diff --git a/config/config.json.sample b/config/config.json.sample
deleted file mode 100644
index eb6b5e6..0000000
--- a/config/config.json.sample
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "LINKDROP_MASTER_ADDRESS": "",
-  "SIGNING_KEY": "",
-  "FACTORY_ADDRESS": "0xBa051891B752ecE3670671812486fe8dd34CC1c8",
-  "CAMPAIGN_ID": "1",
-  "LINKS_NUMBER": "100",
-  "WEI_AMOUNT": "10",
-  "TOKEN_ADDRESS": "0x0000000000000000000000000000000000000000",
-  "TOKENS_AMOUNT": "0",
-  "EXPIRATION_TIME": "10000000000",
-  "CHAIN": "mainnet",
-  "DEFAULT_WALLET": ""
-}
diff --git a/generate-erc1155.js b/generate-erc1155.js
new file mode 100644
index 0000000..3cd7787
--- /dev/null
+++ b/generate-erc1155.js
@@ -0,0 +1,75 @@
+const fs = require('fs')
+const path = require('path')
+const ora = require('ora')
+const term = require('terminal-kit').terminal
+const ethers = require('ethers')
+const fastcsv = require('fast-csv')
+const LinkdropSDK = require('@linkdrop/sdk').default
+const config = require('./config')
+
+;(async () => {
+  let spinner
+  try {
+    spinner = ora({
+      text: term.bold.green.str('Generating links'),
+      color: 'green'
+    })
+    spinner.start()
+
+    const linkdropSDK = new LinkdropSDK({
+      linkdropMasterAddress: config.LINKDROP_MASTER_ADDRESS,
+      factoryAddress: config.FACTORY_ADDRESS || '0xBa051891B752ecE3670671812486fe8dd34CC1c8',
+      chain: config.CHAIN || 'mainnet',
+      claimHost: config.CLAIM_HOST,
+      jsonRpcUrl: config.JSON_RPC_URL,
+      apiHost: config.API_HOST
+    })
+
+    const proxyAddress = linkdropSDK.getProxyAddress(config.CAMPAIGN_ID)
+
+    // Generate links
+    const links = []
+    const tokenIds = JSON.parse(decodeURI(config.TOKEN_IDS))
+
+    for (let i = 0; i < config.LINKS_NUMBER; i++) {
+
+      const {
+        url
+      } = await linkdropSDK.generateLinkERC1155({
+        signingKeyOrWallet: config.SIGNING_KEY,
+        weiAmount: config.WEI_AMOUNT || 0,
+        nftAddress: config.TOKEN_ADDRESS || ethers.constants.AddressZero,
+        tokenAmount: config.TOKENS_AMOUNT || 0,
+        expirationTime: config.EXPIRATION_TIME || 10000000000,
+        campaignId: config.CAMPAIGN_ID || 1,
+        wallet: config.DEFAULT_WALLET,
+        tokenId: tokenIds[i]
+      })
+
+      const finalUrl = config.MANUAL === "true" ? `${url}&manual=true` : url
+
+      links.push({ url: finalUrl })
+    }
+
+    // Save links
+    const dir = path.join(__dirname, './output')
+    const filename = path.join(dir, 'linkdrop.csv')
+
+    try {
+      if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir)
+      }
+      const ws = fs.createWriteStream(filename)
+      fastcsv.write(links).pipe(ws)
+    } catch (err) {
+      throw new Error(err)
+    }
+
+    spinner.succeed(term.bold.str(`Saved generated links to ^_${filename}`))
+
+    return links
+  } catch (err) {
+    spinner.fail(term.bold.red.str('Failed to generate links'))
+    throw new Error(err)
+  }
+})()
diff --git a/index.js b/generate-erc20.js
similarity index 87%
rename from index.js
rename to generate-erc20.js
index 1b4947c..2f9fe97 100644
--- a/index.js
+++ b/generate-erc20.js
@@ -18,9 +18,11 @@ const config = require('./config')
 
     const linkdropSDK = new LinkdropSDK({
       linkdropMasterAddress: config.LINKDROP_MASTER_ADDRESS,
-      factoryAddress:
-        config.FACTORY_ADDRESS || '0xBa051891B752ecE3670671812486fe8dd34CC1c8',
-      chain: config.CHAIN || 'mainnet'
+      factoryAddress: config.FACTORY_ADDRESS || '0xBa051891B752ecE3670671812486fe8dd34CC1c8',
+      chain: config.CHAIN || 'mainnet',
+      claimHost: config.CLAIM_HOST,
+      jsonRpcUrl: config.JSON_RPC_URL,
+      apiHost: config.API_HOST
     })
 
     const proxyAddress = linkdropSDK.getProxyAddress(config.CAMPAIGN_ID)
@@ -30,10 +32,7 @@ const config = require('./config')
 
     for (let i = 0; i < config.LINKS_NUMBER; i++) {
       const {
-        url,
-        linkId,
-        linkKey,
-        linkdropSignerSignature
+        url
       } = await linkdropSDK.generateLink({
         signingKeyOrWallet: config.SIGNING_KEY,
         weiAmount: config.WEI_AMOUNT || 0,
diff --git a/generate-erc721.js b/generate-erc721.js
new file mode 100644
index 0000000..a30a0d7
--- /dev/null
+++ b/generate-erc721.js
@@ -0,0 +1,73 @@
+const fs = require('fs')
+const path = require('path')
+const ora = require('ora')
+const term = require('terminal-kit').terminal
+const ethers = require('ethers')
+const fastcsv = require('fast-csv')
+const LinkdropSDK = require('@linkdrop/sdk').default
+const config = require('./config')
+
+;(async () => {
+  let spinner
+  try {
+    spinner = ora({
+      text: term.bold.green.str('Generating links'),
+      color: 'green'
+    })
+    spinner.start()
+
+    const linkdropSDK = new LinkdropSDK({
+      linkdropMasterAddress: config.LINKDROP_MASTER_ADDRESS,
+      factoryAddress: config.FACTORY_ADDRESS || '0xBa051891B752ecE3670671812486fe8dd34CC1c8',
+      chain: config.CHAIN || 'mainnet',
+      claimHost: config.CLAIM_HOST,
+      jsonRpcUrl: config.JSON_RPC_URL,
+      apiHost: config.API_HOST
+    })
+    
+
+    const proxyAddress = linkdropSDK.getProxyAddress(config.CAMPAIGN_ID)
+
+    // Generate links
+    const links = []
+
+    const tokenIds = JSON.parse(decodeURI(config.TOKEN_IDS))
+
+    for (let i = 0; i < config.LINKS_NUMBER; i++) {
+      const {
+        url
+      } = await linkdropSDK.generateLinkERC721({
+        signingKeyOrWallet: config.SIGNING_KEY,
+        weiAmount: config.WEI_AMOUNT || 0,
+        expirationTime: config.EXPIRATION_TIME || 10000000000,
+        campaignId: config.CAMPAIGN_ID || 1,
+        wallet: config.DEFAULT_WALLET,
+        nftAddress: config.TOKEN_ADDRESS || ethers.constants.AddressZero,
+        tokenId: tokenIds[i]
+      })
+
+      links.push({ url })
+    }
+
+    // Save links
+    const dir = path.join(__dirname, './output')
+    const filename = path.join(dir, 'linkdrop.csv')
+
+    try {
+      if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir)
+      }
+      const ws = fs.createWriteStream(filename)
+      fastcsv.write(links).pipe(ws)
+    } catch (err) {
+      throw new Error(err)
+    }
+
+    spinner.succeed(term.bold.str(`Saved generated links to ^_${filename}`))
+
+    return links
+  } catch (err) {
+    spinner.fail(term.bold.red.str('Failed to generate links'))
+    throw new Error(err)
+  }
+})()
diff --git a/package.json b/package.json
index fc90c60..a963c06 100644
--- a/package.json
+++ b/package.json
@@ -6,10 +6,14 @@
   "author": "Amir Jumaniyazov <amir@linkdrop.io>",
   "license": "MIT",
   "private": false,
-  "scripts": { "generate": "node index" },
+  "scripts": {
+    "generate-erc20": "node generate-erc20.js",
+    "generate-erc721": "node generate-erc721.js",
+    "generate-erc1155": "node generate-erc1155.js"
+  },
   "dependencies": {
     "@babel/runtime": "^7.7.7",
-    "@linkdrop/sdk": "^1.1.2",
+    "@linkdrop/sdk": "^1.2.0",
     "ethers": "^4.0.41",
     "fast-csv": "^4.0.1",
     "ora": "^4.0.3",
diff --git a/yarn.lock b/yarn.lock
index 34c5a93..872835b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -44,24 +44,25 @@
     lodash.isundefined "^3.0.1"
     lodash.uniq "^4.5.0"
 
-"@linkdrop/contracts@^1.1.2":
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/@linkdrop/contracts/-/contracts-1.1.2.tgz#8807984751da9f3e4ee83a1587efd91f7e74ebfb"
-  integrity sha512-N+KQ+O2uNyPhcR+0VoBBsNZrjTqc1VOmCIR1NBQhF4rMN3cs7lP+G/KkyZ1cPvxyscnpSltG7d5DaTl3C0ehkA==
+"@linkdrop/contracts@^1.2.0":
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/@linkdrop/contracts/-/contracts-1.2.0.tgz#29d59758be6fa085a38154aabc868a2f3a09d950"
+  integrity sha512-cYZUAuBbfUFQDuZ39w6/4cN+oqDWjaRBpldYUZ8SMegDijucpoahZl5lcrRYN9OvYecWbeSACgoSaPvtGCJXKQ==
   dependencies:
-    "@linkdrop/sdk" "^1.1.2"
+    "@linkdrop/sdk" "^1.2.0"
     ethereum-waffle "^2.0.14"
     ethers "^4.0.27"
-    openzeppelin-solidity "^2.2.0"
+    openzeppelin-solidity "^3.4.0"
     solc "^0.5.10"
 
-"@linkdrop/sdk@^1.1.2":
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/@linkdrop/sdk/-/sdk-1.1.2.tgz#e15e6b172d6351887441a2c40d8bdbb85ec0d256"
-  integrity sha512-11aS+QPB3Uma9scVYuoqBEnHw4LzPN5qgmTYkU37zM+qz5jtiB1B4hgbY+W1lzjtLTBfnNFxHZpfUxy/CP/oig==
+"@linkdrop/sdk@^1.2.0":
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/@linkdrop/sdk/-/sdk-1.2.0.tgz#75cf13af4ced8ae63958ff69d3c86f3e7e7d2624"
+  integrity sha512-GmOILxAeppcefWkidAoaF2KEfhigVoNXXCY3m6dFYRKTYg5Z0s2vBn4AIaikpNhxWArzphluKDChhaMMWya42A==
   dependencies:
-    "@linkdrop/contracts" "^1.1.2"
+    "@linkdrop/contracts" "^1.2.0"
     axios "^0.18.1"
+    ethereumjs-wallet "^0.6.3"
     ethers "^4.0.27"
 
 "@resolver-engine/core@^0.3.3":
@@ -147,6 +148,20 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-12.12.22.tgz#b8d9eae3328b96910a373cf06ac8d3c5abe9c200"
   integrity sha512-r5i93jqbPWGXYXxianGATOxTelkp6ih/U0WVnvaqAvTqM+0U6J3kw6Xk6uq/dWNRkEVw/0SLcO5ORXbVNz4FMQ==
 
+"@types/pbkdf2@^3.0.0":
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/@types/pbkdf2/-/pbkdf2-3.1.0.tgz#039a0e9b67da0cdc4ee5dab865caa6b267bb66b1"
+  integrity sha512-Cf63Rv7jCQ0LaL8tNXmEyqTHuIJxRdlS5vMh1mj5voN4+QFhVZnlZruezqpWYDiJ8UTzhP0VmeLXCmBk66YrMQ==
+  dependencies:
+    "@types/node" "*"
+
+"@types/secp256k1@^4.0.1":
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/@types/secp256k1/-/secp256k1-4.0.3.tgz#1b8e55d8e00f08ee7220b4d59a6abe89c37a901c"
+  integrity sha512-Da66lEIFeIz9ltsdMZcpQvmrmmoqrfju8pm1BH8WbYjZSwUgCwXLb9C+9XYogwBITnbsSaMdVPb2ekf7TV+03w==
+  dependencies:
+    "@types/node" "*"
+
 abstract-leveldown@3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/abstract-leveldown/-/abstract-leveldown-3.0.0.tgz#5cb89f958a44f526779d740d1440e743e0c30a57"
@@ -1073,6 +1088,11 @@ bl@^1.0.0:
     readable-stream "^2.3.5"
     safe-buffer "^5.1.1"
 
+blakejs@^1.1.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/blakejs/-/blakejs-1.1.1.tgz#bf313053978b2cd4c444a48795710be05c785702"
+  integrity sha512-bLG6PHOCZJKNshTjGRBvET0vTciwQE6zFKOKKXPDJfwFBd4Ac0yBfPZqcGvGJap50l7ktvlpFqc2jGVaUgbJgg==
+
 bluebird@^3.5.0:
   version "3.7.2"
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.7.2.tgz#9f229c15be272454ffa973ace0dbee79a1b0c36f"
@@ -1088,6 +1108,11 @@ bn.js@4.11.8, bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.1.1, bn.js@^4.10.0, bn.js@^4.
   resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.11.8.tgz#2cde09eb5ee341f484746bb0309b3253b1b1442f"
   integrity sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==
 
+bn.js@^4.11.9:
+  version "4.12.0"
+  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.12.0.tgz#775b3f278efbb9718eec7361f483fb36fbbfea88"
+  integrity sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==
+
 body-parser@1.19.0, body-parser@^1.16.0:
   version "1.19.0"
   resolved "https://registry.yarnpkg.com/body-parser/-/body-parser-1.19.0.tgz#96b2709e57c9c4e09a6fd66a8fd979844f69f08a"
@@ -1128,12 +1153,12 @@ braces@^2.3.1, braces@^2.3.2:
     split-string "^3.0.2"
     to-regex "^3.0.1"
 
-brorand@^1.0.1:
+brorand@^1.0.1, brorand@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/brorand/-/brorand-1.1.0.tgz#12c25efe40a45e3c323eb8675a0a0ce57b22371f"
   integrity sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=
 
-browserify-aes@^1.0.0, browserify-aes@^1.0.4, browserify-aes@^1.0.6:
+browserify-aes@^1.0.0, browserify-aes@^1.0.4, browserify-aes@^1.0.6, browserify-aes@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/browserify-aes/-/browserify-aes-1.2.0.tgz#326734642f403dabc3003209853bb70ad428ef48"
   integrity sha512-+7CHXqGuspUn/Sl5aO7Ea0xWGAtETPXNSAjHo48JfLdPWcMng33Xe4znFvQweqc/uzk5zSOI3H52CYnjCfb5hA==
@@ -1672,7 +1697,7 @@ create-hash@^1.1.0, create-hash@^1.1.1, create-hash@^1.1.2, create-hash@^1.2.0:
     ripemd160 "^2.0.1"
     sha.js "^2.4.0"
 
-create-hmac@^1.1.0, create-hmac@^1.1.2, create-hmac@^1.1.4:
+create-hmac@^1.1.0, create-hmac@^1.1.2, create-hmac@^1.1.4, create-hmac@^1.1.7:
   version "1.1.7"
   resolved "https://registry.yarnpkg.com/create-hmac/-/create-hmac-1.1.7.tgz#69170c78b3ab957147b2b8b04572e47ead2243ff"
   integrity sha512-MJG9liiZ+ogc4TzUwuvbER1JRdgvUFSB5+VR/g5h82fGaIRWMWddtKBHi7/sVhfjQZ6SehlyhvQYrcYkaUIpLg==
@@ -2045,6 +2070,19 @@ elliptic@6.5.2, elliptic@^6.0.0, elliptic@^6.4.0, elliptic@^6.5.2:
     minimalistic-assert "^1.0.0"
     minimalistic-crypto-utils "^1.0.0"
 
+elliptic@^6.5.4:
+  version "6.5.4"
+  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.4.tgz#da37cebd31e79a1367e941b592ed1fbebd58abbb"
+  integrity sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==
+  dependencies:
+    bn.js "^4.11.9"
+    brorand "^1.1.0"
+    hash.js "^1.0.0"
+    hmac-drbg "^1.0.1"
+    inherits "^2.0.4"
+    minimalistic-assert "^1.0.1"
+    minimalistic-crypto-utils "^1.0.1"
+
 encodeurl@~1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/encodeurl/-/encodeurl-1.0.2.tgz#ad3ff4c86ec2d029322f5a02c3a9a606c95b3f59"
@@ -2306,6 +2344,27 @@ ethereum-common@^0.0.18:
   resolved "https://registry.yarnpkg.com/ethereum-common/-/ethereum-common-0.0.18.tgz#2fdc3576f232903358976eb39da783213ff9523f"
   integrity sha1-L9w1dvIykDNYl26znaeDIT/5Uj8=
 
+ethereum-cryptography@^0.1.3:
+  version "0.1.3"
+  resolved "https://registry.yarnpkg.com/ethereum-cryptography/-/ethereum-cryptography-0.1.3.tgz#8d6143cfc3d74bf79bbd8edecdf29e4ae20dd191"
+  integrity sha512-w8/4x1SGGzc+tO97TASLja6SLd3fRIK2tLVcV2Gx4IB21hE19atll5Cq9o3d0ZmAYC/8aw0ipieTSiekAea4SQ==
+  dependencies:
+    "@types/pbkdf2" "^3.0.0"
+    "@types/secp256k1" "^4.0.1"
+    blakejs "^1.1.0"
+    browserify-aes "^1.2.0"
+    bs58check "^2.1.2"
+    create-hash "^1.2.0"
+    create-hmac "^1.1.7"
+    hash.js "^1.1.7"
+    keccak "^3.0.0"
+    pbkdf2 "^3.0.17"
+    randombytes "^2.1.0"
+    safe-buffer "^5.1.2"
+    scrypt-js "^3.0.0"
+    secp256k1 "^4.0.1"
+    setimmediate "^1.0.5"
+
 ethereum-waffle@^2.0.14:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/ethereum-waffle/-/ethereum-waffle-2.2.0.tgz#14faef4c2304b1e8c979eed6a8f1c69027c31e17"
@@ -2543,6 +2602,21 @@ ethereumjs-wallet@0.6.3:
     utf8 "^3.0.0"
     uuid "^3.3.2"
 
+ethereumjs-wallet@^0.6.3:
+  version "0.6.5"
+  resolved "https://registry.yarnpkg.com/ethereumjs-wallet/-/ethereumjs-wallet-0.6.5.tgz#685e9091645cee230ad125c007658833991ed474"
+  integrity sha512-MDwjwB9VQVnpp/Dc1XzA6J1a3wgHQ4hSvA1uWNatdpOrtCbPVuQSKSyRnjLvS0a+KKMw2pvQ9Ybqpb3+eW8oNA==
+  dependencies:
+    aes-js "^3.1.1"
+    bs58check "^2.1.2"
+    ethereum-cryptography "^0.1.3"
+    ethereumjs-util "^6.0.0"
+    randombytes "^2.0.6"
+    safe-buffer "^5.1.2"
+    scryptsy "^1.2.1"
+    utf8 "^3.0.0"
+    uuid "^3.3.2"
+
 ethers@4.0.0-beta.3:
   version "4.0.0-beta.3"
   resolved "https://registry.yarnpkg.com/ethers/-/ethers-4.0.0-beta.3.tgz#15bef14e57e94ecbeb7f9b39dd0a4bd435bc9066"
@@ -3339,7 +3413,7 @@ hash.js@1.1.3:
     inherits "^2.0.3"
     minimalistic-assert "^1.0.0"
 
-hash.js@^1.0.0, hash.js@^1.0.3:
+hash.js@^1.0.0, hash.js@^1.0.3, hash.js@^1.1.7:
   version "1.1.7"
   resolved "https://registry.yarnpkg.com/hash.js/-/hash.js-1.1.7.tgz#0babca538e8d4ee4a0f8988d68866537a003cf42"
   integrity sha512-taOaskGt4z4SOANNseOviYDvjEJinIkRgmp7LbKP2YTTmVxWBl87s/uzK9r+44BclBSp2X7K1hqeNfz9JbBeXA==
@@ -3361,7 +3435,7 @@ heap@0.2.6:
   resolved "https://registry.yarnpkg.com/heap/-/heap-0.2.6.tgz#087e1f10b046932fc8594dd9e6d378afc9d1e5ac"
   integrity sha1-CH4fELBGky/IWU3Z5tN4r8nR5aw=
 
-hmac-drbg@^1.0.0:
+hmac-drbg@^1.0.0, hmac-drbg@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
   integrity sha1-0nRXAQJabHdabFRXk+1QL8DGSaE=
@@ -3963,6 +4037,15 @@ keccak@^2.0.0:
     nan "^2.14.0"
     safe-buffer "^5.2.0"
 
+keccak@^3.0.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/keccak/-/keccak-3.0.2.tgz#4c2c6e8c54e04f2670ee49fa734eb9da152206e0"
+  integrity sha512-PyKKjkH53wDMLGrvmRGSNWgmSxZOUqbnXwKL9tmgbFYA1iAYqW21kfR7mZXV0MlESiefxQQE9X9fTa3X+2MPDQ==
+  dependencies:
+    node-addon-api "^2.0.0"
+    node-gyp-build "^4.2.0"
+    readable-stream "^3.6.0"
+
 keccakjs@^0.2.0:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/keccakjs/-/keccakjs-0.2.3.tgz#5e4e969ce39689a3861f445d7752ee3477f9fe72"
@@ -4626,6 +4709,11 @@ nextgen-events@^1.3.0:
   resolved "https://registry.yarnpkg.com/nextgen-events/-/nextgen-events-1.3.0.tgz#a32665d1ab6f026448b19d75c4603ec20292fa22"
   integrity sha512-eBz5mrO4Hw2eenPVm0AVPHuAzg/RZetAWMI547RH8O9+a0UYhCysiZ3KoNWslnWNlHetb9kzowEshsKsmFo2YQ==
 
+node-addon-api@^2.0.0:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/node-addon-api/-/node-addon-api-2.0.2.tgz#432cfa82962ce494b132e9d72a15b29f71ff5d32"
+  integrity sha512-Ntyt4AIXyaLIuMHF6IOoTakB3K+RWxwtsHNRxllEoA6vPwP9o4866g6YWDLUdnucilZhmkxiHwHr11gAENw+QA==
+
 node-bitmap@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/node-bitmap/-/node-bitmap-0.0.1.tgz#180eac7003e0c707618ef31368f62f84b2a69091"
@@ -4644,6 +4732,11 @@ node-fetch@~1.7.1:
     encoding "^0.1.11"
     is-stream "^1.0.1"
 
+node-gyp-build@^4.2.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/node-gyp-build/-/node-gyp-build-4.3.0.tgz#9f256b03e5826150be39c764bf51e993946d71a3"
+  integrity sha512-iWjXZvmboq0ja1pUGULQBexmxq8CV4xBhX7VDOTbL7ZR4FOowwY/VOtRxBN/yKxmdGoIp4j5ysNT4u3S2pDQ3Q==
+
 normalize-package-data@^2.3.2:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"
@@ -4813,10 +4906,10 @@ onetime@^5.1.0:
   dependencies:
     mimic-fn "^2.1.0"
 
-openzeppelin-solidity@^2.2.0:
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/openzeppelin-solidity/-/openzeppelin-solidity-2.4.0.tgz#5f0a7b30571c45493449166e57b947203415349d"
-  integrity sha512-533gc5jkspxW5YT0qJo02Za5q1LHwXK9CJCc48jNj/22ncNM/3M/3JfWLqfpB90uqLwOKOovpl0JfaMQTR+gXQ==
+openzeppelin-solidity@^3.4.0:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/openzeppelin-solidity/-/openzeppelin-solidity-3.4.2.tgz#ec9b3d701c459e6075691bbda642d54290e0c7ab"
+  integrity sha512-mpk74A6Bo+/ISfalUqtD8bAfINQgkGH2yInUFn/uBYz1pXbefwMTApjlnCYr+HpQpeOgO7nO8deJYrzBGDFDMA==
 
 ora@^4.0.3:
   version "4.0.3"
@@ -4989,6 +5082,17 @@ path-type@^1.0.0:
     pify "^2.0.0"
     pinkie-promise "^2.0.0"
 
+pbkdf2@^3.0.17:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.1.2.tgz#dd822aa0887580e52f1a039dc3eda108efae3075"
+  integrity sha512-iuh7L6jA7JEGu2WxDwtQP1ddOpaJNC4KlDEFfdQajSGgGPNi4OyDc2R7QnbY2bR9QjBVGwgvTdNJZoE7RaxUMA==
+  dependencies:
+    create-hash "^1.1.2"
+    create-hmac "^1.1.4"
+    ripemd160 "^2.0.1"
+    safe-buffer "^5.0.1"
+    sha.js "^2.4.8"
+
 pbkdf2@^3.0.3, pbkdf2@^3.0.9:
   version "3.0.17"
   resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.0.17.tgz#976c206530617b14ebb32114239f7b09336e93a6"
@@ -5237,7 +5341,7 @@ querystring@0.2.0:
   resolved "https://registry.yarnpkg.com/querystring/-/querystring-0.2.0.tgz#b209849203bb25df820da756e747005878521620"
   integrity sha1-sgmEkgO7Jd+CDadW50cAWHhSFiA=
 
-randombytes@^2.0.0, randombytes@^2.0.1, randombytes@^2.0.5, randombytes@^2.0.6:
+randombytes@^2.0.0, randombytes@^2.0.1, randombytes@^2.0.5, randombytes@^2.0.6, randombytes@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"
   integrity sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==
@@ -5312,6 +5416,15 @@ readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable
     string_decoder "~1.1.1"
     util-deprecate "~1.0.1"
 
+readable-stream@^3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.6.0.tgz#337bbda3adc0706bd3e024426a286d4b4b2c9198"
+  integrity sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==
+  dependencies:
+    inherits "^2.0.3"
+    string_decoder "^1.1.1"
+    util-deprecate "^1.0.1"
+
 readable-stream@~1.0.15:
   version "1.0.34"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-1.0.34.tgz#125820e34bc842d2f2aaafafe4c2916ee32c157c"
@@ -5584,6 +5697,11 @@ safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2,
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.0.tgz#b74daec49b1148f88c64b68d49b1e815c1f2f519"
   integrity sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==
 
+safe-buffer@~5.2.0:
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
+  integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
+
 safe-event-emitter@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/safe-event-emitter/-/safe-event-emitter-1.0.1.tgz#5b692ef22329ed8f69fdce607e50ca734f6f20af"
@@ -5613,6 +5731,11 @@ scrypt-js@2.0.4:
   resolved "https://registry.yarnpkg.com/scrypt-js/-/scrypt-js-2.0.4.tgz#32f8c5149f0797672e551c07e230f834b6af5f16"
   integrity sha512-4KsaGcPnuhtCZQCxFxN3GVYIhKFPTdLd8PLC552XwbMndtD0cjRFAhDuuydXQ0h08ZfPgzqe6EKHozpuH74iDw==
 
+scrypt-js@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/scrypt-js/-/scrypt-js-3.0.1.tgz#d314a57c2aef69d1ad98a138a21fe9eafa9ee312"
+  integrity sha512-cdwTTnqPu0Hyvf5in5asVdZocVDTNRmR7XEcJuIzMjJeSHybHl7vpB66AzwTaIg6CLSbtjcxc8fqcySfnTkccA==
+
 scrypt.js@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/scrypt.js/-/scrypt.js-0.3.0.tgz#6c62d61728ad533c8c376a2e5e3e86d41a95c4c0"
@@ -5655,6 +5778,15 @@ secp256k1@^3.0.1:
     nan "^2.14.0"
     safe-buffer "^5.1.2"
 
+secp256k1@^4.0.1:
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/secp256k1/-/secp256k1-4.0.3.tgz#c4559ecd1b8d3c1827ed2d1b94190d69ce267303"
+  integrity sha512-NLZVf+ROMxwtEj3Xa562qgv2BK5e2WNmXPiOdVIPLgs6lyTzMvBq0aWTYMI5XCP9jZMVKOcqZLw/Wc4vDkuxhA==
+  dependencies:
+    elliptic "^6.5.4"
+    node-addon-api "^2.0.0"
+    node-gyp-build "^4.2.0"
+
 seedrandom@3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/seedrandom/-/seedrandom-3.0.1.tgz#eb3dde015bcf55df05a233514e5df44ef9dce083"
@@ -6045,6 +6177,13 @@ string.prototype.trimright@^2.1.1:
     define-properties "^1.1.3"
     function-bind "^1.1.1"
 
+string_decoder@^1.1.1:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.3.0.tgz#42f114594a46cf1a8e30b0a84f56c78c3edac21e"
+  integrity sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==
+  dependencies:
+    safe-buffer "~5.2.0"
+
 string_decoder@~0.10.x:
   version "0.10.31"
   resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-0.10.31.tgz#62e203bc41766c6c28c9fc84301dab1c5310fa94"
@@ -6537,7 +6676,7 @@ utf8@3.0.0, utf8@^3.0.0:
   resolved "https://registry.yarnpkg.com/utf8/-/utf8-3.0.0.tgz#f052eed1364d696e769ef058b183df88c87f69d1"
   integrity sha512-E8VjFIQ/TyQgp+TZfS6l8yp/xWppSAHzidGiRrqe4bK4XP9pTRyKFgGJpO3SN7zdX4DeomTrwaseCHovfpFcqQ==
 
-util-deprecate@~1.0.1:
+util-deprecate@^1.0.1, util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
   integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=
@@ -6924,7 +7063,6 @@ websocket@1.0.29:
   dependencies:
     debug "^2.2.0"
     es5-ext "^0.10.50"
-    gulp "^4.0.2"
     nan "^2.14.0"
     typedarray-to-buffer "^3.1.5"
     yaeti "^0.0.6"