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: 1523
Hash: 0ddb323dc01d6f19417d3817d6418d7de59b154259cfe9d38367db645a72d61f
Previous block: 42336eb91b1cfebee1ac211e2b26dd08c5424b208d57b39f95df33e657b13f89
Next block: 38c844d4414ab3fb7f95bd5a055497a10d8090ad61fa5224f5035f006c431c78
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1718697661
Stripped size: 218
Size: 254
Nonce: 2
Merkle root: 9b98ae2a02a5f0e936c2bc6d32001c755b56e1478bb90c57a0478ebf63b0ee9e
Median time: 1718697660
Difficulty: 4.656542373906925e-10
Confirmations: 721
Chainwork: 0000000000000000000000000000000000000000000000000000000000000be8
Bits: 207fffff