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: 600
Hash: 0763b15017c0386986b290d697b28f905230db8d0dfe6454c4d7363abf989f8e
Previous block: 06801ff77d4c999d7e00f19ac5a6cad9a9529983865860808396a8dfc822aaba
Next block: 330f542b93c87028a889c7f9c62d7ed6bfc60f839c0324ef65224594aea7a81e
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711429
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: f77de1d61ea717fd5919c6d1cf1399986db7f5d0a6ba043f0f779df4e8fa0a91
Median time: 1564711428
Difficulty: 4.656542373906925e-10
Confirmations: 4
Chainwork: 00000000000000000000000000000000000000000000000000000000000004b2
Bits: 207fffff