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. mzaGu

Height: 575
Hash: 60eb90fec2f79aa8dbc03b4a7d647cdc3e26b55b9bb739becc5484d45744983a
Previous block: 66d9a050f2383095ea4bfc5d31d5919d6ca5fa9187368c2ee0a4af5bba754f28
Next block: 3410a7378f5b5aad714be9827a6257fddff8963930c134d502825ea3e61d1a9b
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711425
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: 38202b8aee8d186e2eb853af196aa63e4bb7e67cfe470baa9c58f1d6b4c81eb6
Median time: 1564711424
Difficulty: 4.656542373906925e-10
Confirmations: 29
Chainwork: 0000000000000000000000000000000000000000000000000000000000000480
Bits: 207fffff