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: 177
Hash: 311cf811e6b1f9fdf2c790ff7ebd1239b266a988271681b98efff31850ebeb86
Previous block: 205c40da644a8eb71235684bdf3e94af54e7431a5d6a711482d32686b2ec7cc0
Next block: 333366dde8d264e55a636dadb7f221ded59e384f5f6b64f0f3fb158a37859a07
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074763
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: a8a3b74e9ae98d098d9c60c80540c9cc7fe815eab5adca6f1628b9a39b72c59d
Median time: 1544074762
Difficulty: 4.656542373906925e-10
Confirmations: 25
Chainwork: 0000000000000000000000000000000000000000000000000000000000000164
Bits: 207fffff