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23 lines
1.2 KiB
Markdown
23 lines
1.2 KiB
Markdown
# NIP-1078
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## Arbitrary custom app data
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`draft` `optional` `author:BlowaterNostr`
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## Nostr event
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This NIP specifies the use of event kind `1078` which is almost identical to [30078](https://github.com/nostr-protocol/nips/blob/master/78.md) except that it's not a replacible event.
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## Some use cases
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The reason to not having a 30078 is that some clients want to implement local state changes as [CRDTs](https://crdt.tech/), meaning support cumulative and associative mutations
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Cumulative and associative means the order of applying operations doesn't change the final result as long as the same set of operations are applied.
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Using regular events can reserve the event/operation history thus the client can recompute the final state easily. [Figma uses CRDT to implement their vector design system.](https://www.figma.com/blog/how-figmas-multiplayer-technology-works/)
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## Implementations
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For example, in [Blowater](https://blowater.deno.dev), Pin/Unpin Contacts is implemented as regular events to achieve better consistency.
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Event set [`Pin Npub X`, `Unpin NpubX`, `Pin Npub Y`] will result in a pin list of `[Y]` no matter how the order is shifted.
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Many other operations are best implemented as CRDTs as well.
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