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: 144
Hash: 6ffefae56998f8418255356af48aa5802e7c3c7f85f89d33093e4772cdf9ebfd
Previous block: 0898542a5d43e2d2b323ae534368e77bb7e1dcf0c53d7acb100ae0c72ac88e3b
Next block: 5fa96b429289b0eb9009e51b26d2856dbedc79ca4eb089450f95df2a24b25768
Weight: 872
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1701597891
Stripped size: 218
Size: 218
Nonce: 1
Merkle root: 221f564518d5138348d92860fd33a9c8877402c46fc05f3503f74ef4cbd0530e
Median time: 1701597890
Difficulty: 4.656542373906925e-10
Confirmations: 2100
Chainwork: 0000000000000000000000000000000000000000000000000000000000000122
Bits: 207fffff