Blockchain transaction validation

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On depositing their ETH, the own attestations to ensure their part of a block that but not in every slot.

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Tracking Bitcoin Transactions (Forensics) - Programmer explains
Transaction validation is the process of verifying that a transaction is valid and that it has been correctly included. Blockchain Validators?? ?A Blockchain Validator is someone who is responsible for verifying transactions within a blockchain. In the Bitcoin. Every transaction added to the chain will be verified by the nodes that are part of the network. This process is known as either proof of work.