Possibility of BIP39 Electrum Seed in Counterwallet

Counterwallet uses a different dictionary than BIP39.

The CW dictionary consists of 1626 words where any 12 word combo is a valid passphrase.

BIP39 has a 2048 word list where a valid 12 word seedphrase must pass a checksum test. AFAIK Electrum uses a subset of these seedphrases.

What’s interesting for our purpose is that CW can continue using its default format AND allow the option of logging in with a BIP39 phrase.

It can check the login for a CW passphrase as normal. If it fails, check if valid BIP39.

The only thing that theoretically can go wrong is that a valid BIP39 phrase is mistaken for a CW but I did the math and the probability is just 0.003%, i.e. negligible.

Calculations here:

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Arrays</h2>

<p id="demo"></p>

<script>
var bip39 = [
"abandon",
"ability",
"able",
"about",
"above",
"absent",
"absorb",
"abstract",
"absurd",
"abuse",
"access",
"accident",
"account",
"accuse",
"achieve",
"acid",
"acoustic",
"acquire",
"across",
"act",
"action",
"actor",
"actress",
"actual",
"adapt",
"add",
"addict",
"address",
"adjust",
"admit",
"adult",
"advance",
"advice",
"aerobic",
"affair",
"afford",
"afraid",
"again",
"age",
"agent",
"agree",
"ahead",
"aim",
"air",
"airport",
"aisle",
"alarm",
"album",
"alcohol",
"alert",
"alien",
"all",
"alley",
"allow",
"almost",
"alone",
"alpha",
"already",
"also",
"alter",
"always",
"amateur",
"amazing",
"among",
"amount",
"amused",
"analyst",
"anchor",
"ancient",
"anger",
"angle",
"angry",
"animal",
"ankle",
"announce",
"annual",
"another",
"answer",
"antenna",
"antique",
"anxiety",
"any",
"apart",
"apology",
"appear",
"apple",
"approve",
"april",
"arch",
"arctic",
"area",
"arena",
"argue",
"arm",
"armed",
"armor",
"army",
"around",
"arrange",
"arrest",
"arrive",
"arrow",
"art",
"artefact",
"artist",
"artwork",
"ask",
"aspect",
"assault",
"asset",
"assist",
"assume",
"asthma",
"athlete",
"atom",
"attack",
"attend",
"attitude",
"attract",
"auction",
"audit",
"august",
"aunt",
"author",
"auto",
"autumn",
"average",
"avocado",
"avoid",
"awake",
"aware",
"away",
"awesome",
"awful",
"awkward",
"axis",
"baby",
"bachelor",
"bacon",
"badge",
"bag",
"balance",
"balcony",
"ball",
"bamboo",
"banana",
"banner",
"bar",
"barely",
"bargain",
"barrel",
"base",
"basic",
"basket",
"battle",
"beach",
"bean",
"beauty",
"because",
"become",
"beef",
"before",
"begin",
"behave",
"behind",
"believe",
"below",
"belt",
"bench",
"benefit",
"best",
"betray",
"better",
"between",
"beyond",
"bicycle",
"bid",
"bike",
"bind",
"biology",
"bird",
"birth",
"bitter",
"black",
"blade",
"blame",
"blanket",
"blast",
"bleak",
"bless",
"blind",
"blood",
"blossom",
"blouse",
"blue",
"blur",
"blush",
"board",
"boat",
"body",
"boil",
"bomb",
"bone",
"bonus",
"book",
"boost",
"border",
"boring",
"borrow",
"boss",
"bottom",
"bounce",
"box",
"boy",
"bracket",
"brain",
"brand",
"brass",
"brave",
"bread",
"breeze",
"brick",
"bridge",
"brief",
"bright",
"bring",
"brisk",
"broccoli",
"broken",
"bronze",
"broom",
"brother",
"brown",
"brush",
"bubble",
"buddy",
"budget",
"buffalo",
"build",
"bulb",
"bulk",
"bullet",
"bundle",
"bunker",
"burden",
"burger",
"burst",
"bus",
"business",
"busy",
"butter",
"buyer",
"buzz",
"cabbage",
"cabin",
"cable",
"cactus",
"cage",
"cake",
"call",
"calm",
"camera",
"camp",
"can",
"canal",
"cancel",
"candy",
"cannon",
"canoe",
"canvas",
"canyon",
"capable",
"capital",
"captain",
"car",
"carbon",
"card",
"cargo",
"carpet",
"carry",
"cart",
"case",
"cash",
"casino",
"castle",
"casual",
"cat",
"catalog",
"catch",
"category",
"cattle",
"caught",
"cause",
"caution",
"cave",
"ceiling",
"celery",
"cement",
"census",
"century",
"cereal",
"certain",
"chair",
"chalk",
"champion",
"change",
"chaos",
"chapter",
"charge",
"chase",
"chat",
"cheap",
"check",
"cheese",
"chef",
"cherry",
"chest",
"chicken",
"chief",
"child",
"chimney",
"choice",
"choose",
"chronic",
"chuckle",
"chunk",
"churn",
"cigar",
"cinnamon",
"circle",
"citizen",
"city",
"civil",
"claim",
"clap",
"clarify",
"claw",
"clay",
"clean",
"clerk",
"clever",
"click",
"client",
"cliff",
"climb",
"clinic",
"clip",
"clock",
"clog",
"close",
"cloth",
"cloud",
"clown",
"club",
"clump",
"cluster",
"clutch",
"coach",
"coast",
"coconut",
"code",
"coffee",
"coil",
"coin",
"collect",
"color",
"column",
"combine",
"come",
"comfort",
"comic",
"common",
"company",
"concert",
"conduct",
"confirm",
"congress",
"connect",
"consider",
"control",
"convince",
"cook",
"cool",
"copper",
"copy",
"coral",
"core",
"corn",
"correct",
"cost",
"cotton",
"couch",
"country",
"couple",
"course",
"cousin",
"cover",
"coyote",
"crack",
"cradle",
"craft",
"cram",
"crane",
"crash",
"crater",
"crawl",
"crazy",
"cream",
"credit",
"creek",
"crew",
"cricket",
"crime",
"crisp",
"critic",
"crop",
"cross",
"crouch",
"crowd",
"crucial",
"cruel",
"cruise",
"crumble",
"crunch",
"crush",
"cry",
"crystal",
"cube",
"culture",
"cup",
"cupboard",
"curious",
"current",
"curtain",
"curve",
"cushion",
"custom",
"cute",
"cycle",
"dad",
"damage",
"damp",
"dance",
"danger",
"daring",
"dash",
"daughter",
"dawn",
"day",
"deal",
"debate",
"debris",
"decade",
"december",
"decide",
"decline",
"decorate",
"decrease",
"deer",
"defense",
"define",
"defy",
"degree",
"delay",
"deliver",
"demand",
"demise",
"denial",
"dentist",
"deny",
"depart",
"depend",
"deposit",
"depth",
"deputy",
"derive",
"describe",
"desert",
"design",
"desk",
"despair",
"destroy",
"detail",
"detect",
"develop",
"device",
"devote",
"diagram",
"dial",
"diamond",
"diary",
"dice",
"diesel",
"diet",
"differ",
"digital",
"dignity",
"dilemma",
"dinner",
"dinosaur",
"direct",
"dirt",
"disagree",
"discover",
"disease",
"dish",
"dismiss",
"disorder",
"display",
"distance",
"divert",
"divide",
"divorce",
"dizzy",
"doctor",
"document",
"dog",
"doll",
"dolphin",
"domain",
"donate",
"donkey",
"donor",
"door",
"dose",
"double",
"dove",
"draft",
"dragon",
"drama",
"drastic",
"draw",
"dream",
"dress",
"drift",
"drill",
"drink",
"drip",
"drive",
"drop",
"drum",
"dry",
"duck",
"dumb",
"dune",
"during",
"dust",
"dutch",
"duty",
"dwarf",
"dynamic",
"eager",
"eagle",
"early",
"earn",
"earth",
"easily",
"east",
"easy",
"echo",
"ecology",
"economy",
"edge",
"edit",
"educate",
"effort",
"egg",
"eight",
"either",
"elbow",
"elder",
"electric",
"elegant",
"element",
"elephant",
"elevator",
"elite",
"else",
"embark",
"embody",
"embrace",
"emerge",
"emotion",
"employ",
"empower",
"empty",
"enable",
"enact",
"end",
"endless",
"endorse",
"enemy",
"energy",
"enforce",
"engage",
"engine",
"enhance",
"enjoy",
"enlist",
"enough",
"enrich",
"enroll",
"ensure",
"enter",
"entire",
"entry",
"envelope",
"episode",
"equal",
"equip",
"era",
"erase",
"erode",
"erosion",
"error",
"erupt",
"escape",
"essay",
"essence",
"estate",
"eternal",
"ethics",
"evidence",
"evil",
"evoke",
"evolve",
"exact",
"example",
"excess",
"exchange",
"excite",
"exclude",
"excuse",
"execute",
"exercise",
"exhaust",
"exhibit",
"exile",
"exist",
"exit",
"exotic",
"expand",
"expect",
"expire",
"explain",
"expose",
"express",
"extend",
"extra",
"eye",
"eyebrow",
"fabric",
"face",
"faculty",
"fade",
"faint",
"faith",
"fall",
"false",
"fame",
"family",
"famous",
"fan",
"fancy",
"fantasy",
"farm",
"fashion",
"fat",
"fatal",
"father",
"fatigue",
"fault",
"favorite",
"feature",
"february",
"federal",
"fee",
"feed",
"feel",
"female",
"fence",
"festival",
"fetch",
"fever",
"few",
"fiber",
"fiction",
"field",
"figure",
"file",
"film",
"filter",
"final",
"find",
"fine",
"finger",
"finish",
"fire",
"firm",
"first",
"fiscal",
"fish",
"fit",
"fitness",
"fix",
"flag",
"flame",
"flash",
"flat",
"flavor",
"flee",
"flight",
"flip",
"float",
"flock",
"floor",
"flower",
"fluid",
"flush",
"fly",
"foam",
"focus",
"fog",
"foil",
"fold",
"follow",
"food",
"foot",
"force",
"forest",
"forget",
"fork",
"fortune",
"forum",
"forward",
"fossil",
"foster",
"found",
"fox",
"fragile",
"frame",
"frequent",
"fresh",
"friend",
"fringe",
"frog",
"front",
"frost",
"frown",
"frozen",
"fruit",
"fuel",
"fun",
"funny",
"furnace",
"fury",
"future",
"gadget",
"gain",
"galaxy",
"gallery",
"game",
"gap",
"garage",
"garbage",
"garden",
"garlic",
"garment",
"gas",
"gasp",
"gate",
"gather",
"gauge",
"gaze",
"general",
"genius",
"genre",
"gentle",
"genuine",
"gesture",
"ghost",
"giant",
"gift",
"giggle",
"ginger",
"giraffe",
"girl",
"give",
"glad",
"glance",
"glare",
"glass",
"glide",
"glimpse",
"globe",
"gloom",
"glory",
"glove",
"glow",
"glue",
"goat",
"goddess",
"gold",
"good",
"goose",
"gorilla",
"gospel",
"gossip",
"govern",
"gown",
"grab",
"grace",
"grain",
"grant",
"grape",
"grass",
"gravity",
"great",
"green",
"grid",
"grief",
"grit",
"grocery",
"group",
"grow",
"grunt",
"guard",
"guess",
"guide",
"guilt",
"guitar",
"gun",
"gym",
"habit",
"hair",
"half",
"hammer",
"hamster",
"hand",
"happy",
"harbor",
"hard",
"harsh",
"harvest",
"hat",
"have",
"hawk",
"hazard",
"head",
"health",
"heart",
"heavy",
"hedgehog",
"height",
"hello",
"helmet",
"help",
"hen",
"hero",
"hidden",
"high",
"hill",
"hint",
"hip",
"hire",
"history",
"hobby",
"hockey",
"hold",
"hole",
"holiday",
"hollow",
"home",
"honey",
"hood",
"hope",
"horn",
"horror",
"horse",
"hospital",
"host",
"hotel",
"hour",
"hover",
"hub",
"huge",
"human",
"humble",
"humor",
"hundred",
"hungry",
"hunt",
"hurdle",
"hurry",
"hurt",
"husband",
"hybrid",
"ice",
"icon",
"idea",
"identify",
"idle",
"ignore",
"ill",
"illegal",
"illness",
"image",
"imitate",
"immense",
"immune",
"impact",
"impose",
"improve",
"impulse",
"inch",
"include",
"income",
"increase",
"index",
"indicate",
"indoor",
"industry",
"infant",
"inflict",
"inform",
"inhale",
"inherit",
"initial",
"inject",
"injury",
"inmate",
"inner",
"innocent",
"input",
"inquiry",
"insane",
"insect",
"inside",
"inspire",
"install",
"intact",
"interest",
"into",
"invest",
"invite",
"involve",
"iron",
"island",
"isolate",
"issue",
"item",
"ivory",
"jacket",
"jaguar",
"jar",
"jazz",
"jealous",
"jeans",
"jelly",
"jewel",
"job",
"join",
"joke",
"journey",
"joy",
"judge",
"juice",
"jump",
"jungle",
"junior",
"junk",
"just",
"kangaroo",
"keen",
"keep",
"ketchup",
"key",
"kick",
"kid",
"kidney",
"kind",
"kingdom",
"kiss",
"kit",
"kitchen",
"kite",
"kitten",
"kiwi",
"knee",
"knife",
"knock",
"know",
"lab",
"label",
"labor",
"ladder",
"lady",
"lake",
"lamp",
"language",
"laptop",
"large",
"later",
"latin",
"laugh",
"laundry",
"lava",
"law",
"lawn",
"lawsuit",
"layer",
"lazy",
"leader",
"leaf",
"learn",
"leave",
"lecture",
"left",
"leg",
"legal",
"legend",
"leisure",
"lemon",
"lend",
"length",
"lens",
"leopard",
"lesson",
"letter",
"level",
"liar",
"liberty",
"library",
"license",
"life",
"lift",
"light",
"like",
"limb",
"limit",
"link",
"lion",
"liquid",
"list",
"little",
"live",
"lizard",
"load",
"loan",
"lobster",
"local",
"lock",
"logic",
"lonely",
"long",
"loop",
"lottery",
"loud",
"lounge",
"love",
"loyal",
"lucky",
"luggage",
"lumber",
"lunar",
"lunch",
"luxury",
"lyrics",
"machine",
"mad",
"magic",
"magnet",
"maid",
"mail",
"main",
"major",
"make",
"mammal",
"man",
"manage",
"mandate",
"mango",
"mansion",
"manual",
"maple",
"marble",
"march",
"margin",
"marine",
"market",
"marriage",
"mask",
"mass",
"master",
"match",
"material",
"math",
"matrix",
"matter",
"maximum",
"maze",
"meadow",
"mean",
"measure",
"meat",
"mechanic",
"medal",
"media",
"melody",
"melt",
"member",
"memory",
"mention",
"menu",
"mercy",
"merge",
"merit",
"merry",
"mesh",
"message",
"metal",
"method",
"middle",
"midnight",
"milk",
"million",
"mimic",
"mind",
"minimum",
"minor",
"minute",
"miracle",
"mirror",
"misery",
"miss",
"mistake",
"mix",
"mixed",
"mixture",
"mobile",
"model",
"modify",
"mom",
"moment",
"monitor",
"monkey",
"monster",
"month",
"moon",
"moral",
"more",
"morning",
"mosquito",
"mother",
"motion",
"motor",
"mountain",
"mouse",
"move",
"movie",
"much",
"muffin",
"mule",
"multiply",
"muscle",
"museum",
"mushroom",
"music",
"must",
"mutual",
"myself",
"mystery",
"myth",
"naive",
"name",
"napkin",
"narrow",
"nasty",
"nation",
"nature",
"near",
"neck",
"need",
"negative",
"neglect",
"neither",
"nephew",
"nerve",
"nest",
"net",
"network",
"neutral",
"never",
"news",
"next",
"nice",
"night",
"noble",
"noise",
"nominee",
"noodle",
"normal",
"north",
"nose",
"notable",
"note",
"nothing",
"notice",
"novel",
"now",
"nuclear",
"number",
"nurse",
"nut",
"oak",
"obey",
"object",
"oblige",
"obscure",
"observe",
"obtain",
"obvious",
"occur",
"ocean",
"october",
"odor",
"off",
"offer",
"office",
"often",
"oil",
"okay",
"old",
"olive",
"olympic",
"omit",
"once",
"one",
"onion",
"online",
"only",
"open",
"opera",
"opinion",
"oppose",
"option",
"orange",
"orbit",
"orchard",
"order",
"ordinary",
"organ",
"orient",
"original",
"orphan",
"ostrich",
"other",
"outdoor",
"outer",
"output",
"outside",
"oval",
"oven",
"over",
"own",
"owner",
"oxygen",
"oyster",
"ozone",
"pact",
"paddle",
"page",
"pair",
"palace",
"palm",
"panda",
"panel",
"panic",
"panther",
"paper",
"parade",
"parent",
"park",
"parrot",
"party",
"pass",
"patch",
"path",
"patient",
"patrol",
"pattern",
"pause",
"pave",
"payment",
"peace",
"peanut",
"pear",
"peasant",
"pelican",
"pen",
"penalty",
"pencil",
"people",
"pepper",
"perfect",
"permit",
"person",
"pet",
"phone",
"photo",
"phrase",
"physical",
"piano",
"picnic",
"picture",
"piece",
"pig",
"pigeon",
"pill",
"pilot",
"pink",
"pioneer",
"pipe",
"pistol",
"pitch",
"pizza",
"place",
"planet",
"plastic",
"plate",
"play",
"please",
"pledge",
"pluck",
"plug",
"plunge",
"poem",
"poet",
"point",
"polar",
"pole",
"police",
"pond",
"pony",
"pool",
"popular",
"portion",
"position",
"possible",
"post",
"potato",
"pottery",
"poverty",
"powder",
"power",
"practice",
"praise",
"predict",
"prefer",
"prepare",
"present",
"pretty",
"prevent",
"price",
"pride",
"primary",
"print",
"priority",
"prison",
"private",
"prize",
"problem",
"process",
"produce",
"profit",
"program",
"project",
"promote",
"proof",
"property",
"prosper",
"protect",
"proud",
"provide",
"public",
"pudding",
"pull",
"pulp",
"pulse",
"pumpkin",
"punch",
"pupil",
"puppy",
"purchase",
"purity",
"purpose",
"purse",
"push",
"put",
"puzzle",
"pyramid",
"quality",
"quantum",
"quarter",
"question",
"quick",
"quit",
"quiz",
"quote",
"rabbit",
"raccoon",
"race",
"rack",
"radar",
"radio",
"rail",
"rain",
"raise",
"rally",
"ramp",
"ranch",
"random",
"range",
"rapid",
"rare",
"rate",
"rather",
"raven",
"raw",
"razor",
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1 Like

It would be interesting to also phase out the “mnemonic.js” based seeds in favor of BIP39 (as default) and in that same step use a more modern derivation path as per BIP43/44.

However, care must be taken to support old style addresses.

EDIT: Also, usage of SLIP-0044 as a de-facto standard for counterparty (and other coins) addresses should be interesting to adapt.

Can we skip straight to BIP173? ie., native segwit / bech32? P2WKPH (bc1…)