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To check that a block is valid on a blockchain, need have a . The ID of the block owner and its public key.O b

To check that a block is valid on a blockchain, need have a

.

The ID of the block owner and its public key.O b

.

The ID of the block owner and its public key as well as the access to the previous block. c

.

The ID of the block owner and its private key.

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