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: 574
Hash: 66d9a050f2383095ea4bfc5d31d5919d6ca5fa9187368c2ee0a4af5bba754f28
Previous block: 7a25d873a321d187fcee5d00ed788d636d4a99912652651344fb752ddfec1d4b
Next block: 60eb90fec2f79aa8dbc03b4a7d647cdc3e26b55b9bb739becc5484d45744983a
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711425
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: 2ead4a5297e09485eae8fb5007d2f31fc4ab23fe90f5ba6ea61dc791c42c2027
Median time: 1564711424
Difficulty: 4.656542373906925e-10
Confirmations: 30
Chainwork: 000000000000000000000000000000000000000000000000000000000000047e
Bits: 207fffff