diff --git a/__tests__/ec.test.ts b/__tests__/ec.test.ts
new file mode 100644
index 000000000..262c637f4
--- /dev/null
+++ b/__tests__/ec.test.ts
@@ -0,0 +1,51 @@
+import { pedersen as pedersenReal } from '@authereum/starkware-crypto';
+import { BigNumber } from '@ethersproject/bignumber';
+import { ensure0x, ensureNo0x, hashCalldata, hashMessage } from '../src';
+import { getKeyPair, getStarkKey, pedersen, sign } from '../src/ec';
+
+test('does work with package', () => {
+  const pk = '0x019800ea6a9a73f94aee6a3d2edf018fc770443e90c7ba121e8303ec6b349279';
+  const pair = getKeyPair(pk);
+  // somehow needed, returns error else
+  expect(BigNumber.from(getStarkKey(pair)).toHexString()).toBe(
+    '0x033f45f07e1bd1a51b45fc24ec8c8c9908db9e42191be9e169bfcac0c0d99745'
+  );
+});
+
+test('pedersen', () => {
+  const real = ensure0x(pedersenReal(['0x12773', '0x872362']));
+  const own = pedersen(['0x12773', '0x872362']);
+  // somehow needed, returns error else
+  expect(own).toBe(real);
+});
+
+test('hashCalldata()', () => {
+  const array = ['1', '2', '3', '4'];
+  expect(hashCalldata(array)).toBe(
+    '0x1439c58e1c389a2ac51f8462ecc0a4ec7f812be1c04e3b82ce2af1c2cf959ef'
+  );
+  expect(array).toStrictEqual(['1', '2', '3', '4']);
+
+  expect(hashCalldata(['1', '2'])).toBe(
+    '0x2ab889bd35e684623df9b4ea4a4a1f6d9e0ef39b67c1293b8a89dd17e351235'
+  );
+});
+test('hashMessage()', () => {
+  const pk = '0x019800ea6a9a73f94aee6a3d2edf018fc770443e90c7ba121e8303ec6b349279';
+  const hashMsg = hashMessage(
+    '0x33f45f07e1bd1a51b45fc24ec8c8c9908db9e42191be9e169bfcac0c0d99745',
+    '5',
+    '6',
+    ['1', '2'],
+    '2'
+  );
+  expect(hashMsg).toBe('0xf7ec4a68876819eed838be83b5d5dc337081f4a5fb8e421f3d9bdef7c69e9b');
+  const keyPair = getKeyPair(pk);
+  const { r, s } = sign(keyPair, ensureNo0x(hashMsg));
+  expect(BigNumber.from(ensure0x(r.toString('hex')))).toStrictEqual(
+    BigNumber.from('2699852629692218907583414128365108566181098618321049245303767746418549764831')
+  );
+  expect(BigNumber.from(ensure0x(s.toString('hex')))).toStrictEqual(
+    BigNumber.from('2362979021721299440845279407227912881357338080403308888611869245024056250189')
+  );
+});
diff --git a/__tests__/math.test.ts b/__tests__/math.test.ts
new file mode 100644
index 000000000..632e63f32
--- /dev/null
+++ b/__tests__/math.test.ts
@@ -0,0 +1,54 @@
+import { getKeyPair, getStarkKey, getStarkPublicKey } from '@authereum/starkware-crypto';
+import { BigNumber } from '@ethersproject/bignumber';
+import { ensure0x, ensureNo0x } from '../src';
+import { ecAdd, igcdex, privateToStarkKey } from '../src/math';
+
+describe('igcdex()', () => {
+  test('works with (0, 0)', () => {
+    const result = igcdex(BigNumber.from(0), BigNumber.from(0));
+
+    expect(result).toStrictEqual([BigNumber.from(0), BigNumber.from(1), BigNumber.from(0)]);
+  });
+  test('works with (0, 2004)', () => {
+    const result = igcdex(BigNumber.from(0), BigNumber.from(2004));
+
+    expect(result).toStrictEqual([BigNumber.from(0), BigNumber.from(1), BigNumber.from(2004)]);
+  });
+  test('works with (100, 0)', () => {
+    const result = igcdex(BigNumber.from(100), BigNumber.from(0));
+
+    expect(result).toStrictEqual([BigNumber.from(1), BigNumber.from(0), BigNumber.from(100)]);
+  });
+  test('works with (100, 2004)', () => {
+    const result = igcdex(BigNumber.from(100), BigNumber.from(2004));
+
+    expect(result).toStrictEqual([BigNumber.from(-20), BigNumber.from(1), BigNumber.from(4)]);
+  });
+});
+describe('ecAdd()', () => {
+  test('works with ([10,20], [21,32], 5)', () => {
+    const result = ecAdd(
+      [BigNumber.from(10), BigNumber.from(20)],
+      [BigNumber.from(21), BigNumber.from(32)],
+      BigNumber.from(5)
+    );
+    expect(result).toStrictEqual([BigNumber.from(3), BigNumber.from(4)]);
+  });
+});
+describe('privateToStarkKey()', () => {
+  test('works with valid pk', () => {
+    const pk = '0x019800ea6a9a73f94aee6a3d2edf018fc770443e90c7ba121e8303ec6b349279';
+    const pub = privateToStarkKey(pk);
+
+    expect(pub).toBe('0x033f45f07e1bd1a51b45fc24ec8c8c9908db9e42191be9e169bfcac0c0d99745');
+  });
+  test('doesnt work with package', () => {
+    const pk = ensureNo0x('0x019800ea6a9a73f94aee6a3d2edf018fc770443e90c7ba121e8303ec6b349279');
+    const pair = getKeyPair(pk);
+    // somehow needed, returns error else
+    getStarkPublicKey(pair);
+    expect(BigNumber.from(ensure0x(getStarkKey(pair))).toHexString()).toBe(
+      '0x033f45f07e1bd1a51b45fc24ec8c8c9908db9e42191be9e169bfcac0c0d99745'
+    );
+  });
+});
diff --git a/__tests__/wallet.test.ts b/__tests__/wallet.test.ts
new file mode 100644
index 000000000..56121b847
--- /dev/null
+++ b/__tests__/wallet.test.ts
@@ -0,0 +1,169 @@
+import { BigNumber } from '@ethersproject/bignumber';
+
+import fs from 'fs';
+import {
+  hashMessage,
+  CompiledContract,
+  Contract,
+  deployContract,
+  JsonParser,
+  waitForTx,
+  randomAddress,
+  getSelectorFromName,
+  ensure0x,
+  getStarkKey,
+  getKeyPair,
+  sign,
+} from '../src';
+
+describe('getStarkAccountFromPk()', () => {
+  test('it works with valid pk', () => {
+    const pk = '0xb696427c0d79c5d28a1fa6f748bae1b98b3f4b86bd1a2505bab144673c856fa9';
+
+    const starkKeyPair = getKeyPair(pk);
+    const starkKey = getStarkKey(starkKeyPair);
+
+    expect(starkKey).toBe('0x060d46f8d7ef3d83ed05f3ed9beb91e22f9529289b9d863683fd71eafaf28035');
+  });
+  test('it works with valid pk', () => {
+    const pk = '0x5f65099e269b080000000000000000000000000000000000000000000000000';
+
+    const starkKeyPair = getKeyPair(pk);
+    const starkKey = getStarkKey(starkKeyPair);
+
+    expect(starkKey).toBe('0xf321e59b257a577836d8313150aabd21f412491358c329966218df76bab591');
+  });
+});
+
+const compiledArgentAccount: CompiledContract = JsonParser.parse(
+  fs.readFileSync('./__mocks__/ArgentAccount.json').toString('ascii')
+);
+const compiledErc20: CompiledContract = JsonParser.parse(
+  fs.readFileSync('./__mocks__/ERC20.json').toString('ascii')
+);
+
+describe('deploy and test Wallet', () => {
+  const pk = randomAddress();
+
+  // eslint-disable-next-line no-console
+  console.log('PK:', pk);
+
+  const starkKeyPair = getKeyPair(pk);
+  const walletAddress = getStarkKey(starkKeyPair);
+  const wallet = new Contract(compiledArgentAccount.abi, walletAddress);
+  const erc20Address = getStarkKey(getKeyPair(randomAddress()));
+  const erc20 = new Contract(compiledErc20.abi, erc20Address);
+  beforeAll(async () => {
+    const { code: codeErc20, tx_id: txErc20 } = await deployContract(compiledErc20, erc20Address);
+    // I want to show the tx number to the tester, so he/she can trace the transaction in the explorer.
+    // eslint-disable-next-line no-console
+    console.log('deployed erc20', txErc20);
+    expect(codeErc20).toBe('TRANSACTION_RECEIVED');
+
+    const { code, tx_id } = await deployContract(compiledArgentAccount, walletAddress);
+    // I want to show the tx number to the tester, so he/she can trace the transaction in the explorer.
+    // eslint-disable-next-line no-console
+    console.log('deployed wallet', tx_id);
+    expect(code).toBe('TRANSACTION_RECEIVED');
+
+    const { code: code2, tx_id: txId2 } = await wallet.invoke('initialize', {
+      signer: walletAddress,
+      guardian: '0',
+      L1_address: '0',
+      self_address: walletAddress,
+    });
+
+    // I want to show the tx number to the tester, so he/she can trace the transaction in the explorer.
+    // eslint-disable-next-line no-console
+    console.log('initialized wallet', txId2);
+    expect(code2).toBe('TRANSACTION_RECEIVED');
+
+    const { code: codeErc20Mint, tx_id: txErc20Mint } = await erc20.invoke('mint', {
+      recipient: walletAddress,
+      amount: '1000',
+    });
+
+    // I want to show the tx number to the tester, so he/she can trace the transaction in the explorer.
+    // eslint-disable-next-line no-console
+    console.log('mint erc20', txErc20Mint);
+    expect(codeErc20Mint).toBe('TRANSACTION_RECEIVED');
+
+    await waitForTx(txErc20Mint);
+  });
+  test('read nonce', async () => {
+    const { nonce } = await wallet.call('get_current_nonce');
+
+    expect(BigNumber.from(nonce)).toStrictEqual(BigNumber.from(0));
+  });
+  test('read balance of wallet', async () => {
+    const { res } = await erc20.call('balance_of', {
+      user: walletAddress,
+    });
+
+    expect(BigNumber.from(res)).toStrictEqual(BigNumber.from(1000));
+  });
+  test('execute by wallet owner', async () => {
+    const { nonce } = await wallet.call('get_current_nonce');
+    const msgHash = ensure0x(
+      hashMessage(
+        walletAddress,
+        erc20Address,
+        getSelectorFromName('transfer'),
+        [erc20Address, '10'],
+        nonce.toString()
+      )
+    );
+    console.log(msgHash);
+    const { r, s } = sign(starkKeyPair, msgHash);
+    const { code, tx_id } = await wallet.invoke('execute', {
+      to: erc20Address,
+      selector: getSelectorFromName('transfer'),
+      calldata: [erc20Address, '10'],
+      nonce: nonce.toString(),
+      sig: [ensure0x(r.toString('hex')), ensure0x(s.toString('hex'))],
+    });
+
+    // I want to show the tx number to the tester, so he/she can trace the transaction in the explorer.
+    // eslint-disable-next-line no-console
+    console.log('transfer erc20 using wallet execute', tx_id);
+    expect(code).toBe('TRANSACTION_RECEIVED');
+
+    await waitForTx(tx_id);
+  });
+  test('read balance of wallet after transfer', async () => {
+    const { res } = await erc20.call('balance_of', {
+      user: walletAddress,
+    });
+
+    expect(BigNumber.from(res)).toStrictEqual(BigNumber.from(990));
+  });
+});
+
+test('build tx', async () => {
+  const pk = '0x1B69B4BE052FAB1';
+  const keyPair = getKeyPair(pk);
+  const address = getStarkKey(keyPair);
+
+  expect(address).toBe('0x04024999b9574cb7623679ce049a609db62a95098982c5b28ac61abdebd1c82b');
+
+  const selector = getSelectorFromName('transfer');
+
+  expect(selector).toBe(
+    BigNumber.from(
+      '232670485425082704932579856502088130646006032362877466777181098476241604910'
+    ).toHexString()
+  );
+
+  const msgHash = hashMessage(address, '1', selector, ['6', '7'], '0');
+  expect(BigNumber.from(msgHash)).toStrictEqual(
+    BigNumber.from('2221651675559331189881349481637314109810712322791057846116415219218634672652')
+  );
+
+  const { r, s } = sign(keyPair, msgHash);
+  expect(r.toString()).toBe(
+    '2220702546012141050051149396887481489960265709213083422658245644097500180866'
+  );
+  expect(s.toString()).toBe(
+    '1542316446019190634489932498001415389924394685441251344076931639569381539117'
+  );
+});
diff --git a/package-lock.json b/package-lock.json
index c959f0ee3..4ffbe9d17 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,11 +9,17 @@
       "version": "1.1.1",
       "license": "MIT",
       "dependencies": {
+        "@authereum/starkware-crypto": "^1.9.7-beta.7",
         "@ethersproject/bignumber": "^5.5.0",
         "axios": "^0.23.0",
+        "buffer": "^6.0.3",
+        "elliptic": "^6.5.4",
+        "enc-utils": "^3.0.0",
         "ethereum-cryptography": "^0.2.0",
+        "hash.js": "^1.1.7",
         "json-bigint": "^1.0.0",
-        "pako": "^2.0.4"
+        "pako": "^2.0.4",
+        "secp256k1": "^4.0.2"
       },
       "devDependencies": {
         "@babel/preset-env": "^7.15.8",
@@ -25,9 +31,11 @@
         "@semantic-release/git": "^10.0.0",
         "@semantic-release/npm": "^8.0.2",
         "@semantic-release/release-notes-generator": "^10.0.2",
+        "@types/elliptic": "^6.4.13",
         "@types/jest": "^27.0.2",
         "@types/json-bigint": "^1.0.1",
         "@types/pako": "^1.0.2",
+        "@types/secp256k1": "^4.0.3",
         "@typescript-eslint/eslint-plugin": "^5.0.0",
         "@typescript-eslint/parser": "^5.0.0",
         "eslint": "^7.32.0",
@@ -44,6 +52,49 @@
         "typescript": "^4.4.4"
       }
     },
+    "node_modules/@authereum/starkware-crypto": {
+      "version": "1.9.7-beta.7",
+      "resolved": "https://registry.npmjs.org/@authereum/starkware-crypto/-/starkware-crypto-1.9.7-beta.7.tgz",
+      "integrity": "sha512-1jEP6oLCTi1vRdnuTeCm2YA7g0WUSmQq4fvC3h6PhFPLPRZAYtnO13TPli+w3KAYYWrC5DfhGH161Quv3VVgQg==",
+      "dependencies": {
+        "@authereum/starkware-types": "1.2.0-beta.1",
+        "bip39": "^3.0.2",
+        "bn.js": "^5.1.2",
+        "elliptic": "^6.5.3",
+        "enc-utils": "^2.2.2",
+        "ethereumjs-wallet": "^1.0.0",
+        "hash.js": "^1.1.7",
+        "js-sha3": "^0.8.0",
+        "keccak256": "^1.0.2",
+        "rsv-signature": "^1.1.0",
+        "web3-utils": "^1.3.0"
+      }
+    },
+    "node_modules/@authereum/starkware-crypto/node_modules/bn.js": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
+    },
+    "node_modules/@authereum/starkware-crypto/node_modules/enc-utils": {
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/enc-utils/-/enc-utils-2.2.3.tgz",
+      "integrity": "sha512-+CGYNRNRtz9ONgeykAgI9WUvaQhoYDtoc0g8ZP0JZCNTPsDdivNr8VWpjScOM0oDw4lB/Rcbo1DqKyF1TTUVqQ==",
+      "dependencies": {
+        "bn.js": "4.11.8",
+        "is-typedarray": "1.0.0",
+        "typedarray-to-buffer": "3.1.5"
+      }
+    },
+    "node_modules/@authereum/starkware-crypto/node_modules/enc-utils/node_modules/bn.js": {
+      "version": "4.11.8",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
+      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
+    },
+    "node_modules/@authereum/starkware-types": {
+      "version": "1.2.0-beta.1",
+      "resolved": "https://registry.npmjs.org/@authereum/starkware-types/-/starkware-types-1.2.0-beta.1.tgz",
+      "integrity": "sha512-7TOskv42zRtKItSTMnKdgNdXWxP0JyydjwFiibGeuDDFJ3bGB4iNGEpwsCx7DThKm95zge7Bap7BRsuwL/yjhw=="
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.12.11",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
@@ -2918,6 +2969,23 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "node_modules/@types/bn.js": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+      "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/elliptic": {
+      "version": "6.4.13",
+      "resolved": "https://registry.npmjs.org/@types/elliptic/-/elliptic-6.4.13.tgz",
+      "integrity": "sha512-e8iyLJ8vMLpWxXpVWrIt0ujqsfHWgVe5XAz9IMhBYoDirK6th7J+mHjzp797OLc62ZX419nrlwwzsNAA0a0mKg==",
+      "dev": true,
+      "dependencies": {
+        "@types/bn.js": "*"
+      }
+    },
     "node_modules/@types/graceful-fs": {
       "version": "4.1.5",
       "resolved": "https://registry.npmjs.org/@types/graceful-fs/-/graceful-fs-4.1.5.tgz",
@@ -2988,8 +3056,7 @@
     "node_modules/@types/node": {
       "version": "16.11.1",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-16.11.1.tgz",
-      "integrity": "sha512-PYGcJHL9mwl1Ek3PLiYgyEKtwTMmkMw4vbiyz/ps3pfdRYLVv+SN7qHVAImrjdAXxgluDEw6Ph4lyv+m9UpRmA==",
-      "dev": true
+      "integrity": "sha512-PYGcJHL9mwl1Ek3PLiYgyEKtwTMmkMw4vbiyz/ps3pfdRYLVv+SN7qHVAImrjdAXxgluDEw6Ph4lyv+m9UpRmA=="
     },
     "node_modules/@types/normalize-package-data": {
       "version": "2.4.1",
@@ -3009,12 +3076,28 @@
       "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA==",
       "dev": true
     },
+    "node_modules/@types/pbkdf2": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@types/pbkdf2/-/pbkdf2-3.1.0.tgz",
+      "integrity": "sha512-Cf63Rv7jCQ0LaL8tNXmEyqTHuIJxRdlS5vMh1mj5voN4+QFhVZnlZruezqpWYDiJ8UTzhP0VmeLXCmBk66YrMQ==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/prettier": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/@types/prettier/-/prettier-2.4.1.tgz",
       "integrity": "sha512-Fo79ojj3vdEZOHg3wR9ksAMRz4P3S5fDB5e/YWZiFnyFQI1WY2Vftu9XoXVVtJfxB7Bpce/QTqWSSntkz2Znrw==",
       "dev": true
     },
+    "node_modules/@types/secp256k1": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/@types/secp256k1/-/secp256k1-4.0.3.tgz",
+      "integrity": "sha512-Da66lEIFeIz9ltsdMZcpQvmrmmoqrfju8pm1BH8WbYjZSwUgCwXLb9C+9XYogwBITnbsSaMdVPb2ekf7TV+03w==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/stack-utils": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-2.0.1.tgz",
@@ -3266,6 +3349,11 @@
         "node": ">=0.4.0"
       }
     },
+    "node_modules/aes-js": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.1.2.tgz",
+      "integrity": "sha512-e5pEa2kBnBOgR4Y/p20pskXI74UEz7de8ZGVo58asOtvSVG5YAbJeELPZxOmt+Bnz3rX753YKhfIn4X4l1PPRQ=="
+    },
     "node_modules/agent-base": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
@@ -3667,6 +3755,33 @@
       "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
       "dev": true
     },
+    "node_modules/base-x": {
+      "version": "3.0.9",
+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.9.tgz",
+      "integrity": "sha512-H7JU6iBHTal1gp56aKoaa//YUxEaAOUiydvrV/pILqIHXTtqxSkATOnDA2u+jZ/61sD+L/412+7kzXRtWukhpQ==",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
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+    },
     "semver": {
       "version": "7.3.5",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
@@ -21128,6 +22389,20 @@
       "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w=",
       "dev": true
     },
+    "setimmediate": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
+      "integrity": "sha1-KQy7Iy4waULX1+qbg3Mqt4VvgoU="
+    },
+    "sha.js": {
+      "version": "2.4.11",
+      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
+      "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
+      "requires": {
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -21300,7 +22575,6 @@
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
       "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
-      "dev": true,
       "requires": {
         "safe-buffer": "~5.1.0"
       }
@@ -21392,6 +22666,14 @@
       "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
       "dev": true
     },
+    "strip-hex-prefix": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/strip-hex-prefix/-/strip-hex-prefix-1.0.0.tgz",
+      "integrity": "sha1-DF8VX+8RUTczd96du1iNoFUA428=",
+      "requires": {
+        "is-hex-prefixed": "1.0.0"
+      }
+    },
     "strip-indent": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-3.0.0.tgz",
@@ -21673,7 +22955,6 @@
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
       "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
-      "dev": true,
       "requires": {
         "is-typedarray": "^1.0.0"
       }
@@ -21768,11 +23049,20 @@
         "punycode": "^2.1.0"
       }
     },
+    "utf8": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/utf8/-/utf8-3.0.0.tgz",
+      "integrity": "sha512-E8VjFIQ/TyQgp+TZfS6l8yp/xWppSAHzidGiRrqe4bK4XP9pTRyKFgGJpO3SN7zdX4DeomTrwaseCHovfpFcqQ=="
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+    },
+    "uuid": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
+      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg=="
     },
     "v8-compile-cache": {
       "version": "2.3.0",
@@ -21842,6 +23132,20 @@
         "makeerror": "1.0.x"
       }
     },
+    "web3-utils": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.6.0.tgz",
+      "integrity": "sha512-bgCAWAeQnJF035YTFxrcHJ5mGEfTi/McsjqldZiXRwlHK7L1PyOqvXiQLE053dlzvy1kdAxWl/sSSfLMyNUAXg==",
+      "requires": {
+        "bn.js": "^4.11.9",
+        "ethereum-bloom-filters": "^1.0.6",
+        "ethereumjs-util": "^7.1.0",
+        "ethjs-unit": "0.1.6",
+        "number-to-bn": "1.7.0",
+        "randombytes": "^2.1.0",
+        "utf8": "3.0.0"
+      }
+    },
     "webidl-conversions": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-6.1.0.tgz",
diff --git a/package.json b/package.json
index d851293e3..415d52881 100644
--- a/package.json
+++ b/package.json
@@ -35,9 +35,11 @@
     "@semantic-release/git": "^10.0.0",
     "@semantic-release/npm": "^8.0.2",
     "@semantic-release/release-notes-generator": "^10.0.2",
+    "@types/elliptic": "^6.4.13",
     "@types/jest": "^27.0.2",
     "@types/json-bigint": "^1.0.1",
     "@types/pako": "^1.0.2",
+    "@types/secp256k1": "^4.0.3",
     "@typescript-eslint/eslint-plugin": "^5.0.0",
     "@typescript-eslint/parser": "^5.0.0",
     "eslint": "^7.32.0",
@@ -54,11 +56,17 @@
     "typescript": "^4.4.4"
   },
   "dependencies": {
+    "@authereum/starkware-crypto": "^1.9.7-beta.7",
     "@ethersproject/bignumber": "^5.5.0",
     "axios": "^0.23.0",
+    "buffer": "^6.0.3",
+    "elliptic": "^6.5.4",
+    "enc-utils": "^3.0.0",
     "ethereum-cryptography": "^0.2.0",
+    "hash.js": "^1.1.7",
     "json-bigint": "^1.0.0",
-    "pako": "^2.0.4"
+    "pako": "^2.0.4",
+    "secp256k1": "^4.0.2"
   },
   "lint-staged": {
     "*.ts": "eslint --cache --fix",
diff --git a/src/constants.ts b/src/constants.ts
index 2283cf10f..e373b13c4 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -1,3 +1,2037 @@
 export const CONTRACT_ADDRESS_BITS = 251;
 export const CONTRACT_ADDRESS_LOWER_BOUND = 1;
 export const CONTRACT_ADDRESS_UPPER_BOUND = 2 ** CONTRACT_ADDRESS_BITS;
+
+export const FIELD_PRIME = '800000000000011000000000000000000000000000000000000000000000001';
+export const FIELD_GEN = '3';
+export const EC_ORDER = '800000000000010FFFFFFFFFFFFFFFFB781126DCAE7B2321E66A241ADC64D2F';
+export const ALPHA = '1';
+export const BETA = '6F21413EFBE40DE150E596D72F7A8C5609AD26C15C915C1F4CDFCB99CEE9E89';
+export const MAX_ECDSA_VAL = '800000000000000000000000000000000000000000000000000000000000000';
+
+export const CONSTANT_POINTS = [
+  [
+    '49ee3eba8c1600700ee1b87eb599f16716b0b1022947733551fde4050ca6804',
+    '3ca0cfe4b3bc6ddf346d49d06ea0ed34e621062c0e056c1d0405d266e10268a',
+  ],
+  [
+    '1ef15c18599971b7beced415a40f0c7deacfd9b0d1819e03d723d8bc943cfca',
+    '5668060aa49730b7be4801df46ec62de53ecd11abe43a32873000c36e8dc1f',
+  ],
+  [
+    '234287dcbaffe7f969c748655fca9e58fa8120b6d56eb0c1080d17957ebe47b',
+    '3b056f100f96fb21e889527d41f4e39940135dd7a6c94cc6ed0268ee89e5615',
+  ],
+  [
+    '3909690e1123c80678a7ba0fde0e8447f6f02b3f6b960034d1e93524f8b476',
+    '7122e9063d239d89d4e336753845b76f2b33ca0d7f0c1acd4b9fe974994cc19',
+  ],
+  [
+    '40fd002e38ea01a01b2702eb7c643e9decc2894cbf31765922e281939ab542c',
+    '109f720a79e2a41471f054ca885efd90c8cfbbec37991d1b6343991e0a3e740',
+  ],
+  [
+    '2f52066635c139fc2f64eb0bd5e3fd7a705f576854ec4f00aa60361fddb981b',
+    '6d78a24d8a5f97fc600318ce16b3c840315979c3273078ec1a285f217ee6a26',
+  ],
+  [
+    '6a0767a1fd60d5b9027a35af1b68e57a1c366ebcde2006cdd07af27043ef674',
+    '606b72c0ca0498b8c1817ed7922d550894c324f5efdfc85a19a1ae382411ca2',
+  ],
+  [
+    '7fa463ee2a2d6a585d5c3358918270f6c28c66df1f86803374d1edf3819cc62',
+    'a996edf01598832e644e1cae9a37288865ad80e2787f9bf958aceccc99afae',
+  ],
+  [
+    '3d4da70d1540da597dbae1651d28487604a4e66a4a1823b97e8e9639393dbec',
+    '45cdef70c35d3b6f0a2273a9886ccb6306d813e8204bdfd30b4efee63c8a3f9',
+  ],
+  [
+    '1e448fdbcd9896c6fbf5f36cb7e7fcb77a751ff2d942593cae023363cc7750e',
+    '30c81da0f3a8cb64468eaa491c7ae7b4842b62cb4148820da211afc4caffb3a',
+  ],
+  [
+    '6531acf1a7cb90a4eb27de0b7f915e387a3b0fd063ba6e1289b91f48411be26',
+    '31330f5daa091889981a3ea782ae997f5f171336ed0487a03f051551a2cafa2',
+  ],
+  [
+    '54be016394d5662d67d7e82f5e889ed2f97ccf95d911f57dd2362c4040ed4f4',
+    'c6cb184053f054d6a59c1bf0986d17090d25089b3fdcdaf185edc87ef113e5',
+  ],
+  [
+    '35b9ecd0499ca1d5d42dcbb0c6b4042b3733c64b607ca711e706e786ef2afc6',
+    '5624b476a5b21c3a544f0712d4817b06ad380a5a6529d323bf64da8ef862d8d',
+  ],
+  [
+    '4ce0378e3ee8f77ed58f2ddbd8bb7676c8a38bfb1d3694c275254bd8ca38e23',
+    '5a16fcbff0769c9cf2b02c31621878ec819fff4b8231bff82c6183db2746820',
+  ],
+  [
+    '648d5c6f98680a1b926bfeb01c00224c56fdcf751b251c4449c8a94f425cfcf',
+    '72c05ac793cd1620a833fbe2214d36900ebe446e095c62fcb740937f98cca8c',
+  ],
+  [
+    'bd09be3e4e1af8a14189977e334f097c18e4a8bf42577ef5aafa0f807bd89b',
+    '6e0e72ed7eb65c86cee29c411fb4761122558ee81013344ba8509c49de9f9b6',
+  ],
+  [
+    '35ea4e339b44ae7724419bdfbe07022253137a4afb7cbaffad341ea61249357',
+    '3665d676a026a174f367bb4417780e53a7803cb02d0db32eb4545c267c42f14',
+  ],
+  [
+    '36457bc744f42e697b825c2d1afd8f4029d696a4514710f81da52d88e178643',
+    '7c93715896735492a68c7969a024b3a8fd538bffc1521538107de1a5f13ce9c',
+  ],
+  [
+    '5b3a08ebcf9c109cc9082f70d9df2b9c11b5428ee23917b4e790c4c10f6e661',
+    '9d7b42ab0c20f5510df7ea5e196eec99342739077e9a168198c89da859753',
+  ],
+  [
+    '21883ef8580fc06e59481955d52ece3aca6e82c8c9fc58e216dcf46f96990c6',
+    '51a6423543e6e8a43e71da34cd90f5b520b8d33b67c4bf857573ab9e301aa4c',
+  ],
+  [
+    '19e86b77f9b581e81092b305c852faf53940a8f15f0a6990c414f04c0fa7ef9',
+    '515630e35d4398c9c79fc4ee08e1023fa47d8e03c6e7819c6d2ccef45398fa',
+  ],
+  [
+    '888ab8eb4c31bb2ac5b54aa320dbe1a69c96b864e8a5f54d89c1d1a6b86c24',
+    '730e148467f6a55ce22c5296f5380df88f38de76ef0b2de844cd3094aaaf3ea',
+  ],
+  [
+    '75e79ff13a894e7120dac17b7429c0c32ce7828f726c9973728c0977a5f5977',
+    '4960526e59c1c736561a201bc56f7d762641b39f609d273cc996f5d9197cfb8',
+  ],
+  [
+    '640fe009249115d7254f72ecafb3006139e4bed7e9041af51458c737282d1d5',
+    '3cc6c978a575246e2ce4f7ef1fcc7f63085db9ff98a1b1f3fe374087c0332c',
+  ],
+  [
+    '6d6fd09ccab7c26de9b3906191235deb5c34685580c488275356a05e209ca96',
+    '7157f81a34213dd8f91dea4f6df1bcfabc4ee091a3049eeeb3b7923d39b8645',
+  ],
+  [
+    '5531ca1d00f151d71da820918f74caf2985b24dca20e124721fff507b5a5876',
+    '518529643d3f25e47f72c322223ba60a63d6bfe78cf3f612215d9c19bf29200',
+  ],
+  [
+    '6192d454e4f8fe212bdfccd5b15dd5056d7622ffe456c6c67e5a7265aea49c4',
+    '2377a45dc630017ae863cb968ddb38333a70c7946d8684e6d7a6213f634b7bc',
+  ],
+  [
+    '542fb44b4ef3640a64fdb22a2560fb26668065c069cf31d1df424819a39ff18',
+    '5dbae9b0948e0361aea443503840341c322aa1a1366ce5390e71bf161f78f8c',
+  ],
+  [
+    '299ff3e3412a7eb4cb4a3051b07b1be2e7b1c4b789f39ffb52cba3d048b71de',
+    '1951d3175c02761b291d86b6c0a08387ad5e2a2130ccc33c852530572cb3958',
+  ],
+  [
+    '628ce3f5367dadc1411133e55eb25e2e3c2880d6e28754a5cb1c5d109627e73',
+    'ae3e9b7d50964e28bd15380400b7659b87affdef5d2586cbefcd9be7d67c0d',
+  ],
+  [
+    '6ea54aff064895eccf9db2283225d62044ae67621192b3346338948382f5933',
+    '6431507e51aadacfaf39f102a8ff387756e9b5e1bc8323d44acae55130d93db',
+  ],
+  [
+    '28097d50d175a6235320fe8cfe138dd9e46895d189582e472c38ad7a67d923a',
+    '7f9eab4133d7d09a7ff63368d6135c26262b62336eca1b5ca33f2096ce388ba',
+  ],
+  [
+    '619fd09cdd6ff4323973f256c2cbdcb224f7f25b8aef623af2d4a0105e62e02',
+    '2c95f0ae11d47eeae1bc7f1350f75f9185c5bc840382ceb38a797cae9c40308',
+  ],
+  [
+    '641c18982ced304512a3f2395942a38add0d6a7156229c2a7c8b8dfbe9beb96',
+    '6f6288c9c659b6af5ac975f4180deffe53d516399b2cc62f31732e9d4ba9837',
+  ],
+  [
+    '58ab546e51fe49fc5a382e4064a2bd6cfc268904412f86c26de14f28a71d0f2',
+    '124b7217943e7e328408e8afdfa7da00dcbc94a2bb85fd8e01fb162d2c2c0a9',
+  ],
+  [
+    'a82c2fdedbb26c3c762a12f7e86b0e01e65320e0a25a8399d665f6e266bf74',
+    '1a1de28e253f3e10f44d0111e8074f882d7f42e5900780ccbdc31da372d3fd8',
+  ],
+  [
+    '744c725a7455a992e3cf5bd007bc234dd4668dba285f553f38350ad94c1615b',
+    '7f721a87f48798bdc4a9c0eb88559e2ad7a74112fd901e70ea159e67a9c33f',
+  ],
+  [
+    '434df142ddaa60f7881b6348d91687de40457de7ccfb07f0304b9e820705d0c',
+    '7fae425e3b53f97dd1f5b20e49ed9fe24ff1efc341ba5e017ac89cf8df0cc39',
+  ],
+  [
+    '7a1e2b809dff46277021cbc376f79c37e1b683bbd6bca5317014f0dc0e1ae73',
+    '56790278a231912c334eff05281e08af1558e85516b4411ef64647c13bea431',
+  ],
+  [
+    '4931b7990348d41cf8907be79f45bb7991fd18f8a57868351c92fa7a34cbcd7',
+    'ca35091815cdf0837d396e25aad6052ad32d497a33b123256cffdc008bc50e',
+  ],
+  [
+    '250b815d352fd89f8210b624b147ea7d0a4f47bcac49f3ac9b777840da93ebe',
+    '1173f10e9691948b7da7632f328520455aadcba46e017f891e0a1d7da2bef04',
+  ],
+  [
+    '2223b85032fa67292f6e1f822628e6756e5c3cc08fc252ab88d63d624e4dfb2',
+    '55619ba96a7dcec77832fcb22cd5c21c7dcebc0280d730cba0002b67e0a8c63',
+  ],
+  [
+    '249b131e04de73af9820d3e22492d9ec51bdc0c4c4f34d95352fa44dd61f245',
+    '7576d3b5d136368ff01170a77d8286d0d1c7c40688862fb40813b4af3c6065e',
+  ],
+  [
+    '6777915d9b4769027eb7e04733f8a2d669c84fe06080f55e8a55674dfbf9efb',
+    '640d0ff384c9635e1af364760f104e058e3c86209fa9d2320aeac887b2e02d8',
+  ],
+  [
+    '2abe3f237681052f002414399111cf07f8421535af41251edc427a36b5b19c9',
+    '636ce4deaf468a503ab20ccb2f7e5bdc98551656ebf53e9c7786b11dd9090be',
+  ],
+  [
+    '4d5cc5414758ea1be55be779bd7da296c7e11f1564d9e8797ceea347c16f8ea',
+    '1a680c4c410cf5ddc74e95ff2897c193edaaecce5b2cde4e96bbae5c0054eff',
+  ],
+  [
+    '46c375c684b30adf4d51de81e92afee52b1a3847e177403372c82109373edca',
+    '1eaadc5783c90a0261306423d52009e991126b3f620e9cb6cffca41ca096f4f',
+  ],
+  [
+    '2ddfb71f51205888118cbabba8fd07d460a810289bfdeeb7118707e310cb152',
+    '1fd905d07b3933be886f2518246bdafa6f33259a174668808223cd7c28183c7',
+  ],
+  [
+    '386f3879960713d41fdb3b1e41bbebf26b1c0e27a9a75bb1adcc1a0d3e8547b',
+    '2b21498c0f34ec6f17c720334dc0f36021c2f87afbbbc8847d0bd536eb265e5',
+  ],
+  [
+    '407eae62c6c4de3b942195afec3f45efec71ddb5e6edee3d427631bcdbf9b90',
+    '436e7f2d78268ef62c4172d2ff1469028bad1f1d0f97ab007064418e61caa8f',
+  ],
+  [
+    '1b881175e21201d17e095e9b3966b354f47de8c1acee5177f5909e0fd72328f',
+    '69954b1a9b8bfccf8ec384d32924518a935758f3d3662ef754bcc88f1f6f3ec',
+  ],
+  [
+    '7d545a82bff003b8115be32a0c437f7c0a98f776bcf7fddb0392822844f3c5e',
+    '34b6e53a9565a7daa010711f5bf72254a4e61da3e6a562210a9abc9e8b66d69',
+  ],
+  [
+    '299b9fcd4fadfc4b6141457a3036aaa68501c23df579de26df69d4def89b913',
+    'b95bf2c2bb303c38bb396382edc798ca6a4847e573ce19b7b08533d1912675',
+  ],
+  [
+    '551f5a4dae4a341a3e20336a7d2f365ddd45849351ec6dd4fcbedfe4806d5d5',
+    '5865c977a0ecf13ce85ae14c5c316872080bd36f0f614f56b6dfc7ece83792e',
+  ],
+  [
+    '7a1d69c08e68c80ad8b310736e6247a53bcba0183b9b8798833bc696a0fb6e2',
+    '3ce803a20ebb3b120d5eaf0ad64bed0522fad1a0f2ce39a5c5cbae98c4438f6',
+  ],
+  [
+    '28acacc0bc41d84e83663f02b36981a2c8272ecd72d3901164be2affb09c504',
+    '7a5aee0b160eaff5b5968ab1a0304ce58c3d5ae0148d9191c39e87668229e5b',
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+  ],
+  [
+    '294af33272ffcee0b56a436de1b73759cbddebef4c07888b42c2f92b0b68e1',
+    'd837164311d5dca8d37b99ef9eb22708643c83d1cbdfe852f63ea07b06fbad',
+  ],
+  [
+    '753bdb5439a19bbffdfa02b1dc24e8368f22d0a8276b109c11e6feb26f56f39',
+    '6ed396231af93647633eab467f1a034f38e76823eb85baf97cae56e2dcd9f75',
+  ],
+  [
+    '5674f0cb892b733fc0b50e121d8679afed0a925c32594cc65ffe83bebe7748e',
+    '7fbf0325dd38dd94905adab2c52758552292a6a103d9edfcb11938828e828c8',
+  ],
+  [
+    '4a8f053573a0a74251059d0229d89b6660407ba0b491779fd10f87a5117c81f',
+    '21b70112485398bf67ec9d733df24a1df30dea718a93b786f41ed04e3ae3c5e',
+  ],
+  [
+    '726c01ec4a08df8fc8de173311f50d4f3b97c5a9cf68c1536146f827db95ae8',
+    '15013cafadefa7f1c4e4dfdd70bd4d3979dd18bd7f0332572ce2a3fd8773d12',
+  ],
+  [
+    '38ac0fbfa98937257460db7e6645d7e5112b6fce7234813fc8a704e8ade8da2',
+    '73c0109f86048aad08c443f781ae60ad13b99f7b9cfdf3128fe6d6eeb799a7b',
+  ],
+  [
+    '6f6d3a38621582ace092eb50ecfe9eff265df141ebdcab8653299116fcea291',
+    '4a1bf3f39bc919c8f1b720a0b1ce952cad17f2ba98308ee6b76dd9b6f3d7b75',
+  ],
+  [
+    '6a307fc28e1df8d9ad01766419e097797d65cb674436fa1c8f012d3de2c2a1f',
+    '26911a635ba824db004875d79dd84834a97ac12643e42829015bf88c1fd6f05',
+  ],
+  [
+    '2a74860e3336d6db916555894cc8028f41508812925db1925457afe40257155',
+    '5f8da573f4c39816ce2dba8a20224223a7cfec53117ec78973930c0e9b60244',
+  ],
+  [
+    '4d2b49e1ed0799f719b8269f092cb489a466a645bc0ccabafdc678864c176d7',
+    '5410083df7d256f18cbf5697ae5e52c31e075d8a3b27e21d6f5177ca882f6c1',
+  ],
+  [
+    '110ecb9fbf6c333d168cee473cc5ad98809b6cb9eb5d1f6cd28ab5fab504fd3',
+    '7e3c54d7533d9f8c3310f219dab0cc3ea4d39b418a748eeffd6bae2b8637a43',
+  ],
+  [
+    '5be4d711b80da70e6d3ac493250bbfd16f20b25f31919b3a91cf14ffbac1096',
+    '7f55a0919f082e8885f1515e83c5b39b6022404503507498e1b4422d79c43e2',
+  ],
+  [
+    '2605125b95ca4ba93a21cbbba5762898a7cf9e988f07ab9e64cb3868e3b139d',
+    '62f0ccf55b9fc0eaf9736fc8ee484e2acdbe259813af9803cf815829a5e9d3b',
+  ],
+  [
+    '1092bbbf206f2a3068167c3dd99a72de31e206f6c504c071c8214d105ff814d',
+    '309f489f68a62089f53b96df5d4fbc3ecc5a1a42eb7ece0e49bad17ad490ff4',
+  ],
+  [
+    '2abdee9409d9c92559ca3f4e6bddd649c31aa09b90bfcb4a612af491241e18d',
+    '3ffa8eac180a29de3f8a69efca84bac046f921f5725e96a6ff0530be1436aaf',
+  ],
+  [
+    '376313f27d00bb1aae7ec991745efe6ee28c6b50de0c6cd9845cc4bb4f83543',
+    '6a8e0a9389ba528b156fa94ac090a895d7b795818d4941c29415d9e2984c547',
+  ],
+  [
+    'a80380c71bd466a696b3f0fbf02817c9459d9798f4f3899cf32edf647fe066',
+    '6a09805e814e7cdfc76eba4b79f1df5ae559e0f0aba9f728d3cba4ea5c57471',
+  ],
+  [
+    '223694b921d247d989a79b9b2b2f07496036c40cb043eab074a9d6a2cd2ffed',
+    'c247217f1b1df35e30d9e15fdaadf42d6fb0edd3a5a7e265d4cdc426c120aa',
+  ],
+  [
+    '102333620df278c6714bbc880fc087db58c1b9b4d77ed4d61b32a74bfc7c3e2',
+    '6a77d37727ccf71c2caeb151faf4404d4b94e9047f9f0a7c3966367f3b53c65',
+  ],
+  [
+    '891626f466536929ee7eadcd18b41925706dedab7528ed5f0f7abf039eb9d2',
+    '5f73d11c141c933a35b2d0d06e5cbae614a20d17dc3b439f8bcdc3413c5ea37',
+  ],
+  [
+    '215c23fd3f073f870e5e80303967391bf173f8adcdbeec72d131c557babc203',
+    '10634332e9d9439a321597dc5b0fac9ff478834c3d6e281735f21a4a5e13266',
+  ],
+  [
+    '21ea0bdc1332bc36e6aeb43be9071651c27e4ea2eadec636c8d818d4af72a36',
+    '3a523d9643dccc6bb9c7c58413312caa3e60ba9c7c7f0177e0f3f469a3241e3',
+  ],
+  [
+    '60deaed1bffb6190beed40caaf2bfab5e43d3707aff7ad3f278d571aa247eae',
+    'e41f71ff254c1418e6a66992af307789fe04d6606fb2670900bb1a089fd879',
+  ],
+  [
+    '1e1fac4a1646253fb1332fadc21fbdd3e3a24a840d129400f520ae4116a4cf5',
+    '69c406f9f46576afad68808de0ab7e8922b6226af748e721d9097e21f1800f3',
+  ],
+  [
+    '5db0ddcdf79ffe74d6454c12d2bc60b06776db03c75dc413f5be42ea9a91b5e',
+    '134c3d6c699841f17306835bb193785228ffe7ab212a01a861c56b086a18cec',
+  ],
+  [
+    '626814e320fb5bea505b248fd1c1389ad586c1cfe04923fe2f83173e915f4f8',
+    '7ae407a926e887206a8b85cf485f1f327c9bb8ccbb6897024e2d122877d8ee0',
+  ],
+  [
+    '23186237dc7d3b570cea645282ad4c359731bbfa54e7f036426bf6493812cd',
+    '7d1fbab7e61a22d3b00993290d9f4cd5d820061573e787f66c2cff9a18e1eaf',
+  ],
+  [
+    '54302dcb0e6cc1c6e44cca8f61a63bb2ca65048d53fb325d36ff12c49a58202',
+    '1b77b3e37d13504b348046268d8ae25ce98ad783c25561a879dcc77e99c2426',
+  ],
+  [
+    '13961b56b9fc0e412e468c385c22bd0680a25624ec211ffbb6bc877b2a6926c',
+    '62f7f7792c77cd981fad13cb6863fe099c4d971c1374109185eae99943f16e9',
+  ],
+  [
+    '47abd7308c70659af3f00fafe6837298af3cb530b6c2ba710ffd07a6bc1ae98',
+    '75d0c8a7377aa9f0663d0c124a5659750847afabc29e39893fd27534a4a03cb',
+  ],
+  [
+    '2c6276b764fb398fa555857dbe0ce0ec18fab7a233bf23851295739801f0585',
+    '5d8f4897ce44007ec5bfcb9aeb78b8f6e1d40a514f72d213c9300d2770d2b8c',
+  ],
+];
diff --git a/src/contract.ts b/src/contract.ts
index 78bf85f35..3dc9bc210 100644
--- a/src/contract.ts
+++ b/src/contract.ts
@@ -45,7 +45,7 @@ export class Contract {
     return this;
   }
 
-  private static compileCalldata(args: Args): Calldata {
+  public static compileCalldata(args: Args): Calldata {
     return Object.values(args).flatMap((value) => {
       if (Array.isArray(value))
         return [
@@ -73,25 +73,29 @@ export class Contract {
     // ensure args match abi type
     const methodAbi = this.abi.find((abi) => abi.name === method)!;
     methodAbi.inputs.forEach((input) => {
-      assert(args[input.name] !== undefined, `no arg for "${input.name}" provided`);
-      if (input.type === 'felt') {
-        assert(typeof args[input.name] === 'string', `arg ${input.name} should be a felt (string)`);
-        assert(
-          isFelt(args[input.name] as string),
-          `arg ${input.name} should be decimal or hexadecimal`
-        );
-      } else {
-        assert(Array.isArray(args[input.name]), `arg ${input.name} should be a felt* (string[])`);
-        (args[input.name] as string[]).forEach((felt, i) => {
+      if (args[input.name] !== undefined) {
+        if (input.type === 'felt') {
           assert(
-            typeof felt === 'string',
-            `arg ${input.name}[${i}] should be a felt (string) as part of a felt* (string[])`
+            typeof args[input.name] === 'string',
+            `arg ${input.name} should be a felt (string)`
           );
           assert(
-            isFelt(felt),
-            `arg ${input.name}[${i}] should be decimal or hexadecimal as part of a felt* (string[])`
+            isFelt(args[input.name] as string),
+            `arg ${input.name} should be decimal or hexadecimal`
           );
-        });
+        } else {
+          assert(Array.isArray(args[input.name]), `arg ${input.name} should be a felt* (string[])`);
+          (args[input.name] as string[]).forEach((felt, i) => {
+            assert(
+              typeof felt === 'string',
+              `arg ${input.name}[${i}] should be a felt (string) as part of a felt* (string[])`
+            );
+            assert(
+              isFelt(felt),
+              `arg ${input.name}[${i}] should be decimal or hexadecimal as part of a felt* (string[])`
+            );
+          });
+        }
       }
     });
   }
diff --git a/src/ec.ts b/src/ec.ts
new file mode 100644
index 000000000..4c5044168
--- /dev/null
+++ b/src/ec.ts
@@ -0,0 +1,160 @@
+import { BigNumber, BigNumberish } from '@ethersproject/bignumber';
+import hashJS from 'hash.js';
+import { ec as EC, curves } from 'elliptic';
+import { sanitizeBytes } from 'enc-utils';
+import assert from 'assert';
+import { CONSTANT_POINTS, EC_ORDER, FIELD_PRIME, MAX_ECDSA_VAL } from './constants';
+import { ensureNo0x, ensure0x } from './utils';
+
+export const ec = new EC(
+  new curves.PresetCurve({
+    type: 'short',
+    prime: null,
+    p: FIELD_PRIME,
+    a: '00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001',
+    b: '06f21413 efbe40de 150e596d 72f7a8c5 609ad26c 15c915c1 f4cdfcb9 9cee9e89',
+    n: EC_ORDER,
+    hash: hashJS.sha256,
+    gRed: false,
+    g: CONSTANT_POINTS[1],
+  })
+);
+
+export const getKeyPair = (pk: string | BigNumberish): EC.KeyPair => {
+  const pkBn = BigNumber.from(pk);
+  return ec.keyFromPrivate(ensureNo0x(pkBn.toHexString()), 'hex');
+};
+
+export const getStarkKey = (keyPair: EC.KeyPair): string => {
+  // this method needs to be run to generate the .pub property used below
+  // the result can be dumped
+  keyPair.getPublic(true, 'hex');
+  return ensure0x(sanitizeBytes((keyPair as any).pub.getX().toString(16), 2));
+};
+
+const constantPoints = CONSTANT_POINTS.map((coords: string[]) =>
+  ec.curve.point(coords[0], coords[1])
+);
+const shiftPoint = constantPoints[0];
+
+export function pedersen(input: [BigNumberish, BigNumberish]) {
+  let point = shiftPoint;
+  for (let i = 0; i < input.length; i += 1) {
+    let x = BigNumber.from(input[i]);
+    assert(
+      x.gte(BigNumber.from(0)) && x.lt(BigNumber.from(ensure0x(FIELD_PRIME))),
+      `Invalid input: ${input[i]}`
+    );
+    for (let j = 0; j < 252; j += 1) {
+      const pt = constantPoints[2 + i * 252 + j];
+      assert(!point.getX().eq(pt.getX()));
+      if (x.and(BigNumber.from(1)).toNumber() !== 0) {
+        point = point.add(pt);
+      }
+      x = x.shr(1);
+    }
+  }
+  return ensure0x(point.getX().toString(16));
+}
+
+/*
+ Asserts input is equal to or greater then lowerBound and lower then upperBound.
+ Assert message specifies inputName.
+ input, lowerBound, and upperBound should be of type BN.
+ inputName should be a string.
+*/
+function assertInRange(
+  input: BigNumber,
+  lowerBound: BigNumber,
+  upperBound: BigNumber,
+  inputName = ''
+) {
+  const messageSuffix = inputName === '' ? 'invalid length' : `invalid ${inputName} length`;
+  assert(input.gte(lowerBound) && input.lt(upperBound), `Message not signable, ${messageSuffix}.`);
+}
+
+/*
+ The function _truncateToN in lib/elliptic/ec/index.js does a shift-right of 4 bits
+ in some cases. This function does the opposite operation so that
+   _truncateToN(fixMessage(msg)) == msg.
+*/
+function fixMessage(msg: string) {
+  const pureHex = msg.replace(/^0x0*/, '');
+
+  if (pureHex.length <= 62) {
+    // In this case, pureHex should not be transformed, as the byteLength() is at most 31,
+    // so delta < 0 (see _truncateToN).
+    return pureHex;
+  }
+  assert(pureHex.length === 63);
+  // In this case delta will be 4 so we perform a shift-left of 4 bits by adding a ZERO_BN.
+  return `${pureHex}0`;
+}
+
+/*
+ Signs a message using the provided key.
+ key should be an KeyPair with a valid private key.
+ Returns an Signature.
+*/
+export function sign(keyPair: EC.KeyPair, msgHash: string): EC.Signature {
+  const msgHashBN = BigNumber.from(ensure0x(msgHash));
+  // Verify message hash has valid length.
+  assertInRange(msgHashBN, BigNumber.from(0), BigNumber.from(ensure0x(MAX_ECDSA_VAL)), 'msgHash');
+  const msgSignature = keyPair.sign(fixMessage(msgHash));
+  const { r, s } = msgSignature;
+  const w = s.invm((ec as any).n);
+  // Verify signature has valid length.
+  assertInRange(
+    BigNumber.from(ensure0x(r.toString('hex'))),
+    BigNumber.from(1),
+    BigNumber.from(ensure0x(MAX_ECDSA_VAL)),
+    'r'
+  );
+  assertInRange(
+    BigNumber.from(ensure0x(s.toString('hex'))),
+    BigNumber.from(1),
+    BigNumber.from(ensure0x(EC_ORDER)),
+    's'
+  );
+  assertInRange(
+    BigNumber.from(ensure0x(w.toString('hex'))),
+    BigNumber.from(1),
+    BigNumber.from(ensure0x(MAX_ECDSA_VAL)),
+    'w'
+  );
+  return msgSignature;
+}
+
+/*
+   Verifies a message using the provided key.
+   key should be an KeyPair with a valid public key.
+   msgSignature should be an Signature.
+   Returns a boolean true if the verification succeeds.
+  */
+export function verify(keyPair: EC.KeyPair, msgHash: string, sig: EC.Signature): boolean {
+  const msgHashBN = BigNumber.from(ensure0x(msgHash));
+  assertInRange(msgHashBN, BigNumber.from(0), BigNumber.from(ensure0x(MAX_ECDSA_VAL)), 'msgHash');
+  const { r, s } = sig;
+  const w = s.invm(ec.n!);
+  // Verify signature has valid length.
+  assertInRange(
+    BigNumber.from(r.toString()),
+    BigNumber.from(1),
+    BigNumber.from(ensure0x(MAX_ECDSA_VAL)),
+    'r'
+  );
+  assertInRange(
+    BigNumber.from(s.toString()),
+    BigNumber.from(1),
+    BigNumber.from(ensure0x(EC_ORDER)),
+    's'
+  );
+  assertInRange(
+    BigNumber.from(w.toString()),
+    BigNumber.from(1),
+    BigNumber.from(ensure0x(MAX_ECDSA_VAL)),
+    'w'
+  );
+
+  return keyPair.verify(msgHash, sig);
+}
diff --git a/src/index.ts b/src/index.ts
index 237da8bf9..748fce33b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,5 @@
 export * from './utils';
 export * from './types';
 export * from './contract';
+export * from './wallet';
 export * from './starknet';
diff --git a/src/math.ts b/src/math.ts
new file mode 100644
index 000000000..261ae18f0
--- /dev/null
+++ b/src/math.ts
@@ -0,0 +1,84 @@
+import { BigNumber, parseFixed } from '@ethersproject/bignumber';
+import assert from 'assert';
+
+type ECPoint = [BigNumber, BigNumber];
+
+export const EC_ORDER = BigNumber.from(
+  '3618502788666131213697322783095070105526743751716087489154079457884512865583'
+);
+export const ALPHA = BigNumber.from(1);
+export const FIELD_PRIME = BigNumber.from(
+  '3618502788666131213697322783095070105623107215331596699973092056135872020481'
+);
+export const EC_GEN: ECPoint = [
+  BigNumber.from('0x1EF15C18599971B7BECED415A40F0C7DEACFD9B0D1819E03D723D8BC943CFCA'.toLowerCase()),
+  BigNumber.from('0x5668060AA49730B7BE4801DF46EC62DE53ECD11ABE43A32873000C36E8DC1F'.toLowerCase()),
+];
+
+const floorDiv = (a: BigNumber, b: BigNumber): BigNumber => {
+  return parseFixed(a.div(b).toString(), 0);
+};
+
+export const igcdex = (a: BigNumber, b: BigNumber): [BigNumber, BigNumber, BigNumber] => {
+  if (a.eq(0) && b.eq(0)) return [BigNumber.from(0), BigNumber.from(1), BigNumber.from(0)];
+  if (a.eq(0)) return [BigNumber.from(0), floorDiv(b, b.abs()), b.abs()];
+  if (b.eq(0)) return [floorDiv(a, a.abs()), BigNumber.from(0), a.abs()];
+
+  let mutA = a.abs();
+  const xSign = a.lt(0) ? BigNumber.from(-1) : BigNumber.from(1);
+
+  let mutB = b.abs();
+  const ySign = b.lt(0) ? BigNumber.from(-1) : BigNumber.from(1);
+
+  let [x, y, r, s] = [BigNumber.from(1), BigNumber.from(0), BigNumber.from(0), BigNumber.from(1)];
+  while (!mutB.eq(0)) {
+    const [c, q] = [mutA.mod(mutB), floorDiv(mutA, mutB)];
+    [mutA, mutB, r, s, x, y] = [mutB, c, x.sub(q.mul(r)), y.sub(q.mul(s)), r, s];
+  }
+
+  return [x.mul(xSign), y.mul(ySign), mutA];
+};
+
+export const divMod = (n: BigNumber, m: BigNumber, p: BigNumber): BigNumber => {
+  const [a, , c] = igcdex(m, p);
+  assert(c.toHexString() === BigNumber.from(1).toHexString());
+  return n.mul(a).mod(p);
+};
+
+export const ecAdd = (point1: ECPoint, point2: ECPoint, p: BigNumber): ECPoint => {
+  assert(!point1[0].sub(point2[0]).mod(p).eq(0));
+  const m = divMod(point1[1].sub(point2[1]), point1[0].sub(point2[0]), p);
+  const x = m.mul(m).sub(point1[0]).sub(point2[0]).mod(p);
+  const y = m.mul(point1[0].sub(x)).sub(point1[1]).mod(p);
+  return [x, y];
+};
+
+export const ecDouble = (point: ECPoint, alpha: BigNumber, p: BigNumber): ECPoint => {
+  assert(!point[1].mod(p).eq(0));
+  const m = divMod(
+    BigNumber.from(3).mul(point[0]).mul(point[0]).add(alpha),
+    BigNumber.from(2).mul(point[1]),
+    p
+  );
+  const x = m.mul(m).sub(point[0].mul(2)).mod(p);
+  const y = m.mul(point[0].sub(x)).sub(point[1]).mod(p);
+
+  return [x, y];
+};
+
+export const ecMult = (m: BigNumber, point: ECPoint, alpha: BigNumber, p: BigNumber): ECPoint => {
+  if (m.eq(1)) return point;
+  if (m.mod(2).eq(0))
+    return ecMult(floorDiv(m, BigNumber.from(2)), ecDouble(point, alpha, p), alpha, p);
+  return ecAdd(ecMult(m.sub(1), point, alpha, p), point, p);
+};
+
+export const privateKeyToEcPointOnStarkCurve = (pk: BigNumber): ECPoint => {
+  assert(pk.gt(0) && pk.lt(EC_ORDER));
+  return ecMult(pk, EC_GEN, ALPHA, FIELD_PRIME);
+};
+
+export const privateToStarkKey = (pk: string): string => {
+  const pkBn = BigNumber.from(pk);
+  return privateKeyToEcPointOnStarkCurve(pkBn)[0].toHexString();
+};
diff --git a/src/utils.ts b/src/utils.ts
index 2e12b93af..43434b85a 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -2,12 +2,16 @@ import { gzip } from 'pako';
 import Json from 'json-bigint';
 import { keccak256 } from 'ethereum-cryptography/keccak';
 import { BigNumber } from '@ethersproject/bignumber';
+import { hexToBinary, binaryToNumber } from 'enc-utils';
 import { CompressedProgram, Program } from './types';
 import { CONTRACT_ADDRESS_LOWER_BOUND, CONTRACT_ADDRESS_UPPER_BOUND } from './constants';
 
 export const isBrowser = typeof window !== 'undefined';
 const MASK_250 = BigNumber.from(2).pow(250).sub(1); // 2 ** 250 - 1
 
+export const ensureNo0x = (str: string) => str.replace(/^0x/, '');
+export const ensure0x = (str: string) => `0x${ensureNo0x(str)}`;
+
 export const hexToDecimalString = (hex: string): string =>
   BigNumber.from(`0x${hex.replace(/^0x/, '')}`).toString();
 
@@ -82,3 +86,16 @@ export function getSelectorFromName(funcName: string) {
   // sometimes BigInteger pads the hex string with zeros, which isnt allowed in the starknet api
   return starknetKeccak(funcName).toHexString();
 }
+
+/*
+ Returns an integer from a given section of bits out of a hex string.
+ hex is the target hex string to slice.
+ start represents the index of the first bit to cut from the hex string (binary) in LSB order.
+ end represents the index of the last bit to cut from the hex string.
+*/
+export function getIntFromBits(hex: string, start: number, end?: number) {
+  const bin = hexToBinary(hex);
+  const bits = bin.slice(start, end);
+  const i = binaryToNumber(bits);
+  return i;
+}
diff --git a/src/wallet.ts b/src/wallet.ts
new file mode 100644
index 000000000..57065330b
--- /dev/null
+++ b/src/wallet.ts
@@ -0,0 +1,30 @@
+import { pedersen } from './ec';
+
+export * from './ec';
+
+export const hashCalldata = (calldata: string[]): string => {
+  const calldataCopy = [...calldata];
+  if (calldataCopy.length === 0) {
+    return '0';
+  }
+  if (calldataCopy.length === 1) {
+    return calldataCopy[0];
+  }
+  // calldata element will always be there as it was checked by an if statement before (!)
+  const calldataEl = calldataCopy.shift()!;
+  return pedersen([hashCalldata(calldataCopy), calldataEl]);
+};
+
+export const hashMessage = (
+  account: string,
+  to: string,
+  selector: string,
+  calldata: string[],
+  nonce: string
+) => {
+  const hash0 = pedersen([account, to]);
+  const hash1 = pedersen([hash0, selector]);
+  const calldataHash = hashCalldata(calldata);
+  const hash2 = pedersen([hash1, calldataHash]);
+  return pedersen([hash2, nonce]);
+};