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. mxMfLjAez

Height: 2312
Hash: 6e2d61d032af9e88d56a0135c99337999165d10b64a13a14691fdd935596180d
Previous block: 6e3686ca46e2e87cdd617f30dbee89c3228bf61796f7d1ea2eff8cc70f442d4a
Next block: 11b0eda35adca9098a50b3207bd9b4b9a9cb014c1648661fe8fdb56174f49b22
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1743847272
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 7b1f524b0e8df7751e381f4231e9b05455ba907b5933c7e5ea13cdefed07ad5e
Median time: 1743847271
Difficulty: 4.656542373906925e-10
Confirmations: 331
Chainwork: 0000000000000000000000000000000000000000000000000000000000001212
Bits: 207fffff