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: 208
Hash: 749ba259f0b71a44a7b825f21997acd7c36141c4a22afaa7f64cc5dcfcda131a
Previous block: 466ac61419808dc3bfa4bdb620de89d53c8a8e408ffb403b17f64bb4d602c5b3
Next block: 43729dfa287429e56076af2e67b6a5d5f6c972b22b0f65904ded0af78af8538e
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1564711364
Stripped size: 228
Size: 228
Nonce: 2
Merkle root: 1c06905c05fcb80d72cb52fe4f21613c50e6f4e91122c2bf814dfe7729b5bc80
Median time: 1564711363
Difficulty: 4.656542373906925e-10
Confirmations: 396
Chainwork: 00000000000000000000000000000000000000000000000000000000000001a2
Bits: 207fffff