diff --git a/.env.example b/.env.example
index d27f846..9354a4b 100644
--- a/.env.example
+++ b/.env.example
@@ -1 +1,2 @@
 PRIVATE_KEY=75f719e613d05efab06a3f1dde5250b497723b13d4afa4f8ed80145764e40cf7
+COSMOS_CHAIN_ID=laconic_9000-1
diff --git a/package.json b/package.json
index a9fcf73..4a3e3d1 100644
--- a/package.json
+++ b/package.json
@@ -11,10 +11,11 @@
     "@types/jest": "^27.4.1",
     "@types/lodash": "^4.14.181",
     "@types/semver": "^7.3.9",
+    "@types/tiny-secp256k1": "1.0.0",
     "dotenv": "^16.0.0",
-    "protoc-gen-ts": "^0.8.5",
     "google-protobuf": "^3.21.0",
     "jest": "29.0.0",
+    "protoc-gen-ts": "^0.8.5",
     "ts-jest": "^29.0.2",
     "typescript": "^4.6.2"
   },
@@ -39,7 +40,7 @@
     "lodash": "^4.17.21",
     "node-yaml": "^4.0.1",
     "semver": "^7.3.5",
-    "tiny-secp256k1": "^2.2.1"
+    "tiny-secp256k1": "^1.1.6"
   },
   "scripts": {
     "test": "jest --runInBand --verbose",
diff --git a/src/auction.test.ts b/src/auction.test.ts
index 111484c..06637c3 100644
--- a/src/auction.test.ts
+++ b/src/auction.test.ts
@@ -16,7 +16,7 @@ const auctionTests = (numBidders = 3) => {
   beforeAll(async () => {
     console.log('Running auction tests with num bidders', numBidders);
 
-    registry = new Registry(restEndpoint, gqlEndpoint, chainId);
+    registry = new Registry(gqlEndpoint, restEndpoint, chainId);
   });
 
   test('Setup bidder accounts', async () => {
diff --git a/src/bond.test.ts b/src/bond.test.ts
index 77369c4..2b7f93c 100644
--- a/src/bond.test.ts
+++ b/src/bond.test.ts
@@ -29,7 +29,7 @@ const bondTests = () => {
   };
 
   beforeAll(async () => {
-    registry = new Registry(restEndpoint, gqlEndpoint, chainId);
+    registry = new Registry(gqlEndpoint, restEndpoint, chainId);
   });
 
   test('Create bond.', async () => {
diff --git a/src/index.test.ts b/src/index.test.ts
index b1ee44a..fc96f80 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -10,7 +10,7 @@ const registryTests = () => {
   let registry: Registry;
 
   beforeAll(async () => {
-    registry = new Registry(restEndpoint, gqlEndpoint, chainId);
+    registry = new Registry(gqlEndpoint, restEndpoint, chainId);
 
   });
 
diff --git a/src/index.ts b/src/index.ts
index ae06546..c83797d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -53,6 +53,8 @@ import {
   MessageMsgRevealBid
 } from './messages/auction';
 
+export const DEFAULT_CHAIN_ID = 'laconic_9000-1';
+
 const DEFAULT_WRITE_ERROR = 'Unable to write to laconicd.';
 
 // Parse Tx response from cosmos-sdk.
@@ -119,21 +121,21 @@ export class Registry {
     return errorMessage || DEFAULT_WRITE_ERROR;
   }
 
-  constructor(restUrl: string, gqlUrl: string, chainId: string) {
-    if (!isUrl(restUrl)) {
-      throw new Error('Path to a REST endpoint should be provided.');
-    }
-
+  constructor(gqlUrl: string, restUrl: string = "", chainId: string = DEFAULT_CHAIN_ID) {
     if (!isUrl(gqlUrl)) {
       throw new Error('Path to a GQL endpoint should be provided.');
     }
 
+    if (restUrl && !isUrl(restUrl)) {
+      throw new Error('REST endpoint is not a URL string.');
+    }
+
     this._endpoints = {
       rest: restUrl,
       gql: gqlUrl
     };
 
-    this._client = new RegistryClient(restUrl, gqlUrl);
+    this._client = new RegistryClient(gqlUrl, restUrl);
     this._chainID = chainId;
 
     this._chain = {
diff --git a/src/nameservice-expiry.test.ts b/src/nameservice-expiry.test.ts
index afa49ed..a52ab3b 100644
--- a/src/nameservice-expiry.test.ts
+++ b/src/nameservice-expiry.test.ts
@@ -20,7 +20,7 @@ const nameserviceExpiryTests = () => {
   let recordExpiryTime: Date;
 
   beforeAll(async () => {
-    registry = new Registry(restEndpoint, gqlEndpoint, chainId);
+    registry = new Registry(gqlEndpoint, restEndpoint, chainId);
 
     // Create bond.
     bondId = await registry.getNextBondId(privateKey);
diff --git a/src/naming.test.ts b/src/naming.test.ts
index 943d122..7445e41 100644
--- a/src/naming.test.ts
+++ b/src/naming.test.ts
@@ -25,7 +25,7 @@ const namingTests = () => {
   let crn: string;
 
   beforeAll(async () => {
-    registry = new Registry(restEndpoint, gqlEndpoint, chainId);
+    registry = new Registry(gqlEndpoint, restEndpoint, chainId);
 
     // Create bond.
     bondId = await registry.getNextBondId(privateKey);
diff --git a/src/registry-client.ts b/src/registry-client.ts
index 79cc5f7..ec49994 100644
--- a/src/registry-client.ts
+++ b/src/registry-client.ts
@@ -122,15 +122,14 @@ export class RegistryClient {
   /**
    * New Client.
    */
-  constructor(restEndpoint: string, gqlEndpoint: string) {
-    assert(restEndpoint);
-
-    this._restEndpoint = restEndpoint;
-
+  constructor(gqlEndpoint: string, restEndpoint: string) {
+    assert(gqlEndpoint);
     this._graph = graphqlClient(gqlEndpoint, {
       method: 'POST',
       asJSON: true
     });
+
+    this._restEndpoint = restEndpoint;
   }
 
   /**
diff --git a/src/sdk.test.ts b/src/sdk.test.ts
index 0380d86..80038cf 100644
--- a/src/sdk.test.ts
+++ b/src/sdk.test.ts
@@ -15,7 +15,7 @@ describe('Querying', () => {
   let bondId: string;
 
   beforeAll(async () => {
-    registry = new Registry(restEndpoint, gqlEndpoint, chainId);
+    registry = new Registry(gqlEndpoint, restEndpoint, chainId);
     bondId = await provisionBondId(registry, privateKey, fee);
 
     const publishNewWatcherVersion = async () => {
diff --git a/src/testing/helper.ts b/src/testing/helper.ts
index be127b1..86cde9f 100644
--- a/src/testing/helper.ts
+++ b/src/testing/helper.ts
@@ -3,7 +3,7 @@ import yaml from 'node-yaml';
 import semver from 'semver';
 import { Fee } from '@tharsis/transactions';
 
-import { Registry } from '../index';
+import { DEFAULT_CHAIN_ID, Registry } from '../index';
 
 export const ensureUpdatedConfig = async (path: string) => {
   const conf = await yaml.read(path);
@@ -37,7 +37,7 @@ export const getConfig = () => {
   assert(process.env.PRIVATE_KEY);
 
   return {
-    chainId: process.env.COSMOS_CHAIN_ID || 'laconic_9000-1',
+    chainId: process.env.COSMOS_CHAIN_ID || DEFAULT_CHAIN_ID,
     privateKey: process.env.PRIVATE_KEY,
     restEndpoint: process.env.LACONICD_REST_ENDPOINT || 'http://localhost:1317',
     gqlEndpoint: process.env.LACONICD_GQL_ENDPOINT || 'http://localhost:9473/api',
diff --git a/src/util.test.ts b/src/util.test.ts
index c0103c6..df58da1 100644
--- a/src/util.test.ts
+++ b/src/util.test.ts
@@ -18,7 +18,7 @@ const utilTests = () => {
   let watcherId: string;
 
   beforeAll(async () => {
-    registry = new Registry(restEndpoint, gqlEndpoint, chainId);
+    registry = new Registry(gqlEndpoint, restEndpoint, chainId);
 
     // Create bond.
     bondId = await registry.getNextBondId(privateKey);
diff --git a/yarn.lock b/yarn.lock
index 0d62909..38fbfb0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1169,6 +1169,13 @@
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-2.0.1.tgz#20f18294f797f2209b5f65c8e3b5c8e8261d127c"
   integrity sha512-Hl219/BT5fLAaz6NDkSuhzasy49dwQS/DSdu4MdggFB8zcXv7vflBI3xp7FEmkmdDkBUI2bPUNeMttp2knYdxw==
 
+"@types/tiny-secp256k1@1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@types/tiny-secp256k1/-/tiny-secp256k1-1.0.0.tgz#0c8fde0dfd320c9d089907e37805d67a346ad991"
+  integrity sha512-IW3dFGNyVkVLC1MCMogVWQaKH/ZtjPQdOW9c3X128o5lVpFYNsq/l3Qo1pV7sfTmvDzWEXR3QTxg1TMy1pyaAQ==
+  dependencies:
+    "@types/node" "*"
+
 "@types/yargs-parser@*":
   version "21.0.0"
   resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-21.0.0.tgz#0c60e537fa790f5f9472ed2776c2b71ec117351b"
@@ -1331,6 +1338,13 @@ big-integer@1.6.36:
   resolved "https://registry.yarnpkg.com/big-integer/-/big-integer-1.6.36.tgz#78631076265d4ae3555c04f85e7d9d2f3a071a36"
   integrity sha512-t70bfa7HYEA1D9idDbmuv7YbsbVkQ+Hp+8KFSul4aE5e/i1bjCNIRYJZlA8Q8p0r9T8cF/RVvwUgRA//FydEyg==
 
+bindings@^1.3.0:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.5.0.tgz#10353c9e945334bc0511a6d90b38fbc7c9c504df"
+  integrity sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==
+  dependencies:
+    file-uri-to-path "1.0.0"
+
 bip32@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/bip32/-/bip32-3.0.1.tgz#1d1121469cce6e910e0ec3a5a1990dd62687e2a3"
@@ -1670,7 +1684,7 @@ electron-to-chromium@^1.4.251:
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.4.266.tgz#b2ce973eedbff309e2b98d1ed348e447bd4681fe"
   integrity sha512-saJTYECxUSv7eSpnXw0XIEvUkP9x4s/x2mm3TVX7k4rIFS6f5TjBih1B5h437WzIhHQjid+d8ouQzPQskMervQ==
 
-elliptic@6.5.4, elliptic@^6.5.2, elliptic@^6.5.3, elliptic@^6.5.4:
+elliptic@6.5.4, elliptic@^6.4.0, elliptic@^6.5.2, elliptic@^6.5.3, elliptic@^6.5.4:
   version "6.5.4"
   resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.4.tgz#da37cebd31e79a1367e941b592ed1fbebd58abbb"
   integrity sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==
@@ -1871,6 +1885,11 @@ fb-watchman@^2.0.0:
   dependencies:
     bser "2.1.1"
 
+file-uri-to-path@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz#553a7b8446ff6f684359c445f1e37a05dacc33dd"
+  integrity sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==
+
 fill-range@^7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-7.0.1.tgz#1919a6a7c75fe38b2c7c77e5198535da9acdda40"
@@ -2738,6 +2757,11 @@ multiformats@^9.5.4:
   resolved "https://registry.yarnpkg.com/multiformats/-/multiformats-9.6.4.tgz#5dce1f11a407dbb69aa612cb7e5076069bb759ca"
   integrity sha512-fCCB6XMrr6CqJiHNjfFNGT0v//dxOBMrOMqUIzpPc/mmITweLEyhvMpY9bF+jZ9z3vaMAau5E8B68DW77QMXkg==
 
+nan@^2.13.2:
+  version "2.17.0"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.17.0.tgz#c0150a2368a182f033e9aa5195ec76ea41a199cb"
+  integrity sha512-2ZTgtl0nJsO0KQCjEpxcIr5D+Yv90plTitZt9JBfQvVJDS5seMl3FOvsh3+9CoYWXf/1l5OaZzzF6nDm4cagaQ==
+
 natural-compare@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
@@ -3252,12 +3276,16 @@ test-exclude@^6.0.0:
     glob "^7.1.4"
     minimatch "^3.0.4"
 
-tiny-secp256k1@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/tiny-secp256k1/-/tiny-secp256k1-2.2.1.tgz#a61d4791b7031aa08a9453178a131349c3e10f9b"
-  integrity sha512-/U4xfVqnVxJXN4YVsru0E6t5wVncu2uunB8+RVR40fYUxkKYUPS10f+ePQZgFBoE/Jbf9H1NBveupF2VmB58Ng==
+tiny-secp256k1@^1.1.6:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/tiny-secp256k1/-/tiny-secp256k1-1.1.6.tgz#7e224d2bee8ab8283f284e40e6b4acb74ffe047c"
+  integrity sha512-FmqJZGduTyvsr2cF3375fqGHUovSwDi/QytexX1Se4BPuPZpTE5Ftp5fg+EFSuEf3lhZqgCRjEG3ydUQ/aNiwA==
   dependencies:
-    uint8array-tools "0.0.7"
+    bindings "^1.3.0"
+    bn.js "^4.11.8"
+    create-hmac "^1.1.7"
+    elliptic "^6.4.0"
+    nan "^2.13.2"
 
 tmpl@1.0.5:
   version "1.0.5"
@@ -3320,11 +3348,6 @@ typescript@^4.6.2:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.6.2.tgz#fe12d2727b708f4eef40f51598b3398baa9611d4"
   integrity sha512-HM/hFigTBHZhLXshn9sN37H085+hQGeJHJ/X7LpBWLID/fbc2acUMfU+lGD98X81sKP+pFa9f0DZmCwB9GnbAg==
 
-uint8array-tools@0.0.7:
-  version "0.0.7"
-  resolved "https://registry.yarnpkg.com/uint8array-tools/-/uint8array-tools-0.0.7.tgz#a7a2bb5d8836eae2fade68c771454e6a438b390d"
-  integrity sha512-vrrNZJiusLWoFWBqz5Y5KMCgP9W9hnjZHzZiZRT8oNAkq3d5Z5Oe76jAvVVSRh4U8GGR90N2X1dWtrhvx6L8UQ==
-
 update-browserslist-db@^1.0.9:
   version "1.0.9"
   resolved "https://registry.yarnpkg.com/update-browserslist-db/-/update-browserslist-db-1.0.9.tgz#2924d3927367a38d5c555413a7ce138fc95fcb18"