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: 159
Hash: 5167796ecfd89ba4c301ed19cc2f8fb8b21438b1170c64566bd04c53f8f197bd
Previous block: 0575cff4e0f503d437235279a6c411f0e6abb581575cd04ecbdb8be9ecd74183
Next block: 01ea4a80cc1d410d9f7c975fc41ec3a4dd6270cf8cba73d440cd5e15620ef1dc
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074760
Stripped size: 228
Size: 228
Nonce: 1
Merkle root: 8424cffb9af88b6baa5cbd6c8c5df5784bf052f0dae31a48127642e67cad3c45
Median time: 1544074759
Difficulty: 4.656542373906925e-10
Confirmations: 43
Chainwork: 0000000000000000000000000000000000000000000000000000000000000140
Bits: 207fffff