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: 564
Hash: 3f4f60d898e23840690ce2ad2a54d515d1a17adddcb6f6058fbf3e5e20edaec4
Previous block: 0dfff6dcaf35e61bb134de7cfbeea6e835148d490b2a8f1d6cf70233bae4f5a1
Next block: 13ae25c106ed2c0e3fecd30327e540966697dbc6c2ed4052e7c4b0fbe9cf1f02
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711423
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: f3399455cf37011266b3274c96469177a6e8be6d5ef9d86c7be023497b18beee
Median time: 1564711422
Difficulty: 4.656542373906925e-10
Confirmations: 40
Chainwork: 000000000000000000000000000000000000000000000000000000000000046a
Bits: 207fffff