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: 479
Hash: 196ee2356240873f55c048fb8efd4aabc142d6840a1d52dd833773d9a8e4e46c
Previous block: 0c43ef2906f6f91ea0bfd9e70d5c4522eb6975368713862db338099ecbcc073c
Next block: 2b948f486a75e134989ce7a34af0472e0fb3634a2a93fb728d25f3365207b659
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864223
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 81032dfd246c47904ab7684a7d14566ca43136a950890c2fc60cc765b5d672d8
Median time: 1701864222
Difficulty: 4.656542373906925e-10
Confirmations: 1765
Chainwork: 00000000000000000000000000000000000000000000000000000000000003c0
Bits: 207fffff