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: 1643
Hash: 4eec641bacc7575756dbdbbd3d7360af94ef7163b9ce8bde33737de85068bd96
Previous block: 4a7fe03e0fbb2c339e85a71615700987974db123b49a8caaba6b0d3ed88390ab
Next block: 50cafbeb0c3479949fddadb3d760410f78afc6c537135a887344bd497c373746
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1719159197
Stripped size: 218
Size: 254
Nonce: 4
Merkle root: 444489635c6815af1cef0650017b34828f7a895ab134e44fb5ac7f8b8723f8a8
Median time: 1719159196
Difficulty: 4.656542373906925e-10
Confirmations: 601
Chainwork: 0000000000000000000000000000000000000000000000000000000000000cd8
Bits: 207fffff