The explorer is running in 'regtest' mode. This saves disk space, but there is limited data.
The code for this application can be found at github.com/pdxrod/blockchain_explorer.

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Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mkrgsKuFE

Height: 171
Hash: 30c783518185a9c19d327835536bfa1fd3ce0baaadfc1ef76660a8f86088f9a9
Previous block: 7db19868f68863c3f1b2e90a2036c6516ef958b9894d38d545e426441eefcd1d
Next block: 39b083e9cbe21c4124aa8ecd58d5dac6e354e7bc61399bbc47a34ed7474d5ffc
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074762
Stripped size: 228
Size: 228
Nonce: 1
Merkle root: bd63273e4819a8d50dc9c17520e860eb38221ae3fc288f5ae37438f838bb5fb6
Median time: 1544074761
Difficulty: 4.656542373906925e-10
Confirmations: 31
Chainwork: 0000000000000000000000000000000000000000000000000000000000000158
Bits: 207fffff