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: 561
Hash: 395e51585c5890844c6e71e7c56792a35d2d76b4da2df7034b2cc428effc6ebd
Previous block: 5684b70447ead4dc25fe4baf3018569e15dfbb4d878504e3357df488e112e799
Next block: 7b6737df228c2798ae8b1bb0915ed7f5ec4aea5c138a4416c85c76f10f8b7c29
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864237
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 8b3254512a224ec213a5453776e7944ea50f74b6ecbfea6c23c0a71c6332a1ae
Median time: 1701864236
Difficulty: 4.656542373906925e-10
Confirmations: 1683
Chainwork: 0000000000000000000000000000000000000000000000000000000000000464
Bits: 207fffff