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: 721
Hash: 0f95ede96426fe1357aa565ba3af9b7094ba875dc853e7198a37514906ce429b
Previous block: 76f553c97ecfa434734ab2396760336b66b6ed37664ce2f5e28446a0c0912af9
Next block: 16f52bc49e162536802a74c32ea408a3e921db3692c3c38e5eae987b24fb769a
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864264
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 20b664b2c76819edd3b5b76c0a3c257609ccae9f630d1f02adb6cb616ea87c1c
Median time: 1701864263
Difficulty: 4.656542373906925e-10
Confirmations: 1523
Chainwork: 00000000000000000000000000000000000000000000000000000000000005a4
Bits: 207fffff