add nip22: unacceptable event created_at field

1 files changed, 23 insertions, 0 deletions

diff --git a/22.md b/22.md
new file mode 100644
index 0000000..1cd2120
--- /dev/null
+++ b/22.md
@@ -0,0 +1,23 @@
+NIP-22
+======
+
+Unacceptable Event `created_at` time
+---------------------------
+
+`draft` `optional` `author:jeffthibault`
+
+Relays may support notifying clients that the event they published has an unacceptable `created_at` time. A relay will will consider the `created_at` time unacceptable if the `created_at` time is more than **[limit]** before the event was received by the relay. 
+
+If a relay supports this NIP, the relay SHOULD send the client a `NOTICE` message saying the event was not stored because the timestamp was too old.
+
+Client Behavior
+---------------
+
+Clients SHOULD use the `supported_nips` field to learn if a relay supports event `created_at` checks.
+
+Motivation
+----------
+
+The motivation for this NIP is to prevent clients from saying they published an event *significantly* earlier than they actually did.
+
+The event `created_at` field is just a unix timestamp (integer) so one could set it to a time in the past. For example, the `created_at` field could be set to a time 10 years ago even though it was created today and it could still be a valid event. This NIP aims to set a maximum amount of time elapsed between when an event was created and when it was *actually* published.