diff --git a/src/main/java/com/sparrowwallet/drongo/Utils.java b/src/main/java/com/sparrowwallet/drongo/Utils.java
index a53c7f2..3d3cbc5 100644
--- a/src/main/java/com/sparrowwallet/drongo/Utils.java
+++ b/src/main/java/com/sparrowwallet/drongo/Utils.java
@@ -5,6 +5,7 @@ import com.sparrowwallet.drongo.protocol.ProtocolException;
 import com.sparrowwallet.drongo.protocol.Ripemd160;
 import com.sparrowwallet.drongo.protocol.Sha256Hash;
 import org.bouncycastle.crypto.digests.SHA512Digest;
+import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator;
 import org.bouncycastle.crypto.macs.HMac;
 import org.bouncycastle.crypto.params.KeyParameter;
 
@@ -264,14 +265,18 @@ public class Utils {
         return Collections.unmodifiableList(childPath);
     }
 
-    static HMac createHmacSha512Digest(byte[] key) {
+    public static byte[] getHmacSha512Hash(byte[] key, byte[] data) {
+        return getHmacSha512Hash(createHmacSha512Digest(key), data);
+    }
+
+    private static HMac createHmacSha512Digest(byte[] key) {
         SHA512Digest digest = new SHA512Digest();
         HMac hMac = new HMac(digest);
         hMac.init(new KeyParameter(key));
         return hMac;
     }
 
-    public static byte[] hmacSha512(HMac hmacSha512, byte[] input) {
+    private static byte[] getHmacSha512Hash(HMac hmacSha512, byte[] input) {
         hmacSha512.reset();
         hmacSha512.update(input, 0, input.length);
         byte[] out = new byte[64];
@@ -279,7 +284,9 @@ public class Utils {
         return out;
     }
 
-    public static byte[] hmacSha512(byte[] key, byte[] data) {
-        return hmacSha512(createHmacSha512Digest(key), data);
+    public static byte[] getPbkdf2HmacSha512Hash(byte[] preimage, byte[] salt, int iterationCount) {
+        PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(new SHA512Digest());
+        gen.init(preimage, salt, iterationCount);
+        return ((KeyParameter) gen.generateDerivedParameters(512)).getKey();
     }
 }
diff --git a/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java b/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java
index f4f678a..7f7fad9 100644
--- a/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java
+++ b/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java
@@ -621,9 +621,7 @@ public class ECKey {
     }
 
     public static ECKey createKeyPbkdf2HmacSha512(String password, byte[] salt, int iterationCount) {
-        PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(new SHA512Digest());
-        gen.init(password.getBytes(StandardCharsets.UTF_8), salt, iterationCount);
-        byte[] secret = ((KeyParameter) gen.generateDerivedParameters(512)).getKey();
+        byte[] secret = Utils.getPbkdf2HmacSha512Hash(password.getBytes(StandardCharsets.UTF_8), salt, iterationCount);
         return ECKey.fromPrivate(secret);
     }
 
diff --git a/src/main/java/com/sparrowwallet/drongo/crypto/HDKeyDerivation.java b/src/main/java/com/sparrowwallet/drongo/crypto/HDKeyDerivation.java
index ed8b0f2..617b7e0 100644
--- a/src/main/java/com/sparrowwallet/drongo/crypto/HDKeyDerivation.java
+++ b/src/main/java/com/sparrowwallet/drongo/crypto/HDKeyDerivation.java
@@ -26,7 +26,7 @@ public class HDKeyDerivation {
         ByteBuffer data = ByteBuffer.allocate(37);
         data.put(parentPublicKey);
         data.putInt(childNumber.i());
-        byte[] i = Utils.hmacSha512(parent.getChainCode(), data.array());
+        byte[] i = Utils.getHmacSha512Hash(parent.getChainCode(), data.array());
         if(i.length != 64) {
             throw new IllegalStateException("HmacSHA512 output must be 64 bytes, is" + i.length);
         }
diff --git a/src/main/java/com/sparrowwallet/drongo/wallet/Bip39.java b/src/main/java/com/sparrowwallet/drongo/wallet/Bip39.java
new file mode 100644
index 0000000..309c4a3
--- /dev/null
+++ b/src/main/java/com/sparrowwallet/drongo/wallet/Bip39.java
@@ -0,0 +1,103 @@
+package com.sparrowwallet.drongo.wallet;
+
+import com.sparrowwallet.drongo.Utils;
+import com.sparrowwallet.drongo.protocol.Sha256Hash;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.text.Normalizer;
+import java.util.*;
+
+public class Bip39 {
+    private Map<String, Integer> wordlistIndex;
+
+    public byte[] getSeed(List<String> mnemonicWords, String passphrase) {
+        loadWordlistIndex();
+
+        int concatLength = mnemonicWords.size() * 11;
+        StringBuilder concat = new StringBuilder();
+        for(String mnemonicWord : mnemonicWords) {
+            Integer index = wordlistIndex.get(mnemonicWord);
+            if (index == null) {
+                throw new IllegalArgumentException("Provided mnemonic word \"" + mnemonicWord + "\" is not in the BIP39 english word list");
+            }
+
+            String binaryIndex = addLeadingZeros(Integer.toBinaryString(index), 11);
+            concat.append(binaryIndex, 0, 11);
+        }
+
+        int checksumLength = concatLength / 33;
+        int entropyLength = concatLength - checksumLength;
+        byte[] entropy = byteArrayFromBinaryString(concat.substring(0, entropyLength));
+        String providedChecksum = concat.substring(entropyLength);
+
+        byte[] sha256 = Sha256Hash.hash(entropy);
+        String calculatedChecksum = addLeadingZeros(Integer.toBinaryString(Byte.toUnsignedInt(sha256[0])), 8).substring(0, checksumLength);
+
+        if(!providedChecksum.equals(calculatedChecksum)) {
+            throw new IllegalArgumentException("Provided mnemonic words do not represent a valid BIP39 seed: checksum failed");
+        }
+
+        String saltStr = "mnemonic";
+        if(passphrase != null) {
+            saltStr += Normalizer.normalize(passphrase, Normalizer.Form.NFKD);
+        }
+        byte[] salt = saltStr.getBytes(StandardCharsets.UTF_8);
+
+        String mnemonic = String.join(" ", mnemonicWords);
+        mnemonic = Normalizer.normalize(mnemonic, Normalizer.Form.NFKD);
+
+        return Utils.getPbkdf2HmacSha512Hash(mnemonic.getBytes(StandardCharsets.UTF_8), salt, 2048);
+    }
+
+    public String addLeadingZeros(String s, int length) {
+        if (s.length() >= length) return s;
+        else return String.format("%0" + (length-s.length()) + "d%s", 0, s);
+    }
+
+    private byte[] byteArrayFromBinaryString(String binaryString) {
+        int splitSize = 8;
+
+        if(binaryString.length() < splitSize) {
+            binaryString = addLeadingZeros(binaryString, 8);
+        }
+
+        if(binaryString.length() % splitSize == 0){
+            int index = 0;
+            int position = 0;
+
+            byte[] resultByteArray = new byte[binaryString.length()/splitSize];
+            StringBuilder text = new StringBuilder(binaryString);
+
+            while (index < text.length()) {
+                String binaryStringChunk = text.substring(index, Math.min(index + splitSize, text.length()));
+                int byteAsInt = Integer.parseInt(binaryStringChunk, 2);
+                resultByteArray[position] = (byte)byteAsInt;
+                index += splitSize;
+                position ++;
+            }
+            return resultByteArray;
+        }
+        else {
+            throw new IllegalArgumentException("Cannot convert binary string to byte[], because of the input length '" + binaryString + "' % 8 != 0");
+        }
+    }
+
+    private void loadWordlistIndex() {
+        if(wordlistIndex == null) {
+            wordlistIndex = new HashMap<>();
+
+            try{
+                BufferedReader reader = new BufferedReader(new InputStreamReader(this.getClass().getResourceAsStream("/wordlist/bip39-english.txt"), StandardCharsets.UTF_8));
+                String line;
+                for(int i = 0; (line = reader.readLine()) != null; i++) {
+                    wordlistIndex.put(line.trim(), i);
+                }
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+}
diff --git a/src/main/resources/wordlist/bip39-english.txt b/src/main/resources/wordlist/bip39-english.txt
new file mode 100644
index 0000000..942040e
--- /dev/null
+++ b/src/main/resources/wordlist/bip39-english.txt
@@ -0,0 +1,2048 @@
+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
+ready
+real
+reason
+rebel
+rebuild
+recall
+receive
+recipe
+record
+recycle
+reduce
+reflect
+reform
+refuse
+region
+regret
+regular
+reject
+relax
+release
+relief
+rely
+remain
+remember
+remind
+remove
+render
+renew
+rent
+reopen
+repair
+repeat
+replace
+report
+require
+rescue
+resemble
+resist
+resource
+response
+result
+retire
+retreat
+return
+reunion
+reveal
+review
+reward
+rhythm
+rib
+ribbon
+rice
+rich
+ride
+ridge
+rifle
+right
+rigid
+ring
+riot
+ripple
+risk
+ritual
+rival
+river
+road
+roast
+robot
+robust
+rocket
+romance
+roof
+rookie
+room
+rose
+rotate
+rough
+round
+route
+royal
+rubber
+rude
+rug
+rule
+run
+runway
+rural
+sad
+saddle
+sadness
+safe
+sail
+salad
+salmon
+salon
+salt
+salute
+same
+sample
+sand
+satisfy
+satoshi
+sauce
+sausage
+save
+say
+scale
+scan
+scare
+scatter
+scene
+scheme
+school
+science
+scissors
+scorpion
+scout
+scrap
+screen
+script
+scrub
+sea
+search
+season
+seat
+second
+secret
+section
+security
+seed
+seek
+segment
+select
+sell
+seminar
+senior
+sense
+sentence
+series
+service
+session
+settle
+setup
+seven
+shadow
+shaft
+shallow
+share
+shed
+shell
+sheriff
+shield
+shift
+shine
+ship
+shiver
+shock
+shoe
+shoot
+shop
+short
+shoulder
+shove
+shrimp
+shrug
+shuffle
+shy
+sibling
+sick
+side
+siege
+sight
+sign
+silent
+silk
+silly
+silver
+similar
+simple
+since
+sing
+siren
+sister
+situate
+six
+size
+skate
+sketch
+ski
+skill
+skin
+skirt
+skull
+slab
+slam
+sleep
+slender
+slice
+slide
+slight
+slim
+slogan
+slot
+slow
+slush
+small
+smart
+smile
+smoke
+smooth
+snack
+snake
+snap
+sniff
+snow
+soap
+soccer
+social
+sock
+soda
+soft
+solar
+soldier
+solid
+solution
+solve
+someone
+song
+soon
+sorry
+sort
+soul
+sound
+soup
+source
+south
+space
+spare
+spatial
+spawn
+speak
+special
+speed
+spell
+spend
+sphere
+spice
+spider
+spike
+spin
+spirit
+split
+spoil
+sponsor
+spoon
+sport
+spot
+spray
+spread
+spring
+spy
+square
+squeeze
+squirrel
+stable
+stadium
+staff
+stage
+stairs
+stamp
+stand
+start
+state
+stay
+steak
+steel
+stem
+step
+stereo
+stick
+still
+sting
+stock
+stomach
+stone
+stool
+story
+stove
+strategy
+street
+strike
+strong
+struggle
+student
+stuff
+stumble
+style
+subject
+submit
+subway
+success
+such
+sudden
+suffer
+sugar
+suggest
+suit
+summer
+sun
+sunny
+sunset
+super
+supply
+supreme
+sure
+surface
+surge
+surprise
+surround
+survey
+suspect
+sustain
+swallow
+swamp
+swap
+swarm
+swear
+sweet
+swift
+swim
+swing
+switch
+sword
+symbol
+symptom
+syrup
+system
+table
+tackle
+tag
+tail
+talent
+talk
+tank
+tape
+target
+task
+taste
+tattoo
+taxi
+teach
+team
+tell
+ten
+tenant
+tennis
+tent
+term
+test
+text
+thank
+that
+theme
+then
+theory
+there
+they
+thing
+this
+thought
+three
+thrive
+throw
+thumb
+thunder
+ticket
+tide
+tiger
+tilt
+timber
+time
+tiny
+tip
+tired
+tissue
+title
+toast
+tobacco
+today
+toddler
+toe
+together
+toilet
+token
+tomato
+tomorrow
+tone
+tongue
+tonight
+tool
+tooth
+top
+topic
+topple
+torch
+tornado
+tortoise
+toss
+total
+tourist
+toward
+tower
+town
+toy
+track
+trade
+traffic
+tragic
+train
+transfer
+trap
+trash
+travel
+tray
+treat
+tree
+trend
+trial
+tribe
+trick
+trigger
+trim
+trip
+trophy
+trouble
+truck
+true
+truly
+trumpet
+trust
+truth
+try
+tube
+tuition
+tumble
+tuna
+tunnel
+turkey
+turn
+turtle
+twelve
+twenty
+twice
+twin
+twist
+two
+type
+typical
+ugly
+umbrella
+unable
+unaware
+uncle
+uncover
+under
+undo
+unfair
+unfold
+unhappy
+uniform
+unique
+unit
+universe
+unknown
+unlock
+until
+unusual
+unveil
+update
+upgrade
+uphold
+upon
+upper
+upset
+urban
+urge
+usage
+use
+used
+useful
+useless
+usual
+utility
+vacant
+vacuum
+vague
+valid
+valley
+valve
+van
+vanish
+vapor
+various
+vast
+vault
+vehicle
+velvet
+vendor
+venture
+venue
+verb
+verify
+version
+very
+vessel
+veteran
+viable
+vibrant
+vicious
+victory
+video
+view
+village
+vintage
+violin
+virtual
+virus
+visa
+visit
+visual
+vital
+vivid
+vocal
+voice
+void
+volcano
+volume
+vote
+voyage
+wage
+wagon
+wait
+walk
+wall
+walnut
+want
+warfare
+warm
+warrior
+wash
+wasp
+waste
+water
+wave
+way
+wealth
+weapon
+wear
+weasel
+weather
+web
+wedding
+weekend
+weird
+welcome
+west
+wet
+whale
+what
+wheat
+wheel
+when
+where
+whip
+whisper
+wide
+width
+wife
+wild
+will
+win
+window
+wine
+wing
+wink
+winner
+winter
+wire
+wisdom
+wise
+wish
+witness
+wolf
+woman
+wonder
+wood
+wool
+word
+work
+world
+worry
+worth
+wrap
+wreck
+wrestle
+wrist
+write
+wrong
+yard
+year
+yellow
+you
+young
+youth
+zebra
+zero
+zone
+zoo
diff --git a/src/test/java/com/sparrowwallet/drongo/wallet/Bip39Test.java b/src/test/java/com/sparrowwallet/drongo/wallet/Bip39Test.java
new file mode 100644
index 0000000..4db6799
--- /dev/null
+++ b/src/test/java/com/sparrowwallet/drongo/wallet/Bip39Test.java
@@ -0,0 +1,87 @@
+package com.sparrowwallet.drongo.wallet;
+
+import com.sparrowwallet.drongo.Utils;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class Bip39Test {
+    @Test
+    public void bip39TwelveWordsTest() {
+        String words = "absent essay fox snake vast pumpkin height crouch silent bulb excuse razor";
+        List<String> wordlist = Arrays.asList(words.split(" "));
+
+        Bip39 bip39 = new Bip39();
+        byte[] seed = bip39.getSeed(wordlist, "");
+
+        Assert.assertEquals("727ecfcf0bce9d8ec0ef066f7aeb845c271bdd4ee06a37398cebd40dc810140bb620b6c10a8ad671afdceaf37aa55d92d6478f747e8b92430dd938ab5be961dd", Utils.bytesToHex(seed));
+    }
+
+    @Test
+    public void bip39TwelveWordsPassphraseTest() {
+        String words = "arch easily near social civil image seminar monkey engine party promote turtle";
+        List<String> wordlist = Arrays.asList(words.split(" "));
+
+        Bip39 bip39 = new Bip39();
+        byte[] seed = bip39.getSeed(wordlist, "anotherpass867");
+
+        Assert.assertEquals("ca50764cda44a2cf52aef3c677bebf26011f9dc2b9fddfed2a8a5a9ecb8542956990a16e6873b7724044e83708d9d3a662b765e8800e6e79b289f51c2bcad756", Utils.bytesToHex(seed));
+    }
+
+    @Test
+    public void bip39FifteenWordsTest() {
+        String words = "open grunt omit snap behave inch engine hamster hope increase exotic segment news choose roast";
+        List<String> wordlist = Arrays.asList(words.split(" "));
+
+        Bip39 bip39 = new Bip39();
+        byte[] seed = bip39.getSeed(wordlist, "");
+
+        Assert.assertEquals("2174deae5fd315253dc065db7ef97f46957eb68a12505adccfb7f8aca5b63788c587e73430848f85417d9a7d95e6396d2eb3af73c9fb507ebcb9268a5ad47885", Utils.bytesToHex(seed));
+    }
+
+    @Test
+    public void bip39EighteenWordsTest() {
+        String words = "mandate lend daring actual health dilemma throw muffin garden pony inherit volume slim visual police supreme bless crush";
+        List<String> wordlist = Arrays.asList(words.split(" "));
+
+        Bip39 bip39 = new Bip39();
+        byte[] seed = bip39.getSeed(wordlist, "");
+
+        Assert.assertEquals("04bd65f582e288bbf595213048b06e1552017776d20ca290ac06d840e197bcaaccd4a85a45a41219be4183dd2e521e7a7a2d6aea3069f04e503ef6d9c8dfa651", Utils.bytesToHex(seed));
+    }
+
+    @Test
+    public void bip39TwentyOneWordsTest() {
+        String words = "mirror milk file hope drill conduct empty mutual physical easily sell patient green final release excuse name asset update advance resource";
+        List<String> wordlist = Arrays.asList(words.split(" "));
+
+        Bip39 bip39 = new Bip39();
+        byte[] seed = bip39.getSeed(wordlist, "");
+
+        Assert.assertEquals("f3a88a437153333f9759f323dfe7910e6a649c34da5800e6c978d77baad54b67b06eab17c0107243f3e8b395a2de98c910e9528127539efda2eea5ae50e94019", Utils.bytesToHex(seed));
+    }
+
+    @Test
+    public void bip39TwentyFourWordsTest() {
+        String words = "earth easily dwarf dance forum muscle brick often huge base long steel silk frost quiz liquid echo adapt annual expand slim rookie venture oval";
+        List<String> wordlist = Arrays.asList(words.split(" "));
+
+        Bip39 bip39 = new Bip39();
+        byte[] seed = bip39.getSeed(wordlist, "");
+
+        Assert.assertEquals("60f825219a1fcfa479de28435e9bf2aa5734e212982daee582ca0427ad6141c65be9863c3ce0f18e2b173083ea49dcf47d07148734a5f748ac60d470cee6a2bc", Utils.bytesToHex(seed));
+    }
+
+    @Test
+    public void bip39TwentyFourWordsPassphraseTest() {
+        String words = "earth easily dwarf dance forum muscle brick often huge base long steel silk frost quiz liquid echo adapt annual expand slim rookie venture oval";
+        List<String> wordlist = Arrays.asList(words.split(" "));
+
+        Bip39 bip39 = new Bip39();
+        byte[] seed = bip39.getSeed(wordlist, "thispass");
+
+        Assert.assertEquals("a652d123f421f56257391af26063e900619678b552dafd3850e699f6da0667269bbcaebb0509557481db29607caac0294b3cd337d740174cfa05f552fe9e0272", Utils.bytesToHex(seed));
+    }
+}