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: 151
Hash: 08b73bc8a534127c3c035b1fbdd4d8a409ac0b0050f09c0bbe0b2e0e3b6e0b12
Previous block: 46c278829fe6996283f4b008f1015b19322f467f6f0a5509b43901234b6016e5
Next block: 5e86091d53fbcdad9521d0df117c399d4cfbad144355d8be3b82639a333d0844
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074758
Stripped size: 228
Size: 228
Nonce: 2
Merkle root: bb54108cbb716adeb51d8e1514347cbfc52ad1ac8204b5421f1172f84b4e4c00
Median time: 1544074758
Difficulty: 4.656542373906925e-10
Confirmations: 51
Chainwork: 0000000000000000000000000000000000000000000000000000000000000130
Bits: 207fffff