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: 823
Hash: 1bc27956e5bd871eae44f1816f54a59d6882dc466c107332fb69ed3382021f16
Previous block: 5dd4ca0ada3a034eeaf23a96afa16498a7dd11d66e8b849d274612b403c82205
Next block: 4f29591d2dc14c987797f427a208c0805819667a59a07587555f338e20962f01
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1707857806
Stripped size: 218
Size: 254
Nonce: 2
Merkle root: 6f725438c7f2cc10396e08f281bea75910d80f3413efab1c91859aba7ad8bef8
Median time: 1707857805
Difficulty: 4.656542373906925e-10
Confirmations: 1421
Chainwork: 0000000000000000000000000000000000000000000000000000000000000670
Bits: 207fffff