diff --git a/package-lock.json b/package-lock.json
index a652c94..b410db6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "conseiljs-softsigner",
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@@ -279,15 +279,15 @@
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@@ -406,6 +416,15 @@
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-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.0.3.tgz",
-          "integrity": "sha512-CNmdbwQMBjwr9Gsmohvm0pbL954tJrNzf6gWL3K+QMQf00PF7ERGrEiLgjuU3mKreLC2MeGhUsNV9ybTbLgd3w==",
-          "dev": true
-        },
         "which": {
           "version": "1.3.1",
           "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -8127,22 +7994,21 @@
           }
         },
         "yargs": {
-          "version": "13.2.4",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
-          "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
+          "version": "13.3.2",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+          "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
           "dev": true,
           "requires": {
             "cliui": "^5.0.0",
             "find-up": "^3.0.0",
             "get-caller-file": "^2.0.1",
-            "os-locale": "^3.1.0",
             "require-directory": "^2.1.1",
             "require-main-filename": "^2.0.0",
             "set-blocking": "^2.0.0",
             "string-width": "^3.0.0",
             "which-module": "^2.0.0",
             "y18n": "^4.0.0",
-            "yargs-parser": "^13.1.0"
+            "yargs-parser": "^13.1.2"
           }
         },
         "yargs-parser": {
@@ -8170,9 +8036,9 @@
       }
     },
     "webpack-node-externals": {
-      "version": "1.7.2",
-      "resolved": "https://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-1.7.2.tgz",
-      "integrity": "sha512-ajerHZ+BJKeCLviLUUmnyd5B4RavLF76uv3cs6KNuO8W+HuQaEs0y0L7o40NQxdPy5w0pcv8Ew7yPUAQG0UdCg==",
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-2.5.0.tgz",
+      "integrity": "sha512-g7/Z7Q/gsP8GkJkKZuJggn6RSb5PvxW1YD5vvmRZIxaSxAzkqjfL5n9CslVmNYlSqBVCyiqFgOqVS2IOObCSRg==",
       "dev": true
     },
     "webpack-sources": {
@@ -8271,6 +8137,12 @@
         "errno": "~0.1.7"
       }
     },
+    "workerpool": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.0.0.tgz",
+      "integrity": "sha512-fU2OcNA/GVAJLLyKUoHkAgIhKb0JoCpSjLC/G2vYKxUjVmQwGbRVeoPJ1a8U4pnVofz4AQV5Y/NEw8oKqxEBtA==",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
diff --git a/package.json b/package.json
index bda7e56..14e02b5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "conseiljs-softsigner",
-  "version": "5.0.3-beta.0",
+  "version": "5.0.4",
   "description": "ConseilJS software signer plugin for ConseilJS-core. Supports the ED25519 curve via libsodium for tz1-address operations.",
   "browser": "dist/index.js",
   "main": "dist/index.js",
@@ -64,18 +64,19 @@
   },
   "dependencies": {
     "bip39": "3.0.2",
-    "conseiljs": "5.0.3-beta.2",
+    "conseiljs": "5.0.4-beta.0",
     "generate-password": "1.5.1",
-    "libsodium-wrappers-sumo": "0.7.6"
+    "libsodium-wrappers-sumo": "0.7.6",
+    "secp256k1": "4.0.2"
   },
   "devDependencies": {
-    "@types/chai": "4.2.11",
-    "@types/chai-as-promised": "7.1.2",
-    "@types/mocha": "7.0.2",
+    "@types/chai": "4.2.12",
+    "@types/chai-as-promised": "7.1.3",
+    "@types/mocha": "8.0.0",
     "@types/nock": "11.1.0",
     "@types/node": "14.0.13",
-    "@typescript-eslint/eslint-plugin": "3.2.0",
-    "@typescript-eslint/parser": "3.2.0",
+    "@typescript-eslint/eslint-plugin": "3.7.1",
+    "@typescript-eslint/parser": "3.7.1",
     "awesome-typescript-loader": "5.2.1",
     "chai": "4.2.0",
     "chai-as-promised": "7.1.1",
@@ -84,19 +85,19 @@
     "eslint": "7.2.0",
     "eslint-config-airbnb-base": "14.2.0",
     "eslint-plugin-import": "2.21.2",
-    "mocha": "7.2.0",
+    "mocha": "8.0.1",
     "nyc": "15.1.0",
     "request-promise": "4.2.5",
     "terser-webpack-plugin": "3.0.3",
-    "ts-loader": "7.0.5",
+    "ts-loader": "8.0.1",
     "ts-node": "8.10.2",
-    "tsconfig-paths-webpack-plugin": "3.2.0",
-    "typedoc": "0.17.7",
+    "tsconfig-paths-webpack-plugin": "3.3.0",
+    "typedoc": "0.17.8",
     "typedoc-plugin-markdown": "2.3.1",
     "typescript": "3.8.3",
-    "webpack": "4.43.0",
-    "webpack-cli": "3.3.11",
-    "webpack-node-externals": "1.7.2"
+    "webpack": "4.44.0",
+    "webpack-cli": "3.3.12",
+    "webpack-node-externals": "2.5.0"
   },
   "engines": {
     "node": ">=12.16.3",
diff --git a/src/KeyStoreUtils.ts b/src/KeyStoreUtils.ts
index b0d0401..6978906 100644
--- a/src/KeyStoreUtils.ts
+++ b/src/KeyStoreUtils.ts
@@ -1,6 +1,7 @@
 import * as bip39 from 'bip39';
+import * as secp256k1 from 'secp256k1';
 
-import { KeyStore, KeyStoreCurve, KeyStoreType } from 'conseiljs';
+import { KeyStore, KeyStoreCurve, KeyStoreType, SignerCurve } from 'conseiljs';
 import { TezosMessageUtils } from 'conseiljs';
 
 import { CryptoUtils } from './utils/CryptoUtils'
@@ -134,9 +135,35 @@ export namespace KeyStoreUtils {
             messageBytes = Buffer.from(message, 'utf8');
         }
 
-        const sig = TezosMessageUtils.writeSignatureWithHint(signature, 'edsig');
-        const pk = TezosMessageUtils.writeKeyWithHint(publicKey, 'edpk');
+        return checkSignature(signature, messageBytes, publicKey);
+    }
+
+    export async function checkSignature(signature: string, bytes: Buffer, publicKey: string): Promise<boolean> {
+        const sigPrefix = signature.slice(0, 5);
+        const keyPrefix = publicKey.slice(0, 4);
+        let curve = SignerCurve.ED25519;
+
+        if (sigPrefix === 'edsig' && keyPrefix === 'edpk') {
+            curve = SignerCurve.ED25519;
+        } else if (sigPrefix === 'spsig' && keyPrefix === 'sppk') {
+            curve = SignerCurve.SECP256K1;
+        } else if (sigPrefix === 'p2sig' && keyPrefix === 'p2pk') {
+            throw new Error('secp256r1 curve is not currently supported');
+        } else {
+            throw new Error(`Signature/key prefix mismatch ${sigPrefix}/${keyPrefix}`);
+        }
+
+        const sig = TezosMessageUtils.writeSignatureWithHint(signature, sigPrefix);
+        const pk = TezosMessageUtils.writeKeyWithHint(publicKey, keyPrefix);
+
+        if (curve === SignerCurve.ED25519) {
+            return await CryptoUtils.checkSignature(sig, bytes, pk);
+        }
+
+        if (curve === SignerCurve.SECP256K1) {
+            return secp256k1.ecdsaVerify(sig, bytes, pk);
+        }
 
-        return await CryptoUtils.checkSignature(sig, messageBytes, pk);
+        return false;
     }
 }
diff --git a/test/KeyStoreUtils.spec.ts b/test/KeyStoreUtils.spec.ts
index 5573e71..7cf9238 100644
--- a/test/KeyStoreUtils.spec.ts
+++ b/test/KeyStoreUtils.spec.ts
@@ -1,6 +1,6 @@
 import { expect, use } from "chai";
 import chaiAsPromised from 'chai-as-promised';
-import { TezosMessageUtils } from 'conseiljs';
+import { SignerCurve, TezosMessageUtils } from 'conseiljs';
 
 import { KeyStoreUtils } from '../src/KeyStoreUtils';
 
@@ -99,7 +99,7 @@ describe('KeyStoreUtils tests', () => {
         expect(result.toString('utf8')).to.equal('Tezos Tacos Nachos Burritos');
     });
 
-    it('checkTextSignature', async () => {
+    it('checkTextSignature ED25519', async () => {
         const message = 'Tacos Burritos';
         const keyStore = await KeyStoreUtils.restoreIdentityFromSecretKey('edskRgu8wHxjwayvnmpLDDijzD3VZDoAH7ZLqJWuG4zg7LbxmSWZWhtkSyM5Uby41rGfsBGk4iPKWHSDniFyCRv3j7YFCknyHH');
         const sig = 'edsigtbmrgC8V2xU3Dc3n99v8CZk3cQAX1PcwbGRDkVkFSqax996qTPXsLryas9WBN9mCXiJFQSUiVkkkot6jQ4eEsU8rAt6jzW';
@@ -109,7 +109,7 @@ describe('KeyStoreUtils tests', () => {
         expect(result).to.equal(true);
     });
 
-    it('checkTextSignature, hashed', async () => {
+    it('checkTextSignature ED25519, hashed', async () => {
         let publicKey = (await KeyStoreUtils.restoreIdentityFromSecretKey('edskRgu8wHxjwayvnmpLDDijzD3VZDoAH7ZLqJWuG4zg7LbxmSWZWhtkSyM5Uby41rGfsBGk4iPKWHSDniFyCRv3j7YFCknyHH')).publicKey;
         let message = 'Tacos Burritos';
         let sig = 'edsigtmoSkpMujSVYXH6zxSaZyiH27qYscBezFWNnDohoBoKdmY9c4Jk8EhdNGok9riQGLu1MTnXM9y5om2cRAUCdFtXKQKp57f';
@@ -122,4 +122,14 @@ describe('KeyStoreUtils tests', () => {
         result = await KeyStoreUtils.checkTextSignature(sig, message, publicKey, true);
         expect(result).to.equal(true);
     });
+
+    it('checkTextSignature SECP256K1', async () => {
+        const message = 'Tacos Burritos';
+        const publicKey = TezosMessageUtils.readKeyWithHint(Buffer.from('0366c4ad39716c06e1cb9348905d3743f236a8b97c5835ced80930dadf51bfbfdd', 'hex'), 'sppk');
+        const sig = TezosMessageUtils.readSignatureWithHint(Buffer.from('e9a933ffaaf885bd345ddba87c6518e2a87e6827ab53cc112fbe415b83fc74cf437bc970ecdf2b886dc0005b6358ae04cc03de25cf841bc5fd1f1a525d9920ad', 'hex'), SignerCurve.SECP256K1);
+
+        const result = await KeyStoreUtils.checkTextSignature(sig, message, publicKey, true);
+
+        expect(result).to.equal(true);
+    });
 });