Cache all the things

packages/system/src/impl/nip46.ts

@@ -63,6 +63,10 @@ export class Nip46Signer implements EventSigner {
     this.#insideSigner = insideSigner ?? new PrivateKeySigner(secp256k1.utils.randomPrivateKey());
   }
 
+  get supports(): string[] {
+    return ["nip04"]
+  }
+
   get relays() {
     return [this.#relay];
   }

packages/system/src/impl/nip7.ts

@@ -21,6 +21,10 @@ declare global {
 }
 
 export class Nip7Signer implements EventSigner {
+  get supports(): string[] {
+    return ["nip04"];
+  }
+  
   init(): Promise<void> {
     return Promise.resolve();
   }