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: 491
Hash: 6ff181d9451d3d93a776062678cea88328e2f63b71f00751ac34cde62e10e8af
Previous block: 15e80a9c9b33f3c383f8572ddddc2a603d2b4fc5aecb9b6fcb5a70498a767ade
Next block: 31072a0f281c8d98b5cf397304c6d40e0bbbf030ff4851846e3999d69621e2bd
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864225
Stripped size: 218
Size: 254
Nonce: 1
Merkle root: 932011321616b404759050a8b5617ab6a3446f0c96ef7f414d8547fbdff4e4eb
Median time: 1701864224
Difficulty: 4.656542373906925e-10
Confirmations: 1753
Chainwork: 00000000000000000000000000000000000000000000000000000000000003d8
Bits: 207fffff