diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 515ea62af4..4ed4d992c4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -217,8 +217,8 @@ jobs:
 
       - name: Set Operator Account
         run: |
-          echo "OPERATOR_KEY=${{ steps.solo.outputs.ed25519PrivateKey }}" >> $GITHUB_ENV
-          echo "OPERATOR_ID=${{ steps.solo.outputs.ed25519AccountId }}" >> $GITHUB_ENV
+          echo "OPERATOR_KEY=${{ steps.solo.outputs.ecdsaPrivateKey }}" >> $GITHUB_ENV
+          echo "OPERATOR_ID=${{ steps.solo.outputs.ecdsaAccountId }}" >> $GITHUB_ENV
           echo "HEDERA_NETWORK=local-node" >> $GITHUB_ENV
 
       - name: Install dependencies
diff --git a/examples/.env b/examples/.env
index ebba785a91..845e42428e 100644
--- a/examples/.env
+++ b/examples/.env
@@ -1,6 +1,6 @@
 # Local Node 
-OPERATOR_KEY=0xa608e2130a0a3cb34f86e757303c862bee353d9ab77ba4387ec084f881d420d4
-OPERATOR_ID=0.0.1022
+OPERATOR_KEY=0x105d050185ccb907fba04dd92d8de9e32c18305e097ab41dadda21489a211524
+OPERATOR_ID=0.0.1012
 HEDERA_NETWORK=local-node
 
 NODE_COMMAND=node
\ No newline at end of file
diff --git a/examples/account-alias.js b/examples/account-alias.js
index c98c63e598..bd6be5c580 100644
--- a/examples/account-alias.js
+++ b/examples/account-alias.js
@@ -58,7 +58,7 @@ async function main() {
 
     console.log('"Creating" a new account');
 
-    const privateKey = PrivateKey.generateED25519();
+    const privateKey = PrivateKey.generateECDSA();
     const publicKey = privateKey.publicKey;
 
     // Assuming that the target shard and realm are known.
diff --git a/examples/account-allowance.js b/examples/account-allowance.js
index 0715a75e5f..2c2c565319 100644
--- a/examples/account-allowance.js
+++ b/examples/account-allowance.js
@@ -40,9 +40,9 @@ async function main() {
 
     console.log("Generating accounts for example...");
 
-    const aliceKey = PrivateKey.generateED25519();
-    const bobKey = PrivateKey.generateED25519();
-    const charlieKey = PrivateKey.generateED25519();
+    const aliceKey = PrivateKey.generateECDSA();
+    const bobKey = PrivateKey.generateECDSA();
+    const charlieKey = PrivateKey.generateECDSA();
 
     try {
         let transaction = await new AccountCreateTransaction()
diff --git a/examples/account-create-with-hts.js b/examples/account-create-with-hts.js
index a378b6467d..f465bcc73e 100644
--- a/examples/account-create-with-hts.js
+++ b/examples/account-create-with-hts.js
@@ -47,14 +47,13 @@ async function main() {
     const supplyKey = PrivateKey.generateECDSA();
     const freezeKey = PrivateKey.generateECDSA();
     const wipeKey = PrivateKey.generateECDSA();
-
     if (process.env.OPERATOR_ID == null || process.env.OPERATOR_KEY == null) {
         throw new Error(
             "Environment variables OPERATOR_ID, and OPERATOR_KEY are required.",
         );
     }
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const nodes = {
         "127.0.0.1:50211": new AccountId(3),
diff --git a/examples/batch-tx.js b/examples/batch-tx.js
index b8c5dc4ae7..a74ea48c66 100644
--- a/examples/batch-tx.js
+++ b/examples/batch-tx.js
@@ -32,7 +32,7 @@ async function main() {
     }
 
     const operatorAccId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorPrivKey = PrivateKey.fromStringED25519(
+    const operatorPrivKey = PrivateKey.fromStringECDSA(
         process.env.OPERATOR_KEY,
     );
 
diff --git a/examples/change-or-remove-token-keys.js b/examples/change-or-remove-token-keys.js
index a8b9d4f005..d00dde20c3 100644
--- a/examples/change-or-remove-token-keys.js
+++ b/examples/change-or-remove-token-keys.js
@@ -33,7 +33,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
@@ -41,14 +41,14 @@ async function main() {
     const infoLogger = new Logger(LogLevel.Info);
     client.setLogger(infoLogger);
 
-    const adminKey = PrivateKey.generateED25519();
-    const supplyKey = PrivateKey.generateED25519();
-    const newSupplyKey = PrivateKey.generateED25519();
-    const wipeKey = PrivateKey.generateED25519();
-    const freezeKey = PrivateKey.generateED25519();
-    const pauseKey = PrivateKey.generateED25519();
-    const feeScheduleKey = PrivateKey.generateED25519();
-    const metadataKey = PrivateKey.generateED25519();
+    const adminKey = PrivateKey.generateECDSA();
+    const supplyKey = PrivateKey.generateECDSA();
+    const newSupplyKey = PrivateKey.generateECDSA();
+    const wipeKey = PrivateKey.generateECDSA();
+    const freezeKey = PrivateKey.generateECDSA();
+    const pauseKey = PrivateKey.generateECDSA();
+    const feeScheduleKey = PrivateKey.generateECDSA();
+    const metadataKey = PrivateKey.generateECDSA();
 
     // This HIP introduces ability to remove lower-privilege keys (Wipe, KYC, Freeze, Pause, Supply, Fee Schedule, Metadata) from a Token:
     // - using an update with the empty KeyList;
diff --git a/examples/consensus-pub-sub.js b/examples/consensus-pub-sub.js
index ac0113b741..bac5abf4fe 100644
--- a/examples/consensus-pub-sub.js
+++ b/examples/consensus-pub-sub.js
@@ -27,7 +27,7 @@ async function main() {
 
     client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringDer(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     try {
diff --git a/examples/contract-nonces.js b/examples/contract-nonces.js
index a7e7fa2947..e0bb0fc1cb 100644
--- a/examples/contract-nonces.js
+++ b/examples/contract-nonces.js
@@ -36,7 +36,7 @@ async function main() {
     try {
         const fileCreateTxResponse = await (
             await new FileCreateTransaction()
-                .setKeys([PrivateKey.fromStringDer(process.env.OPERATOR_KEY)])
+                .setKeys([PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY)])
                 .setContents(SMART_CONTRACT_BYTECODE)
                 .setMaxTransactionFee(new Hbar(2))
                 .freezeWithSigner(wallet)
@@ -48,7 +48,9 @@ async function main() {
 
         const contractCreateTxResponse = await (
             await new ContractCreateTransaction()
-                .setAdminKey(PrivateKey.fromStringDer(process.env.OPERATOR_KEY))
+                .setAdminKey(
+                    PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
+                )
                 .setGas(100000)
                 .setBytecodeFileId(newFileId)
                 .setContractMemo(
diff --git a/examples/create-account-with-alias-and-receiver-signature.js b/examples/create-account-with-alias-and-receiver-signature.js
index 3cd507f744..93b1361e1f 100644
--- a/examples/create-account-with-alias-and-receiver-signature.js
+++ b/examples/create-account-with-alias-and-receiver-signature.js
@@ -15,7 +15,7 @@ dotenv.config();
 /*
 Reference: [HIP-583 Expand alias support in CryptoCreate & CryptoTransfer Transactions](https://hips.hedera.com/hip/hip-583)
     ## Example 1:
-    - Create an ECSDA private key and an ED25519 admin private key
+    - Create an ECSDA private key and an ECDSA admin private key
     - Extract the ECDSA public key
     - Extract the Ethereum public address
     - Use the `AccountCreateTransaction`
@@ -32,7 +32,7 @@ async function main() {
         );
     }
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const nodes = {
         "127.0.0.1:50211": new AccountId(3),
@@ -47,9 +47,9 @@ async function main() {
         /**
          * Step 1
          *
-         * Create an ECSDA private key and an ED25519 admin private key
+         * Create an ECSDA private key and an ECDSA admin private key
          */
-        const adminKey = PrivateKey.generateED25519();
+        const adminKey = PrivateKey.generateECDSA();
         console.log(`Admin private key: ${adminKey.toStringDer()}`);
 
         const privateKey = PrivateKey.generateECDSA();
diff --git a/examples/create-account-with-alias.js b/examples/create-account-with-alias.js
index 248955b7e5..7b71708380 100644
--- a/examples/create-account-with-alias.js
+++ b/examples/create-account-with-alias.js
@@ -30,7 +30,7 @@ async function main() {
         );
     }
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const nodes = {
         "127.0.0.1:50211": new AccountId(3),
@@ -193,7 +193,7 @@ async function main() {
          *
          * Create an account key and an ECSDA private alias key
          */
-        const key = PrivateKey.generateED25519();
+        const key = PrivateKey.generateECDSA();
         const aliasKey = PrivateKey.generateECDSA();
         console.log(`Alias key: ${aliasKey.toStringDer()}`);
 
@@ -341,7 +341,7 @@ async function main() {
          *
          * Create an account key and an derive an ECSDA public alias key
          */
-        const key = PrivateKey.generateED25519();
+        const key = PrivateKey.generateECDSA();
         const aliasKey = PrivateKey.generateECDSA();
         const publicAliasKey = aliasKey.publicKey;
 
diff --git a/examples/create-account-with-thresholdkey.js b/examples/create-account-with-thresholdkey.js
index 1f5655d110..4f7267f380 100644
--- a/examples/create-account-with-thresholdkey.js
+++ b/examples/create-account-with-thresholdkey.js
@@ -33,7 +33,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     //  Create the client based on the HEDERA_NETWORK environment variable
     const client = Client.forName(process.env.HEDERA_NETWORK);
@@ -56,7 +56,7 @@ async function main() {
         const privateKeys = [];
         const publicKeys = [];
         for (let i = 0; i < 3; i++) {
-            const key = PrivateKey.generateED25519();
+            const key = PrivateKey.generateECDSA();
             privateKeys.push(key);
             publicKeys.push(key.publicKey);
         }
diff --git a/examples/create-topic-with-revenue.js b/examples/create-topic-with-revenue.js
index 881125c8b8..58087bef68 100644
--- a/examples/create-topic-with-revenue.js
+++ b/examples/create-topic-with-revenue.js
@@ -31,7 +31,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         operatorId,
diff --git a/examples/create-update-delete-node.js b/examples/create-update-delete-node.js
index 35fa83d1ee..b06dfd5a89 100644
--- a/examples/create-update-delete-node.js
+++ b/examples/create-update-delete-node.js
@@ -25,7 +25,7 @@ async function main() {
 
     const network = process.env.HEDERA_NETWORK;
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
     // Transaction parameters
diff --git a/examples/demo-umd/demo.html b/examples/demo-umd/demo.html
index 9a23ebbf18..21d29fe832 100644
--- a/examples/demo-umd/demo.html
+++ b/examples/demo-umd/demo.html
@@ -37,7 +37,7 @@ <h1>Hiero UMD Builder</h1>
             <div class="json-container" ></div>
             <img src="bouncing-circles.svg" class="loading" />
             <div class="execute-notice">
-                You should use an ED25519 key for the operator. The network set
+                You should use an ECDSA key for the operator. The network set
                 is TESTNET.
             </span>
         </main>
diff --git a/examples/demo-umd/main.js b/examples/demo-umd/main.js
index 330c363b48..3f3bb4ca3d 100644
--- a/examples/demo-umd/main.js
+++ b/examples/demo-umd/main.js
@@ -23,7 +23,7 @@ function executeTx() {
 
     // setup client and operator
     const operatorId = sdk.AccountId.fromString(operatorIdValue);
-    const operatorKey = sdk.PrivateKey.fromStringED25519(operatorKeyValue);
+    const operatorKey = sdk.PrivateKey.fromStringECDSA(operatorKeyValue);
     const client = sdk.Client.forTestnet().setOperator(operatorId, operatorKey);
 
     // start loading until the query is executed
diff --git a/examples/ecrecover-example.js b/examples/ecrecover-example.js
index 497d6cf004..245c3ad806 100644
--- a/examples/ecrecover-example.js
+++ b/examples/ecrecover-example.js
@@ -38,7 +38,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const client = Client.forLocalNode().setOperator(operatorId, operatorKey);
 
     console.log(`Operator account: ${operatorId.toString()}`);
diff --git a/examples/ecrecover-mirror-node-example.js b/examples/ecrecover-mirror-node-example.js
index ec56707a54..bd9e79b506 100644
--- a/examples/ecrecover-mirror-node-example.js
+++ b/examples/ecrecover-mirror-node-example.js
@@ -33,7 +33,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const client = Client.forLocalNode().setOperator(operatorId, operatorKey);
 
     console.log(`Operator account: ${operatorId.toString()}`);
diff --git a/examples/error-handling-example.js b/examples/error-handling-example.js
index 2009da2803..5af490cbdf 100644
--- a/examples/error-handling-example.js
+++ b/examples/error-handling-example.js
@@ -32,12 +32,12 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(process.env.HEDERA_NETWORK);
     client.setOperator(operatorId, operatorKey);
 
-    const newKey = PrivateKey.generateED25519();
+    const newKey = PrivateKey.generateECDSA();
     console.log(`Generated new public key: ${newKey.publicKey.toString()}`);
     let accountId = null;
 
diff --git a/examples/error-handling-single-node-execution.js b/examples/error-handling-single-node-execution.js
index 958154ddfd..a8c37b933f 100644
--- a/examples/error-handling-single-node-execution.js
+++ b/examples/error-handling-single-node-execution.js
@@ -33,7 +33,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(process.env.HEDERA_NETWORK);
     client.setOperator(operatorId, operatorKey);
diff --git a/examples/exempt-custom-fees.js b/examples/exempt-custom-fees.js
index d4a6f1bd7d..116d16140a 100644
--- a/examples/exempt-custom-fees.js
+++ b/examples/exempt-custom-fees.js
@@ -44,7 +44,7 @@ async function main() {
     }
     // Configure accounts and client, and generate needed keys
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const provider = new LocalProvider();
 
@@ -58,7 +58,7 @@ async function main() {
      * Create accounts A, B, and C
      */
 
-    let firstAccountPrivateKey = PrivateKey.generateED25519();
+    let firstAccountPrivateKey = PrivateKey.generateECDSA();
     let firstAccountPublicKey = firstAccountPrivateKey.publicKey;
 
     let createAccountAtx = await new AccountCreateTransaction()
@@ -77,7 +77,7 @@ async function main() {
         provider,
     );
 
-    let secondAccountPrivateKey = PrivateKey.generateED25519();
+    let secondAccountPrivateKey = PrivateKey.generateECDSA();
     let secondAccountPublicKey = secondAccountPrivateKey.publicKey;
 
     let createAccountBtx = await new AccountCreateTransaction()
@@ -96,7 +96,7 @@ async function main() {
         provider,
     );
 
-    let thirdAccountPrivateKey = PrivateKey.generateED25519();
+    let thirdAccountPrivateKey = PrivateKey.generateECDSA();
     let thirdAccountPublicKey = thirdAccountPrivateKey.publicKey;
 
     let createAccountCtx = await new AccountCreateTransaction()
diff --git a/examples/frontend-examples/src/app/client/async-client/page.js b/examples/frontend-examples/src/app/client/async-client/page.js
index 9ac3410104..0ef9b79f78 100644
--- a/examples/frontend-examples/src/app/client/async-client/page.js
+++ b/examples/frontend-examples/src/app/client/async-client/page.js
@@ -56,7 +56,9 @@ const ClientProvider = ({ children }) => {
             // Set operator for the client
             newClient.setOperator(
                 AccountId.fromString(process.env.NEXT_PUBLIC_OPERATOR_ID),
-                PrivateKey.fromStringDer(process.env.NEXT_PUBLIC_OPERATOR_KEY),
+                PrivateKey.fromStringECDSA(
+                    process.env.NEXT_PUBLIC_OPERATOR_KEY,
+                ),
             );
 
             setClient(newClient);
@@ -176,7 +178,7 @@ const AsyncClientDemo = () => {
 
         setIsActionLoading(true);
         try {
-            const privateKey = PrivateKey.generateED25519();
+            const privateKey = PrivateKey.generateECDSA();
             const publicKey = privateKey.publicKey;
 
             const transaction = await new AccountCreateTransaction()
diff --git a/examples/frontend-examples/src/app/client/grpc-web-proxy/page.js b/examples/frontend-examples/src/app/client/grpc-web-proxy/page.js
index a3428d7587..c1527ef6af 100644
--- a/examples/frontend-examples/src/app/client/grpc-web-proxy/page.js
+++ b/examples/frontend-examples/src/app/client/grpc-web-proxy/page.js
@@ -41,7 +41,7 @@ const Home = () => {
     const client = useMemo(() => {
         return WebClient.forNetwork(initialNetwork).setOperator(
             AccountId.fromString(process.env.NEXT_PUBLIC_OPERATOR_ID),
-            PrivateKey.fromStringDer(process.env.NEXT_PUBLIC_OPERATOR_KEY),
+            PrivateKey.fromStringECDSA(process.env.NEXT_PUBLIC_OPERATOR_KEY),
         );
     }, []);
 
@@ -80,7 +80,7 @@ const Home = () => {
         setIsLoading(true);
         try {
             console.log(client.network);
-            const privateKey = PrivateKey.generateED25519();
+            const privateKey = PrivateKey.generateECDSA();
             const publicKey = privateKey.publicKey;
 
             const transaction = await new AccountCreateTransaction()
diff --git a/examples/frontend-examples/src/app/components/TopicListener.js b/examples/frontend-examples/src/app/components/TopicListener.js
index 119cb8ef36..13fa716ad4 100644
--- a/examples/frontend-examples/src/app/components/TopicListener.js
+++ b/examples/frontend-examples/src/app/components/TopicListener.js
@@ -1,5 +1,5 @@
 import EventEmitter from "events";
-import { useEffect, useState } from "react";
+import { useEffect, useState, useRef } from "react";
 
 const TopicListener = ({ topicId }) => {
     const [messages, setMessages] = useState([]);
diff --git a/examples/frontend-examples/src/app/topic/message-query/page.js b/examples/frontend-examples/src/app/topic/message-query/page.js
index cbd32fc4cc..84e700e61b 100644
--- a/examples/frontend-examples/src/app/topic/message-query/page.js
+++ b/examples/frontend-examples/src/app/topic/message-query/page.js
@@ -22,7 +22,7 @@ const MessageQueryPage = () => {
 
     // Setup Hedera client
     const accountId = AccountId.fromString(process.env.NEXT_PUBLIC_OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(
+    const operatorKey = PrivateKey.fromStringECDSA(
         process.env.NEXT_PUBLIC_OPERATOR_KEY,
     );
     const client = Client.forTestnet().setOperator(accountId, operatorKey);
diff --git a/examples/frontend-examples/src/app/transaction/jumbo/page.js b/examples/frontend-examples/src/app/transaction/jumbo/page.js
index 95bd75ab7e..fea0443405 100644
--- a/examples/frontend-examples/src/app/transaction/jumbo/page.js
+++ b/examples/frontend-examples/src/app/transaction/jumbo/page.js
@@ -32,7 +32,7 @@ const JumboPage = () => {
     const operatorId = AccountId.fromString(
         process.env.NEXT_PUBLIC_OPERATOR_ID,
     );
-    const operatorKey = PrivateKey.fromStringED25519(
+    const operatorKey = PrivateKey.fromStringECDSA(
         process.env.NEXT_PUBLIC_OPERATOR_KEY,
     );
     const [contractId, setContractId] = useState("0.0.6255191");
diff --git a/examples/frontend-examples/src/app/transaction/size/page.js b/examples/frontend-examples/src/app/transaction/size/page.js
index 3dd88a09c1..b7dc324143 100644
--- a/examples/frontend-examples/src/app/transaction/size/page.js
+++ b/examples/frontend-examples/src/app/transaction/size/page.js
@@ -18,7 +18,7 @@ const Home = () => {
 
     const client = WebClient.forTestnet().setOperator(
         AccountId.fromString(process.env.NEXT_PUBLIC_OPERATOR_ID),
-        PrivateKey.fromStringDer(process.env.NEXT_PUBLIC_OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.NEXT_PUBLIC_OPERATOR_KEY),
     );
 
     return (
@@ -48,7 +48,7 @@ const Home = () => {
                         const tx = new AccountCreateTransaction();
                         if (key) {
                             tx.setKeyWithoutAlias(
-                                PublicKey.fromStringED25519(key),
+                                PublicKey.fromStringECDSA(key),
                             );
                         }
                         if (initialBalance) {
diff --git a/examples/generate-key.js b/examples/generate-key.js
index 6bebd89802..60aa9e0fc5 100644
--- a/examples/generate-key.js
+++ b/examples/generate-key.js
@@ -6,7 +6,7 @@ async function main() {
         const mnemonic = await Mnemonic.generate();
         console.log(`24 words mnemonic = ${mnemonic.toString()}`);
 
-        const key = await mnemonic.toStandardEd25519PrivateKey("", 0);
+        const key = await mnemonic.toStandardECDSAsecp256k1PrivateKey("", 0);
         console.log(`private key = ${key.toString()}`);
         console.log(`public key = ${key.publicKey.toString()}`);
 
@@ -18,7 +18,7 @@ async function main() {
             mnemonic.toString(),
         );
         const recoveredRootKey =
-            await recoveredMnemonic.toStandardEd25519PrivateKey("", 0);
+            await recoveredMnemonic.toStandardECDSAsecp256k1PrivateKey("", 0);
 
         recoveredRootKey.toString() === key.toString()
             ? console.log(`successful key recovery!`)
@@ -27,7 +27,10 @@ async function main() {
         const mnemonic12 = await Mnemonic.generate12();
         console.log(`12 words mnemonic = ${mnemonic12.toString()}`);
 
-        const key12 = await mnemonic12.toStandardEd25519PrivateKey("", 0);
+        const key12 = await mnemonic12.toStandardECDSAsecp256k1PrivateKey(
+            "",
+            0,
+        );
         console.log(`private key = ${key12.toString()}`);
         console.log(`public key = ${key12.publicKey.toString()}`);
     } catch (error) {
diff --git a/examples/generate-txid-on-demand.js b/examples/generate-txid-on-demand.js
index a2fba85f54..f8d34ef4d4 100644
--- a/examples/generate-txid-on-demand.js
+++ b/examples/generate-txid-on-demand.js
@@ -49,7 +49,7 @@ async function main() {
         );
     }
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     let client;
 
diff --git a/examples/get-exchangerates.js b/examples/get-exchangerates.js
index 607ddc1d17..eabbff42fc 100644
--- a/examples/get-exchangerates.js
+++ b/examples/get-exchangerates.js
@@ -3,6 +3,7 @@ import {
     LocalProvider,
     FileContentsQuery,
     ExchangeRates,
+    PrivateKey,
 } from "@hashgraph/sdk";
 
 import dotenv from "dotenv";
@@ -22,11 +23,10 @@ async function main() {
 
     const provider = new LocalProvider();
 
-    const wallet = new Wallet(
-        process.env.OPERATOR_ID,
-        process.env.OPERATOR_KEY,
-        provider,
-    );
+    // Parse ECDSA key explicitly
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
+
+    const wallet = new Wallet(process.env.OPERATOR_ID, operatorKey, provider);
     let resp;
     try {
         resp = await new FileContentsQuery()
diff --git a/examples/get-file-contents.js b/examples/get-file-contents.js
index 7e175ef080..9fb9dd7f06 100644
--- a/examples/get-file-contents.js
+++ b/examples/get-file-contents.js
@@ -34,7 +34,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     //  Create the client based on the HEDERA_NETWORK environment variable
     const client = Client.forName(process.env.HEDERA_NETWORK);
diff --git a/examples/hts-nftP1-fee-create-mint-burn-associate-transfer.js b/examples/hts-nftP1-fee-create-mint-burn-associate-transfer.js
index db051033e6..11a094843e 100644
--- a/examples/hts-nftP1-fee-create-mint-burn-associate-transfer.js
+++ b/examples/hts-nftP1-fee-create-mint-burn-associate-transfer.js
@@ -29,7 +29,7 @@ dotenv.config();
 
 // Configure accounts and client, and generate needed keys
 const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 const nodes = {
     "127.0.0.1:50211": new AccountId(3),
 };
diff --git a/examples/hts-nftP2-kyc-upate-schedule.js b/examples/hts-nftP2-kyc-upate-schedule.js
index 85391e2d8b..3668d6ee96 100644
--- a/examples/hts-nftP2-kyc-upate-schedule.js
+++ b/examples/hts-nftP2-kyc-upate-schedule.js
@@ -33,7 +33,7 @@ dotenv.config();
 
 // Configure accounts and client, and generate needed keys
 const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 const nodes = {
     "127.0.0.1:50211": new AccountId(3),
 };
diff --git a/examples/hts-nftP3-pause-freeze-wipe-delete.js b/examples/hts-nftP3-pause-freeze-wipe-delete.js
index d71e5aeff1..0c458e4b06 100644
--- a/examples/hts-nftP3-pause-freeze-wipe-delete.js
+++ b/examples/hts-nftP3-pause-freeze-wipe-delete.js
@@ -39,7 +39,7 @@ dotenv.config();
 
 // Configure accounts and client, and generate needed keys
 const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 const nodes = {
     "127.0.0.1:50211": new AccountId(3),
 };
diff --git a/examples/initialize-client-with-mirror-node-adress-book.js b/examples/initialize-client-with-mirror-node-adress-book.js
index d7f67b324b..5119300d28 100644
--- a/examples/initialize-client-with-mirror-node-adress-book.js
+++ b/examples/initialize-client-with-mirror-node-adress-book.js
@@ -26,7 +26,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const accountKey = PrivateKey.generate();
 
diff --git a/examples/lazy-create-transfer-tx.js b/examples/lazy-create-transfer-tx.js
index 68589bcfb1..b4fb8cd93f 100644
--- a/examples/lazy-create-transfer-tx.js
+++ b/examples/lazy-create-transfer-tx.js
@@ -49,7 +49,7 @@ async function main() {
         );
     }
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const nodes = {
         "127.0.0.1:50211": new AccountId(3),
diff --git a/examples/legacy-way-sign-transaction.js b/examples/legacy-way-sign-transaction.js
index f38ec80946..304ca17181 100644
--- a/examples/legacy-way-sign-transaction.js
+++ b/examples/legacy-way-sign-transaction.js
@@ -10,7 +10,7 @@ import dotenv from "dotenv";
 dotenv.config();
 
 const OPERATOR_ID = AccountId.fromString(process.env.OPERATOR_ID);
-const OPERATOR_KEY = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+const OPERATOR_KEY = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 const HEDERA_NETWORK = process.env.HEDERA_NETWORK;
 
 async function main() {
@@ -19,7 +19,7 @@ async function main() {
     client.setOperator(OPERATOR_ID, OPERATOR_KEY);
 
     // Step 1: Generate private key for a future account create transaction
-    const key = PrivateKey.generateED25519();
+    const key = PrivateKey.generateECDSA();
 
     // Step 2: Create transaction without signing it
     const tx = new AccountCreateTransaction()
diff --git a/examples/logger-functionalities.js b/examples/logger-functionalities.js
index ea9109d010..e0cc0174c8 100644
--- a/examples/logger-functionalities.js
+++ b/examples/logger-functionalities.js
@@ -42,7 +42,7 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     let debugLogger = new Logger(LogLevel.Debug);
     let infoLogger = new Logger(LogLevel.Info);
@@ -60,7 +60,7 @@ async function main() {
 
     const wallet = new Wallet(client.operatorAccountId, operatorKey, provider);
 
-    const privateKey = PrivateKey.generateED25519();
+    const privateKey = PrivateKey.generateECDSA();
     const publicKey = privateKey.publicKey;
     const aliasAccountId = publicKey.toAccountId(0, 0);
 
diff --git a/examples/long-term-schedule-transaction.js b/examples/long-term-schedule-transaction.js
index 1305f43ea2..d9c1ae1db9 100644
--- a/examples/long-term-schedule-transaction.js
+++ b/examples/long-term-schedule-transaction.js
@@ -30,13 +30,13 @@ async function main() {
 
     // Step 0: Create and configure the SDK Client.
     const operatorId = process.env.OPERATOR_ID;
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const client = Client.forName(process.env.HEDERA_NETWORK || "testnet");
     client.setOperator(operatorId, operatorKey);
 
     // Step 1: Create key pairs
-    const privateKey1 = PrivateKey.generateED25519();
-    const privateKey2 = PrivateKey.generateED25519();
+    const privateKey1 = PrivateKey.generateECDSA();
+    const privateKey2 = PrivateKey.generateECDSA();
     const thresholdKey = new KeyList([
         privateKey1.publicKey,
         privateKey2.publicKey,
diff --git a/examples/mint-big-number-of-units-of-token.js b/examples/mint-big-number-of-units-of-token.js
index bf244fec65..40c0caf843 100644
--- a/examples/mint-big-number-of-units-of-token.js
+++ b/examples/mint-big-number-of-units-of-token.js
@@ -14,7 +14,7 @@ import dotenv from "dotenv";
 dotenv.config();
 
 async function main() {
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
diff --git a/examples/mirror-node-contract-queries-example.js b/examples/mirror-node-contract-queries-example.js
index 5595be2c97..be367b5940 100644
--- a/examples/mirror-node-contract-queries-example.js
+++ b/examples/mirror-node-contract-queries-example.js
@@ -18,7 +18,7 @@ import dotenv from "dotenv";
 dotenv.config();
 
 const OPERATOR_ID = AccountId.fromString(process.env.OPERATOR_ID);
-const OPERATOR_KEY = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+const OPERATOR_KEY = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 const HEDERA_NETWORK = process.env.HEDERA_NETWORK || "testnet";
 
 async function main() {
diff --git a/examples/multi-node-multi-signature-remove.js b/examples/multi-node-multi-signature-remove.js
index b2a5c1e60a..44cc2b966e 100644
--- a/examples/multi-node-multi-signature-remove.js
+++ b/examples/multi-node-multi-signature-remove.js
@@ -40,7 +40,7 @@ async function main() {
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringED25519(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     /**
@@ -179,7 +179,7 @@ const getAllSignaturesFromTransaction = (signedTransaction) => {
             transaction.sigMap.sigPair.forEach((sigPair) => {
                 if (sigPair.ed25519) {
                     signatures.push(
-                        PrivateKey.fromBytesED25519(
+                        PrivateKey.fromBytesECDSA(
                             sigPair.ed25519,
                         ).toStringDer(),
                     );
diff --git a/examples/multi-node-multi-signature-removeAll.js b/examples/multi-node-multi-signature-removeAll.js
index b546d9179d..8d111f5257 100644
--- a/examples/multi-node-multi-signature-removeAll.js
+++ b/examples/multi-node-multi-signature-removeAll.js
@@ -40,7 +40,7 @@ async function main() {
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringED25519(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     /**
@@ -177,7 +177,7 @@ const getAllSignaturesFromTransaction = (signedTransaction) => {
             transaction.sigMap.sigPair.forEach((sigPair) => {
                 if (sigPair.ed25519) {
                     signatures.push(
-                        PrivateKey.fromBytesED25519(
+                        PrivateKey.fromBytesECDSA(
                             sigPair.ed25519,
                         ).toStringDer(),
                     );
diff --git a/examples/multi-node-multi-signature.js b/examples/multi-node-multi-signature.js
index 6a6686058f..0738652f83 100644
--- a/examples/multi-node-multi-signature.js
+++ b/examples/multi-node-multi-signature.js
@@ -35,7 +35,7 @@ async function main() {
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringED25519(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     /**
@@ -161,7 +161,7 @@ const getAllSignaturesFromTransaction = (signedTransaction) => {
             transaction.sigMap.sigPair.forEach((sigPair) => {
                 if (sigPair.ed25519) {
                     signatures.push(
-                        PrivateKey.fromBytesED25519(
+                        PrivateKey.fromBytesECDSA(
                             sigPair.ed25519,
                         ).toStringDer(),
                     );
diff --git a/examples/multi-sig-offline.js b/examples/multi-sig-offline.js
index fa33b603cc..bf8fd8e3f6 100644
--- a/examples/multi-sig-offline.js
+++ b/examples/multi-sig-offline.js
@@ -32,7 +32,7 @@ async function main() {
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringDer(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     user1Key = PrivateKey.generate();
diff --git a/examples/nft-add-remove-allowances.js b/examples/nft-add-remove-allowances.js
index 9448a50e9f..ed80f7d6ab 100644
--- a/examples/nft-add-remove-allowances.js
+++ b/examples/nft-add-remove-allowances.js
@@ -42,7 +42,7 @@ async function main() {
         );
     }
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const nodes = {
         "127.0.0.1:50211": new AccountId(3),
     };
diff --git a/examples/node-client-async-testnet.js b/examples/node-client-async-testnet.js
index 7f6487aaa3..a03b7295e0 100644
--- a/examples/node-client-async-testnet.js
+++ b/examples/node-client-async-testnet.js
@@ -39,7 +39,7 @@ async function main() {
 
         // Set the operator for the client
         const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-        const operatorKey = PrivateKey.fromStringED25519(
+        const operatorKey = PrivateKey.fromStringECDSA(
             process.env.OPERATOR_KEY,
         );
         client.setOperator(operatorId, operatorKey);
@@ -79,7 +79,7 @@ async function main() {
         // Create a new account
         console.log("Creating a new account...");
         try {
-            const newKey = PrivateKey.generateED25519();
+            const newKey = PrivateKey.generateECDSA();
             console.log(`Generated new key pair:`);
             console.log(`   Private Key: ${newKey.toString()}`);
             console.log(`   Public Key: ${newKey.publicKey.toString()}`);
diff --git a/examples/react-native-example/App.tsx b/examples/react-native-example/App.tsx
index 83bc0fdce3..7f82b53c17 100644
--- a/examples/react-native-example/App.tsx
+++ b/examples/react-native-example/App.tsx
@@ -29,7 +29,7 @@ const styles = StyleSheet.create({
 
 const App = () => {
     const operatorId = AccountId.fromString(OPERATOR_ID);
-    const operatorKey = PrivateKey.fromString(OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(OPERATOR_KEY);
     const client = Client.forTestnet().setOperator(operatorId, operatorKey);
 
     const [transaction, setTransaction] = useState<TransactionResponse | null>(
diff --git a/examples/serialize-deserialize-1.js b/examples/serialize-deserialize-1.js
index 449646a6e7..d4e5e81750 100644
--- a/examples/serialize-deserialize-1.js
+++ b/examples/serialize-deserialize-1.js
@@ -30,7 +30,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
diff --git a/examples/serialize-deserialize-10.js b/examples/serialize-deserialize-10.js
index 4f7dee94e7..3d07c88ae5 100644
--- a/examples/serialize-deserialize-10.js
+++ b/examples/serialize-deserialize-10.js
@@ -29,7 +29,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const provider = new LocalProvider();
     const infoLogger = new Logger(LogLevel.Info);
diff --git a/examples/serialize-deserialize-11.js b/examples/serialize-deserialize-11.js
index 3ce285e3d5..0694bb2d8c 100644
--- a/examples/serialize-deserialize-11.js
+++ b/examples/serialize-deserialize-11.js
@@ -27,7 +27,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const provider = new LocalProvider();
     const infoLogger = new Logger(LogLevel.Info);
diff --git a/examples/serialize-deserialize-12.js b/examples/serialize-deserialize-12.js
index 58580a6594..4ffcbecec1 100644
--- a/examples/serialize-deserialize-12.js
+++ b/examples/serialize-deserialize-12.js
@@ -30,7 +30,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
diff --git a/examples/serialize-deserialize-2.js b/examples/serialize-deserialize-2.js
index 2508f77019..351db5a626 100644
--- a/examples/serialize-deserialize-2.js
+++ b/examples/serialize-deserialize-2.js
@@ -30,7 +30,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
diff --git a/examples/serialize-deserialize-3.js b/examples/serialize-deserialize-3.js
index 2fbba6fddb..5f272ca518 100644
--- a/examples/serialize-deserialize-3.js
+++ b/examples/serialize-deserialize-3.js
@@ -30,7 +30,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
diff --git a/examples/serialize-deserialize-4.js b/examples/serialize-deserialize-4.js
index 782482f588..3e5629a72e 100644
--- a/examples/serialize-deserialize-4.js
+++ b/examples/serialize-deserialize-4.js
@@ -30,7 +30,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
diff --git a/examples/serialize-deserialize-5.js b/examples/serialize-deserialize-5.js
index 8f37397d6b..c2b6cf383f 100644
--- a/examples/serialize-deserialize-5.js
+++ b/examples/serialize-deserialize-5.js
@@ -32,7 +32,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
diff --git a/examples/serialize-deserialize-6.js b/examples/serialize-deserialize-6.js
index 291b955446..2a1a5d5af1 100644
--- a/examples/serialize-deserialize-6.js
+++ b/examples/serialize-deserialize-6.js
@@ -30,7 +30,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
diff --git a/examples/serialize-deserialize-7.js b/examples/serialize-deserialize-7.js
index 8de89f3f8c..8684216b62 100644
--- a/examples/serialize-deserialize-7.js
+++ b/examples/serialize-deserialize-7.js
@@ -27,7 +27,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const provider = new LocalProvider();
     const infoLogger = new Logger(LogLevel.Info);
diff --git a/examples/serialize-deserialize-8.js b/examples/serialize-deserialize-8.js
index cd4ccf0bbd..3da09d3924 100644
--- a/examples/serialize-deserialize-8.js
+++ b/examples/serialize-deserialize-8.js
@@ -27,7 +27,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const provider = new LocalProvider();
     const infoLogger = new Logger(LogLevel.Info);
diff --git a/examples/serialize-deserialize-9.js b/examples/serialize-deserialize-9.js
index 079b425ae2..384f2a40cb 100644
--- a/examples/serialize-deserialize-9.js
+++ b/examples/serialize-deserialize-9.js
@@ -27,7 +27,7 @@ async function main() {
 
     // Configure client using environment variables
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const provider = new LocalProvider();
     const infoLogger = new Logger(LogLevel.Info);
diff --git a/examples/solidity-precompile-example.js b/examples/solidity-precompile-example.js
index e43d27f94c..6664d7dfbd 100644
--- a/examples/solidity-precompile-example.js
+++ b/examples/solidity-precompile-example.js
@@ -24,7 +24,7 @@ async function main() {
         provider,
     );
 
-    const operatorPrivateKey = hashgraph.PrivateKey.fromStringED25519(
+    const operatorPrivateKey = hashgraph.PrivateKey.fromStringECDSA(
         process.env.OPERATOR_KEY,
     );
     const operatorPublicKey = operatorPrivateKey.publicKey;
@@ -33,7 +33,7 @@ async function main() {
         process.env.OPERATOR_ID,
     );
 
-    const alicePrivateKey = hashgraph.PrivateKey.generateED25519();
+    const alicePrivateKey = hashgraph.PrivateKey.generateECDSA();
     const alicePublicKey = alicePrivateKey.publicKey;
 
     try {
diff --git a/examples/time-drift.js b/examples/time-drift.js
index 88b3b4b79d..98ce373416 100644
--- a/examples/time-drift.js
+++ b/examples/time-drift.js
@@ -54,7 +54,7 @@ async function main() {
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringDer(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     await sync();
diff --git a/examples/token-airdrop-example.js b/examples/token-airdrop-example.js
index 95a5334581..918fa1ee72 100644
--- a/examples/token-airdrop-example.js
+++ b/examples/token-airdrop-example.js
@@ -32,7 +32,7 @@ async function main() {
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringDer(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     const CID = [
@@ -66,7 +66,7 @@ async function main() {
             .execute(client)
     ).getReceipt(client);
 
-    const privateKey3 = PrivateKey.generateED25519();
+    const privateKey3 = PrivateKey.generateECDSA();
     const { accountId: accountId3 } = await (
         await new AccountCreateTransaction()
             .setKeyWithoutAlias(privateKey3)
diff --git a/examples/token-reject.js b/examples/token-reject.js
index 0de4e2232f..e062eea9c0 100644
--- a/examples/token-reject.js
+++ b/examples/token-reject.js
@@ -33,12 +33,12 @@ async function main() {
         "QmPzY5GxevjyfMUF5vEAjtyRoigzWp47MiKAtLBduLMC1T",
     ];
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const network = process.env.HEDERA_NETWORK;
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
     // create a treasury account
-    const treasuryPrivateKey = PrivateKey.generateED25519();
+    const treasuryPrivateKey = PrivateKey.generateECDSA();
     const treasuryAccountId = (
         await (
             await new AccountCreateTransaction()
@@ -49,7 +49,7 @@ async function main() {
     ).accountId;
 
     // create a receiver account with unlimited max auto associations
-    const receiverPrivateKey = PrivateKey.generateED25519();
+    const receiverPrivateKey = PrivateKey.generateECDSA();
     const receiverAccountId = (
         await (
             await new AccountCreateTransaction()
diff --git a/examples/topic-message-submit-get-all-chunks-status.js b/examples/topic-message-submit-get-all-chunks-status.js
index 0d979e28fd..56bae88b78 100644
--- a/examples/topic-message-submit-get-all-chunks-status.js
+++ b/examples/topic-message-submit-get-all-chunks-status.js
@@ -32,7 +32,7 @@ async function main() {
 
     const client = Client.forName(process.env.HEDERA_NETWORK).setOperator(
         AccountId.fromString(process.env.OPERATOR_ID),
-        PrivateKey.fromStringDer(process.env.OPERATOR_KEY),
+        PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY),
     );
 
     try {
diff --git a/examples/transfer-using-evm-address.js b/examples/transfer-using-evm-address.js
index f27f5f8989..33069377b1 100644
--- a/examples/transfer-using-evm-address.js
+++ b/examples/transfer-using-evm-address.js
@@ -41,7 +41,7 @@ async function main() {
         );
     }
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
 
     const nodes = {
         "127.0.0.1:50211": new AccountId(3),
diff --git a/examples/update-fungible-token-metadata-with-admin-key.js b/examples/update-fungible-token-metadata-with-admin-key.js
index c9031ea435..d1fb8a2941 100644
--- a/examples/update-fungible-token-metadata-with-admin-key.js
+++ b/examples/update-fungible-token-metadata-with-admin-key.js
@@ -25,12 +25,12 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const network = process.env.HEDERA_NETWORK;
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
     // Generate a admin key
-    const adminKey = PrivateKey.generateED25519();
+    const adminKey = PrivateKey.generateECDSA();
     // Initial metadata
     const metadata = new Uint8Array([1]);
     // New metadata
diff --git a/examples/update-fungible-token-metadata-with-metadata-key.js b/examples/update-fungible-token-metadata-with-metadata-key.js
index 99227d7d68..ced25b41ab 100644
--- a/examples/update-fungible-token-metadata-with-metadata-key.js
+++ b/examples/update-fungible-token-metadata-with-metadata-key.js
@@ -25,12 +25,12 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const network = process.env.HEDERA_NETWORK;
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
     // Generate a metadata key
-    const metadataKey = PrivateKey.generateED25519();
+    const metadataKey = PrivateKey.generateECDSA();
     // Initial metadata
     const metadata = new Uint8Array([1]);
     // New metadata
diff --git a/examples/update-nfts-metadata-of-non-fungible-token.js b/examples/update-nfts-metadata-of-non-fungible-token.js
index 0c38f6713b..c7756a7cfc 100644
--- a/examples/update-nfts-metadata-of-non-fungible-token.js
+++ b/examples/update-nfts-metadata-of-non-fungible-token.js
@@ -32,14 +32,14 @@ async function main() {
     }
 
     const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
-    const operatorKey = PrivateKey.fromStringDer(process.env.OPERATOR_KEY);
+    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
     const network = process.env.HEDERA_NETWORK;
     const client = Client.forName(network).setOperator(operatorId, operatorKey);
 
     // Generate a metadata key
-    const metadataKey = PrivateKey.generateED25519();
+    const metadataKey = PrivateKey.generateECDSA();
     // Generate a supply key
-    const supplyKey = PrivateKey.generateED25519();
+    const supplyKey = PrivateKey.generateECDSA();
     // Initial metadata
     const metadata = new Uint8Array([1]);
     // New metadata
diff --git a/examples/zeroTokenOperations.js b/examples/zeroTokenOperations.js
index 4417ed2deb..ed59f61d5c 100644
--- a/examples/zeroTokenOperations.js
+++ b/examples/zeroTokenOperations.js
@@ -11,7 +11,7 @@ dotenv.config();
 //Step 6 is executed through the SDK
 
 async function main() {
-    // Keys should be ED25519
+    // Keys should be ECDSA
     // TODO: Fix the wallet to work with ECDSA
     if (
         process.env.OPERATOR_ID == null ||
@@ -33,7 +33,7 @@ async function main() {
         provider,
     );
 
-    const operatorPrivateKey = hashgraph.PrivateKey.fromStringDer(
+    const operatorPrivateKey = hashgraph.PrivateKey.fromStringECDSA(
         process.env.OPERATOR_KEY,
     );
     const operatorPublicKey = operatorPrivateKey.publicKey;
@@ -42,7 +42,7 @@ async function main() {
         process.env.OPERATOR_ID,
     );
 
-    const alicePrivateKey = hashgraph.PrivateKey.generateED25519();
+    const alicePrivateKey = hashgraph.PrivateKey.generateECDSA();
     const alicePublicKey = alicePrivateKey.publicKey;
 
     try {