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: 643
Hash: 0ef9dccd225ddea726f6614f922574a089954d898093916df44eb5bbda10436e
Previous block: 749496cc784bebd08164dcd4b95b1d3ae549491741c79a0ca7173e48f8a4eb90
Next block: 5cb401b2f2f23135549775a97f83bb211ca0565bdc54b788d12419e0bb49e17a
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864251
Stripped size: 218
Size: 254
Nonce: 2
Merkle root: 65011ef392d00bb2e7f01fabf4853b16e06f234809e7477f1b63adc4493a0aa2
Median time: 1701864250
Difficulty: 4.656542373906925e-10
Confirmations: 1601
Chainwork: 0000000000000000000000000000000000000000000000000000000000000508
Bits: 207fffff