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: 1639
Hash: 4042d39d367f86fb6b31e880c119fdc6247598199aac0b9cc64e27f1a5069e07
Previous block: 2885b1ead60527b42894d5dbea388662f8733c4f269600f23156806229099966
Next block: 7ddfb0bcc23a4cf58646d01283d3b30912b596a6dca7bcc2a7881ff2606d591d
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1719159196
Stripped size: 218
Size: 254
Nonce: 2
Merkle root: f8eaf3bf897406841d0089d0baef283a6958785225f869e2d30d0e18b117a589
Median time: 1719159196
Difficulty: 4.656542373906925e-10
Confirmations: 605
Chainwork: 0000000000000000000000000000000000000000000000000000000000000cd0
Bits: 207fffff