diff --git a/README.md b/README.md
index d872883..5144129 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ Follow these steps to run the tests:
 - Checkout to appropriate branch for running tests.
 
   ```bash
-  git checkout ng-chiba-clonk-client
+  git checkout ng-v12-chiba-clonk-client
   ```
 
 - Run the chain using `./init.sh`.
diff --git a/package.json b/package.json
index fb26993..b39f33b 100644
--- a/package.json
+++ b/package.json
@@ -24,13 +24,17 @@
     "@cosmjs/stargate": "^0.28.0",
     "@metamask/eth-sig-util": "^4.0.0",
     "axios": "^0.26.1",
+    "bech32": "^2.0.0",
+    "bip32": "^3.0.1",
+    "bip39": "^3.0.4",
     "ethers": "^5.6.1",
     "evmosjs": "^0.2.2",
     "graphql.js": "^0.6.8",
     "is-url": "^1.2.4",
     "js-sha256": "^0.9.0",
     "ripemd160": "^2.0.2",
-    "secp256k1": "^4.0.3"
+    "secp256k1": "^4.0.3",
+    "tiny-secp256k1": "^2.2.1"
   },
   "scripts": {
     "test": "jest --runInBand",
diff --git a/src/account.ts b/src/account.ts
index 76cd363..0bec06e 100644
--- a/src/account.ts
+++ b/src/account.ts
@@ -1,6 +1,15 @@
 import assert from 'assert';
+import BIP32Factory from 'bip32';
+import * as ecc from 'tiny-secp256k1';
+import * as bip39 from 'bip39';
 import { MessageTypes, signTypedData, SignTypedDataVersion } from '@metamask/eth-sig-util';
-import { Secp256k1 } from "@cosmjs/crypto";
+import { Ripemd160, Secp256k1 } from "@cosmjs/crypto";
+import { toBech32, toHex } from '@cosmjs/encoding';
+import { rawSecp256k1PubkeyToRawAddress } from "@cosmjs/amino";
+
+const HDPATH = "m/44'/60'/0'/0";
+
+const bip32 = BIP32Factory(ecc);
 
 interface TypedMessageDomain {
   name?: string;
@@ -17,6 +26,30 @@ interface TypedMessageDomain {
 export class Account {
   _privateKey: Buffer
   _publicKey?: Uint8Array
+  _cosmosAddress?: string
+  _formattedCosmosAddress?: string
+
+    /**
+   * Generate bip39 mnemonic.
+   */
+  static generateMnemonic() {
+    return bip39.generateMnemonic();
+  }
+
+  /**
+   * Generate private key from mnemonic.
+   */
+  static async generateFromMnemonic(mnemonic: string) {
+    assert(mnemonic);
+
+    const seed = await bip39.mnemonicToSeed(mnemonic);
+    const wallet = bip32.fromSeed(seed);
+    const account = wallet.derivePath(HDPATH);
+    const { privateKey } = account;
+    assert(privateKey);
+
+    return new Account(privateKey);
+  }
 
   /**
    * New Account.
@@ -32,12 +65,23 @@ export class Account {
     return this._privateKey;
   }
 
+  get formattedCosmosAddress() {
+    return this._formattedCosmosAddress;
+  }
+
   async init () {
     // Generate public key.
     const keypair = await Secp256k1.makeKeypair(this._privateKey);
 
     const compressed = Secp256k1.compressPubkey(keypair.pubkey);
     this._publicKey = compressed
+
+    // 2. Generate cosmos-sdk address.
+    // let publicKeySha256 = sha256(this._publicKey);
+    this._cosmosAddress = new Ripemd160().update(keypair.pubkey).digest().toString();
+
+    // 3. Generate cosmos-sdk formatted address.
+    this._formattedCosmosAddress = toBech32('ethm', rawSecp256k1PubkeyToRawAddress(this._publicKey));
   }
 
   /**
diff --git a/src/index.ts b/src/index.ts
index 9cf73ed..35b7f7a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,6 +6,8 @@ import {
   Chain,
   Sender,
   Fee,
+  createMessageSend,
+  MessageSendParams
 } from '@tharsis/transactions'
 
 import { createTxMsgCancelBond, createTxMsgCreateBond, createTxMsgRefillBond, createTxMsgWithdrawBond, MessageMsgCancelBond, MessageMsgCreateBond, MessageMsgRefillBond, MessageMsgWithdrawBond } from "./bond";
@@ -78,6 +80,36 @@ export class Registry {
     return this._client.getAccount(address);
   }
 
+  /**
+   * Send coins.
+   * @param {object[]} amount
+   * @param {string} toAddress
+   * @param {string} privateKey
+   * @param {object} fee
+   */
+   async sendCoins(params: MessageSendParams, senderAddress: string, privateKey: string, fee: Fee) {
+    let result;
+
+    try {
+      const { account: { base_account: accountInfo } } = await this.getAccount(senderAddress);
+
+      const sender = {
+        accountAddress: accountInfo.address,
+        sequence: accountInfo.sequence,
+        accountNumber: accountInfo.account_number,
+        pubkey: accountInfo.pub_key.key,
+      }
+
+      const msg = createMessageSend(this._chain, sender, fee, '', params)
+      result = await this._submitTx(msg, privateKey, sender);
+    } catch (err: any) {
+      const error = err[0] || err;
+      throw new Error(Registry.processWriteError(error));
+    }
+
+    return parseTxResponse(result);
+  }
+
   /**
    * Computes the next bondId for the given account private key.
    */
diff --git a/src/naming.test.ts b/src/naming.test.ts
index 471bbd0..11dead8 100644
--- a/src/naming.test.ts
+++ b/src/naming.test.ts
@@ -1,3 +1,6 @@
+import assert from 'assert';
+
+import { Account } from './account';
 import { Registry } from './index';
 import { getConfig, wait } from './testing/helper';
 
@@ -43,6 +46,50 @@ const namingTests = () => {
     expect(record.ownerPublicKey).toBe('');
     expect(Number(record.height)).toBe(0);
   });
+
+  xtest('Reserve already reserved authority', async () => {
+    await expect(registry.reserveAuthority({ name: authorityName, owner: accountAddress }, accountAddress, privateKey, fee)).rejects.toThrow('Name already reserved.');
+  });
+
+  test('Reserve sub-authority.', async () => {
+    const subAuthority = `echo.${authorityName}`;
+    await registry.reserveAuthority({ name: subAuthority, owner: accountAddress }, accountAddress, privateKey, fee);
+    await wait(5000)
+
+    const [record] = await registry.lookupAuthorities([subAuthority]);
+    expect(record).toBeDefined();
+    expect(record.ownerAddress).not.toBe('');
+    expect(record.ownerPublicKey).not.toBe('');
+    expect(Number(record.height)).toBeGreaterThan(0);
+  });
+
+  test('Reserve sub-authority with different owner.', async () => {
+    // Create another account, send tx to set public key on the account.
+    const mnenonic1 = Account.generateMnemonic();
+    const otherAccount1 = await Account.generateFromMnemonic(mnenonic1);
+    await otherAccount1.init()
+    assert(otherAccount1.formattedCosmosAddress)
+    await registry.sendCoins({ denom: 'aphoton', amount: '1000000000', destinationAddress: otherAccount1.formattedCosmosAddress }, accountAddress, privateKey, fee);
+
+    const mnenonic2 = Account.generateMnemonic();
+    const otherAccount2 = await Account.generateFromMnemonic(mnenonic2);
+    await otherAccount2.init()
+    assert(otherAccount2.formattedCosmosAddress)
+    await registry.sendCoins({ denom: 'aphoton', amount: '10', destinationAddress: otherAccount2.formattedCosmosAddress }, accountAddress, privateKey, fee);
+
+    await wait(5000)
+
+    const subAuthority = `halo.${authorityName}`;
+    await registry.reserveAuthority({ name: subAuthority, owner: otherAccount1.formattedCosmosAddress }, accountAddress, privateKey, fee);
+    await wait(5000)
+
+    const [record] = await registry.lookupAuthorities([subAuthority]);
+    expect(record).toBeDefined();
+    expect(record.ownerAddress).toBeDefined();
+    expect(record.ownerAddress).toBe(otherAccount1.formattedCosmosAddress);
+    expect(record.ownerPublicKey).toBeDefined();
+    expect(Number(record.height)).toBeGreaterThan(0);
+  });
 };
 
 if (mockServer || process.env.WIRE_AUCTIONS_ENABLED) {
diff --git a/yarn.lock b/yarn.lock
index 8145a01..e99605b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1256,6 +1256,16 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-17.0.23.tgz#3b41a6e643589ac6442bdbd7a4a3ded62f33f7da"
   integrity sha512-UxDxWn7dl97rKVeVS61vErvw086aCYhDLyvRQZ5Rk65rZKepaFdm53GeqXaKBuOhED4e9uWq34IC3TdSdJJ2Gw==
 
+"@types/node@10.12.18":
+  version "10.12.18"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-10.12.18.tgz#1d3ca764718915584fcd9f6344621b7672665c67"
+  integrity sha512-fh+pAqt4xRzPfqA6eh3Z2y6fyZavRIumvjhaCL753+TVkGKGhpPeyrJG2JftD0T9q4GF00KjefsQ+PQNDdWQaQ==
+
+"@types/node@11.11.6":
+  version "11.11.6"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-11.11.6.tgz#df929d1bb2eee5afdda598a41930fe50b43eaa6a"
+  integrity sha512-Exw4yUWMBXM3X+8oqzJNRqZSwUAaS4+7NdvHqQuFi/d+synz++xmX3QIf+BFqneW8N31R8Ky+sikfZUXq07ggQ==
+
 "@types/node@^13.7.0":
   version "13.13.52"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-13.13.52.tgz#03c13be70b9031baaed79481c0c0cfb0045e53f7"
@@ -1512,6 +1522,28 @@ 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==
 
+bip32@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/bip32/-/bip32-3.0.1.tgz#1d1121469cce6e910e0ec3a5a1990dd62687e2a3"
+  integrity sha512-Uhpp9aEx3iyiO7CpbNGFxv9WcMIVdGoHG04doQ5Ln0u60uwDah7jUSc3QMV/fSZGm/Oo01/OeAmYevXV+Gz5jQ==
+  dependencies:
+    "@types/node" "10.12.18"
+    bs58check "^2.1.1"
+    create-hash "^1.2.0"
+    create-hmac "^1.1.7"
+    typeforce "^1.11.5"
+    wif "^2.0.6"
+
+bip39@^3.0.4:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/bip39/-/bip39-3.0.4.tgz#5b11fed966840b5e1b8539f0f54ab6392969b2a0"
+  integrity sha512-YZKQlb752TrUWqHWj7XAwCSjYEgGAk+/Aas3V7NyjQeZYsztO8JnQUaCWhcnL4T+jL8nvB8typ2jRPzTlgugNw==
+  dependencies:
+    "@types/node" "11.11.6"
+    create-hash "^1.1.0"
+    pbkdf2 "^3.0.9"
+    randombytes "^2.0.1"
+
 blakejs@^1.1.0:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/blakejs/-/blakejs-1.2.1.tgz#5057e4206eadb4a97f7c0b6e197a505042fc3814"
@@ -1589,7 +1621,7 @@ bs58@^4.0.0, bs58@^4.0.1:
   dependencies:
     base-x "^3.0.2"
 
-bs58check@^2.1.2:
+bs58check@<3.0.0, bs58check@^2.1.1, bs58check@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/bs58check/-/bs58check-2.1.2.tgz#53b018291228d82a5aa08e7d796fdafda54aebfc"
   integrity sha512-0TS1jicxdU09dwJMNZtVAfzPi6Q6QeN0pM1Fkzrjn+XYHvzMKPU3pHVpva+769iNVSfIYWf7LJ6WR+BuuMf8cA==
@@ -3217,7 +3249,7 @@ path-parse@^1.0.7:
   resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.7.tgz#fbc114b60ca42b30d9daf5858e4bd68bbedb6735"
   integrity sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==
 
-pbkdf2@^3.0.17:
+pbkdf2@^3.0.17, pbkdf2@^3.0.9:
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.1.2.tgz#dd822aa0887580e52f1a039dc3eda108efae3075"
   integrity sha512-iuh7L6jA7JEGu2WxDwtQP1ddOpaJNC4KlDEFfdQajSGgGPNi4OyDc2R7QnbY2bR9QjBVGwgvTdNJZoE7RaxUMA==
@@ -3325,7 +3357,7 @@ punycode@^2.1.1:
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
   integrity sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==
 
-randombytes@^2.1.0:
+randombytes@^2.0.1, randombytes@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"
   integrity sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==
@@ -3682,6 +3714,13 @@ throat@^6.0.1:
   resolved "https://registry.yarnpkg.com/throat/-/throat-6.0.1.tgz#d514fedad95740c12c2d7fc70ea863eb51ade375"
   integrity sha512-8hmiGIJMDlwjg7dlJ4yKGLK8EsYqKgPWbG3b4wjJddKNwc7N7Dpn08Df4szr/sZdMVeOstrdYSsqzX6BYbcB+w==
 
+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==
+  dependencies:
+    uint8array-tools "0.0.7"
+
 tmpl@1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/tmpl/-/tmpl-1.0.5.tgz#8683e0b902bb9c20c4f726e3c0b69f36518c07cc"
@@ -3782,11 +3821,21 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
+typeforce@^1.11.5:
+  version "1.18.0"
+  resolved "https://registry.yarnpkg.com/typeforce/-/typeforce-1.18.0.tgz#d7416a2c5845e085034d70fcc5b6cc4a90edbfdc"
+  integrity sha512-7uc1O8h1M1g0rArakJdf0uLRSSgFcYexrVoKo+bzJd32gd4gDy2L/Z+8/FjPnU9ydY3pEnVPtr9FyscYY60K1g==
+
 typescript@^4.6.2:
   version "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==
+
 universalify@^0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.1.2.tgz#b646f69be3942dabcecc9d6639c80dc105efaa66"
@@ -3870,6 +3919,13 @@ which@^2.0.1:
   dependencies:
     isexe "^2.0.0"
 
+wif@^2.0.6:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/wif/-/wif-2.0.6.tgz#08d3f52056c66679299726fade0d432ae74b4704"
+  integrity sha1-CNP1IFbGZnkplyb63g1DKudLRwQ=
+  dependencies:
+    bs58check "<3.0.0"
+
 word-wrap@~1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/word-wrap/-/word-wrap-1.2.3.tgz#610636f6b1f703891bd34771ccb17fb93b47079c"