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: 1691
Hash: 4b653ea8ed9335386bf85ddfb4ec0ec9634e3ec7de692559f9fd7cfceb30cbda
Previous block: 51ed509f4be448e3c4a03654710973f56df38be91993786997f15caaa4de2218
Next block: 1ea8414ca5bfb8bf9a92c0665bc6630b863b8b495ac4ed2389430bfb7d4f21a8
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1719159205
Stripped size: 218
Size: 254
Nonce: 2
Merkle root: 6e9bea5155dd78fb8f1b720a29deb9e0258251b68ae78a27294b7f5f0a897cc2
Median time: 1719159204
Difficulty: 4.656542373906925e-10
Confirmations: 553
Chainwork: 0000000000000000000000000000000000000000000000000000000000000d38
Bits: 207fffff