What are announcements?

This question was asked at chia_network.public on Keybase.

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Announcements aren’t something you subscribe to, but rather a puzzle can announce something on the block as the coin is being spent, which can then be asserted by another coin in the same spend bundle. This allows coins to require each other to exist to be able to be spent. For example, this is how you would implement a payment while changing the owner of an NFT.

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