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.

home    blocks

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

Height: 1621
Hash: 50ec08b123a0400aeafaaf2c0c1fbf50f1fd938cfb1ce82aafbc846fe041460e
Previous block: 353beda755ed8f61c556e3e51f414866af2e3786f4d5e534b69876237a83daf2
Next block: 047339964cde67cfe1ffb3fd3aa4944a8d98dbbf98574f4918c83cbe2ded2ef7
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1719159193
Stripped size: 218
Size: 254
Nonce: 2
Merkle root: 0ef4bc01ec90f0bff6feca9811ee37753789b50894a2852b4784972d2ac70ee4
Median time: 1719159193
Difficulty: 4.656542373906925e-10
Confirmations: 623
Chainwork: 0000000000000000000000000000000000000000000000000000000000000cac
Bits: 207fffff