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What are the practical use cases of anonymous events in Solidity? In which situations they might be helpful?

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At the low level all events are quite similar: an optional topics array with a maximum of 4 entries and a data array of arbitrary length. Topics are 32 bytes in length and they are indexed in the block bloom filter.

Solidity events use one of the topics for the event identifier. So the only advantage of anonymous events is that they may have 4 topics.

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