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: 602
Hash: 72fae21fda6d33b653a989e755df01ac53a87e64f660377ba2e6425e59863a5f
Previous block: 330f542b93c87028a889c7f9c62d7ed6bfc60f839c0324ef65224594aea7a81e
Next block: 2ab836ee065e9189911c7eb7acddbd27211e2464a575bf426cde1829be6e894c
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711429
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: 8272a76c44ec29e78b8e57b1d8abfd25ddaaf820cbe5f7cede0210395049b2a5
Median time: 1564711428
Difficulty: 4.656542373906925e-10
Confirmations: 2
Chainwork: 00000000000000000000000000000000000000000000000000000000000004b6
Bits: 207fffff