The block can be found in blockchain technology which contains a data like cryptographic hash from the previous block, a timestamp, and transaction data so that each block is resistant to data modification. Cryptographich hash is a math algorithm used to solve each hash in blocks. Here's an example block and take a look yourself what you can really find in a block - https://www.blockchain.com/btc/block/00000000000000000000a6aa810398698e60770f728f276185dbe0316e37cf5d.