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--- a/node_modules/bip66/LICENSE
+++ b/node_modules/bip66/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Daniel Cousens
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/node_modules/bip66/README.md
+++ b/node_modules/bip66/README.md
@@ -0,0 +1,40 @@
+# bip66
+
+[![NPM Package](https://img.shields.io/npm/v/bip66.svg?style=flat-square)](https://www.npmjs.org/package/bip66)
+[![Build Status](https://img.shields.io/travis/bitcoinjs/bip66.svg?branch=master&style=flat-square)](https://travis-ci.org/bitcoinjs/bip66)
+
+[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
+
+Strict DER signature encoding/decoding.
+
+See [bip66](https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki).
+
+- This module **works only with [two's complement](https://en.wikipedia.org/wiki/Two's_complement) numbers**.
+- BIP66 doesn't check that `r` or `s` are fully valid.
+  - `check`/`decode` doesn't check that `r` or `s` great than 33 bytes or that this number represent valid point on elliptic curve.
+  - `encode` doesn't check that `r`/`s` represent valid point on elliptic curve.
+
+## Example
+
+``` javascript
+var bip66 = require('bip66')
+var r = new Buffer('1ea1fdff81b3a271659df4aad19bc4ef83def389131a36358fe64b245632e777', 'hex')
+var s = new Buffer('29e164658be9ce810921bf81d6b86694785a79ea1e52dbfa5105148d1f0bc1', 'hex')
+
+bip66.encode(r, s)
+// Buffer <30 43 02 20 1e a1 fd ff 81 b3 a2 71 65 9d f4 aa d1 9b c4 ef 83 de f3 89 13 1a 36 35 8f e6 4b 24 56 32 e7 77 02 1f 29 e1 64 65 8b e9 ce 81 09 21 bf 81 d6 b8 66 94 78 5a 79 ea 1e 52 db fa 51 05 14 8d 1f 0b c1>
+
+var signature = new Buffer('304302201ea1fdff81b3a271659df4aad19bc4ef83def389131a36358fe64b245632e777021f29e164658be9ce810921bf81d6b86694785a79ea1e52dbfa5105148d1f0bc1', 'hex')
+bip66.decode(signature)
+// => {
+//	r: Buffer <1e a1 fd ff 81 b3 a2 71 65 9d f4 aa d1 9b c4 ef 83 de f3 89 13 1a 36 35 8f e6 4b 24 56 32 e7 77>,
+//	s: Buffer <29 e1 64 65 8b e9 ce 81 09 21 bf 81 d6 b8 66 94 78 5a 79 ea 1e 52 db fa 51 05 14 8d 1f 0b c1>
+// }
+```
+
+A catch-all exception regex:
+``` javascript
+/Expected DER (integer|sequence)|(R|S) value (excessively padded|is negative)|(R|S|DER sequence) length is (zero|too short|too long|invalid)/
+```
+
+## LICENSE [MIT](LICENSE)
--- a/node_modules/bip66/index.js
+++ b/node_modules/bip66/index.js
@@ -0,0 +1,113 @@
+// Reference https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki
+// Format: 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]
+// NOTE: SIGHASH byte ignored AND restricted, truncate before use
+
+var Buffer = require('safe-buffer').Buffer
+
+function check (buffer) {
+  if (buffer.length < 8) return false
+  if (buffer.length > 72) return false
+  if (buffer[0] !== 0x30) return false
+  if (buffer[1] !== buffer.length - 2) return false
+  if (buffer[2] !== 0x02) return false
+
+  var lenR = buffer[3]
+  if (lenR === 0) return false
+  if (5 + lenR >= buffer.length) return false
+  if (buffer[4 + lenR] !== 0x02) return false
+
+  var lenS = buffer[5 + lenR]
+  if (lenS === 0) return false
+  if ((6 + lenR + lenS) !== buffer.length) return false
+
+  if (buffer[4] & 0x80) return false
+  if (lenR > 1 && (buffer[4] === 0x00) && !(buffer[5] & 0x80)) return false
+
+  if (buffer[lenR + 6] & 0x80) return false
+  if (lenS > 1 && (buffer[lenR + 6] === 0x00) && !(buffer[lenR + 7] & 0x80)) return false
+  return true
+}
+
+function decode (buffer) {
+  if (buffer.length < 8) throw new Error('DER sequence length is too short')
+  if (buffer.length > 72) throw new Error('DER sequence length is too long')
+  if (buffer[0] !== 0x30) throw new Error('Expected DER sequence')
+  if (buffer[1] !== buffer.length - 2) throw new Error('DER sequence length is invalid')
+  if (buffer[2] !== 0x02) throw new Error('Expected DER integer')
+
+  var lenR = buffer[3]
+  if (lenR === 0) throw new Error('R length is zero')
+  if (5 + lenR >= buffer.length) throw new Error('R length is too long')
+  if (buffer[4 + lenR] !== 0x02) throw new Error('Expected DER integer (2)')
+
+  var lenS = buffer[5 + lenR]
+  if (lenS === 0) throw new Error('S length is zero')
+  if ((6 + lenR + lenS) !== buffer.length) throw new Error('S length is invalid')
+
+  if (buffer[4] & 0x80) throw new Error('R value is negative')
+  if (lenR > 1 && (buffer[4] === 0x00) && !(buffer[5] & 0x80)) throw new Error('R value excessively padded')
+
+  if (buffer[lenR + 6] & 0x80) throw new Error('S value is negative')
+  if (lenS > 1 && (buffer[lenR + 6] === 0x00) && !(buffer[lenR + 7] & 0x80)) throw new Error('S value excessively padded')
+
+  // non-BIP66 - extract R, S values
+  return {
+    r: buffer.slice(4, 4 + lenR),
+    s: buffer.slice(6 + lenR)
+  }
+}
+
+/*
+ * Expects r and s to be positive DER integers.
+ *
+ * The DER format uses the most significant bit as a sign bit (& 0x80).
+ * If the significant bit is set AND the integer is positive, a 0x00 is prepended.
+ *
+ * Examples:
+ *
+ *      0 =>     0x00
+ *      1 =>     0x01
+ *     -1 =>     0xff
+ *    127 =>     0x7f
+ *   -127 =>     0x81
+ *    128 =>   0x0080
+ *   -128 =>     0x80
+ *    255 =>   0x00ff
+ *   -255 =>   0xff01
+ *  16300 =>   0x3fac
+ * -16300 =>   0xc054
+ *  62300 => 0x00f35c
+ * -62300 => 0xff0ca4
+*/
+function encode (r, s) {
+  var lenR = r.length
+  var lenS = s.length
+  if (lenR === 0) throw new Error('R length is zero')
+  if (lenS === 0) throw new Error('S length is zero')
+  if (lenR > 33) throw new Error('R length is too long')
+  if (lenS > 33) throw new Error('S length is too long')
+  if (r[0] & 0x80) throw new Error('R value is negative')
+  if (s[0] & 0x80) throw new Error('S value is negative')
+  if (lenR > 1 && (r[0] === 0x00) && !(r[1] & 0x80)) throw new Error('R value excessively padded')
+  if (lenS > 1 && (s[0] === 0x00) && !(s[1] & 0x80)) throw new Error('S value excessively padded')
+
+  var signature = Buffer.allocUnsafe(6 + lenR + lenS)
+
+  // 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]
+  signature[0] = 0x30
+  signature[1] = signature.length - 2
+  signature[2] = 0x02
+  signature[3] = r.length
+  r.copy(signature, 4)
+  signature[4 + lenR] = 0x02
+  signature[5 + lenR] = s.length
+  s.copy(signature, 6 + lenR)
+
+  return signature
+}
+
+module.exports = {
+  check: check,
+  decode: decode,
+  encode: encode
+}
--- a/node_modules/bip66/package.json
+++ b/node_modules/bip66/package.json
@@ -0,0 +1,64 @@
+{
+  "_from": "bip66@^1.1.3",
+  "_id": "bip66@1.1.5",
+  "_inBundle": false,
+  "_integrity": "sha1-AfqHSHhcpwlV1QESF9GzE5lpyiI=",
+  "_location": "/bip66",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "range",
+    "registry": true,
+    "raw": "bip66@^1.1.3",
+    "name": "bip66",
+    "escapedName": "bip66",
+    "rawSpec": "^1.1.3",
+    "saveSpec": null,
+    "fetchSpec": "^1.1.3"
+  },
+  "_requiredBy": [
+    "/secp256k1"
+  ],
+  "_resolved": "https://registry.npmjs.org/bip66/-/bip66-1.1.5.tgz",
+  "_shasum": "01fa8748785ca70955d5011217d1b3139969ca22",
+  "_spec": "bip66@^1.1.3",
+  "_where": "/filestore/dev/avanity/node_modules/secp256k1",
+  "author": {
+    "name": "Daniel Cousens"
+  },
+  "bugs": {
+    "url": "https://github.com/bitcoinjs/bip66/issues"
+  },
+  "bundleDependencies": false,
+  "dependencies": {
+    "safe-buffer": "^5.0.1"
+  },
+  "deprecated": false,
+  "description": "Strict DER signature encoding/decoding.",
+  "devDependencies": {
+    "nyc": "^6.4.0",
+    "standard": "^10.0.2",
+    "tape": "^4.5.1"
+  },
+  "files": [
+    "index.js"
+  ],
+  "homepage": "https://github.com/bitcoinjs/bip66",
+  "keywords": [
+    "bip66",
+    "bitcoin"
+  ],
+  "license": "MIT",
+  "main": "index.js",
+  "name": "bip66",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/bitcoinjs/bip66.git"
+  },
+  "scripts": {
+    "coverage": "nyc --check-coverage --branches 100 --functions 100 tape test/*.js",
+    "lint": "standard",
+    "test": "npm run lint && npm run unit",
+    "unit": "tape test/*.js"
+  },
+  "version": "1.1.5"
+}