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: 579
Hash: 7ceee3f634edf9c17af5958bd019e90e6c77db4502d479dc0c02f5086f9a6da6
Previous block: 5d37077f88f169bcb1b7ed60f2e62731c0249fd9ecf4798bd415e1d5b85d23e9
Next block: 322b388883853ad04770793905ea782dab76c6f73e57bfb3e4cd44639a0ac06d
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711425
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: 99fa266a25352ef6b755580fd83a15dc8b6a7b3cc4cf3f652d571c73baf81b57
Median time: 1564711425
Difficulty: 4.656542373906925e-10
Confirmations: 25
Chainwork: 0000000000000000000000000000000000000000000000000000000000000488
Bits: 207fffff