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: 689
Hash: 6ed8e4049dde45170a91c1c470ecb87d90159ef64a4f64d5e2b1ca846d5a8845
Previous block: 30f56e19d06f257db8836213adafcc068be0d5e3bb602afe080e469c05d6c2a6
Next block: 67c86ebbe5954ceb5d84fd8e7ceb11b0fce40848cd3f05f33f8201103f0b03f7
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1701864258
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: f9121c020af0b944c17e1b8791d21f0b0cec9bb6321245ca5ac93daed91911cb
Median time: 1701864257
Difficulty: 4.656542373906925e-10
Confirmations: 1555
Chainwork: 0000000000000000000000000000000000000000000000000000000000000564
Bits: 207fffff