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: 4
Hash: 68cbfe12f35226e2e5c9f2955e29391e918e8a55bf21c99da1f8a02b5c9e3811
Previous block: 42bd39bcaf97dce5f62aa6c54f82377724a77a6d50228df35c8d91d495824bf7
Next block: 66474786c9acac43105951648370eaa9da8598c7c54327215bb58adae967ecf4
Weight: 904
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1544074734
Stripped size: 226
Size: 226
Nonce: 3
Merkle root: 77b95cf23c0e3d6cfcfa552655cb1e864b1a5a8a410d8c6f8ddcdd38bcf86a06
Median time: 1544074733
Difficulty: 4.656542373906925e-10
Confirmations: 198
Chainwork: 000000000000000000000000000000000000000000000000000000000000000a
Bits: 207fffff