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 github.com/pdxrod/blockchain_explorer.

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Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mkrgsKuFE

Height: 567
Hash: 2873406e00ae89bd8043f2b837b06587d4c16217186617bc65a6657a3614e2ff
Previous block: 14aac7aa76d3a848837a164dacdfa4bfdd0343a86628bbfab55de3d7457a3874
Next block: 5b03d6c77a120c04de9c1ccc0ef99c0a6cd598ba2a67075a56e091b5c40ba2cd
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711423
Stripped size: 228
Size: 264
Nonce: 4
Merkle root: 6ee534bfb2cb6fa21cba0f3e69d02b30081721ef27f48aa854cb3b73f431c845
Median time: 1564711423
Difficulty: 4.656542373906925e-10
Confirmations: 37
Chainwork: 0000000000000000000000000000000000000000000000000000000000000470
Bits: 207fffff