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.

home    blocks

Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mxMfLjAez

Height: 137
Hash: 6ef138b4a316fe1d3895ce10fc2b8011ccfd528536bc0c158a17eed421e3403a
Previous block: 57723276ad2201329a809f05230acffb578da52f6f408b96f8b375bde75f1b4b
Next block: 4691d19cf4abb76a0bfec876a12ffc176c222292b3062b43206b2a5ea80d011f
Weight: 872
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701597890
Stripped size: 218
Size: 218
Nonce: 0
Merkle root: 0e938f52d64b9b83b88ada6d3265a5c77e17e79b95bcc480d7ef4f083ed91fe6
Median time: 1701597889
Difficulty: 4.656542373906925e-10
Confirmations: 2107
Chainwork: 0000000000000000000000000000000000000000000000000000000000000114
Bits: 207fffff