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. mkrgsKuFE

Height: 581
Hash: 05f40d7470e1b6a7bc699a5e6d5b39796c23f211b59461793a7c05f75f52d2de
Previous block: 322b388883853ad04770793905ea782dab76c6f73e57bfb3e4cd44639a0ac06d
Next block: 28428158c8d6915e128c510a5b12cbc5d801b91433a8126ed5e1198736b20de8
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711426
Stripped size: 228
Size: 264
Nonce: 3
Merkle root: 801acb9181d46af4a9a1ae588d85a97e1caef7ec4c3fa13affd2aed6f882aedd
Median time: 1564711425
Difficulty: 4.656542373906925e-10
Confirmations: 23
Chainwork: 000000000000000000000000000000000000000000000000000000000000048c
Bits: 207fffff