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.

home    blocks

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

Height: 576
Hash: 3410a7378f5b5aad714be9827a6257fddff8963930c134d502825ea3e61d1a9b
Previous block: 60eb90fec2f79aa8dbc03b4a7d647cdc3e26b55b9bb739becc5484d45744983a
Next block: 7b685d2bbbdf54342439a79cca6c70d807b802b3dc49260b8c5c7dbdc9c6a624
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711425
Stripped size: 228
Size: 264
Nonce: 3
Merkle root: 6da847c8ad857b0c3a6730dddd1f505846e9deeb541a312b073c8b4485362d84
Median time: 1564711424
Difficulty: 4.656542373906925e-10
Confirmations: 28
Chainwork: 0000000000000000000000000000000000000000000000000000000000000482
Bits: 207fffff