This kind of mechanism makes it quite tough to tamper with the | 𝘾𝙔𝘽𝙀𝙍 𝙏𝘼𝙇𝙆 ™ 😷 𝗛𝗮𝗰𝗸𝗶𝗻𝗴 𝗧𝗼𝗼𝗹𝘀 . 𝙇𝙚𝙖𝙠𝙨 & 𝙈𝙤𝙧𝙚

This kind of mechanism makes it quite tough to tamper with the blocks, so even if you tamper with even a single block, you will need to recalculate the proof-of-work for all the following blocks. Thus, hashing and proof-of-work mechanisms make a blockchain secure.