diff --git a/circuits/poseidon.circom b/circuits/poseidon.circom
index b90f886..dad6806 100644
--- a/circuits/poseidon.circom
+++ b/circuits/poseidon.circom
@@ -41,119 +41,120 @@ template Mix(t, M) {
 template Poseidon(nInputs, t, nRoundsF, nRoundsP) {
 
     var C = [
-        1354025385229961744769229343273868518314335569873439558835166239576773343708,
-        14378844218625331047742339561309620904043097700980163591187076404481144585564,
-        19370813333785034372560258124535206525278124675105547990205946542330734467847,
-        19339919977375282793227987561727366424934767905100680591050582380667086628202,
-        8422275364316831706903446151602338206948363474119622730702497535467809432414,
-        7433947928146794739292515659214608949964639549664630885486968546133071892830,
-        20753350951496713264979200428833003140825588922450200809553577914404143341040,
-        21437018888080559864996889038552602698883513894753499324572098534369350747880,
-        6815447461573214810645016226370803316854141900901895816072622961504507953749,
-        11746901014017411226283657362310634990885933032228701131899561585228216986615,
-        13428722985713722660261823704226749286675766756093697029778643398137361221114,
-        10894749142018158588533110743373157663019829222177356873395009880383491602356,
-        13720066349319517776784660327982201297420012713976744204318378121767771862484,
-        4665971664531891307640113589671067488692829783046247264698659233443166028412,
-        5364541878673041196937884015923978656299860601766012213141306792903990539664,
-        1747411112078838632103476037026417344408680910500491241306123941341644055714,
-        1835035066071759522152578007305026433897204459772540871869487151042238374039,
-        21055637025200882290106914253232617255445210101773537879323245961051751183138,
-        19215142378199333594641095299020637309879189505235993967243075316794127016728,
-        5264915734761449905856538116909638235466879053604660991987579054616980096262,
-        10045917614023673044141331581538797960977704806582630277050701175565262856382,
-        7789533631025313780520004400945166898631872921910178131342071973345076732672,
-        19972498130123740615813398456152565371201412297339860820234719562997192378694,
-        14216077977931104808041453382683965630500368477063603536695472115075869912121,
-        2555981910568472028679439033700033287358333564454149464965229699417319912931,
-        11735111941739477522347883122573591136355121750109794306409399099068977659499,
-        16957890207070910233505303498878270130436461648242792271152604513138986611609,
-        358520143235124107055243451716507147499373646513864848163778795927281509793,
-        6389190271835493841487214043252929516390267871881261173336690351147926750010,
-        12939611907106878137030264379019786496625916664142697309441198804098015086205,
-        456696638239570875759108333278090964360604015255503302016190396687826618227,
-        20569764931577491771523222445135914903999292206008007769649255123342890660989,
-        3341317247281280728261320226215152668194921091152837358683334635401182164637,
-        11821224368797169892747612081573458772211068320533296007836648033607696236615,
-        2185176387193659864764608304330502180888068591409305411859725028056771843945,
-        17161758741114551704796078639849789476380746803787101178795737276111464575519,
-        11889888355183092530573415929875444766831739308191993115663429638848547668798,
-        19503084309842095729857399025417533485089330284851492085544757107759925099089,
-        20280152151768521735424910115623976684589382048161526796204268413029416266256,
-        17607351334578006856860845064970248988416315904757246948622629528628773644114,
-        20769468546336672951384440602623018830493119282829911435465737079851020547355,
-        1546429204704408801701093430086546742691081844046642451323347737810191940866,
-        11200569249561318620053458114013886527484999499632128671282997438827107108229,
-        20198213289062010915914579158889968647687156198219713083074315178786791524034,
-        12911209060630719799682705729835581341676468319742562559036843993017369855977,
-        18925188847138989248835676768641716482476141553833902070405850166412140133887,
-        20376466983584239909415025821007315251422803039634139484663713769887712746966,
-        5250536177612235431141386983455571232984126980327432803966957255414592397060,
-        344847263093423485167610155050688875010578621416939967999896518937961396680,
-        19870333728541576497318505013425518731999037041271340888970559590767369935385,
-        20604512495859902382577228682521142736989261702707317046150335692410020156250,
-        18293964088694556689667514948280720605277532123251572448395882397578643211622,
-        21211253784206079547762943120791531326787601501123474236198383850531142559075,
-        17247914781304154940895909185506123510423535554247372833321968000513811053190,
-        16432189025237084563810000088202867449333673799705533820685782829379758927490,
-        7204783063529242442830743239980168374343946353418800547956909848044774363774,
-        2108268032972510691814120801033692084861951866306906253604497017452204030001,
-        13483247063999686990721729188827693318708500027762095503921527692630827328070,
-        18194665574704709729868916970580318177272365766028499528691737819467051567534,
-        9275639092314761435364537152118796424056864859607619908791935597976913759411,
-        12700165678727983685032332532042155014245610964583614362270316386368455898604,
-        19127554193875137546212792134421555344854604853165878912238751527694270097310,
-        16817455471920423226570476063669349525676437756352144502692679769377074040335,
-        17331185397945904160678487303485263376032543419657328137924881433628614769955,
-        11605569208043267134285833752214422326246425655661043119023566733685555142420
+        14397397413755236225575615486459253198602422701513067526754101844196324375522,
+        10405129301473404666785234951972711717481302463898292859783056520670200613128,
+        5179144822360023508491245509308555580251733042407187134628755730783052214509,
+        9132640374240188374542843306219594180154739721841249568925550236430986592615,
+        20360807315276763881209958738450444293273549928693737723235350358403012458514,
+        17933600965499023212689924809448543050840131883187652471064418452962948061619,
+        3636213416533737411392076250708419981662897009810345015164671602334517041153,
+        2008540005368330234524962342006691994500273283000229509835662097352946198608,
+        16018407964853379535338740313053768402596521780991140819786560130595652651567,
+        20653139667070586705378398435856186172195806027708437373983929336015162186471,
+        17887713874711369695406927657694993484804203950786446055999405564652412116765,
+        4852706232225925756777361208698488277369799648067343227630786518486608711772,
+        8969172011633935669771678412400911310465619639756845342775631896478908389850,
+        20570199545627577691240476121888846460936245025392381957866134167601058684375,
+        16442329894745639881165035015179028112772410105963688121820543219662832524136,
+        20060625627350485876280451423010593928172611031611836167979515653463693899374,
+        16637282689940520290130302519163090147511023430395200895953984829546679599107,
+        15599196921909732993082127725908821049411366914683565306060493533569088698214,
+        16894591341213863947423904025624185991098788054337051624251730868231322135455,
+        1197934381747032348421303489683932612752526046745577259575778515005162320212,
+        6172482022646932735745595886795230725225293469762393889050804649558459236626,
+        21004037394166516054140386756510609698837211370585899203851827276330669555417,
+        15262034989144652068456967541137853724140836132717012646544737680069032573006,
+        15017690682054366744270630371095785995296470601172793770224691982518041139766,
+        15159744167842240513848638419303545693472533086570469712794583342699782519832,
+        11178069035565459212220861899558526502477231302924961773582350246646450941231,
+        21154888769130549957415912997229564077486639529994598560737238811887296922114,
+        20162517328110570500010831422938033120419484532231241180224283481905744633719,
+        2777362604871784250419758188173029886707024739806641263170345377816177052018,
+        15732290486829619144634131656503993123618032247178179298922551820261215487562,
+        6024433414579583476444635447152826813568595303270846875177844482142230009826,
+        17677827682004946431939402157761289497221048154630238117709539216286149983245,
+        10716307389353583413755237303156291454109852751296156900963208377067748518748,
+        14925386988604173087143546225719076187055229908444910452781922028996524347508,
+        8940878636401797005293482068100797531020505636124892198091491586778667442523,
+        18911747154199663060505302806894425160044925686870165583944475880789706164410,
+        8821532432394939099312235292271438180996556457308429936910969094255825456935,
+        20632576502437623790366878538516326728436616723089049415538037018093616927643,
+        71447649211767888770311304010816315780740050029903404046389165015534756512,
+        2781996465394730190470582631099299305677291329609718650018200531245670229393,
+        12441376330954323535872906380510501637773629931719508864016287320488688345525,
+        2558302139544901035700544058046419714227464650146159803703499681139469546006,
+        10087036781939179132584550273563255199577525914374285705149349445480649057058,
+        4267692623754666261749551533667592242661271409704769363166965280715887854739,
+        4945579503584457514844595640661884835097077318604083061152997449742124905548,
+        17742335354489274412669987990603079185096280484072783973732137326144230832311,
+        6266270088302506215402996795500854910256503071464802875821837403486057988208,
+        2716062168542520412498610856550519519760063668165561277991771577403400784706,
+        19118392018538203167410421493487769944462015419023083813301166096764262134232,
+        9386595745626044000666050847309903206827901310677406022353307960932745699524,
+        9121640807890366356465620448383131419933298563527245687958865317869840082266,
+        3078975275808111706229899605611544294904276390490742680006005661017864583210,
+        7157404299437167354719786626667769956233708887934477609633504801472827442743,
+        14056248655941725362944552761799461694550787028230120190862133165195793034373,
+        14124396743304355958915937804966111851843703158171757752158388556919187839849,
+        11851254356749068692552943732920045260402277343008629727465773766468466181076,
+        9799099446406796696742256539758943483211846559715874347178722060519817626047,
+        10156146186214948683880719664738535455146137901666656566575307300522957959544,
+        19908645952733301583346063785055921934459499091029406575311417879963332475861,
+        11766105336238068471342414351862472329437473380853789942065610694000443387471,
+        11002137593249972174092192767251572171769044073555430468487809799220351297047,
+        284136377911685911941431040940403846843630064858778505937392780738953624163,
+        19448733709802908339787967270452055364068697565906862913410983275341804035680,
+        14423660424692802524250720264041003098290275890428483723270346403986712981505,
+        10635360132728137321700090133109897687122647659471659996419791842933639708516
     ];
 
     var M = [
         [
-            12037235000515189726428793905458162231976011685774991261061889278958802340039,
-            15885254491685089152627111704751054604879027605518712546805347341940526552948,
-            12220682901774309471330657931458552366575439534877271150866614914170639536810,
-            11195096069395318710866553226959674457987772316145705151894647995087349332576,
-            598000700605575401177173118514166571064818339748567530524299773749024042768,
-            1430722853270801285936618367966028727146977818314178365893636191280860605092
+            19167410339349846567561662441069598364702008768579734801591448511131028229281,
+            14183033936038168803360723133013092560869148726790180682363054735190196956789,
+            9067734253445064890734144122526450279189023719890032859456830213166173619761,
+            16378664841697311562845443097199265623838619398287411428110917414833007677155,
+            12968540216479938138647596899147650021419273189336843725176422194136033835172,
+            3636162562566338420490575570584278737093584021456168183289112789616069756675
         ],[
-            2478807512283787086755520696277192042388812450777005645736937700857950416751,
-            2233078558675693495109307103888903813217767160310116996267068037131890781382,
-            18876120310576321787684235034151243856925703159922712959767164734820803570163,
-            16850806847813838898693870637445284830832219430572133120914449039176718036761,
-            1333036876405396107763619427367607232034082504897380383847654332653606615427,
-            8024813862822108072341428765418554797098705487914663416123759888639403831315
+            17034139127218860091985397764514160131253018178110701196935786874261236172431,
+            2799255644797227968811798608332314218966179365168250111693473252876996230317,
+            2482058150180648511543788012634934806465808146786082148795902594096349483974,
+            16563522740626180338295201738437974404892092704059676533096069531044355099628,
+            10468644849657689537028565510142839489302836569811003546969773105463051947124,
+            3328913364598498171733622353010907641674136720305714432354138807013088636408
         ],[
-            6500095533434910955474026763873910167129305339747639394388586826716085593160,
-            8370208895752773828195461153114215021863221486187756770286440396339432061839,
-            9303960191058819387902927958335344077259478983903385066838134730814638010892,
-            12233235273183315334651707749232602313616943260130930740801007863528547113209,
-            9140649423847813564210562288927015604065254723368331178903734405333716165919,
-            1715897011776785698388835993891828784112980527691698420841641796168725014542
+            18985203040268814769637347880759846911264240088034262814847924884273017355969,
+            8652975463545710606098548415650457376967119951977109072274595329619335974180,
+            970943815872417895015626519859542525373809485973005165410533315057253476903,
+            19406667490568134101658669326517700199745817783746545889094238643063688871948,
+            17049854690034965250221386317058877242629221002521630573756355118745574274967,
+            4964394613021008685803675656098849539153699842663541444414978877928878266244
         ],[
-            19092640119254952117901733765506685707486610088248205883870061221436629780176,
-            3099417239661426161523333446616746096617346084970490427773391639810420659748,
-            4498351799178816410443394768364090919370619407529999860500200773846156676605,
-            17766546613911504681964882079687098358108049762069064124348111606619240189874,
-            19735199036142202254810745273503942799136628866093225336283966579447096889407,
-            18618071352177331467649099054615438672487187348128402045695624605978242597928
+            19025623051770008118343718096455821045904242602531062247152770448380880817517,
+            9077319817220936628089890431129759976815127354480867310384708941479362824016,
+            4770370314098695913091200576539533727214143013236894216582648993741910829490,
+            4298564056297802123194408918029088169104276109138370115401819933600955259473,
+            6905514380186323693285869145872115273350947784558995755916362330070690839131,
+            4783343257810358393326889022942241108539824540285247795235499223017138301952
         ],[
-            13282641901514824677915134398195165361567825236648422290753355584311135817423,
-            842963276112770184096507757019973399127531993386626262873928307889423235104,
-            5724939764407712239242783736588389538981693110806985476155198757555171230777,
-            3015568820237516884743892014063659856564948150197038824747891972506031149123,
-            8926202997251578932273751544826990276848999132609774201265891812369804099098,
-            13523975980414815337318802343464374889255493007711857898760066111901192774093
+            16205238342129310687768799056463408647672389183328001070715567975181364448609,
+            8303849270045876854140023508764676765932043944545416856530551331270859502246,
+            20218246699596954048529384569730026273241102596326201163062133863539137060414,
+            1712845821388089905746651754894206522004527237615042226559791118162382909269,
+            13001155522144542028910638547179410124467185319212645031214919884423841839406,
+            16037892369576300958623292723740289861626299352695838577330319504984091062115
         ],[
-            13163705634211158833717167498904899472888572514300041636511944020589976373689,
-            6705743158328622712684686369234272301477431173971663001146157949982901448493,
-            5341285785102635724684809992160578025785996331334612975598752577556138916495,
-            2365134732811643517126128253974711531515283135672252986518431351700239265326,
-            11812366860142870031000585328436207067560705932658624313008187741187899702321,
-            11192751017231920972897699839932659451476356148115786649719660565307185769796
+            15162889384227198851506890526431746552868519326873025085114621698588781611738,
+            13272957914179340594010910867091459756043436017766464331915862093201960540910,
+            9416416589114508529880440146952102328470363729880726115521103179442988482948,
+            8035240799672199706102747147502951589635001418759394863664434079699838251138,
+            21642389080762222565487157652540372010968704000567605990102641816691459811717,
+            20261355950827657195644012399234591122288573679402601053407151083849785332516
         ]
     ];
 
+
     signal input inputs[nInputs];
     signal output out;
 
diff --git a/package-lock.json b/package-lock.json
index d7adc62..418ddf7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,9 +13,9 @@
       }
     },
     "@babel/highlight": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
-      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
       "requires": {
         "chalk": "^2.0.0",
         "esutils": "^2.0.2",
@@ -44,9 +44,9 @@
       "integrity": "sha512-QcAKpaO6nhHLlxWBvpc4WeLrTvPqlHOvaj0s5GriKkA1zq+bsFBPpfYCvQhLqLgYlIko8A9YrPdaMHCo5mBcpg=="
     },
     "acorn": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
-      "integrity": "sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA=="
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
+      "integrity": "sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw=="
     },
     "acorn-jsx": {
       "version": "5.0.1",
@@ -58,6 +58,17 @@
       "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.0.0.tgz",
       "integrity": "sha1-4h3xCtbCBTKVvLuNq0Cwnb6ofk0="
     },
+    "ajv": {
+      "version": "6.10.1",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.1.tgz",
+      "integrity": "sha512-w1YQaVGNC6t2UCPjEawK/vo/dG8OOrVtUmhBT1uJJYxbl5kU2Tj3v6LGqBcsysN1yhuCStJCCA3GqdvKY8sqXQ==",
+      "requires": {
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
     "ansi-colors": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-1.1.0.tgz",
@@ -337,9 +348,9 @@
       }
     },
     "big-integer": {
-      "version": "1.6.43",
-      "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.43.tgz",
-      "integrity": "sha512-9dULc9jsKmXl0Aeunug8wbF+58n+hQoFjqClN7WeZwGLh0XJUWyJJ9Ee+Ep+Ql/J9fRsTVaeThp8MhiCCrY0Jg=="
+      "version": "1.6.44",
+      "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.44.tgz",
+      "integrity": "sha512-7MzElZPTyJ2fNvBkPxtFQ2fWIkVmuzw41+BZHSzpEq3ymB2MfeKp1+yXl/tS75xCx+WnyV+yb0kp+K1C3UNwmQ=="
     },
     "binary-extensions": {
       "version": "1.13.1",
@@ -347,9 +358,12 @@
       "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw=="
     },
     "bindings": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.0.tgz",
-      "integrity": "sha512-DpLh5EzMR2kzvX1KIlVC0VkC3iZtHKTgdtZ0a3pglBZdaQFjt5S9g9xd1lE+YvXyfd6mtCeRnrUfOLYiTMlNSw=="
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+      "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+      "requires": {
+        "file-uri-to-path": "1.0.0"
+      }
     },
     "bip66": {
       "version": "1.1.5",
@@ -369,6 +383,23 @@
         "nan": "^2.2.1"
       }
     },
+    "blake2b": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/blake2b/-/blake2b-2.1.3.tgz",
+      "integrity": "sha512-pkDss4xFVbMb4270aCyGD3qLv92314Et+FsKzilCLxDz5DuZ2/1g3w4nmBbu6nKApPspnjG7JcwTjGZnduB1yg==",
+      "requires": {
+        "blake2b-wasm": "^1.1.0",
+        "nanoassert": "^1.0.0"
+      }
+    },
+    "blake2b-wasm": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/blake2b-wasm/-/blake2b-wasm-1.1.7.tgz",
+      "integrity": "sha512-oFIHvXhlz/DUgF0kq5B1CqxIDjIJwh9iDeUUGQUcvgiGz7Wdw03McEO7CfLBy7QKGdsydcMCgO9jFNBAFCtFcA==",
+      "requires": {
+        "nanoassert": "^1.0.0"
+      }
+    },
     "bn.js": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
@@ -693,7 +724,7 @@
     },
     "commander": {
       "version": "2.15.1",
-      "resolved": "http://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
       "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==",
       "dev": true
     },
@@ -1114,28 +1145,15 @@
         "strip-json-comments": "^2.0.1",
         "table": "^5.2.3",
         "text-table": "^0.2.0"
-      },
-      "dependencies": {
-        "ajv": {
-          "version": "6.10.0",
-          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.0.tgz",
-          "integrity": "sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==",
-          "requires": {
-            "fast-deep-equal": "^2.0.1",
-            "fast-json-stable-stringify": "^2.0.0",
-            "json-schema-traverse": "^0.4.1",
-            "uri-js": "^4.2.2"
-          }
-        }
       }
     },
     "eslint-plugin-mocha": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-mocha/-/eslint-plugin-mocha-5.2.0.tgz",
-      "integrity": "sha512-4VTX/qIoxUFRnXLNm6bEhEJyfGnGagmQzV4TWXKzkZgIYyP2FSubEdCjEFTyS/dGwSVRWCWGX7jO7BK8R0kppg==",
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-mocha/-/eslint-plugin-mocha-5.3.0.tgz",
+      "integrity": "sha512-3uwlJVLijjEmBeNyH60nzqgA1gacUWLUmcKV8PIGNvj1kwP/CTgAWQHn2ayyJVwziX+KETkr9opNwT1qD/RZ5A==",
       "dev": true,
       "requires": {
-        "ramda": "^0.25.0"
+        "ramda": "^0.26.1"
       }
     },
     "eslint-scope": {
@@ -1335,16 +1353,6 @@
         "p-finally": "^1.0.0",
         "signal-exit": "^3.0.0",
         "strip-eof": "^1.0.0"
-      },
-      "dependencies": {
-        "get-stream": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
-          "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
-          "requires": {
-            "pump": "^3.0.0"
-          }
-        }
       }
     },
     "expand-brackets": {
@@ -1605,22 +1613,12 @@
         "flatted": "^2.0.0",
         "rimraf": "2.6.3",
         "write": "1.0.3"
-      },
-      "dependencies": {
-        "rimraf": {
-          "version": "2.6.3",
-          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
-          "integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
-          "requires": {
-            "glob": "^7.1.3"
-          }
-        }
       }
     },
     "flatted": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/flatted/-/flatted-2.0.0.tgz",
-      "integrity": "sha512-R+H8IZclI8AAkSBRQJLVOsxwAoHd6WC40b4QTNWIjzAa6BXOBfQcM587MXDTVPeYaopFNWHUFLx7eNmHDSxMWg=="
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-2.0.1.tgz",
+      "integrity": "sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg=="
     },
     "flush-write-stream": {
       "version": "1.1.1",
@@ -1907,12 +1905,6 @@
           "bundled": true,
           "optional": true
         },
-        "nan": {
-          "version": "2.14.0",
-          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
-          "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==",
-          "optional": true
-        },
         "needle": {
           "version": "2.3.0",
           "bundled": true,
@@ -2560,15 +2552,23 @@
       "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
       "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE="
     },
+    "get-stream": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
+      "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
+      "requires": {
+        "pump": "^3.0.0"
+      }
+    },
     "get-value": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/get-value/-/get-value-2.0.6.tgz",
       "integrity": "sha1-3BXKHGcjh8p2vTesCjlbogQqLCg="
     },
     "glob": {
-      "version": "7.1.3",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.3.tgz",
-      "integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
+      "version": "7.1.4",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.4.tgz",
+      "integrity": "sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==",
       "requires": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
@@ -2956,9 +2956,9 @@
       "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg=="
     },
     "import-fresh": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.0.0.tgz",
-      "integrity": "sha512-pOnA9tfM3Uwics+SaBLCNyZZZbK+4PTu0OPZtLlMIrv17EdBoC15S9Kn8ckJ9TZTyKb3ywNE5y1yeDxxGA7nTQ==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.1.0.tgz",
+      "integrity": "sha512-PpuksHKGt8rXfWEr9m9EHIpgyyaltBy8+eF6GJM0QCAxMgxCfucMF3mjecK2QsJr0amJW7gTqh5/wht0z2UhEQ==",
       "requires": {
         "parent-module": "^1.0.0",
         "resolve-from": "^4.0.0"
@@ -2979,9 +2979,9 @@
       }
     },
     "inherits": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
-      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
     },
     "ini": {
       "version": "1.3.5",
@@ -2989,9 +2989,9 @@
       "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw=="
     },
     "inquirer": {
-      "version": "6.3.1",
-      "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-6.3.1.tgz",
-      "integrity": "sha512-MmL624rfkFt4TG9y/Jvmt8vdmOo836U7Y0Hxr2aFk3RelZEGX4Igk0KabWrcaaZaTv9uzglOqWh1Vly+FAWAXA==",
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-6.4.1.tgz",
+      "integrity": "sha512-/Jw+qPZx4EDYsaT6uz7F4GJRNFMRdKNeUZw3ZnKV8lyuUgz/YWRCSUAJMZSVhSq4Ec0R2oYnyi6b3d4JXcL5Nw==",
       "requires": {
         "ansi-escapes": "^3.2.0",
         "chalk": "^2.4.2",
@@ -3542,10 +3542,9 @@
       }
     },
     "minimist": {
-      "version": "0.0.10",
-      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
-      "integrity": "sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8=",
-      "dev": true
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
     },
     "mixin-deep": {
       "version": "1.3.2",
@@ -3568,17 +3567,10 @@
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "requires": {
         "minimist": "0.0.8"
-      },
-      "dependencies": {
-        "minimist": {
-          "version": "0.0.8",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
-          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
-        }
       }
     },
     "mocha": {
@@ -3641,9 +3633,9 @@
       }
     },
     "ms": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
-      "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
     "mute-stdout": {
       "version": "1.0.1",
@@ -3656,9 +3648,14 @@
       "integrity": "sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s="
     },
     "nan": {
-      "version": "2.11.1",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.11.1.tgz",
-      "integrity": "sha512-iji6k87OSXa0CcrLl9z+ZiYSuR2o+c0bGuNmXdrhTQTakxytAFsC56SArGYoiHlJlFoHSnvmhpceZJaXkVuOtA=="
+      "version": "2.14.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
+      "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg=="
+    },
+    "nanoassert": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/nanoassert/-/nanoassert-1.1.0.tgz",
+      "integrity": "sha1-TzFS4JVA/eKMdvRLGbvNHVpCR40="
     },
     "nanomatch": {
       "version": "1.2.13",
@@ -3867,6 +3864,14 @@
       "requires": {
         "minimist": "~0.0.1",
         "wordwrap": "~0.0.2"
+      },
+      "dependencies": {
+        "wordwrap": {
+          "version": "0.0.3",
+          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
+          "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
+          "dev": true
+        }
       }
     },
     "optionator": {
@@ -3880,13 +3885,6 @@
         "prelude-ls": "~1.1.2",
         "type-check": "~0.3.2",
         "wordwrap": "~1.0.0"
-      },
-      "dependencies": {
-        "wordwrap": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
-          "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
-        }
       }
     },
     "ordered-read-streams": {
@@ -4167,9 +4165,9 @@
       "integrity": "sha512-w7fLxIRCRT7U8Qu53jQnJyPkYZIaR4n5151KMfcJlO/A9397Wxb1amJvROTK6TOnp7PfoAmg/qXiNHI+08jRfA=="
     },
     "ramda": {
-      "version": "0.25.0",
-      "resolved": "https://registry.npmjs.org/ramda/-/ramda-0.25.0.tgz",
-      "integrity": "sha512-GXpfrYVPwx3K7RQ6aYT8KPS8XViSXUVJT1ONhoKPE9VAleW42YE+U+8VEyGWt41EnEQW7gwecYJriTI0pKoecQ==",
+      "version": "0.26.1",
+      "resolved": "https://registry.npmjs.org/ramda/-/ramda-0.26.1.tgz",
+      "integrity": "sha512-hLWjpy7EnsDBb0p+Z3B7rPi3GDeRG5ZtiI33kJhTt+ORCd38AbAIjB/9zRIUoeTbE/AVX5ZkU7m6bznsvrf8eQ==",
       "dev": true
     },
     "randombytes": {
@@ -4389,6 +4387,14 @@
       "resolved": "https://registry.npmjs.org/ret/-/ret-0.1.15.tgz",
       "integrity": "sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg=="
     },
+    "rimraf": {
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
+      "integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
+      "requires": {
+        "glob": "^7.1.3"
+      }
+    },
     "ripemd160": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.2.tgz",
@@ -4485,21 +4491,6 @@
         "elliptic": "^6.4.1",
         "nan": "^2.14.0",
         "safe-buffer": "^5.1.2"
-      },
-      "dependencies": {
-        "bindings": {
-          "version": "1.5.0",
-          "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
-          "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
-          "requires": {
-            "file-uri-to-path": "1.0.0"
-          }
-        },
-        "nan": {
-          "version": "2.14.0",
-          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
-          "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg=="
-        }
       }
     },
     "semver": {
@@ -4879,7 +4870,7 @@
     },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8="
     },
     "strip-hex-prefix": {
@@ -4913,9 +4904,9 @@
       }
     },
     "table": {
-      "version": "5.4.0",
-      "resolved": "https://registry.npmjs.org/table/-/table-5.4.0.tgz",
-      "integrity": "sha512-nHFDrxmbrkU7JAFKqKbDJXfzrX2UBsWmrieXFTGxiI5e4ncg3VqsZeI4EzNmX0ncp4XNGVeoxIWJXfCIXwrsvw==",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.1.tgz",
+      "integrity": "sha512-E6CK1/pZe2N75rGZQotFOdmzWQ1AILtgYbMAbAjvms0S1l5IDB47zG3nCnFGB/w+7nB3vKofbLXCH7HPBo864w==",
       "requires": {
         "ajv": "^6.9.1",
         "lodash": "^4.17.11",
@@ -4923,17 +4914,6 @@
         "string-width": "^3.0.0"
       },
       "dependencies": {
-        "ajv": {
-          "version": "6.10.0",
-          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.0.tgz",
-          "integrity": "sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==",
-          "requires": {
-            "fast-deep-equal": "^2.0.1",
-            "fast-json-stable-stringify": "^2.0.0",
-            "json-schema-traverse": "^0.4.1",
-            "uri-js": "^4.2.2"
-          }
-        },
         "ansi-regex": {
           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
@@ -4966,7 +4946,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU="
     },
     "through2": {
@@ -5061,9 +5041,9 @@
       }
     },
     "tslib": {
-      "version": "1.9.3",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
-      "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ=="
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ=="
     },
     "type": {
       "version": "1.0.1",
@@ -5598,14 +5578,13 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
     },
     "wordwrap": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
-      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
-      "dev": true
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
     },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "requires": {
         "string-width": "^1.0.1",
@@ -5627,7 +5606,7 @@
         },
         "string-width": {
           "version": "1.0.2",
-          "resolved": "http://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "requires": {
             "code-point-at": "^1.0.0",
@@ -5637,7 +5616,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
             "ansi-regex": "^2.0.0"
@@ -5705,9 +5684,9 @@
       "integrity": "sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw="
     },
     "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
     },
     "y18n": {
       "version": "4.0.0",
diff --git a/package.json b/package.json
index dcebff4..68d5fd7 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
   "license": "GPL-3.0",
   "dependencies": {
     "blake-hash": "^1.1.0",
+    "blake2b": "^2.1.3",
     "snarkjs": "0.1.11",
     "typedarray-to-buffer": "^3.1.5",
     "web3": "^1.0.0-beta.55"
diff --git a/src/poseidon.js b/src/poseidon.js
index 8043c95..0533154 100644
--- a/src/poseidon.js
+++ b/src/poseidon.js
@@ -1,6 +1,6 @@
 const bn128 = require("snarkjs").bn128;
 const bigInt = require("snarkjs").bigInt;
-const createBlakeHash = require("blake-hash");
+const blake2b = require('blake2b');
 const assert = require("assert");
 const F = bn128.Fr;
 
@@ -11,11 +11,12 @@ const T = 6;
 
 function getPseudoRandom(seed, n) {
     const res = [];
-    let h = createBlakeHash("blake256").update(seed).digest();
+    let input = Buffer.from(seed);
+    let h = blake2b(32).update(input).digest()
     while (res.length<n) {
         const n = F.affine(bigInt.leBuff2int(h));
         res.push(n);
-        h = createBlakeHash("blake256").update(h).digest();
+        h = blake2b(32).update(h).digest()
     }
 
     return res;
diff --git a/test/poseidoncircuit.js b/test/poseidoncircuit.js
index 9ffda04..5bb880f 100644
--- a/test/poseidoncircuit.js
+++ b/test/poseidoncircuit.js
@@ -2,11 +2,21 @@ const chai = require("chai");
 const path = require("path");
 const snarkjs = require("snarkjs");
 const compiler = require("circom");
+var blake2b = require('blake2b');
 
 const poseidon = require("../src/poseidon.js");
 
 const assert = chai.assert;
 
+describe("Blake2b version test", function() {
+    it("Should give the expected output for blake2b version", async () => {
+        var output = new Uint8Array(32);
+        var input = Buffer.from('poseidon_constants');
+        h = blake2b(output.length).update(input).digest('hex')
+        assert.equal('e57ba154fb2c47811dc1a2369b27e25a44915b4e4ece4eb8ec74850cb78e01b1', h);
+    });
+});
+
 describe("Poseidon Circuit test", function () {
     let circuit;
 
@@ -20,7 +30,7 @@ describe("Poseidon Circuit test", function () {
         console.log("Poseidon constraints: " + circuit.nConstraints);
     });
 
-    it("Should check constrain", async () => {
+    it("Should check constrain of hash([1, 2])", async () => {
         const w = circuit.calculateWitness({inputs: [1, 2]});
 
         const res = w[circuit.getSignalIdx("main.out")];
@@ -28,12 +38,23 @@ describe("Poseidon Circuit test", function () {
         const hash = poseidon.createHash(6, 8, 57);
 
         const res2 = hash([1,2]);
+        assert.equal('12242166908188651009877250812424843524687801523336557272219921456462821518061', res2.toString());
+        assert.equal(res.toString(), res2.toString());
+        assert(circuit.checkWitness(w));
+    });
 
-        console.log(res.toString());
+    it("Should check constrain of hash([3, 4])", async () => {
+        const w = circuit.calculateWitness({inputs: [3, 4]});
+
+        const res = w[circuit.getSignalIdx("main.out")];
+
+        const hash = poseidon.createHash(6, 8, 57);
+
+        const res2 = hash([3, 4]);
+        assert.equal('17185195740979599334254027721507328033796809509313949281114643312710535000993', res2.toString());
 
         assert.equal(res.toString(), res2.toString());
 
         assert(circuit.checkWitness(w));
-
     });
 });