Simpler key migration

A1.md

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+NIP-A1
+======
+
+Key Migration
+-------------
+
+`draft` `optional`
+
+This NIP offers a simple mechanism to evaluate and authenticate a key migration socially.
+
+Users publish kind `39` events when migrating to a new key (`p` tag).
+
+```yaml
+{
+  "kind": 39,
+  "pubkey": "<main pubkey>", // The old/main public key
+  "tags": [
+    ["p", "<new pubkey>"] // The new public key
+  ],
+  content: "",
+  // Other fields
+}
+```
+
+Kind `39` events are either a legitimate migration and should be accepted, or a phishing attempt 
+by an attacker, which should be rejected, and the main key unfollowed.
+
+[NIP-22](22.md) comments SHOULD be used to debate if the event is legitimate. 
+
+Clients SHOULD offer Web of Trust signals to help users make a decision.
+
+Clients SHOULD emphasize off-line verification procedures when a kind `39` is found.
+
+Clients MAY offer easy functions to switch the user's follow lists to the new public key and 
+revert the transaction if necessary.