diff --git a/internal/osnadmin/fetch.go b/internal/osnadmin/fetch.go
new file mode 100644
index 0000000..b43fcba
--- /dev/null
+++ b/internal/osnadmin/fetch.go
@@ -0,0 +1,42 @@
+package osnadmin
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/hyperledger/fabric-protos-go-apiv2/common"
+	"google.golang.org/protobuf/proto"
+)
+
+func Fetch(ctx context.Context, osnURL, channelID string, blockID string, caCertPool *x509.CertPool, tlsClientCert tls.Certificate) (*common.Block, error) {
+	url := fmt.Sprintf("%s/participation/v1/channels/%s/blocks/%s", osnURL, channelID, blockID)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("create request: %w", err)
+	}
+
+	resp, err := httpDo(req, caCertPool, tlsClientCert)
+	if err != nil {
+		return nil, fmt.Errorf("process request: %w", err)
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("read response body: %w", err)
+	}
+
+	var block common.Block
+	if err := proto.Unmarshal(body, &block); err != nil {
+		return nil, fmt.Errorf("unmarshal response body: %w", err)
+	}
+	return &block, nil
+}
diff --git a/internal/osnadmin/update.go b/internal/osnadmin/update.go
new file mode 100644
index 0000000..df8e987
--- /dev/null
+++ b/internal/osnadmin/update.go
@@ -0,0 +1,48 @@
+package osnadmin
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"mime/multipart"
+	"net/http"
+)
+
+// Update channel configuration using presented config envelope.
+func Update(ctx context.Context, osnURL, channelID string, caCertPool *x509.CertPool, tlsClientCert tls.Certificate, configEnvelope []byte) (*http.Response, error) {
+	url := osnURL + "/participation/v1/channels"
+
+	req, err := createUpdateRequest(ctx, url, configEnvelope)
+	if err != nil {
+		return nil, fmt.Errorf("create update request: %w", err)
+	}
+
+	return httpDo(req, caCertPool, tlsClientCert)
+}
+
+func createUpdateRequest(ctx context.Context, url string, configEnvelope []byte) (*http.Request, error) {
+	joinBody := new(bytes.Buffer)
+	writer := multipart.NewWriter(joinBody)
+	part, err := writer.CreateFormFile("config-update-envelope", "config_update.pb")
+	if err != nil {
+		return nil, err
+	}
+	_, err = part.Write(configEnvelope)
+	if err != nil {
+		return nil, err
+	}
+	err = writer.Close()
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPut, url, joinBody)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+
+	return req, nil
+}
diff --git a/pkg/channel/block.go b/pkg/channel/block.go
index aac92ca..e4b6678 100644
--- a/pkg/channel/block.go
+++ b/pkg/channel/block.go
@@ -2,8 +2,11 @@ package channel
 
 import (
 	"context"
+	"crypto/tls"
+	"crypto/x509"
 	"fmt"
 
+	"github.com/hyperledger/fabric-admin-sdk/internal/osnadmin"
 	"github.com/hyperledger/fabric-admin-sdk/pkg/identity"
 	"github.com/hyperledger/fabric-admin-sdk/pkg/internal/proposal"
 
@@ -61,3 +64,7 @@ func getSignedProposal(ctx context.Context, connection grpc.ClientConnInterface,
 
 	return proposalResp, nil
 }
+
+func GetBlock(ctx context.Context, osnURL, channelID, blockID string, caCertPool *x509.CertPool, tlsClientCert tls.Certificate) (*cb.Block, error) {
+	return osnadmin.Fetch(ctx, osnURL, channelID, blockID, caCertPool, tlsClientCert)
+}
diff --git a/pkg/channel/channel.go b/pkg/channel/channel.go
index db1bdf8..0c47fac 100644
--- a/pkg/channel/channel.go
+++ b/pkg/channel/channel.go
@@ -13,9 +13,9 @@ import (
 	"github.com/hyperledger/fabric-admin-sdk/internal/protoutil"
 	"github.com/hyperledger/fabric-admin-sdk/pkg/identity"
 	"github.com/hyperledger/fabric-admin-sdk/pkg/internal/proposal"
-	"github.com/hyperledger/fabric-protos-go-apiv2/peer"
 
 	cb "github.com/hyperledger/fabric-protos-go-apiv2/common"
+	"github.com/hyperledger/fabric-protos-go-apiv2/peer"
 	"google.golang.org/grpc"
 	"google.golang.org/protobuf/proto"
 )
@@ -110,3 +110,8 @@ func ListChannelOnPeer(ctx context.Context, connection grpc.ClientConnInterface,
 	}
 	return channelQueryResponse.GetChannels(), nil
 }
+
+func UpdateChannel(ctx context.Context, osnURL string, caCertPool *x509.CertPool, tlsClientCert tls.Certificate, channelName string, env *cb.Envelope) (*http.Response, error) {
+	envelopeBytes := protoutil.MarshalOrPanic(env)
+	return osnadmin.Update(ctx, osnURL, channelName, caCertPool, tlsClientCert, envelopeBytes)
+}