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. mxMfLjAez

Height: 213
Hash: 204b1728b72d87737f4c1ae8fb3b04a92f0d2ef6924b93973ef58ef6ab614d40
Previous block: 011b43067324a5097c5043f73e409d950b576ea8726c1b62ab9149fdd95aa014
Next block: 710ccbc1a38c6f0deb45a21dd674af35fd1c8c80a205936aae92fceefe25458c
Weight: 872
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1701597903
Stripped size: 218
Size: 218
Nonce: 3
Merkle root: 0753f3d5fc397105cf944822ff79b8c7f87574a6b72065b04db0f14198302624
Median time: 1701597902
Difficulty: 4.656542373906925e-10
Confirmations: 2031
Chainwork: 00000000000000000000000000000000000000000000000000000000000001ac
Bits: 207fffff