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: 569
Hash: 547f39a6352c753e5d17aaabdb63e0f64a86963ec53655ed97e3479f6fa4f48d
Previous block: 5b03d6c77a120c04de9c1ccc0ef99c0a6cd598ba2a67075a56e091b5c40ba2cd
Next block: 609c11d6a880bf5047b5a0674238ef416ea534c3ad8911950e46baa793cd622e
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711424
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: e8605283e04eed28a1ccb19241569342ac678000bba162eaf185b047b2f0aa90
Median time: 1564711423
Difficulty: 4.656542373906925e-10
Confirmations: 35
Chainwork: 0000000000000000000000000000000000000000000000000000000000000474
Bits: 207fffff