All the collected chains form a blockchain

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Imagine walking into a recruitment and education theme park. At the entrance, everyone is eq Netherlands Phone Numbers 10 Million List uipped with a tape recorder that is always on, constantly recording the announcements heard in the park: Oksana Semenova took the course Financial Analysis: Modern Tools and Solutions for Effective Management; Ivan Petrov passed the entrance test: IPFM: Financial Management; Peter Gavrilov passed the assessment: Developing company budgets, etc.

Each such ad is a transaction. Ad groups are structured chains of transactions.  - a block of chain (originally English block chain). Other visitors carrying tape recorders were witnesses. Situation: Someone, let's call him Mikhail, insidiously recorded an announcement on a tape recorder with a fake voice and pretended to have successfully completed the course Risk Management: Risk Assessment, Methodology and Management.