diff --git a/models/signature.go b/models/signature.go
index 08d39e9..e578b02 100644
--- a/models/signature.go
+++ b/models/signature.go
@@ -1,10 +1,17 @@
 package models
 
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
 type JSONSignature struct {
 	Type string `json:"type"`
 	ED25519Signature
 	MultiED25519Signature
 	MultiAgentSignature
+	SingleSender
 }
 
 type ED25519Signature struct {
@@ -25,8 +32,45 @@ type MultiAgentSignature struct {
 	SecondarySigners         []JSONSigner `json:"secondary_signers"`
 }
 
+type SingleSenderSignature struct {
+	Index     uint64 `json:"index"`
+	Signature string `json:"signature"`
+}
+type SingleSender struct {
+	PublicKeys         []string                `json:"public_keys"`
+	Signatures         []SingleSenderSignature `json:"signatures"`
+	SignaturesRequired uint8                   `json:"signatures_required"`
+}
+
 type JSONSigner struct {
 	Type string `json:"type"`
 	ED25519Signature
 	MultiED25519Signature
 }
+
+func (s *JSONSignature) UnmarshalJSON(raw []byte) error {
+	var simple struct {
+		Type string `json:"type"`
+	}
+	err := json.Unmarshal(raw, &simple)
+	if err != nil {
+		return err
+	}
+	switch strings.ToLower(strings.ReplaceAll(simple.Type, "_", "")) {
+	case "ed25519signature":
+		err = json.Unmarshal(raw, &s.ED25519Signature)
+	case "multied25519signature":
+		err = json.Unmarshal(raw, &s.MultiED25519Signature)
+	case "multiagentsignature":
+		err = json.Unmarshal(raw, &s.MultiAgentSignature)
+	case "singlesender":
+		err = json.Unmarshal(raw, &s.SingleSender)
+	default:
+		return fmt.Errorf("unknown signature type %q", simple.Type)
+	}
+	if err != nil {
+		return err
+	}
+	s.Type = simple.Type
+	return nil
+}
diff --git a/models/signature_test.go b/models/signature_test.go
new file mode 100644
index 0000000..1211f4e
--- /dev/null
+++ b/models/signature_test.go
@@ -0,0 +1,67 @@
+package models
+
+import (
+	"encoding/json"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func Test_unmarshalSignature0(t *testing.T) {
+	cnt := `
+{
+  "public_key": "0xde062760a3477cc7c779239cff774ac123196dac5f448126c8f10a396bdf61ff",
+  "signature": "0xcab74ee1a7be09d5dded094dbcff218f27bd451387782e76d4ab9fe5dc15d2c4c0274350869913cbcb0d24f475fe7edbf71e048e6a208f6a7ecc4a3887c63702",
+  "type": "ed25519_signature"
+}
+`
+	var s JSONSignature
+	assert.NoError(t, json.Unmarshal([]byte(cnt), &s))
+	assert.Equal(t, JSONSignature{
+		Type: "ed25519_signature",
+		ED25519Signature: ED25519Signature{
+			PublicKey: "0xde062760a3477cc7c779239cff774ac123196dac5f448126c8f10a396bdf61ff",
+			Signature: "0xcab74ee1a7be09d5dded094dbcff218f27bd451387782e76d4ab9fe5dc15d2c4c0274350869913cbcb0d24f475fe7edbf71e048e6a208f6a7ecc4a3887c63702",
+		},
+		MultiED25519Signature: MultiED25519Signature{},
+		MultiAgentSignature:   MultiAgentSignature{},
+		SingleSender:          SingleSender{},
+	}, s)
+}
+
+func Test_unmarshalSignature1(t *testing.T) {
+	cnt := `
+{
+  "public_keys": [
+	"0x1b68747470733a2f2f6163636f756e74732e676f6f676c652e636f6d2073de33a2f41ce989a61922213b0de92a90b423aa36e781aa15e6d8910bf65826",
+	"0x1b68747470733a2f2f6163636f756e74732e676f6f676c652e636f6d2086b8bffaa6459d9a61a5f5c73b0ac4d8dfd33f2956b0652fbac35bda858eb71d"
+  ],
+  "signatures": [
+	{
+	  "index": 0,
+	  "signature": "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"
+	}
+  ],
+  "signatures_required": 1,
+  "type": "single_sender"
+}
+`
+	var s JSONSignature
+	assert.NoError(t, json.Unmarshal([]byte(cnt), &s))
+	assert.Equal(t, JSONSignature{
+		Type:                  "single_sender",
+		ED25519Signature:      ED25519Signature{},
+		MultiED25519Signature: MultiED25519Signature{},
+		MultiAgentSignature:   MultiAgentSignature{},
+		SingleSender: SingleSender{
+			PublicKeys: []string{
+				"0x1b68747470733a2f2f6163636f756e74732e676f6f676c652e636f6d2073de33a2f41ce989a61922213b0de92a90b423aa36e781aa15e6d8910bf65826",
+				"0x1b68747470733a2f2f6163636f756e74732e676f6f676c652e636f6d2086b8bffaa6459d9a61a5f5c73b0ac4d8dfd33f2956b0652fbac35bda858eb71d",
+			},
+			Signatures: []SingleSenderSignature{{
+				Index:     0,
+				Signature: "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",
+			}},
+			SignaturesRequired: 1,
+		},
+	}, s)
+}