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. mressCpnG

Height: 156
Hash: 450d319f379b3618a73091d6f3630f3244a302d59727b2bfc57c823410a5eea2
Previous block: 524866b891c17e675b11e694e9ab7b4f7e07057feaa7765e2f9a503932c3180b
Next block: 44845e55c535a55025abb64eb5256037c5e9cabb0b019069b9f7e4738830137c
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074759
Stripped size: 228
Size: 228
Nonce: 2
Merkle root: 7376239a25ecf2a8f86b6f1715791b920ad12a50a0b6f51e40fd0673eec26be6
Median time: 1544074758
Difficulty: 4.656542373906925e-10
Confirmations: 46
Chainwork: 000000000000000000000000000000000000000000000000000000000000013a
Bits: 207fffff