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: 3
Hash: 42bd39bcaf97dce5f62aa6c54f82377724a77a6d50228df35c8d91d495824bf7
Previous block: 2a77dece0972d68761622e956d4f3e1411788d701293258b4ce931c787b8eb7d
Next block: 68cbfe12f35226e2e5c9f2955e29391e918e8a55bf21c99da1f8a02b5c9e3811
Weight: 904
Versionhex: 20000000
Version: 536870912
Time: 1544074733
Stripped size: 226
Size: 226
Nonce: 0
Merkle root: 7e359757566aa47b6f3a471ca2ef102a11c366d1684375b276b100a89183bf70
Median time: 1544074733
Difficulty: 4.656542373906925e-10
Confirmations: 199
Chainwork: 0000000000000000000000000000000000000000000000000000000000000008
Bits: 207fffff