diff --git a/packages/lto-did-provider/src/__tests__/lto-did-provider.test.ts b/packages/lto-did-provider/src/__tests__/lto-did-provider.test.ts
index 514ff2d29..885513767 100644
--- a/packages/lto-did-provider/src/__tests__/lto-did-provider.test.ts
+++ b/packages/lto-did-provider/src/__tests__/lto-did-provider.test.ts
@@ -8,7 +8,7 @@ const PRIVATE_KEY_HEX =
   'ea6aaeebe17557e0fe256bfce08e8224a412ea1e25a5ec8b5d69618a58bad89e89a4661e446b46401325a38d3b20582d1dd277eb448a3181012a671b7ae15837'
 const PUBLIC_KEY_HEX = '89a4661e446b46401325a38d3b20582d1dd277eb448a3181012a671b7ae15837'
 const LTO_DID = 'did:lto:3MzYSqyo8GBMsY8u8F2WEuoVXYuq6hnKzyj'
-const LTO_KID = `${LTO_DID}#key`
+const LTO_KID = `${LTO_DID}#sign`
 const SPONSOR_PRIVATE_KEY_BASE58 = '5gqCU5NbwU4gc62be39LXDDALKj8opj1KZszx7ULJc2k33kk52prn8D1H2pPPwm6QVKvkuo72YJSoUhzzmAFmDH8'
 const LTO_KEY = {
   kid: LTO_KID,
@@ -120,7 +120,7 @@ describe('@sphereon/lto-did-provider', () => {
         },
         mockContext
       )
-    ).resolves.toEqual(`did:lto:${address}#key`)
+    ).resolves.toEqual(`did:lto:${address}#sign`)
 
     // jest.resetAllMocks();
   })
diff --git a/packages/lto-did-provider/src/lto-did-provider.ts b/packages/lto-did-provider/src/lto-did-provider.ts
index e5c984f20..79380a34c 100644
--- a/packages/lto-did-provider/src/lto-did-provider.ts
+++ b/packages/lto-did-provider/src/lto-did-provider.ts
@@ -112,10 +112,10 @@ export class LtoDidProvider extends AbstractIdentifierProvider {
           })
         }
 
-        // The #key constant for the controller key is set in stone on the LTO Network
+        // The #sign constant for the controller key is set in stone on the LTO Network
         const identifier: Omit<IIdentifier, 'provider'> = {
           did,
-          controllerKeyId: `${did}#key`,
+          controllerKeyId: `${did}#sign`,
           keys,
           services: [],
         }
@@ -149,7 +149,7 @@ export class LtoDidProvider extends AbstractIdentifierProvider {
         verificationMethod: args.options.verificationMethod,
         createVerificationDID: true,
       })
-      .then((account) => `did:lto:${account.address}#key`)
+      .then((account) => `did:lto:${account.address}#sign`)
   }
 
   removeKey(args: { identifier: IIdentifier; kid: string; options?: any }, context: IAgentContext<IKeyManager>): Promise<any> {
@@ -179,7 +179,7 @@ export class LtoDidProvider extends AbstractIdentifierProvider {
       ? await context.agent.keyManagerImport({
           kms: kms || this.defaultKms,
           publicKeyHex: didAccount ? base58ToHex(didAccount.getPublicSignKey()) : undefined,
-          kid: didAccount ? `did:lto:${didAccount.address}#key` : undefined,
+          kid: didAccount ? `did:lto:${didAccount.address}#sign` : undefined,
           type: keyType || 'Ed25519',
           privateKeyHex,
         })