Use bitcoinjs-lib to generate addresses

app/lib/btc/address_generator.rb

@@ -24,11 +24,17 @@ 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)

lib/address_gen.js

@@ -0,0 +1,13 @@
+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)

package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "bitcoinjs-lib": "^4.0.2"
+  }
+}

spec/lib/btc/address_generator_spec.rb

@@ -93,7 +93,7 @@ module Btc
         end
 
         it "generates an address at the given index for the required number of signatures" do
-          expect(generator.address(0)).to eq "32Zt24PnJSjhgVvBKoZiyqPz26AmgUo1sV"
+          expect(generator.address(0)).to eq "3GbE5Hn5NNfAbkk33AquoZqtoehkDDBEZn"
           expect(generator.address(18)).to eq "3CwgJ7iYBWufLpwgsGKikjEH5YL38CAfz3"
         end
       end

yarn.lock

@@ -0,0 +1,259 @@
+# 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"
+  integrity sha512-UYOadoSIkEI/VrRGSG6qp93rp2WdokiAiNYDfGW5qURAY8GiAQkvMbwNNSDYiVJopqv4gCna7xqf4rrNGp+5AA==
+  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"
+  integrity sha512-yuVFUvrNcoJi0sv5phmqc6P+Fl1HjRDRNOOkHY2X/3LBy2bIGNSFx4fZ95HMaXHupuS7cZR15AsvtmCIF4UEyg==
+
+bindings@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.3.0.tgz#b346f6ecf6a95f5a815c5839fc7cdb22502f1ed7"
+  integrity sha512-DpLh5EzMR2kzvX1KIlVC0VkC3iZtHKTgdtZ0a3pglBZdaQFjt5S9g9xd1lE+YvXyfd6mtCeRnrUfOLYiTMlNSw==
+
+bip32@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/bip32/-/bip32-1.0.2.tgz#982e2ad2cae6fc6a2f53dda3e6c3be9364674b28"
+  integrity sha512-kedLYj8yvYzND+EfzeoMSlGiN7ImiRBF/MClJSZPkMfcU+OQO7ZpL5L/Yg+TunebBZIHhunstiQF//KLKSF5rg==
+  dependencies:
+    bs58check "^2.1.1"
+    create-hash "^1.2.0"
+    create-hmac "^1.1.7"
+    tiny-secp256k1 "^1.0.0"
+    typeforce "^1.11.5"
+    wif "^2.0.6"
+
+bip66@^1.1.0:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/bip66/-/bip66-1.1.5.tgz#01fa8748785ca70955d5011217d1b3139969ca22"
+  integrity sha1-AfqHSHhcpwlV1QESF9GzE5lpyiI=
+  dependencies:
+    safe-buffer "^5.0.1"
+
+bitcoin-ops@^1.3.0, bitcoin-ops@^1.4.0:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/bitcoin-ops/-/bitcoin-ops-1.4.1.tgz#e45de620398e22fd4ca6023de43974ff42240278"
+  integrity sha512-pef6gxZFztEhaE9RY9HmWVmiIHqCb2OyS4HPKkpc6CIiiOa3Qmuoylxc5P2EkU3w+5eTSifI9SEZC88idAIGow==
+
+bitcoinjs-lib@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/bitcoinjs-lib/-/bitcoinjs-lib-4.0.2.tgz#84fc9d14774c07581ad1795f2444706fc3f7a666"
+  integrity sha512-Y6AW91WPDoDQQLy4FejVoH4NvENqvMy+Q/8mnakEzckG1NXiLo0VgnEZyuvZb6lkhE2+YxzTCgpqzbnerOSpEg==
+  dependencies:
+    bech32 "^1.1.2"
+    bip32 "^1.0.0"
+    bip66 "^1.1.0"
+    bitcoin-ops "^1.4.0"
+    bs58check "^2.0.0"
+    create-hash "^1.1.0"
+    create-hmac "^1.1.3"
+    merkle-lib "^2.0.10"
+    pushdata-bitcoin "^1.0.1"
+    randombytes "^2.0.1"
+    safe-buffer "^5.1.1"
+    tiny-secp256k1 "^1.0.0"
+    typeforce "^1.11.3"
+    varuint-bitcoin "^1.0.4"
+    wif "^2.0.1"
+
+bn.js@^4.11.8, bn.js@^4.4.0:
+  version "4.11.8"
+  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.11.8.tgz#2cde09eb5ee341f484746bb0309b3253b1b1442f"
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+  resolved "https://registry.yarnpkg.com/bs58/-/bs58-4.0.1.tgz#be161e76c354f6f788ae4071f63f34e8c4f0a42a"
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+    create-hash "^1.1.0"
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+
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+  resolved "https://registry.yarnpkg.com/cipher-base/-/cipher-base-1.0.4.tgz#8760e4ecc272f4c363532f926d874aae2c1397de"
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+  dependencies:
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+  dependencies:
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+    inherits "^2.0.1"
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+    ripemd160 "^2.0.1"
+    sha.js "^2.4.0"
+
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+  resolved "https://registry.yarnpkg.com/create-hmac/-/create-hmac-1.1.7.tgz#69170c78b3ab957147b2b8b04572e47ead2243ff"
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+  dependencies:
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+    create-hash "^1.1.0"
+    inherits "^2.0.1"
+    ripemd160 "^2.0.0"
+    safe-buffer "^5.0.1"
+    sha.js "^2.4.8"
+
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+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.4.1.tgz#c2d0b7776911b86722c632c3c06c60f2f819939a"
+  integrity sha512-BsXLz5sqX8OHcsh7CqBMztyXARmGQ3LWPtGjJi6DiJHq5C/qvi9P3OqgswKSDftbu8+IoI/QDTAm2fFnQ9SZSQ==
+  dependencies:
+    bn.js "^4.4.0"
+    brorand "^1.0.1"
+    hash.js "^1.0.0"
+    hmac-drbg "^1.0.0"
+    inherits "^2.0.1"
+    minimalistic-assert "^1.0.0"
+    minimalistic-crypto-utils "^1.0.0"
+
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+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/hash-base/-/hash-base-3.0.4.tgz#5fc8686847ecd73499403319a6b0a3f3f6ae4918"
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+
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+  integrity sha1-0nRXAQJabHdabFRXk+1QL8DGSaE=
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+  dependencies:
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+    inherits "^2.0.1"
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+
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+  version "2.0.10"
+  resolved "https://registry.yarnpkg.com/merkle-lib/-/merkle-lib-2.0.10.tgz#82b8dbae75e27a7785388b73f9d7725d0f6f3326"
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+
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+  resolved "https://registry.yarnpkg.com/minimalistic-crypto-utils/-/minimalistic-crypto-utils-1.0.1.tgz#f6c00c1c0b082246e5c4d99dfb8c7c083b2b582a"
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+
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+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/pushdata-bitcoin/-/pushdata-bitcoin-1.0.1.tgz#15931d3cd967ade52206f523aa7331aef7d43af7"
+  integrity sha1-FZMdPNlnreUiBvUjqnMxrvfUOvc=
+  dependencies:
+    bitcoin-ops "^1.3.0"
+
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+
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+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/tiny-secp256k1/-/tiny-secp256k1-1.0.1.tgz#fc6f96529c22b92be91e12de4040fdd9245f7835"
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+
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+  resolved "https://registry.yarnpkg.com/varuint-bitcoin/-/varuint-bitcoin-1.1.0.tgz#7a343f50537607af6a3059312b9782a170894540"
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+  resolved "https://registry.yarnpkg.com/wif/-/wif-2.0.6.tgz#08d3f52056c66679299726fade0d432ae74b4704"
+  integrity sha1-CNP1IFbGZnkplyb63g1DKudLRwQ=
+  dependencies:
+    bs58check "<3.0.0"