diff --git a/circom_circuits/Mantle/generate_inputs_for_proof_of_claim.py b/circom_circuits/Mantle/generate_inputs_for_proof_of_claim.py
new file mode 100755
index 0000000..9ef3547
--- /dev/null
+++ b/circom_circuits/Mantle/generate_inputs_for_proof_of_claim.py
@@ -0,0 +1,236 @@
+#!/usr/bin/sage
+# -*- mode: python ; -*-
+
+
+from sage.all import *
+
+p = 21888242871839275222246405745257275088548364400416034343698204186575808495617
+F = FiniteField(p)
+
+def poseidon2_hash(data):
+    return PoseidonSponge(data,2,1)[0]
+
+
+
+def Poseidon2_sponge_hash_rate_1(data, n):
+    return PoseidonSponge(data,3,2,n,1)
+
+def Poseidon2_sponge_hash_rate_2(data, n):
+    return PoseidonSponge(data,3,1,n,1)
+
+
+def SBox(inp):
+    return inp**5
+
+def InternalRound(inp, i):
+    round_consts = [ 0x15ce7e5ae220e8623a40b3a3b22d441eff0c9be1ae1d32f1b777af84eea7e38c
+    , 0x1bf60ac8bfff0f631983c93e218ca0d4a4059c254b4299b1d9984a07edccfaf0
+    , 0x0fab0c9387cb2bec9dc11b2951088b9e1e1d2978542fc131f74a8f8fdac95b40
+    , 0x07d085a48750738019784663bccd460656dc62c1b18964a0d27a5bd0c27ee453
+    , 0x10d57b1fad99da9d3fe16cf7f5dae05be844f67b2e7db3472a2e96e167578bc4
+    , 0x0c36c40f7bd1934b7d5525031467aa39aeaea461996a70eda5a2a704e1733bb0
+    , 0x0e4b65a0f3e1f9d3166a2145063c999bd08a4679676d765f4d11f97ed5c080ae
+    , 0x1ce5561061120d5c7ea09da2528c4c041b9ad0f05d655f38b10d79878b69f29d
+    , 0x2d323f651c3da8f0e0754391a10fa111b25dfa00471edf5493c44dfc3f28add6
+    , 0x05a0741ee5bdc3e099fd6bdad9a0865bc9ceecd13ea4e702e536dd370b8f1953
+    , 0x176a2ec4746fc0e0eca9e5e11d6facaee05524a92e5785c8b8161780a4435136
+    , 0x0691faf0f42a9ed97629b1ae0dc7f1b019c06dd852cb6efe57f7eeb1aa865aef
+    , 0x0e46cf138dad09d61b9a7cab95a23b5c8cb276874f3715598bacb55d5ad271de
+    , 0x0f18c3d95bac1ac424160d240cdffc2c44f7b6315ba65ed3ff2eff5b3e48b4f2
+    , 0x2eea6af14b592ec45a4119ac1e6e6f0312ecd090a096e340d472283e543ddff7
+    , 0x06b0d7a8f4ce97d049ae994139f5f71dca4899d4f1cd3dd83a32a89a58c0a8e6
+    , 0x019df0b9828eed5892dd55c1ad6408196f6293d600ef4491703a1b37e119ba8e
+    , 0x08ca5e3c93817cdb1c2b2a12d02c779d74c1bb12b6668f3ab3ddd7837f3a4a00
+    , 0x28382d747e3fd6cb2e0d8e8edd79c5313eed307a3517c11046245b1476e4f701
+    , 0x0ca89aecd5675b77c8271765da98cfcb6875b3053d4742c9ff502861bd16ad28
+    , 0x19046bc0b03ca90802ec83f212001e7ffd7f9224cfffae523451deb52eab3787
+    , 0x036fd7dfa1c05110b3428e6abcc43e1de9abba915320c4a600f843bfb676ca51
+    , 0x08f0a7abcb1a2f6595a9b7380c5028e3999db4fe5cb21892e5bb5cb11a7757ba
+    , 0x0b614acc1ce3fbe9048f8385e4ee24c3843deea186bacea3c904c9f6340ad8cb
+    , 0x00b2d98c5d988f9b41f2c98e017fc954a6ae423b2261575941f8eac8835d985c
+    , 0x1457f18555b7973ba5b311d57ec5d77e936980b97f5973875f1f7cc765a4fc95
+    , 0x002b453debc1bee525cb751bc10641a6b86f847d696418cf1144950982591bfa
+    , 0x0c2af1abcc6ece77218315d2af445ccbfc6647b7af2510682882cc792c6bb8cf
+    , 0x0e2825d9eb84b59902a1adb49ac0c2c291dee7c45d2e8c30369a4d595039e8ad
+    , 0x297e2e86a8c672d39f3343b8dfce7a6f20f3571bfd5c8a28e3905aa2dcfeca44
+    , 0x00d397281d902e49ec6504ba9186e806db9ad4fc8f86e7277aa7f1467eb6f9de
+    , 0x2fb7c89c372d7e2050e7377ed471000c73544a2b9fd66557f3577c09cac98b4b
+    , 0x16125247be4387a8c3e62490167f0cffdba02eda4f018d0b40639a13bb0cfef9
+    , 0x2291fd9d442f2d9b97ab22f7d4d52c2a82e41f852cf620b144612650a39e26e8
+    , 0x1eec61f16a275ae238540feaeeadfec56d32171b1cc393729d06f37f476fde71
+    , 0x259ce871ba5dacbb48d8aed3d8513eef51558dc0b360f28c1a15dbfc5e7f6ca2
+    , 0x2d3376a14ddbf95587e2f7567ff04fe13a3c7cb17363c8b9c5dd1d9262a210cb
+    , 0x13b843d9f65f4cddd7ce10d9cad9b8b99ac5e9a8c4269288173a91c0f3c3b084
+    , 0x0b52e9b2f1aa9fd204e4a42c481cc76c704783e34114b8e93e026a50fa9764e8
+    , 0x1fd083229276c7f27d3ad941476b394ff37bd44d3a1e9caca1400d9077a2056c
+    , 0x22743c328a6283f3ba7379af22c684c498568fd7ad9fad5151368c913197cbd9
+    , 0x043007aefd9741070d95caaaba0c1b070e4eec8eef8c1e512c8e579c6ed64f76
+    , 0x17ab175144f64bc843074f6b3a0c57c5dd2c954af8723c029ee642539496a7b3
+    , 0x2befcad3d53fba5eeef8cae9668fed5c1e9e596a46e8458e218f7a665fddf4eb
+    , 0x15151c4116d97de74bfa6ca3178f73c8fe8fe612c70c6f85a7a1551942cb71cc
+    , 0x2ac40bf6c3176300a6835d5fc7cc4fd5e5d299fb1baa86487268ec1b9eedfa97
+    , 0x0f151de1f01b4e24ffe04279318f0a68efabb485188f191e37e6915ff6059f6e
+    , 0x2e43dffc34537535182aebac1ad7bf0a5533b88f65f9652f0ad584e2ffc4dd1f
+    , 0x2ebabc2c37ef53d8b13b24a2a2b729d536735f58956125a3876da0664c2442d7
+    , 0x0dc3beceb34e49f5ad7226dd202c5cf879dffcc9a6dd32a300e8f2a4b59edf03
+    , 0x2f1ddeccce83adf68779c53b639871a8f81d4d00aefe1e812efce8ec999d457d
+    , 0x1f63e41280ff5c021715d52b19780298ed8bd3d5eb506316b527e24149d4d4f1
+    , 0x1b8c1252a5888f8cb2672effb5df49c633d3fd7183271488a1c40d0f88e7636e
+    , 0x0f45697130f5498e2940568ef0d5e9e16b1095a6cdbb6411df20a973c605e70b
+    , 0x0780ccc403cdd68983acbd34cda41cacfb2cf911a93076bc25587b4b0aed4929
+    , 0x238d26ca97c691591e929f32199a643550f325f23a85d420080b289d7cecc9d4
+    ]
+
+    sb = SBox(inp[0] + round_consts[i])
+    out = [F(0) for i in range(3)]
+    out[0] = 2*sb + inp[1] +   inp[2];
+    out[1] =   sb + 2*inp[1] +   inp[2];
+    out[2] =   sb +   inp[1] + 3*inp[2];
+    return out
+
+def ExternalRound(inp, i):
+    out = [F(0) for j in range(3)]
+    round_consts = [ [ F(0x2c4c51fd1bb9567c27e99f5712b49e0574178b41b6f0a476cddc41d242cf2b43)
+      , F(0x1c5f8d18acb9c61ec6fcbfcda5356f1b3fdee7dc22c99a5b73a2750e5b054104)
+      , F(0x2d3c1988b4541e4c045595b8d574e98a7c2820314a82e67a4e380f1c4541ba90 )
+      ]
+    , [ F(0x052547dc9e6d936cab6680372f1734c39f490d0cb970e2077c82f7e4172943d3)
+      , F(0x29d967f4002adcbb5a6037d644d36db91f591b088f69d9b4257694f5f9456bc2)
+      , F(0x0350084b8305b91c426c25aeeecafc83fc5feec44b9636cb3b17d2121ec5b88a)
+      ]
+    , [ F(0x1815d1e52a8196127530cc1e79f07a0ccd815fb5d94d070631f89f6c724d4cbe)
+      , F(0x17b5ba882530af5d70466e2b434b0ccb15b7a8c0138d64455281e7724a066272)
+      , F(0x1c859b60226b443767b73cd1b08823620de310bc49ea48662626014cea449aee)
+      ]
+    , [ F(0x1b26e7f0ac7dd8b64c2f7a1904c958bb48d2635478a90d926f5ff2364effab37)
+      , F(0x2da7f36850e6c377bdcdd380efd9e7c419555d3062b0997952dfbe5c54b1a22e)
+      , F(0x17803c56450e74bc6c7ff97275390c017f682db11f3f4ca6e1f714efdfb9bd66)
+      ]
+    , [ F(0x25672a14b5d085e31a30a7e1d5675ebfab034fb04dc2ec5e544887523f98dede)
+      , F(0x0cf702434b891e1b2f1d71883506d68cdb1be36fa125674a3019647b3a98accd)
+      , F(0x1837e75235ff5d112a5eddf7a4939448748339e7b5f2de683cf0c0ae98bdfbb3)
+      ] 
+    , [ F(0x1cd8a14cff3a61f04197a083c6485581a7d836941f6832704837a24b2d15613a)
+      , F(0x266f6d85be0cef2ece525ba6a54b647ff789785069882772e6cac8131eecc1e4)
+      , F(0x0538fde2183c3f5833ecd9e07edf30fe977d28dd6f246d7960889d9928b506b3)
+      ] 
+    , [ F(0x07a0693ff41476abb4664f3442596aa8399fdccf245d65882fce9a37c268aa04)
+      , F(0x11eb49b07d33de2bd60ea68e7f652beda15644ed7855ee5a45763b576d216e8e)
+      , F(0x08f8887da6ce51a8c06041f64e22697895f34bacb8c0a39ec12bf597f7c67cfc)
+      ] 
+    , [ F(0x2a912ec610191eb7662f86a52cc64c0122bd5ba762e1db8da79b5949fdd38092)
+      , F(0x2031d7fd91b80857aa1fef64e23cfad9a9ba8fe8c8d09de92b1edb592a44c290)
+      , F(0x0f81ebce43c47711751fa64d6c007221016d485641c28c507d04fd3dc7fba1d2)
+      ] 
+    ]
+
+    sb = [F(0) for j in range(3)]
+    for j in range(3):
+        sb[j] = SBox(F(inp[j] + round_consts[i][j]))
+    out = [F(0) for j in range(3)]
+    out[0] = 2*sb[0] +   sb[1] +   sb[2]
+    out[1] = sb[0] + 2*sb[1] +   sb[2]
+    out[2] =   sb[0]+   sb[1] + 2*sb[2]
+    return out
+
+def LinearLayer(inp):
+    out = [F(0) for i in range(3)]
+    out[0] = 2*inp[0] +   inp[1] +   inp[2]
+    out[1] =   inp[0] + 2*inp[1] +   inp[2]
+    out[2] =   inp[0] +   inp[1] + 2*inp[2] 
+    return out
+
+def Permutation(inp):
+    out = [F(0) for i in range(3)]
+    
+    state = LinearLayer(inp)
+    
+    for k in range(4):
+        state = ExternalRound(state, k)
+    for k in range(56):
+        state = InternalRound(state, k)
+    for k in range(4):
+        state = ExternalRound(state, k+4)
+    return state
+
+def Compression(inp):
+    return Permutation([inp[0],inp[1],F(0)])
+
+def PoseidonSponge(data, capacity, output_len):
+    rate = 3 - capacity;
+    output = [F(0) for i in range(output_len)]
+    assert( capacity > 0 )
+    assert( rate     > 0 )
+    assert( capacity < 3 )
+    assert( rate     < 3 )
+    
+    # round up to rate the input + 1 field element ("10*" padding)
+    nblocks    = ((len(data) + 1) + (rate-1)) // rate;
+    nout       = (output_len      + (rate-1)) // rate;
+    padded_len = nblocks * rate;
+
+    padded = []
+    for i in range(len(data)):
+        padded.append(F(data[i]))
+    padded.append(F(1))
+    for i in range(len(data)+1,padded_len):
+        padded.append(F(0))
+        
+    civ = F(2**64 + 256*3 + rate)
+
+    state = [F(0),F(0),F(civ)]
+    sorbed = [F(0) for j in range(rate)]
+
+    for m in range(nblocks):
+        for i in range(rate):
+            a = state[i]
+            b = padded[m*rate+i]
+            sorbed[i] = a + b
+        state = Permutation(sorbed[0:rate] + state[rate:3])
+
+    q = min(rate, output_len)
+    for i in range(q):
+        output[i] = state[i]
+    out_ptr = rate
+
+    for n in range(1,nout):
+        state[nblocks+n] = Permutation(state[nblocks+n-1])
+        q = min(rate, output_len-out_ptr)
+        for i in range(q):
+            output[out_ptr+i] = state[nblocks+n][i]
+        out_ptr += rate
+
+    return output
+
+
+
+
+secret_voucher = F(randrange(0,p,1))
+reward_voucher = poseidon2_hash([F(220700623067091879569340598814410483038955857088532228155209730029981553361),secret_voucher])
+
+merkle_nodes = [F(randrange(0,p,1)) for i in range(32)]
+selectors = randrange(0,2**32,1)
+selectors = format(selectors,'032b')
+voucher_root = reward_voucher
+for i in range(32):
+    if int(selectors[31-i]) == 0:
+        voucher_root = poseidon2_hash([voucher_root,merkle_nodes[i]])
+    else:
+        voucher_root = poseidon2_hash([merkle_nodes[i],voucher_root])
+
+data_msg = F(randrange(0,p,1))
+
+inp = {
+  "secret_voucher":     str(secret_voucher),
+  "merkle_nodes":       [str(x) for x in merkle_nodes],
+  "selectors":          [str(x) for x in selectors],
+  "attached_data":      str(data_msg),
+  "voucher_root":       str(voucher_root)
+}
+
+import json
+
+with open("input.json","w") as f:
+    json.dump(inp, f, indent=2)
+
+print("Wrote input of proof of claim")
\ No newline at end of file
diff --git a/circom_circuits/Mantle/proof_of_claim.circom b/circom_circuits/Mantle/proof_of_claim.circom
new file mode 100644
index 0000000..050bdfc
--- /dev/null
+++ b/circom_circuits/Mantle/proof_of_claim.circom
@@ -0,0 +1,69 @@
+//test
+pragma circom 2.1.9;
+
+include "../hash_bn/poseidon2_hash.circom";
+include "../ledger/merkle.circom";
+include "../misc/constants.circom";
+
+template derive_voucher_nullifier(){
+    signal input secret_voucher;
+    signal output out;
+
+    component hash = Poseidon2_hash(2);
+    component dst = VOUCHER_NF();
+    hash.inp[0] <== dst.out;
+    hash.inp[1] <== secret_voucher;
+
+    out <== hash.out;
+}
+
+template derive_reward_voucher(){
+    signal input secret_voucher;
+    signal output out;
+
+    component hash = Poseidon2_hash(2);
+    component dst = REWARD_VOUCHER();
+    hash.inp[0] <== dst.out;
+    hash.inp[1] <== secret_voucher;
+
+    out <== hash.out;
+}
+
+template proof_of_claim(){
+    signal input secret_voucher;
+    signal input merkle_nodes[32];
+    signal input selectors[32];
+    signal input attached_data;
+    signal input voucher_root;
+
+    signal output voucher_nullifier;
+
+    //derive the reward voucher
+    component reward_voucher = derive_reward_voucher();
+    reward_voucher.secret_voucher <== secret_voucher;
+
+    //verify reward voucher membership
+    component reward_membership = proof_of_membership(32);
+    for(var i = 0; i < 32; i++){
+        reward_membership.nodes[i] <== merkle_nodes[i];
+        reward_membership.selector[i] <== selectors[i];
+    }
+    reward_membership.root <== voucher_root;
+    reward_membership.leaf <== reward_voucher.out;
+
+    reward_membership.out === 1;
+
+
+    //derive the reward nullifier
+    component reward_nullifier = derive_voucher_nullifier();
+    reward_nullifier.secret_voucher <== secret_voucher;
+    voucher_nullifier <== reward_nullifier.out;
+
+    
+
+    // dummy constraint to avoid unused public input to be erased after compilation optimisation
+    signal dummy;
+    dummy <== attached_data * attached_data;
+}
+
+component main {public [voucher_root,attached_data]}= proof_of_claim();
\ No newline at end of file
diff --git a/circom_circuits/misc/constants.circom b/circom_circuits/misc/constants.circom
index 7dd8b73..5d7a196 100644
--- a/circom_circuits/misc/constants.circom
+++ b/circom_circuits/misc/constants.circom
@@ -51,3 +51,15 @@ template PROOF_NULLIFIER_V1(){
     signal output out;
     out <== 122037697982558563853882923701277343284564598726996395839110393320403237949;
 }
+
+// int.from_bytes(hashlib.blake2b(b"REWARD_VOUCHER", digest_size=32).digest()[:-1], "little") = 220700623067091879569340598814410483038955857088532228155209730029981553361
+template REWARD_VOUCHER(){
+    signal output out;
+    out <== 220700623067091879569340598814410483038955857088532228155209730029981553361;
+}
+
+// int.from_bytes(hashlib.blake2b(b"VOUCHER_NF", digest_size=32).digest()[:-1], "little") = 439345205760851690220461057889339186886122855215620687318972412183373920167
+template VOUCHER_NF(){
+    signal output out;
+    out <== 439345205760851690220461057889339186886122855215620687318972412183373920167;
+}
\ No newline at end of file