diff --git a/go.mod b/go.mod
index 768484b..de90535 100644
--- a/go.mod
+++ b/go.mod
@@ -19,7 +19,7 @@ require (
 	github.com/multiformats/go-multihash v0.2.3
 	github.com/storacha/go-capabilities v0.0.0-20241021134022-7144600f5aeb
 	github.com/storacha/go-metadata v0.0.0-20241021141939-f94d93dcda78
-	github.com/storacha/go-ucanto v0.1.1-0.20241028093931-42d9e1db4bfb
+	github.com/storacha/go-ucanto v0.1.1-0.20241028163940-34de8cd912bb
 	github.com/storacha/ipni-publisher v0.0.0-20241018055706-032286a2dc3f
 	github.com/stretchr/testify v1.9.0
 	github.com/urfave/cli/v2 v2.27.4
diff --git a/go.sum b/go.sum
index 2c97b14..bf0daa1 100644
--- a/go.sum
+++ b/go.sum
@@ -540,8 +540,8 @@ github.com/storacha/go-capabilities v0.0.0-20241021134022-7144600f5aeb h1:A9/44D
 github.com/storacha/go-capabilities v0.0.0-20241021134022-7144600f5aeb/go.mod h1:1x2qMcvOUvF6prSiWXsEeEfV3OcX/L2fk6iNgPMNfZU=
 github.com/storacha/go-metadata v0.0.0-20241021141939-f94d93dcda78 h1:NAti9hMLMo8F0Iyz5ldS41CY6MyukRH0OrTPV4u2340=
 github.com/storacha/go-metadata v0.0.0-20241021141939-f94d93dcda78/go.mod h1:DcwwQnyFuTk531cKD9sUkQg/gzpwKaIqH9I7oZYyeRc=
-github.com/storacha/go-ucanto v0.1.1-0.20241028093931-42d9e1db4bfb h1:bjubXTmLyLl7eap6HhIoFmwIH6H4CCtnJlcE4hbc2Qo=
-github.com/storacha/go-ucanto v0.1.1-0.20241028093931-42d9e1db4bfb/go.mod h1:7ba9jAgqmwlF/JfyFUQcGV07uiYNlmJNu8qH4hHtrJk=
+github.com/storacha/go-ucanto v0.1.1-0.20241028163940-34de8cd912bb h1:lFwFtMjgt162ot9pnu230haLjRQ1rqwJOIAyywOqAX8=
+github.com/storacha/go-ucanto v0.1.1-0.20241028163940-34de8cd912bb/go.mod h1:7ba9jAgqmwlF/JfyFUQcGV07uiYNlmJNu8qH4hHtrJk=
 github.com/storacha/ipni-publisher v0.0.0-20241018055706-032286a2dc3f h1:62fTASO3wRPCWCkl6we2DftsFy/DfbmVpwJyqK7gmUc=
 github.com/storacha/ipni-publisher v0.0.0-20241018055706-032286a2dc3f/go.mod h1:fEuGSF5WMaOSAyDQCYAvow6Y+YKzpXczEk3A+H+s1fQ=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
diff --git a/pkg/service/publisher/publisher_test.go b/pkg/service/publisher/publisher_test.go
index a8579c2..9b8658f 100644
--- a/pkg/service/publisher/publisher_test.go
+++ b/pkg/service/publisher/publisher_test.go
@@ -17,7 +17,7 @@ import (
 	"github.com/storacha/go-ucanto/client"
 	"github.com/storacha/go-ucanto/core/delegation"
 	"github.com/storacha/go-ucanto/core/invocation"
-	"github.com/storacha/go-ucanto/core/receipt"
+	"github.com/storacha/go-ucanto/core/receipt/fx"
 	"github.com/storacha/go-ucanto/core/result/ok"
 	"github.com/storacha/go-ucanto/principal"
 	"github.com/storacha/go-ucanto/server"
@@ -100,7 +100,7 @@ func TestPublisherService(t *testing.T) {
 		publisherStore := store.FromDatastore(dstore)
 
 		handlerCalled := false
-		handler := func(cap ucan.Capability[claim.CacheCaveats], inv invocation.Invocation, ctx server.InvocationContext) (ok.Unit, receipt.Effects, error) {
+		handler := func(cap ucan.Capability[claim.CacheCaveats], inv invocation.Invocation, ctx server.InvocationContext) (ok.Unit, fx.Effects, error) {
 			handlerCalled = true
 			claim := cap.Nb().Claim
 			for b, err := range inv.Blocks() {
diff --git a/pkg/service/storage/ucan.go b/pkg/service/storage/ucan.go
index 8b0d106..f931970 100644
--- a/pkg/service/storage/ucan.go
+++ b/pkg/service/storage/ucan.go
@@ -11,7 +11,7 @@ import (
 	"github.com/storacha/go-capabilities/pkg/blob"
 	"github.com/storacha/go-ucanto/core/delegation"
 	"github.com/storacha/go-ucanto/core/invocation"
-	"github.com/storacha/go-ucanto/core/receipt"
+	"github.com/storacha/go-ucanto/core/receipt/fx"
 	"github.com/storacha/go-ucanto/core/result/failure"
 	"github.com/storacha/go-ucanto/server"
 	"github.com/storacha/go-ucanto/ucan"
@@ -31,7 +31,7 @@ func NewUCANServer(storageService Service) (server.ServerView, error) {
 			blob.AllocateAbility,
 			server.Provide(
 				blob.Allocate,
-				func(cap ucan.Capability[blob.AllocateCaveats], inv invocation.Invocation, iCtx server.InvocationContext) (blob.AllocateOk, receipt.Effects, error) {
+				func(cap ucan.Capability[blob.AllocateCaveats], inv invocation.Invocation, iCtx server.InvocationContext) (blob.AllocateOk, fx.Effects, error) {
 					ctx := context.TODO()
 					digest := cap.Nb().Blob.Digest
 					log := log.With("blob", digestutil.Format(digest))
@@ -102,7 +102,7 @@ func NewUCANServer(storageService Service) (server.ServerView, error) {
 			blob.AcceptAbility,
 			server.Provide(
 				blob.Accept,
-				func(cap ucan.Capability[blob.AcceptCaveats], inv invocation.Invocation, iCtx server.InvocationContext) (blob.AcceptOk, receipt.Effects, error) {
+				func(cap ucan.Capability[blob.AcceptCaveats], inv invocation.Invocation, iCtx server.InvocationContext) (blob.AcceptOk, fx.Effects, error) {
 					ctx := context.TODO()
 					digest := cap.Nb().Blob.Digest
 					log := log.With("blob", digestutil.Format(digest))
@@ -156,7 +156,7 @@ func NewUCANServer(storageService Service) (server.ServerView, error) {
 						return blob.AcceptOk{}, nil, failure.FromError(err)
 					}
 
-					return blob.AcceptOk{Site: claim.Link()}, nil, nil
+					return blob.AcceptOk{Site: claim.Link()}, fx.NewEffects(fx.WithFork(fx.FromInvocation(claim))), nil
 				},
 			),
 		),
diff --git a/pkg/service/storage/server_test.go b/pkg/service/storage/ucan_test.go
similarity index 96%
rename from pkg/service/storage/server_test.go
rename to pkg/service/storage/ucan_test.go
index 618ea1e..1ec9227 100644
--- a/pkg/service/storage/server_test.go
+++ b/pkg/service/storage/ucan_test.go
@@ -217,5 +217,11 @@ func TestServer(t *testing.T) {
 			fmt.Println(*f.Stack)
 			require.Nil(t, f)
 		})
+
+		require.NotEmpty(t, rcpt.Fx().Fork())
+		effect := rcpt.Fx().Fork()[0]
+		claim, ok := effect.Invocation()
+		require.True(t, ok)
+		require.Equal(t, assert.LocationAbility, claim.Capabilities()[0].Can())
 	})
 }