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: 603
Hash: 2ab836ee065e9189911c7eb7acddbd27211e2464a575bf426cde1829be6e894c
Previous block: 72fae21fda6d33b653a989e755df01ac53a87e64f660377ba2e6425e59863a5f
Next block:
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711429
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: cbe65d058145a3085cba5a5a3ec7eabb83a689cc0f8cd9a09aaffac89bf2f3cb
Median time: 1564711429
Difficulty: 4.656542373906925e-10
Confirmations: 1
Chainwork: 00000000000000000000000000000000000000000000000000000000000004b8
Bits: 207fffff