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: 197
Hash: 3b7eff6da5c9ddd3782607eea3bdd1916459fc0908be7ee38df579b3d01b48f3
Previous block: 584925d01c9571be187c0fae5bf12b55bb0011aa01eaecddedc749600c46296c
Next block: 2f4c72c5e7aaa638a4cf4619ae5de12487f5ea830b5f977e81d09bfc468252b5
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074766
Stripped size: 228
Size: 228
Nonce: 2
Merkle root: b17d2a61a580f5c06efa4852db168726fbc9d81011e338dac3739574e66296db
Median time: 1544074765
Difficulty: 4.656542373906925e-10
Confirmations: 5
Chainwork: 000000000000000000000000000000000000000000000000000000000000018c
Bits: 207fffff