diff --git a/common/typescript/bn.d.ts b/common/typescript/bn.d.ts
new file mode 100644
index 00000000..d4e4844f
--- /dev/null
+++ b/common/typescript/bn.d.ts
@@ -0,0 +1,540 @@
+declare module 'bn.js' {
+  import { Buffer } from 'buffer';
+
+  type Endianness = 'le' | 'be';
+  type IPrimeName = 'k256' | 'p224' | 'p192' | 'p25519';
+  class RedBN {
+    redAdd(b: RedBN): RedBN;
+    redIAdd(b: RedBN): RedBN;
+    redSub(b: RedBN): RedBN;
+    redISub(b: RedBN): RedBN;
+    redShl(num: number): RedBN;
+    redMul(b: RedBN): RedBN;
+    redIMul(b: RedBN): RedBN;
+    redSqr(): RedBN;
+    redISqr(): RedBN;
+    /**
+       * @description square root modulo reduction context's prime
+       */
+    redSqrt(): RedBN;
+    /**
+       * @description  modular inverse of the number
+       */
+    redInvm(): RedBN;
+    redNeg(): RedBN;
+    /**
+       * @description modular exponentiation
+       */
+    redPow(b: RedBN): RedBN;
+    fromRed(): BN;
+  }
+
+  // FIXME: not sure how to specify the reduction context here
+  interface IReductionContext {
+    m: number;
+    prime: object;
+    [key: string]: any;
+  }
+
+  export default class BN {
+    constructor(
+      number: number | string | number[] | Buffer | BN,
+      base?: number,
+      endian?: Endianness
+    );
+    /**
+     * @description  create a reduction context
+     */
+
+    static red(reductionContext: BN | IPrimeName): IReductionContext;
+    /**
+     * @description  create a reduction context  with the Montgomery trick.
+     */
+
+    static mont(num: BN): IReductionContext;
+    /**
+     * @description  Convert number to red
+     */
+
+    /**
+     * @description returns true if the supplied object is a BN.js instance
+     */
+
+    static isBN(b: object): boolean;
+
+    toRed(reductionContext: IReductionContext): RedBN;
+    /**
+     * @description  clone number
+     */
+
+    clone(): BN;
+
+    /**
+     * @description  convert to base-string and pad with zeroes
+     */
+
+    toString(base?: number, length?: number): string;
+
+    /**
+     * @description convert to Javascript Number (limited to 53 bits)
+     */
+
+    toNumber(): number;
+
+    /**
+     * @description convert to JSON compatible hex string (alias of toString(16))
+     */
+
+    toJSON(): string;
+
+    /**
+     * @description  convert to byte Array, and optionally zero pad to length, throwing if already exceeding
+     */
+
+    toArray(endian?: Endianness, length?: number): number[];
+
+    /**
+     * @description convert to an instance of `type`, which must behave like an Array
+     */
+    toArrayLike(
+      ArrayType: Buffer | Array<any>,
+      endian?: Endianness,
+      length?: number
+    ): Buffer | Array<any>;
+
+    /**
+     * @description  convert to Node.js Buffer (if available). For compatibility with browserify and similar tools, use this instead: a.toArrayLike(Buffer, endian, length)
+     */
+    toBuffer(endian?: Endianness, length?: number): Buffer;
+
+    /**
+     * @description get number of bits occupied
+     */
+
+    bitLength(): number;
+
+    /**
+     * @description return number of less-significant consequent zero bits (example: 1010000 has 4 zero bits)
+     */
+
+    zeroBits(): number;
+
+    /**
+     * @description return number of bytes occupied
+     */
+
+    byteLength(): number;
+
+    /**
+     * @description  true if the number is negative
+     */
+
+    isNeg(): boolean;
+
+    /**
+     * @description  no comments
+     */
+
+    isEven(): boolean;
+
+    /**
+     * @description   no comments
+     */
+
+    isOdd(): boolean;
+
+    /**
+     * @description   no comments
+     */
+
+    isZero(): boolean;
+
+    /**
+     * @description compare numbers and return `-1 (a < b)`, `0 (a == b)`, or `1 (a > b)` depending on the comparison result 
+     */
+
+    cmp(b: BN): -1 | 0 | 1;
+
+    /**
+     * @description compare numbers and return `-1 (a < b)`, `0 (a == b)`, or `1 (a > b)` depending on the comparison result 
+     */
+
+    ucmp(b: BN): -1 | 0 | 1;
+
+    /**
+     * @description compare numbers and return `-1 (a < b)`, `0 (a == b)`, or `1 (a > b)` depending on the comparison result 
+     */
+
+    cmpn(b: number): -1 | 0 | 1;
+
+    /**
+     * @description a less than b 
+     */
+
+    lt(b: BN): boolean;
+
+    /**
+     * @description a less than b 
+     */
+
+    ltn(b: number): boolean;
+
+    /**
+     * @description a less than or equals b 
+     */
+
+    lte(b: BN): boolean;
+
+    /**
+     * @description a less than or equals b 
+     */
+
+    lten(b: number): boolean;
+
+    /**
+     * @description a greater than b
+     */
+
+    gt(b: BN): boolean;
+
+    /**
+     * @description a greater than b
+     */
+
+    gtn(b: number): boolean;
+
+    /**
+     * @description a greater than or equals b
+     */
+
+    gte(b: BN): boolean;
+
+    /**
+     * @description a greater than or equals b
+     */
+
+    gten(b: number): boolean;
+
+    /**
+     * @description a equals b
+     */
+
+    eq(b: BN): boolean;
+
+    /**
+     * @description a equals b
+     */
+
+    eqn(b: number): boolean;
+
+    /**
+     * @description convert to two's complement representation, where width is bit width
+     */
+
+    toTwos(width: number): BN;
+
+    /**
+     * @description  convert from two's complement representation, where width is the bit width
+     */
+
+    fromTwos(width: number): BN;
+
+    /**
+     * @description negate sign
+     */
+
+    neg(): BN;
+
+    /**
+     * @description negate sign
+     */
+
+    ineg(): BN;
+
+    /**
+     * @description absolute value
+     */
+
+    abs(): BN;
+
+    /**
+     * @description absolute value
+     */
+
+    iabs(): BN;
+
+    /**
+     * @description addition
+     */
+
+    add(b: BN): BN;
+    /**
+     * @description  addition
+     */
+
+    iadd(b: BN): BN;
+    addition;
+    /**
+     * @description addition
+     */
+
+    addn(b: number): BN;
+    /**
+     * @description addition
+     */
+
+    iaddn(b: number): BN;
+
+    /**
+     * @description subtraction
+     */
+
+    sub(b: BN): BN;
+    /**
+     * @description subtraction
+     */
+
+    isub(b: BN): BN;
+    /**
+     * @description subtraction
+     */
+
+    subn(b: number): BN;
+    /**
+     * @description subtraction
+     */
+
+    isubn(b: number): BN;
+
+    /**
+     * @description multiply
+     */
+
+    mul(b: BN): BN;
+    /**
+     * @description multiply
+     */
+
+    imul(b: BN): BN;
+    /**
+     * @description multiply
+     */
+
+    muln(b: number): BN;
+    /**
+     * @description multiply
+     */
+
+    imuln(b: number): BN;
+
+    /**
+     * @description square
+     */
+    sqr(): BN;
+    /**
+     * @description square
+     */
+    isqr(): BN;
+
+    /**
+     * @description raise `a` to the power of `b`
+     */
+
+    pow(b: BN): BN;
+
+    /**
+     * @description divide
+     */
+    div(b: BN): BN;
+    /**
+     * @description divide
+     */
+    divn(b: number): BN;
+    /**
+     * @description divide
+     */
+    idivn(b: number): BN;
+
+    /**
+     * @description reduct
+     */
+
+    mod(b: BN): BN;
+    /**
+     * @description reduct
+     */
+
+    umod(b: BN): BN;
+    /**
+     * @description reduct
+     */
+
+    modn(b: number): BN;
+
+    /**
+     * @description  rounded division
+     */
+
+    divRound(b: BN): BN;
+
+    /**
+     * @description or
+     */
+
+    or(b: BN): BN;
+    /**
+     * @description or
+     */
+
+    ior(b: BN): BN;
+    /**
+     * @description or
+     */
+
+    uor(b: BN): BN;
+    /**
+     * @description or
+     */
+
+    iuor(b: BN): BN;
+
+    /**
+     * @description and
+     */
+
+    and(b: BN): BN;
+    /**
+     * @description and
+     */
+
+    iand(b: BN): BN;
+    /**
+     * @description and
+     */
+
+    uand(b: BN): BN;
+    /**
+     * @description and
+     */
+
+    iuand(b: BN): BN;
+    /**
+     * @description and (NOTE: `andln` is going to be replaced with `andn` in future)
+     */
+
+    andln(b: number): BN;
+    /**
+     * @description xor
+     */
+
+    xor(b: BN): BN;
+
+    /**
+     * @description xor
+     */
+
+    ixor(b: BN): BN;
+    /**
+     * @description xor
+     */
+
+    uxor(b: BN): BN;
+    /**
+     * @description xor
+     */
+
+    iuxor(b: BN): BN;
+    /**
+     * @description set specified bit to 1
+     */
+
+    setn(b: number): BN;
+    /**
+     * @description shift left
+     */
+
+    shln(b: number): BN;
+    /**
+     * @description shift left
+     */
+
+    ishln(b: number): BN;
+    /**
+     * @description shift left
+     */
+
+    ushln(b: number): BN;
+    /**
+     * @description shift left
+     */
+
+    iushln(b: number): BN;
+    /**
+     * @description shift right
+     */
+
+    shrn(b: number): BN;
+
+    /**
+     * @description shift right
+     */
+
+    ishrn(b: number): BN;
+    /**
+     * @description shift right
+     */
+
+    ushrn(b: number): BN;
+    /**
+     * @description shift right
+     */
+
+    iushrn(b: number): BN;
+    /**
+     * @description  test if specified bit is set
+     */
+
+    testn(b: number): boolean;
+    /**
+     * @description clear bits with indexes higher or equal to `b`
+     */
+
+    maskn(b: number): BN;
+    /**
+     * @description clear bits with indexes higher or equal to `b`
+     */
+
+    imaskn(b: number): BN;
+    /**
+     * @description add `1 << b` to the number
+     */
+
+    bincn(b: number): BN;
+    /**
+     * @description not (for the width specified by `w`) 
+     */
+
+    notn(w: number): BN;
+    /**
+     * @description not (for the width specified by `w`) 
+     */
+
+    inotn(w: number): BN;
+
+    /**
+     * @description GCD
+     */
+
+    gcd(b: BN): BN;
+    /**
+     * @description Extended GCD results `({ a: ..., b: ..., gcd: ... })`
+     */
+
+    egcd(b: BN): { a: BN; b: BN; gcd: BN };
+    /**
+     * @description inverse `a` modulo `b`
+     */
+
+    invm(b: BN): BN;
+  }
+}
diff --git a/common/typescript/ethereumjs-tx.d.ts b/common/typescript/ethereumjs-tx.d.ts
index 33786e99..6c72b731 100644
--- a/common/typescript/ethereumjs-tx.d.ts
+++ b/common/typescript/ethereumjs-tx.d.ts
@@ -1,6 +1,5 @@
 declare module 'ethereumjs-tx' {
-  import { BigNumber } from 'bignumber.js';
-  import BN = require('bn.js');
+  import BN from 'bn.js';
   import { Buffer } from 'buffer';
 
   /*
diff --git a/common/typescript/ethereumjs-util.d.ts b/common/typescript/ethereumjs-util.d.ts
index 3e5d812f..14c8d39d 100644
--- a/common/typescript/ethereumjs-util.d.ts
+++ b/common/typescript/ethereumjs-util.d.ts
@@ -1,6 +1,6 @@
 declare module 'ethereumjs-util' {
   import { Buffer } from 'buffer';
-  import BN = require('bn.js');
+  import BN from 'bn.js';
   export import rlp = require('rlp');
 
   interface Signature {
diff --git a/common/vendors.js b/common/vendors.js
index 341697fa..d5a88c80 100644
--- a/common/vendors.js
+++ b/common/vendors.js
@@ -22,5 +22,5 @@ require('moment');
 require('prop-types');
 require('qrcode');
 require('qrcode.react');
-require('bignumber.js');
+require('bn.js');
 require('classnames');
diff --git a/package-lock.json b/package-lock.json
index c8769c0a..1fffae38 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2350,7 +2350,6 @@
       "requires": {
         "anymatch": "1.3.2",
         "async-each": "1.0.1",
-        "fsevents": "1.1.2",
         "glob-parent": "2.0.0",
         "inherits": "2.0.3",
         "is-binary-path": "1.0.1",
@@ -4653,905 +4652,6 @@
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
       "dev": true
     },
-    "fsevents": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.2.tgz",
-      "integrity": "sha512-Sn44E5wQW4bTHXvQmvSHwqbuiXtduD6Rrjm2ZtUEGbyrig+nUH3t/QD4M4/ZXViY556TBpRgZkHLDx3JxPwxiw==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "nan": "2.6.2",
-        "node-pre-gyp": "0.6.36"
-      },
-      "dependencies": {
-        "abbrev": {
-          "version": "1.1.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "ajv": {
-          "version": "4.11.8",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "co": "4.6.0",
-            "json-stable-stringify": "1.0.1"
-          }
-        },
-        "ansi-regex": {
-          "version": "2.1.1",
-          "bundled": true,
-          "dev": true
-        },
-        "aproba": {
-          "version": "1.1.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "are-we-there-yet": {
-          "version": "1.1.4",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "delegates": "1.0.0",
-            "readable-stream": "2.2.9"
-          }
-        },
-        "asn1": {
-          "version": "0.2.3",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "assert-plus": {
-          "version": "0.2.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "asynckit": {
-          "version": "0.4.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "aws-sign2": {
-          "version": "0.6.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "aws4": {
-          "version": "1.6.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "balanced-match": {
-          "version": "0.4.2",
-          "bundled": true,
-          "dev": true
-        },
-        "bcrypt-pbkdf": {
-          "version": "1.0.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "tweetnacl": "0.14.5"
-          }
-        },
-        "block-stream": {
-          "version": "0.0.9",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "inherits": "2.0.3"
-          }
-        },
-        "boom": {
-          "version": "2.10.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "hoek": "2.16.3"
-          }
-        },
-        "brace-expansion": {
-          "version": "1.1.7",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "balanced-match": "0.4.2",
-            "concat-map": "0.0.1"
-          }
-        },
-        "buffer-shims": {
-          "version": "1.0.0",
-          "bundled": true,
-          "dev": true
-        },
-        "caseless": {
-          "version": "0.12.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "co": {
-          "version": "4.6.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "code-point-at": {
-          "version": "1.1.0",
-          "bundled": true,
-          "dev": true
-        },
-        "combined-stream": {
-          "version": "1.0.5",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "delayed-stream": "1.0.0"
-          }
-        },
-        "concat-map": {
-          "version": "0.0.1",
-          "bundled": true,
-          "dev": true
-        },
-        "console-control-strings": {
-          "version": "1.1.0",
-          "bundled": true,
-          "dev": true
-        },
-        "core-util-is": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        },
-        "cryptiles": {
-          "version": "2.0.5",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "boom": "2.10.1"
-          }
-        },
-        "dashdash": {
-          "version": "1.14.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "assert-plus": "1.0.0"
-          },
-          "dependencies": {
-            "assert-plus": {
-              "version": "1.0.0",
-              "bundled": true,
-              "dev": true,
-              "optional": true
-            }
-          }
-        },
-        "debug": {
-          "version": "2.6.8",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "ms": "2.0.0"
-          }
-        },
-        "deep-extend": {
-          "version": "0.4.2",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "delayed-stream": {
-          "version": "1.0.0",
-          "bundled": true,
-          "dev": true
-        },
-        "delegates": {
-          "version": "1.0.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "ecc-jsbn": {
-          "version": "0.1.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "jsbn": "0.1.1"
-          }
-        },
-        "extend": {
-          "version": "3.0.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "extsprintf": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        },
-        "forever-agent": {
-          "version": "0.6.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "form-data": {
-          "version": "2.1.4",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "asynckit": "0.4.0",
-            "combined-stream": "1.0.5",
-            "mime-types": "2.1.15"
-          }
-        },
-        "fs.realpath": {
-          "version": "1.0.0",
-          "bundled": true,
-          "dev": true
-        },
-        "fstream": {
-          "version": "1.0.11",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "graceful-fs": "4.1.11",
-            "inherits": "2.0.3",
-            "mkdirp": "0.5.1",
-            "rimraf": "2.6.1"
-          }
-        },
-        "fstream-ignore": {
-          "version": "1.0.5",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "fstream": "1.0.11",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4"
-          }
-        },
-        "gauge": {
-          "version": "2.7.4",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "aproba": "1.1.1",
-            "console-control-strings": "1.1.0",
-            "has-unicode": "2.0.1",
-            "object-assign": "4.1.1",
-            "signal-exit": "3.0.2",
-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1",
-            "wide-align": "1.1.2"
-          }
-        },
-        "getpass": {
-          "version": "0.1.7",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "assert-plus": "1.0.0"
-          },
-          "dependencies": {
-            "assert-plus": {
-              "version": "1.0.0",
-              "bundled": true,
-              "dev": true,
-              "optional": true
-            }
-          }
-        },
-        "glob": {
-          "version": "7.1.2",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "fs.realpath": "1.0.0",
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-            "readable-stream": "2.2.9",
-            "rimraf": "2.6.1",
-            "tar": "2.2.1",
-            "uid-number": "0.0.6"
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-        "tunnel-agent": {
-          "version": "0.6.0",
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-          "dev": true,
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-          "requires": {
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-        "tweetnacl": {
-          "version": "0.14.5",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "uid-number": {
-          "version": "0.0.6",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "util-deprecate": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        },
-        "uuid": {
-          "version": "3.0.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "verror": {
-          "version": "1.3.6",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "extsprintf": "1.0.2"
-          }
-        },
-        "wide-align": {
-          "version": "1.1.2",
-          "bundled": true,
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "string-width": "1.0.2"
-          }
-        },
-        "wrappy": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        }
-      }
-    },
     "fstream": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
@@ -13556,23 +12656,6 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
-    "types-bn": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/types-bn/-/types-bn-0.0.1.tgz",
-      "integrity": "sha512-Kqx+ic862yy/dqXex5M6ZFEf3w1Hwx2yynygY7zhnWw3n58jImSwUlN0JoaWyuCFWfbf12X+7/qiURXYSKv6GA==",
-      "dev": true,
-      "requires": {
-        "bn.js": "4.11.7"
-      },
-      "dependencies": {
-        "bn.js": {
-          "version": "4.11.7",
-          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.7.tgz",
-          "integrity": "sha512-LxFiV5mefv0ley0SzqkOPR1bC4EbpPx8LkOz5vMe/Yi15t5hzwgO/G+tc7wOtL4PZTYjwHu8JnEiSLumuSjSfA==",
-          "dev": true
-        }
-      }
-    },
     "types-rlp": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/types-rlp/-/types-rlp-0.0.1.tgz",
diff --git a/package.json b/package.json
index 8ed06f9b..fe821dee 100644
--- a/package.json
+++ b/package.json
@@ -105,7 +105,6 @@
     "tslint": "^5.7.0",
     "tslint-config-prettier": "^1.5.0",
     "tslint-react": "^3.2.0",
-    "types-bn": "0.0.1",
     "types-rlp": "0.0.1",
     "typescript": "^2.5.2",
     "url-loader": "^0.5.8",
diff --git a/tsconfig.json b/tsconfig.json
index 1a2d9c66..777bd9b5 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -15,12 +15,7 @@
     "noUnusedLocals": true,
     "noUnusedParameters": true
   },
-  "include": [
-    "./common/",
-    "spec",
-    "./node_modules/types-rlp/index.d.ts",
-    "./node_modules/types-bn/index.d.ts"
-  ],
+  "include": ["./common/", "spec", "./node_modules/types-rlp/index.d.ts"],
   "awesomeTypescriptLoaderOptions": {
     "transpileOnly": true
   }