diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 7ef2658e51..378c215b6c 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -265,6 +265,24 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}
 
 		if (this.utilityService.isKeyWordIncluded(data.cw ?? data.text ?? '', meta.prohibitedWords)) {
+			const { DiscordWebhookUrl } = (await this.metaService.fetch());
+
+			if (DiscordWebhookUrl) {
+				const data_disc = { 'username': 'ノートブロックお知らせ',
+																								'content':
+						'ユーザー名 :' + user.username + '\n' +
+						'url : ' + user.host + '\n' +
+						'contents : ' + data.text,
+				};
+
+				await fetch(DiscordWebhookUrl, {
+					'method': 'post',
+					headers: {
+						'Content-Type': 'application/json',
+					},
+					body: JSON.stringify(data_disc),
+				});
+			}
 			throw new NoteCreateService.ContainsProhibitedWordsError();
 		}
 
diff --git a/packages/backend/src/server/api/SignupApiService.ts b/packages/backend/src/server/api/SignupApiService.ts
index 01ca4ff612..38585b3888 100644
--- a/packages/backend/src/server/api/SignupApiService.ts
+++ b/packages/backend/src/server/api/SignupApiService.ts
@@ -75,14 +75,6 @@ export class SignupApiService {
 
 		const instance = await this.metaService.fetch(true);
 
-		if (instance.enableProxyCheckio) {
-			if (instance.proxyCheckioApiKey == null) throw new FastifyReplyError(400, 'PROXY_CHECKIO_API_KEY_NOT_SET');
-			const proxyCheck = new ProxyCheck({ api_key: instance.proxyCheckioApiKey });
-			const result = await proxyCheck.check(request.headers['x-real-ip'] ?? request.ip, {
-				vpn: 1,
-			});
-			if (result[request.headers['x-real-ip'] ?? request.ip].proxy === 'yes') throw new FastifyReplyError(400, 'PROXY_DETECTED');
-		}
 		// Verify *Captcha
 		// ただしテスト時はこの機構は障害となるため無効にする
 		if (process.env.NODE_ENV !== 'test') {
@@ -117,6 +109,24 @@ export class SignupApiService {
 		const invitationCode = body['invitationCode'];
 		const emailAddress = body['emailAddress'];
 
+		const { DiscordWebhookUrl } = (await this.metaService.fetch());
+		if (DiscordWebhookUrl) {
+			const data_disc = { 'username': 'ユーザー登録お知らせ',
+																							'content':
+					'ユーザー名 :' + username + '\n' +
+					'メールアドレス : ' + emailAddress + '\n' +
+					'IPアドレス : ' + request.headers['x-real-ip'] ?? request.ip,
+			};
+
+			await fetch(DiscordWebhookUrl, {
+				'method': 'post',
+				headers: {
+					'Content-Type': 'application/json',
+				},
+				body: JSON.stringify(data_disc),
+			});
+		}
+
 		if (instance.emailRequiredForSignup) {
 			if (emailAddress == null || typeof emailAddress !== 'string') {
 				reply.code(400);