diff --git a/verifiable/did_doc.go b/verifiable/did_doc.go
index 8fb63b2..7f9e567 100644
--- a/verifiable/did_doc.go
+++ b/verifiable/did_doc.go
@@ -142,6 +142,39 @@ type GistInfoProof struct {
 	Type ProofType `json:"type"`
 }
 
+// MarshalJSON for GistInfoProof
+func (g GistInfoProof) MarshalJSON() ([]byte, error) {
+	proofData, err := json.Marshal(g.Proof)
+	if err != nil {
+		return nil, err
+	}
+	proof := map[string]interface{}{}
+	if err := json.Unmarshal(proofData, &proof); err != nil {
+		return nil, err
+	}
+	proof["type"] = g.Type
+	return json.Marshal(proof)
+}
+
+// UnmarshalJSON for GistInfoProof
+func (g *GistInfoProof) UnmarshalJSON(data []byte) error {
+	var proof merkletree.Proof
+	if err := json.Unmarshal([]byte(data), &proof); err != nil {
+		return err
+	}
+
+	typeStruct := struct {
+		Type ProofType `json:"type"`
+	}{}
+	if err := json.Unmarshal(data, &typeStruct); err != nil {
+		return err
+	}
+
+	g.Proof = proof
+	g.Type = typeStruct.Type
+	return nil
+}
+
 // IdentityState representation all info about identity.
 type IdentityState struct {
 	Published *bool      `json:"published,omitempty"`
diff --git a/verifiable/did_doc_test.go b/verifiable/did_doc_test.go
new file mode 100644
index 0000000..03a6869
--- /dev/null
+++ b/verifiable/did_doc_test.go
@@ -0,0 +1,98 @@
+package verifiable
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/iden3/go-merkletree-sql/v2"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGistInfoProof_JSON_Unmarshal_Marshal(t *testing.T) {
+	in := `{
+			"type": "Iden3SparseMerkleTreeProof",
+            "existence": true,
+            "siblings": [
+              "1362535354014507859867367590099676368653533743679052873579632656491435384778",
+              "11921658728427020988213827821301476324611070652461851254718454837799781090130",
+              "14437346982570868636439880944965253984519016799788166801110955632411304936181",
+              "7008861419840281183040259263097349725975544589604657255528412015559570756430",
+              "12919820512704336619019284308940813320869421725637735792759784734583345278320",
+              "10847811404722023193836917968795578158377516355689063480344319030883153551997",
+              "7501704662566146993443082955484915477984763397289571730014912300112522436190",
+              "15319676397008451935308301168627943776087314271828889852225733045012068685123",
+              "13580625240484189131905658989056965789342053909035527622054608432235108291371",
+              "15701076866894648427718398501239266270187920232235356979681337424723013748037",
+              "18391822292664048359198417757393480551710071249895941413402198372170950884043",
+              "0",
+              "1956510840262628579400226733676154238486255274390348671620337333964042370619",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0",
+              "0"
+            ],
+            "node_aux": {
+              "key": "0",
+              "value": "0"
+            }
+		}`
+
+	var proof GistInfoProof
+	err := json.Unmarshal([]byte(in), &proof)
+	require.NoError(t, err)
+	require.Equal(t, Iden3SparseMerkleTreeProofType, proof.Type)
+	require.Equal(t, true, proof.Existence)
+	require.Len(t, proof.Proof.AllSiblings(), 64)
+	require.Equal(t, &merkletree.HashZero, proof.NodeAux.Key)
+
+	marshaled, err := proof.MarshalJSON()
+	require.NoError(t, err)
+	require.JSONEq(t, in, string(marshaled))
+}