diff --git a/.travis.yml b/.travis.yml
index 00dc427..aaa4646 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,3 +8,4 @@ rvm:
 before_script:
 - cp config/database.yml{.sample,}
 - bundle exec rake db:create db:test:prepare
+- yarn install
diff --git a/Gemfile.lock b/Gemfile.lock
index 36f73ab..24c4598 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -430,4 +430,4 @@ DEPENDENCIES
   webmock
 
 BUNDLED WITH
-   1.16.1
+   1.16.2
diff --git a/app/lib/btc/address_generator.rb b/app/lib/btc/address_generator.rb
index 4f1c9e5..3b45df5 100644
--- a/app/lib/btc/address_generator.rb
+++ b/app/lib/btc/address_generator.rb
@@ -24,11 +24,18 @@ def address(idx)
     private
 
     def multisig_address(idx)
-      keychain_group = BTC::KeychainGroup.new(extended_keys: xpub)
-      keychain_group.standard_address({
-        index: idx,
-        signatures_required: signatures_required,
-      })
+      keychains = xpub.map { |x| BTC::Keychain.new(extended_key: x) }
+      keys = keychains.map { |keychain| keychain.derived_key(idx) }
+      public_keys = keys.map { |key| BTC.to_hex(key.public_key) }.sort
+
+      command = [
+        "node",
+        Rails.root.join("lib", "address_gen.js"),
+        public_keys.join(","),
+        signatures_required,
+      ].join(" ")
+      stdout_str, stderr_str, status = Open3.capture3(command)
+      stdout_str.chomp
     end
 
     def single_address(idx)
diff --git a/docs/bitcoin.md b/docs/bitcoin.md
index 3e0d01f..2c5d5bc 100644
--- a/docs/bitcoin.md
+++ b/docs/bitcoin.md
@@ -7,3 +7,13 @@ Bitcoin addresses will be generated from the supplied `BTC_MASTER_PUBLIC_KEY`.
 ## Bitcoind setup
 
 - Set `txindex=1` to [index all transactions](https://bitcore.io/guides/full-node/).
+
+## Tips
+
+If you will be using a wallet like Electrum to manage the funds, the master public key you find there *is not* the one you should place here. The key placed here can be derived the following manner:
+
+```sh
+ruby scripts/electrum.rb master_public_key_you_see_in_electrum
+```
+
+Of course, test that the addresses generated by this application are the same as the receiving addresses in Electrum.
diff --git a/lib/address_gen.js b/lib/address_gen.js
new file mode 100644
index 0000000..ed7432e
--- /dev/null
+++ b/lib/address_gen.js
@@ -0,0 +1,10 @@
+let bitcoin = require('bitcoinjs-lib')
+
+let pubKeys = process.argv[2].split(",").sort().map(function (hex) { return Buffer.from(hex, 'hex') })
+let signaturesRequired = parseInt(process.argv[3])
+
+var redeemScript = bitcoin.script.multisig.output.encode(signaturesRequired, pubKeys)
+var scriptPubKey = bitcoin.script.scriptHash.output.encode(bitcoin.crypto.hash160(redeemScript))
+var address = bitcoin.address.fromOutputScript(scriptPubKey)
+
+console.log(address)
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..0ec2f71
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,208 @@
+{
+  "name": "crypto_cold_store",
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
+    "base-x": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.4.tgz",
+      "integrity": "sha512-UYOadoSIkEI/VrRGSG6qp93rp2WdokiAiNYDfGW5qURAY8GiAQkvMbwNNSDYiVJopqv4gCna7xqf4rrNGp+5AA==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "bech32": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/bech32/-/bech32-1.1.3.tgz",
+      "integrity": "sha512-yuVFUvrNcoJi0sv5phmqc6P+Fl1HjRDRNOOkHY2X/3LBy2bIGNSFx4fZ95HMaXHupuS7cZR15AsvtmCIF4UEyg=="
+    },
+    "bigi": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/bigi/-/bigi-1.4.2.tgz",
+      "integrity": "sha1-nGZalfiLiwj8Bc/XMfVhhZ1yWCU="
+    },
+    "bip66": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/bip66/-/bip66-1.1.5.tgz",
+      "integrity": "sha1-AfqHSHhcpwlV1QESF9GzE5lpyiI=",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "bitcoin-ops": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/bitcoin-ops/-/bitcoin-ops-1.4.1.tgz",
+      "integrity": "sha512-pef6gxZFztEhaE9RY9HmWVmiIHqCb2OyS4HPKkpc6CIiiOa3Qmuoylxc5P2EkU3w+5eTSifI9SEZC88idAIGow=="
+    },
+    "bitcoinjs-lib": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/bitcoinjs-lib/-/bitcoinjs-lib-3.3.2.tgz",
+      "integrity": "sha512-l5qqvbaK8wwtANPf6oEffykycg4383XgEYdia1rI7/JpGf1jfRWlOUCvx5TiTZS7kyIvY4j/UhIQ2urLsvGkzw==",
+      "requires": {
+        "bech32": "1.1.3",
+        "bigi": "1.4.2",
+        "bip66": "1.1.5",
+        "bitcoin-ops": "1.4.1",
+        "bs58check": "2.1.1",
+        "create-hash": "1.2.0",
+        "create-hmac": "1.1.7",
+        "ecurve": "1.0.6",
+        "merkle-lib": "2.0.10",
+        "pushdata-bitcoin": "1.0.1",
+        "randombytes": "2.0.6",
+        "safe-buffer": "5.1.2",
+        "typeforce": "1.12.0",
+        "varuint-bitcoin": "1.1.0",
+        "wif": "2.0.6"
+      }
+    },
+    "bs58": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/bs58/-/bs58-4.0.1.tgz",
+      "integrity": "sha1-vhYedsNU9veIrkBx9j806MTwpCo=",
+      "requires": {
+        "base-x": "3.0.4"
+      }
+    },
+    "bs58check": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/bs58check/-/bs58check-2.1.1.tgz",
+      "integrity": "sha512-okRQiWc5FJuA2VOwQ1hB7Sf0MyEFg/EwRN12h4b8HrJoGkZ3xq1CGjkaAfYloLcZyqixQnO5mhPpN6IcHSplVg==",
+      "requires": {
+        "bs58": "4.0.1",
+        "create-hash": "1.2.0"
+      }
+    },
+    "cipher-base": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
+      "integrity": "sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==",
+      "requires": {
+        "inherits": "2.0.3",
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "create-hash": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/create-hash/-/create-hash-1.2.0.tgz",
+      "integrity": "sha512-z00bCGNHDG8mHAkP7CtT1qVu+bFQUPjYq/4Iv3C3kWjTFV10zIjfSoeqXo9Asws8gwSHDGj/hl2u4OGIjapeCg==",
+      "requires": {
+        "cipher-base": "1.0.4",
+        "inherits": "2.0.3",
+        "md5.js": "1.3.4",
+        "ripemd160": "2.0.2",
+        "sha.js": "2.4.11"
+      }
+    },
+    "create-hmac": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/create-hmac/-/create-hmac-1.1.7.tgz",
+      "integrity": "sha512-MJG9liiZ+ogc4TzUwuvbER1JRdgvUFSB5+VR/g5h82fGaIRWMWddtKBHi7/sVhfjQZ6SehlyhvQYrcYkaUIpLg==",
+      "requires": {
+        "cipher-base": "1.0.4",
+        "create-hash": "1.2.0",
+        "inherits": "2.0.3",
+        "ripemd160": "2.0.2",
+        "safe-buffer": "5.1.2",
+        "sha.js": "2.4.11"
+      }
+    },
+    "ecurve": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/ecurve/-/ecurve-1.0.6.tgz",
+      "integrity": "sha512-/BzEjNfiSuB7jIWKcS/z8FK9jNjmEWvUV2YZ4RLSmcDtP7Lq0m6FvDuSnJpBlDpGRpfRQeTLGLBI8H+kEv0r+w==",
+      "requires": {
+        "bigi": "1.4.2",
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "hash-base": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/hash-base/-/hash-base-3.0.4.tgz",
+      "integrity": "sha1-X8hoaEfs1zSZQDMZprCj8/auSRg=",
+      "requires": {
+        "inherits": "2.0.3",
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "inherits": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+    },
+    "md5.js": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/md5.js/-/md5.js-1.3.4.tgz",
+      "integrity": "sha1-6b296UogpawYsENA/Fdk1bCdkB0=",
+      "requires": {
+        "hash-base": "3.0.4",
+        "inherits": "2.0.3"
+      }
+    },
+    "merkle-lib": {
+      "version": "2.0.10",
+      "resolved": "https://registry.npmjs.org/merkle-lib/-/merkle-lib-2.0.10.tgz",
+      "integrity": "sha1-grjbrnXieneFOItz+ddyXQ9vMyY="
+    },
+    "pushdata-bitcoin": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/pushdata-bitcoin/-/pushdata-bitcoin-1.0.1.tgz",
+      "integrity": "sha1-FZMdPNlnreUiBvUjqnMxrvfUOvc=",
+      "requires": {
+        "bitcoin-ops": "1.4.1"
+      }
+    },
+    "randombytes": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.0.6.tgz",
+      "integrity": "sha512-CIQ5OFxf4Jou6uOKe9t1AOgqpeU5fd70A8NPdHSGeYXqXsPe6peOwI0cUl88RWZ6sP1vPMV3avd/R6cZ5/sP1A==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "ripemd160": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.2.tgz",
+      "integrity": "sha512-ii4iagi25WusVoiC4B4lq7pbXfAp3D9v5CwfkY33vffw2+pkDjY1D8GaN7spsxvCSx8dkPqOZCEZyfxcmJG2IA==",
+      "requires": {
+        "hash-base": "3.0.4",
+        "inherits": "2.0.3"
+      }
+    },
+    "safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+    },
+    "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": "2.0.3",
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "typeforce": {
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/typeforce/-/typeforce-1.12.0.tgz",
+      "integrity": "sha512-fvnkvueAOFLhtAqDgIA/wMP21SMwS/NQESFKZuwVrj5m/Ew6eK2S0z0iB++cwtROPWDOhaT6OUfla8UwMw4Adg=="
+    },
+    "varuint-bitcoin": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/varuint-bitcoin/-/varuint-bitcoin-1.1.0.tgz",
+      "integrity": "sha512-jCEPG+COU/1Rp84neKTyDJQr478/hAfVp5xxYn09QEH0yBjbmPeMfuuQIrp+BUD83hybtYZKhr5elV3bvdV1bA==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "wif": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/wif/-/wif-2.0.6.tgz",
+      "integrity": "sha1-CNP1IFbGZnkplyb63g1DKudLRwQ=",
+      "requires": {
+        "bs58check": "2.1.1"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 9fc5c5a..bbec19b 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,7 @@
 {
   "name": "crypto_cold_store",
   "private": true,
-  "dependencies": {}
+  "dependencies": {
+    "bitcoinjs-lib": "^3.3.2"
+  }
 }
diff --git a/scripts/electrum.rb b/scripts/electrum.rb
new file mode 100644
index 0000000..5df5fc0
--- /dev/null
+++ b/scripts/electrum.rb
@@ -0,0 +1,8 @@
+require "btcruby"
+
+def receiving_mpk_for(parent_mpk)
+  keychain = BTC::Keychain.new(extended_key: parent_mpk)
+  keychain.derived_keychain("0").xpub
+end
+
+puts receiving_mpk_for(ARGV[0])
diff --git a/spec/lib/btc/address_generator_spec.rb b/spec/lib/btc/address_generator_spec.rb
index 859ccc5..8ac5a23 100644
--- a/spec/lib/btc/address_generator_spec.rb
+++ b/spec/lib/btc/address_generator_spec.rb
@@ -76,20 +76,25 @@ module Btc
       end
 
       context "multiple extended keys" do
-        let(:generator) do
-          described_class.new(xpub: xpub, signatures_required: 2)
-        end
         let(:xpub) do
-          [
-            "xpub6DY7Fqdz98GSsFDN96Levia3PwnREqhFER5RtKwiwrDzBJpEtGX5VcZdPrLgJriUfStunLmWYxrHM6XPygEJhrXZGrVh1fVZc2AQkAVPf9n",
-            "xpub6DfZs3n92pxJ3LCBf7bfgbyrECteT8PWmee5UpZhG1aBurdF5t1Tu2jxdnCBXETztHu6YkJ8Hin8t8qwPsh3YScNX3dLxduNSaevLF3KLpq",
-            "xpub6FFgmnaotx9GP3XkdK8oS8j3ExWBXXGdJ5LeWYmCHUAppaG85HPm4QRGrtowZJfwzDqjKkp1kc5mzUwa2W1PEicuynzC45myaa4vVG7bNJy",
+          # These are from Electrum
+          mpks = [
+            "xpub6D4K8Hb6sMZwwtbk6p94RnRewTb6PykJc1zZwB3GUozGSNXLnTdL2T8uXRehiD9d5Dis3bDpJCvR3pFZcYUu2xpPj5Z73oFNUUQKwkFTewo",
+            "xpub661MyMwAqRbcGHY2QrfyiUyvSv93zCQN8Cv3eXFB3ivnq7SQ6TLUJueJnGZKR8r8CQ5cLsGrr9D71uwAW9RLKqFyUybARtbbqg1kiHopBsZ",
           ]
+          # but since we want the xpub of the receiving chain and not change
+          # chain...
+          mpks.map do |mpk|
+            BTC::Keychain.new(extended_key: mpk).derived_keychain("0").xpub
+          end
+        end
+        let(:generator) do
+          described_class.new(xpub: xpub, signatures_required: 1)
         end
 
         it "generates an address at the given index for the required number of signatures" do
-          expect(generator.address(0)).to eq "397Zemr1wRy3hznQBsdQeeu1d8U5M1HrTZ"
-          expect(generator.address(18)).to eq "3GAGdkU6awG9aiDyiyrmrjvo8tpHbab5Ff"
+          expect(generator.address(0)).to eq "3GbE5Hn5NNfAbkk33AquoZqtoehkDDBEZn"
+          expect(generator.address(18)).to eq "3CwgJ7iYBWufLpwgsGKikjEH5YL38CAfz3"
         end
       end
     end
diff --git a/spec/services/btc/addresses/creation/gen_address_spec.rb b/spec/services/btc/addresses/creation/gen_address_spec.rb
index 4ae9a58..4f465ed 100644
--- a/spec/services/btc/addresses/creation/gen_address_spec.rb
+++ b/spec/services/btc/addresses/creation/gen_address_spec.rb
@@ -6,21 +6,26 @@ module Creation
       RSpec.describe GenAddress do
 
         let(:master_public_key) do
-          [
-            "xpub6DY7Fqdz98GSsFDN96Levia3PwnREqhFER5RtKwiwrDzBJpEtGX5VcZdPrLgJriUfStunLmWYxrHM6XPygEJhrXZGrVh1fVZc2AQkAVPf9n",
-            "xpub6DfZs3n92pxJ3LCBf7bfgbyrECteT8PWmee5UpZhG1aBurdF5t1Tu2jxdnCBXETztHu6YkJ8Hin8t8qwPsh3YScNX3dLxduNSaevLF3KLpq",
-            "xpub6FFgmnaotx9GP3XkdK8oS8j3ExWBXXGdJ5LeWYmCHUAppaG85HPm4QRGrtowZJfwzDqjKkp1kc5mzUwa2W1PEicuynzC45myaa4vVG7bNJy",
+          # These are from Electrum
+          # chain...
+          mpks = [
+            "xpub6D4K8Hb6sMZwwtbk6p94RnRewTb6PykJc1zZwB3GUozGSNXLnTdL2T8uXRehiD9d5Dis3bDpJCvR3pFZcYUu2xpPj5Z73oFNUUQKwkFTewo",
+            "xpub661MyMwAqRbcGHY2QrfyiUyvSv93zCQN8Cv3eXFB3ivnq7SQ6TLUJueJnGZKR8r8CQ5cLsGrr9D71uwAW9RLKqFyUybARtbbqg1kiHopBsZ",
           ]
+          # but since we want the xpub of the receiving chain...
+          mpks.map do |mpk|
+            BTC::Keychain.new(extended_key: mpk).derived_keychain("0").xpub
+          end
         end
-        let(:address_18) { "3GAGdkU6awG9aiDyiyrmrjvo8tpHbab5Ff" }
+        let(:address_1) { "3Dur7FTopK9jAUNSmLyGggMQc1nsnL2Cv6" }
 
         it "generates an address based on the keychain[address_index]" do
           resulting_ctx = described_class.execute(
             master_public_key: master_public_key,
-            signatures_required: 2,
-            address_index: 18,
+            signatures_required: 1,
+            address_index: 1,
           )
-          expect(resulting_ctx.public_address).to eq address_18
+          expect(resulting_ctx.public_address).to eq address_1
         end
 
       end
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..7480ee3
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,163 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+base-x@^3.0.2:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/base-x/-/base-x-3.0.4.tgz#94c1788736da065edb1d68808869e357c977fa77"
+  dependencies:
+    safe-buffer "^5.0.1"
+
+bech32@^1.1.2:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/bech32/-/bech32-1.1.3.tgz#bd47a8986bbb3eec34a56a097a84b8d3e9a2dfcd"
+
+bigi@^1.1.0, bigi@^1.4.0:
+  version "1.4.2"
+  resolved "https://registry.yarnpkg.com/bigi/-/bigi-1.4.2.tgz#9c665a95f88b8b08fc05cfd731f561859d725825"
+
+bip66@^1.1.0:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/bip66/-/bip66-1.1.5.tgz#01fa8748785ca70955d5011217d1b3139969ca22"
+  dependencies:
+    safe-buffer "^5.0.1"
+
+bitcoin-ops@^1.3.0:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/bitcoin-ops/-/bitcoin-ops-1.4.1.tgz#e45de620398e22fd4ca6023de43974ff42240278"
+
+bitcoinjs-lib@^3.3.2:
+  version "3.3.2"
+  resolved "https://registry.yarnpkg.com/bitcoinjs-lib/-/bitcoinjs-lib-3.3.2.tgz#780c9c53ecb1222adb463b58bef26386067b609a"
+  dependencies:
+    bech32 "^1.1.2"
+    bigi "^1.4.0"
+    bip66 "^1.1.0"
+    bitcoin-ops "^1.3.0"
+    bs58check "^2.0.0"
+    create-hash "^1.1.0"
+    create-hmac "^1.1.3"
+    ecurve "^1.0.0"
+    merkle-lib "^2.0.10"
+    pushdata-bitcoin "^1.0.1"
+    randombytes "^2.0.1"
+    safe-buffer "^5.0.1"
+    typeforce "^1.11.3"
+    varuint-bitcoin "^1.0.4"
+    wif "^2.0.1"
+
+bs58@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/bs58/-/bs58-4.0.1.tgz#be161e76c354f6f788ae4071f63f34e8c4f0a42a"
+  dependencies:
+    base-x "^3.0.2"
+
+bs58check@<3.0.0, bs58check@^2.0.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/bs58check/-/bs58check-2.1.1.tgz#8a5d0e587af97b784bf9cbf1b29f454d82bc0222"
+  dependencies:
+    bs58 "^4.0.0"
+    create-hash "^1.1.0"
+
+cipher-base@^1.0.1, cipher-base@^1.0.3:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/cipher-base/-/cipher-base-1.0.4.tgz#8760e4ecc272f4c363532f926d874aae2c1397de"
+  dependencies:
+    inherits "^2.0.1"
+    safe-buffer "^5.0.1"
+
+create-hash@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/create-hash/-/create-hash-1.2.0.tgz#889078af11a63756bcfb59bd221996be3a9ef196"
+  dependencies:
+    cipher-base "^1.0.1"
+    inherits "^2.0.1"
+    md5.js "^1.3.4"
+    ripemd160 "^2.0.1"
+    sha.js "^2.4.0"
+
+create-hmac@^1.1.3:
+  version "1.1.7"
+  resolved "https://registry.yarnpkg.com/create-hmac/-/create-hmac-1.1.7.tgz#69170c78b3ab957147b2b8b04572e47ead2243ff"
+  dependencies:
+    cipher-base "^1.0.3"
+    create-hash "^1.1.0"
+    inherits "^2.0.1"
+    ripemd160 "^2.0.0"
+    safe-buffer "^5.0.1"
+    sha.js "^2.4.8"
+
+ecurve@^1.0.0:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/ecurve/-/ecurve-1.0.6.tgz#dfdabbb7149f8d8b78816be5a7d5b83fcf6de797"
+  dependencies:
+    bigi "^1.1.0"
+    safe-buffer "^5.0.1"
+
+hash-base@^3.0.0:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/hash-base/-/hash-base-3.0.4.tgz#5fc8686847ecd73499403319a6b0a3f3f6ae4918"
+  dependencies:
+    inherits "^2.0.1"
+    safe-buffer "^5.0.1"
+
+inherits@^2.0.1:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+
+md5.js@^1.3.4:
+  version "1.3.4"
+  resolved "https://registry.yarnpkg.com/md5.js/-/md5.js-1.3.4.tgz#e9bdbde94a20a5ac18b04340fc5764d5b09d901d"
+  dependencies:
+    hash-base "^3.0.0"
+    inherits "^2.0.1"
+
+merkle-lib@^2.0.10:
+  version "2.0.10"
+  resolved "https://registry.yarnpkg.com/merkle-lib/-/merkle-lib-2.0.10.tgz#82b8dbae75e27a7785388b73f9d7725d0f6f3326"
+
+pushdata-bitcoin@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/pushdata-bitcoin/-/pushdata-bitcoin-1.0.1.tgz#15931d3cd967ade52206f523aa7331aef7d43af7"
+  dependencies:
+    bitcoin-ops "^1.3.0"
+
+randombytes@^2.0.1:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.0.6.tgz#d302c522948588848a8d300c932b44c24231da80"
+  dependencies:
+    safe-buffer "^5.1.0"
+
+ripemd160@^2.0.0, ripemd160@^2.0.1:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/ripemd160/-/ripemd160-2.0.2.tgz#a1c1a6f624751577ba5d07914cbc92850585890c"
+  dependencies:
+    hash-base "^3.0.0"
+    inherits "^2.0.1"
+
+safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1:
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
+
+sha.js@^2.4.0, sha.js@^2.4.8:
+  version "2.4.11"
+  resolved "https://registry.yarnpkg.com/sha.js/-/sha.js-2.4.11.tgz#37a5cf0b81ecbc6943de109ba2960d1b26584ae7"
+  dependencies:
+    inherits "^2.0.1"
+    safe-buffer "^5.0.1"
+
+typeforce@^1.11.3:
+  version "1.12.0"
+  resolved "https://registry.yarnpkg.com/typeforce/-/typeforce-1.12.0.tgz#ca40899919f1466d7819e37be039406beb912a2e"
+
+varuint-bitcoin@^1.0.4:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/varuint-bitcoin/-/varuint-bitcoin-1.1.0.tgz#7a343f50537607af6a3059312b9782a170894540"
+  dependencies:
+    safe-buffer "^5.1.1"
+
+wif@^2.0.1:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/wif/-/wif-2.0.6.tgz#08d3f52056c66679299726fade0d432ae74b4704"
+  dependencies:
+    bs58check "<3.0.0"