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: 667
Hash: 4c6b7b3499a3b9fb6e4d12de72ed9c23ffdcbbab261c7b069e47fd8c08a22af0
Previous block: 5a0404fc36a43e0b3b8d3d7ccb6b6e1c43a8a42eddd2ee58e94e8f3bb2711025
Next block: 593b176f3adaf08f4cf1d5cff21122006939a1aedabb8796c81c09ade44ab2eb
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864255
Stripped size: 218
Size: 254
Nonce: 1
Merkle root: ff4ce28a124aadd9c26d60150f4fe56092110b31aa99239528be69584c220d27
Median time: 1701864254
Difficulty: 4.656542373906925e-10
Confirmations: 1577
Chainwork: 0000000000000000000000000000000000000000000000000000000000000538
Bits: 207fffff