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: 597
Hash: 3510ca7f0c5d35a60a374585f709e904bf650327f78faa1df1c02fb314595e4c
Previous block: 517104ad64b752cf4724268efe6e042722f55712895dd9406a3a4509ec641d7c
Next block: 2b39ad43db0c1ce51d498c56ec92d151dab5118bc09c753230d2604563e15055
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711428
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: 5808d9e17e99fab268aee58fc86304411ca3691599a7b52c9eee5db4a572670d
Median time: 1564711428
Difficulty: 4.656542373906925e-10
Confirmations: 7
Chainwork: 00000000000000000000000000000000000000000000000000000000000004ac
Bits: 207fffff