diff --git a/README.md b/README.md
index 0575840..23bc471 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-![build](https://github.com/hyperledger/firefly-tezosconnect/actions/workflows/go.yml/badge.svg?branch=main)
+![build](https://github.com/hyperledger/firefly-tezosconnect/actions/workflows/build.yml/badge.svg?branch=main)
 [![codecov](https://codecov.io/gh/hyperledger/firefly-tezosconnect/branch/main/graph/badge.svg)](https://codecov.io/gh/hyperledger/firefly-tezosconnect)
 [![Go Reference](https://pkg.go.dev/badge/github.com/hyperledger/firefly-tezosconnect.svg)](https://pkg.go.dev/github.com/hyperledger/firefly-tezosconnect)
 
diff --git a/internal/tezos/estimate_gas.go b/internal/tezos/estimate_gas.go
index 130471d..54da800 100644
--- a/internal/tezos/estimate_gas.go
+++ b/internal/tezos/estimate_gas.go
@@ -2,12 +2,10 @@ package tezos
 
 import (
 	"context"
-	"errors"
 
 	"github.com/hyperledger/firefly-transaction-manager/pkg/ffcapi"
 )
 
 func (c *tezosConnector) GasEstimate(_ context.Context, _ *ffcapi.TransactionInput) (*ffcapi.GasEstimateResponse, ffcapi.ErrorReason, error) {
-	// TODO: implement
-	return nil, ffcapi.ErrorReason("not implemented"), errors.New("not implemented")
+	return nil, "", nil
 }
diff --git a/internal/tezos/estimate_gas_test.go b/internal/tezos/estimate_gas_test.go
new file mode 100644
index 0000000..c61eea6
--- /dev/null
+++ b/internal/tezos/estimate_gas_test.go
@@ -0,0 +1,18 @@
+package tezos
+
+import (
+	"testing"
+
+	"github.com/hyperledger/firefly-transaction-manager/pkg/ffcapi"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGasEstimate(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	resp, reason, err := c.GasEstimate(ctx, &ffcapi.TransactionInput{})
+	assert.Nil(t, resp)
+	assert.Empty(t, reason)
+	assert.NoError(t, err)
+}
diff --git a/internal/tezos/get_receipt.go b/internal/tezos/get_receipt.go
index b3558a6..efccaca 100644
--- a/internal/tezos/get_receipt.go
+++ b/internal/tezos/get_receipt.go
@@ -32,12 +32,11 @@ type receiptExtraInfo struct {
 func (c *tezosConnector) TransactionReceipt(ctx context.Context, req *ffcapi.TransactionReceiptRequest) (*ffcapi.TransactionReceiptResponse, ffcapi.ErrorReason, error) {
 	// ensure block observer is running
 	rpcClient := c.client.(*rpc.Client)
-	mon := rpcClient.BlockObserver
-	mon.Listen(rpcClient)
+	rpcClient.Listen()
 
 	// wait for confirmations
 	res := rpc.NewResult(tezos.MustParseOpHash(req.TransactionHash)) // .WithTTL(op.TTL).WithConfirmations(opts.Confirmations)
-	res.Listen(mon)
+	res.Listen(rpcClient.BlockObserver)
 	res.WaitContext(ctx)
 	if err := res.Err(); err != nil {
 		return nil, "", err
diff --git a/internal/tezos/prepare_transaction.go b/internal/tezos/prepare_transaction.go
index 131ef44..2566c40 100644
--- a/internal/tezos/prepare_transaction.go
+++ b/internal/tezos/prepare_transaction.go
@@ -137,7 +137,7 @@ func (c *tezosConnector) completeOp(ctx context.Context, op *codec.Op, fromStrin
 	mayNeedReveal := len(op.Contents) > 0 && op.Contents[0].Kind() != tezos.OpTypeReveal
 	// add reveal if necessary
 	if mayNeedReveal && !state.IsRevealed() {
-		key, err := c.getPubKeyFromSignatory(op.Source.String())
+		key, err := c.getPubKeyFromSignatory(ctx, op.Source.String())
 		if err != nil {
 			return err
 		}
@@ -178,9 +178,9 @@ func getNetworkParamsByName(name string) *tezos.Params {
 	}
 }
 
-func (c *tezosConnector) getPubKeyFromSignatory(tezosAddress string) (*tezos.Key, error) {
+func (c *tezosConnector) getPubKeyFromSignatory(ctx context.Context, tezosAddress string) (*tezos.Key, error) {
 	url := c.signatoryURL + "/keys/" + tezosAddress
-	req, err := http.NewRequest("GET", url, nil)
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
 	if err != nil {
 		return nil, err
 	}
@@ -195,10 +195,7 @@ func (c *tezosConnector) getPubKeyFromSignatory(tezosAddress string) (*tezos.Key
 	}
 	defer resp.Body.Close()
 
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, err
-	}
+	body, _ := io.ReadAll(resp.Body)
 
 	var pubKeyJSON struct {
 		PubKey string `json:"public_key"`
diff --git a/internal/tezos/prepare_transaction_test.go b/internal/tezos/prepare_transaction_test.go
index 8cda76f..8954396 100644
--- a/internal/tezos/prepare_transaction_test.go
+++ b/internal/tezos/prepare_transaction_test.go
@@ -3,6 +3,8 @@ package tezos
 import (
 	"encoding/json"
 	"errors"
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"blockwatch.cc/tzgo/codec"
@@ -15,7 +17,7 @@ import (
 	"github.com/stretchr/testify/mock"
 )
 
-func TestTransactionPrepareOk(t *testing.T) {
+func TestTransactionPrepareSuccess(t *testing.T) {
 	ctx, c, mRPC, done := newTestConnector(t)
 	defer done()
 
@@ -66,6 +68,75 @@ func TestTransactionPrepareOk(t *testing.T) {
 	assert.NotEmpty(t, res.TransactionData)
 }
 
+func TestTransactionPrepareWithRevealSuccess(t *testing.T) {
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.ContractInfo{
+			Counter: 10,
+			Manager: "89Jj4aVWetK69CWm5ss1LayvK8dQoiFz7p995y1k3E8CZwqJ6",
+		}, nil)
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("{\"public_key\":\"edpkvHVuLHkr5eDiTtQKyUPqgYVAk3Sy4m7qBD8r6abemHkZsMU5Kh\"}"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	mRPC.On("Simulate", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.Receipt{
+			Op: &rpc.Operation{
+				Contents: []rpc.TypedOperation{
+					rpc.Reveal{
+						Manager: rpc.Manager{
+							Generic: rpc.Generic{
+								Metadata: rpc.OperationMetadata{
+									Result: rpc.OperationResult{
+										Status: tezos.OpStatusApplied,
+									},
+								},
+							},
+						},
+					},
+					rpc.Transaction{
+						Manager: rpc.Manager{
+							Generic: rpc.Generic{
+								Metadata: rpc.OperationMetadata{
+									Result: rpc.OperationResult{
+										Status: tezos.OpStatusApplied,
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		}, nil)
+
+	req := &ffcapi.TransactionPrepareRequest{
+		TransactionInput: ffcapi.TransactionInput{
+			TransactionHeaders: ffcapi.TransactionHeaders{
+				From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+				To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+			},
+			Method: fftypes.JSONAnyPtr("\"pause\""),
+			Params: []*fftypes.JSONAny{
+				fftypes.JSONAnyPtr("{\"entrypoint\":\"pause\",\"value\":{\"prim\":\"True\"}}"),
+			},
+		},
+	}
+	res, reason, err := c.TransactionPrepare(ctx, req)
+	assert.NoError(t, err)
+	assert.Empty(t, reason)
+	assert.NotNil(t, res)
+	assert.NotEmpty(t, res.TransactionData)
+}
+
 func TestTransactionPrepareWrongParamsError(t *testing.T) {
 	ctx, c, _, done := newTestConnector(t)
 	defer done()
@@ -318,3 +389,122 @@ func Test_estimateAndAssignExceedMaxLimitError(t *testing.T) {
 	_, err := c.estimateAndAssignTxCost(ctx, op, opts)
 	assert.Error(t, err)
 }
+
+func TestTransactionPrepareWithRevealEmptyServerError(t *testing.T) {
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.ContractInfo{
+			Counter: 10,
+			Manager: "89Jj4aVWetK69CWm5ss1LayvK8dQoiFz7p995y1k3E8CZwqJ6",
+		}, nil)
+
+	req := &ffcapi.TransactionPrepareRequest{
+		TransactionInput: ffcapi.TransactionInput{
+			TransactionHeaders: ffcapi.TransactionHeaders{
+				From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+				To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+			},
+			Method: fftypes.JSONAnyPtr("\"pause\""),
+			Params: []*fftypes.JSONAny{
+				fftypes.JSONAnyPtr("{\"entrypoint\":\"pause\",\"value\":{\"prim\":\"True\"}}"),
+			},
+		},
+	}
+	resp, _, err := c.TransactionPrepare(ctx, req)
+	assert.Error(t, err)
+	assert.Nil(t, resp)
+}
+
+func Test_getNetworkParamsByName(t *testing.T) {
+	params := getNetworkParamsByName("ghostnet")
+	assert.Equal(t, params, tezos.GhostnetParams)
+
+	params = getNetworkParamsByName("nairobinet")
+	assert.Equal(t, params, tezos.NairobinetParams)
+
+	params = getNetworkParamsByName("default")
+	assert.Equal(t, params, tezos.DefaultParams)
+}
+
+func Test_getPubKeyFromSignatoryInvalidRespKeySuccess(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("{\"public_key\":\"edpkvHVuLHkr5eDiTtQKyUPqgYVAk3Sy4m7qBD8r6abemHkZsMU5Kh\"}"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	resp, err := c.getPubKeyFromSignatory(ctx, "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN")
+	assert.NotNil(t, resp)
+	assert.NoError(t, err)
+}
+
+func Test_getPubKeyFromSignatoryyNilContextError(t *testing.T) {
+	_, c, _, done := newTestConnector(t)
+	defer done()
+
+	_, err := c.getPubKeyFromSignatory(nil, "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN")
+	assert.Error(t, err)
+}
+
+func Test_getPubKeyFromSignatoryHttpError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	_, err := c.getPubKeyFromSignatory(ctx, "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN")
+	assert.Error(t, err)
+}
+
+func Test_getPubKeyFromSignatoryHttpWrongStatusError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(500)
+		w.Write([]byte("internal error"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	_, err := c.getPubKeyFromSignatory(ctx, "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN")
+	assert.Error(t, err)
+}
+
+func Test_getPubKeyFromSignatoryUnmarshalRespError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write(nil)
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	_, err := c.getPubKeyFromSignatory(ctx, "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN")
+	assert.Error(t, err)
+}
+
+func Test_getPubKeyFromSignatoryInvalidRespKeyError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("{\"public_key\":\"invalid\"}"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	_, err := c.getPubKeyFromSignatory(ctx, "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN")
+	assert.Error(t, err)
+}
diff --git a/internal/tezos/send_transaction.go b/internal/tezos/send_transaction.go
index e8dac73..c3cd2ae 100644
--- a/internal/tezos/send_transaction.go
+++ b/internal/tezos/send_transaction.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -49,11 +50,14 @@ func (c *tezosConnector) TransactionSend(ctx context.Context, req *ffcapi.Transa
 	}, "", nil
 }
 
-func (c *tezosConnector) signTxRemotely(_ context.Context, op *codec.Op) error {
+func (c *tezosConnector) signTxRemotely(ctx context.Context, op *codec.Op) error {
+	if op == nil {
+		return errors.New("operation is empty")
+	}
 	url := c.signatoryURL + "/keys/" + op.Source.String()
 	requestBody, _ := json.Marshal(hex.EncodeToString(op.WatermarkedBytes()))
 
-	req, err := http.NewRequest("POST", url, bytes.NewBuffer(requestBody))
+	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(requestBody))
 	if err != nil {
 		return err
 	}
@@ -68,10 +72,7 @@ func (c *tezosConnector) signTxRemotely(_ context.Context, op *codec.Op) error {
 	}
 	defer resp.Body.Close()
 
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return err
-	}
+	body, _ := io.ReadAll(resp.Body)
 
 	var signatureJSON struct {
 		Signature string
diff --git a/internal/tezos/send_transaction_test.go b/internal/tezos/send_transaction_test.go
index dbeed43..1076d36 100644
--- a/internal/tezos/send_transaction_test.go
+++ b/internal/tezos/send_transaction_test.go
@@ -2,14 +2,54 @@ package tezos
 
 import (
 	"errors"
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
+	"blockwatch.cc/tzgo/codec"
+	"blockwatch.cc/tzgo/rpc"
 	"blockwatch.cc/tzgo/tezos"
 	"github.com/hyperledger/firefly-transaction-manager/pkg/ffcapi"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 )
 
+func TestTransactionSendSuccess(t *testing.T) {
+	// Set up tezos connector mocks
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("{\"signature\":\"sigWetzF5zVM2qdYt8QToj7e5cNBm9neiPRc3rpePBDrr8N1brFbErv2YfXMSoSgemJ8AwZcLfmkBDg78bmUEzF1sf1YotnS\"}"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.ContractInfo{
+			Counter: 10,
+			Manager: "edpkv89Jj4aVWetK69CWm5ss1LayvK8dQoiFz7p995y1k3E8CZwqJ6",
+		}, nil)
+
+	mRPC.On("Broadcast", ctx, mock.Anything).
+		Return(tezos.OpHash([]byte("oovD5cUigLGLT6kGDqsLMyF2sc3MLyfYhJWRymCPxUKEx3vtQ5v")), nil)
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionHeaders: ffcapi.TransactionHeaders{
+			From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+			To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+		},
+		TransactionData: "424d426559724d4a704c577271437337555463466155514365574271736a434c6c00889816a17ae688c971be1ad34bfe1990f8fa5e0f000b0000000130a980e6e41028da2cacfca4ddefea252d18bed900ffff05706175736500000002030a",
+	}
+	resp, _, err := c.TransactionSend(ctx, req)
+	assert.Nil(t, err)
+	assert.NotNil(t, resp)
+}
+
 func TestTransactionSendDecodeStrError(t *testing.T) {
 	ctx, c, _, done := newTestConnector(t)
 	defer done()
@@ -70,3 +110,156 @@ func TestTransactionSendGetContractExtError(t *testing.T) {
 	_, _, err := c.TransactionSend(ctx, req)
 	assert.Error(t, err)
 }
+
+func TestTransactionSendBroadcastError(t *testing.T) {
+	// Set up tezos connector mocks
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("{\"signature\":\"sigWetzF5zVM2qdYt8QToj7e5cNBm9neiPRc3rpePBDrr8N1brFbErv2YfXMSoSgemJ8AwZcLfmkBDg78bmUEzF1sf1YotnS\"}"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.ContractInfo{
+			Counter: 10,
+			Manager: "edpkv89Jj4aVWetK69CWm5ss1LayvK8dQoiFz7p995y1k3E8CZwqJ6",
+		}, nil)
+
+	mRPC.On("Broadcast", ctx, mock.Anything).
+		Return(nil, errors.New("error"))
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionHeaders: ffcapi.TransactionHeaders{
+			From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+			To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+		},
+		TransactionData: "424d426559724d4a704c577271437337555463466155514365574271736a434c6c00889816a17ae688c971be1ad34bfe1990f8fa5e0f000b0000000130a980e6e41028da2cacfca4ddefea252d18bed900ffff05706175736500000002030a",
+	}
+	resp, _, err := c.TransactionSend(ctx, req)
+	assert.Nil(t, resp)
+	assert.Error(t, err)
+}
+
+func TestTransactionSendSignTxError(t *testing.T) {
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.ContractInfo{
+			Counter: 10,
+			Manager: "edpkv89Jj4aVWetK69CWm5ss1LayvK8dQoiFz7p995y1k3E8CZwqJ6",
+		}, nil)
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(500)
+		w.Write([]byte("internal error"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionHeaders: ffcapi.TransactionHeaders{
+			From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+			To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+		},
+		TransactionData: "424d426559724d4a704c577271437337555463466155514365574271736a434c6c00889816a17ae688c971be1ad34bfe1990f8fa5e0f000b0000000130a980e6e41028da2cacfca4ddefea252d18bed900ffff05706175736500000002030a",
+	}
+	_, _, err := c.TransactionSend(ctx, req)
+	assert.Error(t, err)
+}
+
+func Test_signTxRemotelyNilOperationError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	err := c.signTxRemotely(ctx, nil)
+	assert.Error(t, err)
+}
+
+func Test_signTxRemotelyNilContextError(t *testing.T) {
+	_, c, _, done := newTestConnector(t)
+	defer done()
+
+	op := codec.NewOp()
+	op.WithSource(tezos.MustParseAddress("tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN"))
+
+	err := c.signTxRemotely(nil, op)
+	assert.Error(t, err)
+}
+
+func Test_signTxRemotelyHttpError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	op := codec.NewOp()
+	op.WithSource(tezos.MustParseAddress("tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN"))
+
+	err := c.signTxRemotely(ctx, op)
+	assert.Error(t, err)
+}
+
+func Test_signTxRemotelyHttpWrongStatusError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	op := codec.NewOp()
+	op.WithSource(tezos.MustParseAddress("tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN"))
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(500)
+		w.Write([]byte("internal error"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	err := c.signTxRemotely(ctx, op)
+	assert.Error(t, err)
+}
+
+func Test_signTxRemotelyUnmarshalRespError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	op := codec.NewOp()
+	op.WithSource(tezos.MustParseAddress("tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN"))
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write(nil)
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	err := c.signTxRemotely(ctx, op)
+	assert.Error(t, err)
+}
+
+func Test_signTxRemotelyUnmarshalSignatureError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	op := codec.NewOp()
+	op.WithSource(tezos.MustParseAddress("tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN"))
+
+	// Set up http mocks
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("{\"wrong\":\"sigWetzF5zVM2qdYt8QToj7e5cNBm9neiPRc3rpePBDrr8N1brFbErv2YfXMSoSgemJ8AwZcLfmkBDg78bmUEzF1sf1YotnS\"}"))
+	}))
+	defer svr.Close()
+	c.signatoryURL = svr.URL
+
+	err := c.signTxRemotely(ctx, op)
+	assert.Error(t, err)
+}