Coin Metrics Developer Backend Test

The two functions defined in the test are implemented in BlockchainProcessor.java

SQL

C) Write a query that will return the address with maximum even balance

D) Write a query that will return top 10 blocks ordered by total volume of spent coins

Testing

Code Coverage (Instructions) ~98%

Running code coverage generator

$ git clone https://github.com/earce/developer-backend-test.git
$ cd developer-backend-test
$ chmod +x gradlew
$ ./gradlew build
$ ./gradlew coverageReport
$ cd build/reports/jacoco/test/html

Then you should be able to click on index.html to view it as a webpage.

Assumptions:

• Coinbase transactions can only happen at the start of a block.

• Some liberty was taken in translating the objects present in the PDF from C++ to Java as there are similar structures but they are not perfectly analogous.

public static String findMaximumInboundVolumeAddress(final Blockchain blockchain,
                                                     long intervalStart,
                                                     long intervalEnd) {

• This method returns a single address, however it's conceivable that two addresses would end up with the same inbound volume of coins in a window. For this reason we simply pick one address, this signature would make more sense returning a list.