The NIP (Nostrum Improvement Protocol) is a protocol that allows for the replacement of events in a blockchain network. The latest version, NIP-33, adds new features such as the ability to replace events by kind and event range, which allows for the replacement of events that have the same `d` tag and kind. It also defines a parameterized replaceable event as an event with a kind between 30000 and 40000. Upon receiving a newer timestamped event than the currently known latest replaceable event with the same kind, author, and first `d` tag value, the old event SHOULD be discarded, effectively replacing what gets returned when querying for `author:kind:d-tag` tuples. If two events have the same timestamp, the event with the lowest id (first in lexical order) SHOULD be retained, and the other discarded. A missing or a `d` tag with no value should be interpreted equivalent to a `d` tag with the value as an empty string. Events from the same author with any of the following `tags` replace each other:

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Link: https://github.com/nostr-protocol/nips/blob/master/33.md