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: 155
Hash: 524866b891c17e675b11e694e9ab7b4f7e07057feaa7765e2f9a503932c3180b
Previous block: 4490bb17d9c6e0d1fd04b26bc8e73ba62f910cde1863aba45d7a68025303d666
Next block: 450d319f379b3618a73091d6f3630f3244a302d59727b2bfc57c823410a5eea2
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074759
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: e7a27f23df31e3ad18e99ce74aa61d3bd70fa54dabea932e6d8a4b18eb2886a8
Median time: 1544074758
Difficulty: 4.656542373906925e-10
Confirmations: 47
Chainwork: 0000000000000000000000000000000000000000000000000000000000000138
Bits: 207fffff