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: 150
Hash: 46c278829fe6996283f4b008f1015b19322f467f6f0a5509b43901234b6016e5
Previous block: 73fa82885a7c1f87f42912bc38f3b0b3ae09c650987bdd430be9e6a1a6191bf0
Next block: 08b73bc8a534127c3c035b1fbdd4d8a409ac0b0050f09c0bbe0b2e0e3b6e0b12
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074758
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: 7e0219a23fa0d2fea1bca22370504b77b4121b30e4a66ec0d37b8e6c341f0d8d
Median time: 1544074757
Difficulty: 4.656542373906925e-10
Confirmations: 52
Chainwork: 000000000000000000000000000000000000000000000000000000000000012e
Bits: 207fffff