Hi @crypto.piotr.

I believe blockchain should be understood literally as a block chain.

• Blocks are a collection of data whose role is to describe an element or event.
• The chain is the block-binding part, the common part.
• Cryptographic records and a distributed data recording scheme in a decentralized form are used to secure information in the blockchain.
  *Decentralized means there is no one place where all data is stored.