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: 198
Hash: 2f4c72c5e7aaa638a4cf4619ae5de12487f5ea830b5f977e81d09bfc468252b5
Previous block: 3b7eff6da5c9ddd3782607eea3bdd1916459fc0908be7ee38df579b3d01b48f3
Next block: 337e42ffa966003161b6c6aaf002f16d33e0ac3fcf18efbe14a885125cd67e02
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074766
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: b4bd20068c436007ec690ae9e57c6dc7a9e2bc81c70ccb45d12c934d7337f6da
Median time: 1544074765
Difficulty: 4.656542373906925e-10
Confirmations: 4
Chainwork: 000000000000000000000000000000000000000000000000000000000000018e
Bits: 207fffff