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: 559
Hash: 44831f74f62aae6eb772eb7448b00af6734dc1f1fab1fd6d38fc692cda003552
Previous block: 6665a530ab60e4d159367b7733949473ceefea9ca8f0d38da3f3ad1f821b2d04
Next block: 3b47b7d077a8dccd5f428c0ed62865b3d9d933a167d4d2b04301b8eff702b35e
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711422
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: 5d44a99a7306d4a351a4664fa229237c1097de839e5bc81fc859efe2d31f0d95
Median time: 1564711421
Difficulty: 4.656542373906925e-10
Confirmations: 45
Chainwork: 0000000000000000000000000000000000000000000000000000000000000460
Bits: 207fffff