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

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Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mressCpnG

Height: 2
Hash: 2a77dece0972d68761622e956d4f3e1411788d701293258b4ce931c787b8eb7d
Previous block: 373fdc3edf1c7c854a7aafa97e0fb94f45634d54505fa26a7610aa0089b00d19
Next block: 42bd39bcaf97dce5f62aa6c54f82377724a77a6d50228df35c8d91d495824bf7
Weight: 904
Versionhex: 20000000
Version: 536870912
Time: 1544074733
Stripped size: 226
Size: 226
Nonce: 2
Merkle root: f95edd827588493b7c170c5813a1884202570291492c03e0750c0fb868320003
Median time: 1544074732
Difficulty: 4.656542373906925e-10
Confirmations: 200
Chainwork: 0000000000000000000000000000000000000000000000000000000000000006
Bits: 207fffff