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: 1619
Hash: 025313e1674e5d25a4c96bf173bac9c572d264e842086f5ebd29b59551a8efdb
Previous block: 5a438cd74f95235ee4cd5bd33c7f827312fec23475ebd82a6f947d929c53b2df
Next block: 353beda755ed8f61c556e3e51f414866af2e3786f4d5e534b69876237a83daf2
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1719159193
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 20742c6633743964fa22cc473094db4b85d2c86f1f5000b3adb14bc6a87d6f17
Median time: 1719159192
Difficulty: 4.656542373906925e-10
Confirmations: 625
Chainwork: 0000000000000000000000000000000000000000000000000000000000000ca8
Bits: 207fffff