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.

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Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mkrgsKuFE

Height: 1580
Hash: 76b9bede89331c9ceb9ff9ce7bd701c442df8bead52e939d65495efb5a9b79dd
Previous block: 0157e6d0d4d058cf353912d7a3cf22e4d697c620583d9aa381da409722368a49
Next block: 34d63f2e494435656eefaf3b145cfaa7d56321149ba5e20639c3e87e96168f42
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1708932133
Stripped size: 218
Size: 254
Nonce: 1
Merkle root: f5b2cbba2000a31fb2332e3a50f20b8231368f65543673e5a9a43c1ef1226f7d
Median time: 1708932132
Difficulty: 4.656542373906925e-10
Confirmations: 29
Chainwork: 0000000000000000000000000000000000000000000000000000000000000c5a
Bits: 207fffff