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: 640
Hash: 61411a290e1961fee10ed0be6212ea9352ea449772f44c1f81edc3b98d1c61ba
Previous block: 2b1a3461e478e105d95c0e93af0cfee57ba571ede126cfd428afcfc3031587ac
Next block: 139bd4ccff0dae9e4d72b9ab0cfbd9c348f5f3ceb1fc378aecad74d97c209838
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864250
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 4201a613e57616d950b999155b57d9e1943c7b89199e77e072073b900e1a5c16
Median time: 1701864249
Difficulty: 4.656542373906925e-10
Confirmations: 1604
Chainwork: 0000000000000000000000000000000000000000000000000000000000000502
Bits: 207fffff