000.61
Merkle root 31951c69228a95a46b517ffb0de12fec1bd0b2392aec07b64573e03d ed31611f
Miner Unknown
Version 0x3
Nonce 1,560,058,000   区块链应用作业代写
Transaction Volume 14017.30 Bcoin
Block Reward 12.50 Bcoin
Fee Reward 3.39350615 Bcoin

Question 5

What are the differences between the genesis block and the other blocks in Bitcoin?(10 marks)

区块链应用作业代写
区块链应用作业代写

Question 6  区块链应用作业代写

In Bitcoin, Unspent Transaction Output (UTXO) model is used. Amy, Betty, and Cathy initially had none of bitcoin and now just received 10 bitcoins each from someone. Then, Amy sent 5 bitcoins to Betty with transaction fee of 0.5 bitcoin and kept the changes. Then, Betty spent 12 bitcoins to Cathy with transaction fee of 1 bitcoin and kept the changes. Then, Cathy sent 11 bitcoins to Amy. Finally, suppose all the above bitcoin transactions have been successfully done, how many UTXO is now available to Amy, Betty, and Cathy for spending respectively. On the other hand, they wanted to keep the transactions in secret and hide them from each other. Please explain to them why Bitcoin transaction is not perfect anonymous. In order to keep pseudo anonymous, what do you advise them to do in the very beginning of these transactions?(15 marks)

Question 7

Suppose a user A is sending bitcoins to another user B. How user A knows the bitcoin transaction is taking place and gets confirmed and secured transactions? Explain your rationales. (10 marks)

Question 8

Suppose the function f(x) such as

x f(x)
-4 16
-3 9
-2   区块链应用作业代写 4
-1 1
0 0
1 2
2 4
3 9
4 8

Please comment on this function whether it can comply with the properties of being a cryptographic hash function which can be applied for achieving a tamper evident blockchain system. (8 marks)

Question 9      区块链应用作业代写

Suppose Peter, Mary, Susan, John and you are the directors of a FinTech company and now your customer is preparing to settle a payment by sending bitcoins to your company.

In case of making the transaction with Pay-to-Pub-Key-Hash (P2PKHZ), what information you need to provide with the customer?

In case of Pay-to-Script-Hash (P2SH), you provide the script as below, what are the advantage(s) and disadvantages?

区块链应用作业代写
区块链应用作业代写

Question 10

Sketch a diagram showing the Hyperledger Fabric application on IBM blockchain platform such that

(1)Five organizations: Org1, Org2, Org3, Org4,Org5

(2)Five organizations have its own Certificate Authority: Org1CA, Org2CA,Org3CA,

Org4CA, Org5CA

(3)Five organizations have its own Membership Service Provider: Org1MSP,Org2MSP,Org3MSP, Org4MSP, Org5MSP

(4)Five organizations have its own peer node: Org1Peer1, Org2Peer1,Org3Peer1, Org4Peer1, Org5Peer1   区块链应用作业代写

(5)One business group: A,C, & E that runs the smartcontract#1

(6)Another business group: A,B,C,D, & E that runs the smartcontract#2

(7)Five organizations have its own external application: Org1ExtApp, Org2ExtApp, Org3ExtApp, Org4ExtApp, Org5ExtApp, to access the blockchain and invoke the requested smartcontract

(8)Two business groups are independent to each other  区块链应用作业代写

What do you suggest for setting up endorsers and transaction validation policy in the ordering services for the business group of five organizations? Give reason to support your suggestion. What does the external application requires in order to access the blockchain and invoke the smart contract?

What difference about data ledger(s) stored in Org1Peer1 and Org2Peer1? (15 marks)

区块链应用作业代写
区块链应用作业代写

 

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