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: 8
Hash: 256c455c56470d774a40294c33b7b76c7a764d7bf7ae115b5144e42d0bc77453
Previous block: 3f46a2df37bce0b13d1eda674b56d1474922a080fb814b62192da0d26c40c46a
Next block: 2686c3ead93913895589587bbe93b5e5aefa0de66a3d3a26094226fd8f83dc75
Weight: 904
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1544074735
Stripped size: 226
Size: 226
Nonce: 0
Merkle root: 6cf3ab4dec0333251fb98d39d0417f8ca47706b3f95f760827028f9ebb29aef6
Median time: 1544074734
Difficulty: 4.656542373906925e-10
Confirmations: 194
Chainwork: 0000000000000000000000000000000000000000000000000000000000000012
Bits: 207fffff