COMP6521 Cryptography and Blockchain
Assignment 2 Bitcoin Investigations (10 Marks)
Due: 23:59 PM 27 July
Please find suitable Bitcoin Explorer by yourself.
1. In the fall of 2013, a 194,993 bitcoin transaction hit the network. The value of the transaction was over $149 million USD at that time. In this question, you are asked to dig out more information about this transaction. Present evidence (can be in the form. of screenshots of the tools used) for your answer.
(a) What is the transaction ID of the 194,993 bitcoin transaction? And when was this transaction broadcasted? (1 Mark)
(b) How many inputs are there in this transaction? Which UTXO in the inputs provides the largest amount of bitcoins? Please provide the corresponding source transaction ID and the output index (Index starts with 0). (1 Marks)
2. Investigate address 34xp4vRoCGJym3xR7yCVPFHoCNxv4Twseo . What is the balance of this address at the time when block 552000 mined?
Investigate address 3L41yRzWATBFS3TSHGxFAJiTxahB94MpcQ. What is the balance of this address at the time when block 611900 mined(2 Marks)
3. Trace addresses:
(i) 1KMktVDYm9bdGGUaXzFH9nikNjLDHRbFsi
(ii) 16ftSEQ4ctQFDtVZiUBusQUjRrGhM3JYwe
(iii) 3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r
(iv) 16rCmCmbuWDhPjWTrpQGaU3EPdZF7MTdUk
(v) 3P3QsMVK89JBNqZQv5zMAKG8FK3kJM4rjt
For each of the above 5 addresses, answer the following questions:
(a) Please find out the transaction ID and number of outputs for the most recent transaction this address involved in as an input. (2 Marks)
(b) For the most recent transaction this address involved in as output, please identify the transaction ID and amount of bitcoin received by this address. (2 Marks)
(c) Which single UTXO received by this address contains the largest amount of bitcoin? (2 Marks)