The Blockchain is the underlying technology supporting digital currencies like Bitcoin; it’s a decentralized platform that securely processes transactions through encryption
Since this technology cannot be owned by any one person, company, or entity, and each user has the ability to view or access the state of Blockchain at any given time. Blockchain has become increasingly lauded as a new underlying protocol and infrastructure to do new and revolutionary functions that have a great impact on business, industry, government, and potentially society. A notable basis to the protocol, the security and verifiability of data and its transfer is achieved using mathematically designed cryptosystems.
Miners, as they are called, who are a network of computers forming a validated consensus of the state of the Blockchain, are scattered all over the globe. This network, by nature and design is decentralized and crypto-economically incentivized to be resilient to attacks. The decentralized consensus nature of Blockchains (in this case Bitcoin) renders them almost impossible to break at its core. As an attacker or group of attackers would require the computational hashing power of a nation state and all the tech companies there in to overcome the more than 51% computational power of the network.