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: 153
Hash: 1ea853419e02580f1c8b78eb534927a00457157b43e116c480188560df40247e
Previous block: 5e86091d53fbcdad9521d0df117c399d4cfbad144355d8be3b82639a333d0844
Next block: 4490bb17d9c6e0d1fd04b26bc8e73ba62f910cde1863aba45d7a68025303d666
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074759
Stripped size: 228
Size: 228
Nonce: 2
Merkle root: 2b552922d1c7df147b1322de4ef88b58b969303d4417b5b1deca26cf8df8bcd9
Median time: 1544074758
Difficulty: 4.656542373906925e-10
Confirmations: 49
Chainwork: 0000000000000000000000000000000000000000000000000000000000000134
Bits: 207fffff