diff --git a/api/api_gateway.go b/api/api_gateway.go
index 29cd8ce24..862c6ddb5 100644
--- a/api/api_gateway.go
+++ b/api/api_gateway.go
@@ -33,6 +33,7 @@ type Gateway interface {
 	ChainHead(ctx context.Context) (*types.TipSet, error)
 	ChainGetBlockMessages(context.Context, cid.Cid) (*BlockMessages, error)
 	ChainGetMessage(ctx context.Context, mc cid.Cid) (*types.Message, error)
+	ChainGetPath(ctx context.Context, from, to types.TipSetKey) ([]*HeadChange, error)
 	ChainGetTipSet(ctx context.Context, tsk types.TipSetKey) (*types.TipSet, error)
 	ChainGetTipSetByHeight(ctx context.Context, h abi.ChainEpoch, tsk types.TipSetKey) (*types.TipSet, error)
 	ChainGetTipSetAfterHeight(ctx context.Context, h abi.ChainEpoch, tsk types.TipSetKey) (*types.TipSet, error)
diff --git a/api/proxy_gen.go b/api/proxy_gen.go
index f2dc7c560..c03b83531 100644
--- a/api/proxy_gen.go
+++ b/api/proxy_gen.go
@@ -480,6 +480,8 @@ type GatewayStruct struct {
 
 		ChainGetMessage func(p0 context.Context, p1 cid.Cid) (*types.Message, error) ``
 
+		ChainGetPath func(p0 context.Context, p1 types.TipSetKey, p2 types.TipSetKey) ([]*HeadChange, error) ``
+
 		ChainGetTipSet func(p0 context.Context, p1 types.TipSetKey) (*types.TipSet, error) ``
 
 		ChainGetTipSetAfterHeight func(p0 context.Context, p1 abi.ChainEpoch, p2 types.TipSetKey) (*types.TipSet, error) ``
@@ -3039,6 +3041,17 @@ func (s *GatewayStub) ChainGetMessage(p0 context.Context, p1 cid.Cid) (*types.Me
 	return nil, ErrNotSupported
 }
 
+func (s *GatewayStruct) ChainGetPath(p0 context.Context, p1 types.TipSetKey, p2 types.TipSetKey) ([]*HeadChange, error) {
+	if s.Internal.ChainGetPath == nil {
+		return *new([]*HeadChange), ErrNotSupported
+	}
+	return s.Internal.ChainGetPath(p0, p1, p2)
+}
+
+func (s *GatewayStub) ChainGetPath(p0 context.Context, p1 types.TipSetKey, p2 types.TipSetKey) ([]*HeadChange, error) {
+	return *new([]*HeadChange), ErrNotSupported
+}
+
 func (s *GatewayStruct) ChainGetTipSet(p0 context.Context, p1 types.TipSetKey) (*types.TipSet, error) {
 	if s.Internal.ChainGetTipSet == nil {
 		return nil, ErrNotSupported
diff --git a/build/openrpc/full.json.gz b/build/openrpc/full.json.gz
index 4892e0901..610a0591a 100644
Binary files a/build/openrpc/full.json.gz and b/build/openrpc/full.json.gz differ
diff --git a/build/openrpc/miner.json.gz b/build/openrpc/miner.json.gz
index b119be722..ce3a4562f 100644
Binary files a/build/openrpc/miner.json.gz and b/build/openrpc/miner.json.gz differ
diff --git a/build/openrpc/worker.json.gz b/build/openrpc/worker.json.gz
index 06d91c92a..84b1b1b1d 100644
Binary files a/build/openrpc/worker.json.gz and b/build/openrpc/worker.json.gz differ
diff --git a/build/params_2k.go b/build/params_2k.go
index efa38dc0c..479bd3b82 100644
--- a/build/params_2k.go
+++ b/build/params_2k.go
@@ -1,3 +1,4 @@
+//go:build debug || 2k
 // +build debug 2k
 
 package build
diff --git a/build/params_butterfly.go b/build/params_butterfly.go
index 4f4cc756d..1477c363a 100644
--- a/build/params_butterfly.go
+++ b/build/params_butterfly.go
@@ -1,3 +1,4 @@
+//go:build butterflynet
 // +build butterflynet
 
 package build
diff --git a/build/params_calibnet.go b/build/params_calibnet.go
index df334a516..bafed3015 100644
--- a/build/params_calibnet.go
+++ b/build/params_calibnet.go
@@ -1,3 +1,4 @@
+//go:build calibnet
 // +build calibnet
 
 package build
diff --git a/build/params_debug.go b/build/params_debug.go
index f679c9178..e977cda05 100644
--- a/build/params_debug.go
+++ b/build/params_debug.go
@@ -1,3 +1,4 @@
+//go:build debug
 // +build debug
 
 package build
diff --git a/build/params_interop.go b/build/params_interop.go
index 921dd0981..0040bb9d0 100644
--- a/build/params_interop.go
+++ b/build/params_interop.go
@@ -1,3 +1,4 @@
+//go:build interopnet
 // +build interopnet
 
 package build
diff --git a/build/params_mainnet.go b/build/params_mainnet.go
index 1c9b69462..1e9996082 100644
--- a/build/params_mainnet.go
+++ b/build/params_mainnet.go
@@ -1,10 +1,5 @@
-// +build !debug
-// +build !2k
-// +build !testground
-// +build !calibnet
-// +build !nerpanet
-// +build !butterflynet
-// +build !interopnet
+//go:build !debug && !2k && !testground && !calibnet && !nerpanet && !butterflynet && !interopnet
+// +build !debug,!2k,!testground,!calibnet,!nerpanet,!butterflynet,!interopnet
 
 package build
 
diff --git a/build/params_nerpanet.go b/build/params_nerpanet.go
index 5eef25cb2..b7beb5953 100644
--- a/build/params_nerpanet.go
+++ b/build/params_nerpanet.go
@@ -1,3 +1,4 @@
+//go:build nerpanet
 // +build nerpanet
 
 package build
diff --git a/build/params_shared_vals.go b/build/params_shared_vals.go
index db198e4aa..f3b6cb6a2 100644
--- a/build/params_shared_vals.go
+++ b/build/params_shared_vals.go
@@ -1,3 +1,4 @@
+//go:build !testground
 // +build !testground
 
 package build
diff --git a/build/params_testground.go b/build/params_testground.go
index 204c74e67..0bb984a27 100644
--- a/build/params_testground.go
+++ b/build/params_testground.go
@@ -1,3 +1,4 @@
+//go:build testground
 // +build testground
 
 // This file makes hardcoded parameters (const) configurable as vars.
diff --git a/build/tools.go b/build/tools.go
index 57b6e7d1f..adebe34dd 100644
--- a/build/tools.go
+++ b/build/tools.go
@@ -1,4 +1,5 @@
-//+build tools
+//go:build tools
+// +build tools
 
 package build
 
diff --git a/chain/types/message_fuzz.go b/chain/types/message_fuzz.go
index 4ef5f6ba2..b57bfe452 100644
--- a/chain/types/message_fuzz.go
+++ b/chain/types/message_fuzz.go
@@ -1,4 +1,5 @@
-//+build gofuzz
+//go:build gofuzz
+// +build gofuzz
 
 package types
 
diff --git a/cmd/lotus/daemon.go b/cmd/lotus/daemon.go
index 31fc738e5..6aa62be51 100644
--- a/cmd/lotus/daemon.go
+++ b/cmd/lotus/daemon.go
@@ -1,3 +1,4 @@
+//go:build !nodaemon
 // +build !nodaemon
 
 package main
diff --git a/cmd/lotus/daemon_nodaemon.go b/cmd/lotus/daemon_nodaemon.go
index a11d92c6c..7cf12dac4 100644
--- a/cmd/lotus/daemon_nodaemon.go
+++ b/cmd/lotus/daemon_nodaemon.go
@@ -1,3 +1,4 @@
+//go:build nodaemon
 // +build nodaemon
 
 package main
diff --git a/cmd/lotus/debug_advance.go b/cmd/lotus/debug_advance.go
index 4e74a995f..8af4f3660 100644
--- a/cmd/lotus/debug_advance.go
+++ b/cmd/lotus/debug_advance.go
@@ -1,3 +1,4 @@
+//go:build debug
 // +build debug
 
 package main
diff --git a/extern/sector-storage/ffiwrapper/prover_cgo.go b/extern/sector-storage/ffiwrapper/prover_cgo.go
index 3ad73c81c..1ca22083d 100644
--- a/extern/sector-storage/ffiwrapper/prover_cgo.go
+++ b/extern/sector-storage/ffiwrapper/prover_cgo.go
@@ -1,4 +1,5 @@
-//+build cgo
+//go:build cgo
+// +build cgo
 
 package ffiwrapper
 
diff --git a/extern/sector-storage/ffiwrapper/sealer_cgo.go b/extern/sector-storage/ffiwrapper/sealer_cgo.go
index 820c53c4b..59770ec9a 100644
--- a/extern/sector-storage/ffiwrapper/sealer_cgo.go
+++ b/extern/sector-storage/ffiwrapper/sealer_cgo.go
@@ -1,4 +1,5 @@
-//+build cgo
+//go:build cgo
+// +build cgo
 
 package ffiwrapper
 
diff --git a/extern/sector-storage/ffiwrapper/verifier_cgo.go b/extern/sector-storage/ffiwrapper/verifier_cgo.go
index 95724bb7c..ff35ddc1f 100644
--- a/extern/sector-storage/ffiwrapper/verifier_cgo.go
+++ b/extern/sector-storage/ffiwrapper/verifier_cgo.go
@@ -1,4 +1,5 @@
-//+build cgo
+//go:build cgo
+// +build cgo
 
 package ffiwrapper
 
diff --git a/extern/sector-storage/fsutil/dealloc_other.go b/extern/sector-storage/fsutil/dealloc_other.go
index 4f8347951..ff373d97d 100644
--- a/extern/sector-storage/fsutil/dealloc_other.go
+++ b/extern/sector-storage/fsutil/dealloc_other.go
@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package fsutil
diff --git a/gateway/node.go b/gateway/node.go
index 84b616f26..69a9d8731 100644
--- a/gateway/node.go
+++ b/gateway/node.go
@@ -40,6 +40,7 @@ type TargetAPI interface {
 	ChainHasObj(context.Context, cid.Cid) (bool, error)
 	ChainHead(ctx context.Context) (*types.TipSet, error)
 	ChainNotify(context.Context) (<-chan []*api.HeadChange, error)
+	ChainGetPath(ctx context.Context, from, to types.TipSetKey) ([]*api.HeadChange, error)
 	ChainReadObj(context.Context, cid.Cid) ([]byte, error)
 	GasEstimateMessageGas(ctx context.Context, msg *types.Message, spec *api.MessageSendSpec, tsk types.TipSetKey) (*types.Message, error)
 	MpoolPushUntrusted(ctx context.Context, sm *types.SignedMessage) (cid.Cid, error)
@@ -216,6 +217,10 @@ func (gw *Node) ChainNotify(ctx context.Context) (<-chan []*api.HeadChange, erro
 	return gw.target.ChainNotify(ctx)
 }
 
+func (gw *Node) ChainGetPath(ctx context.Context, from, to types.TipSetKey) ([]*api.HeadChange, error) {
+	return gw.target.ChainGetPath(ctx, from, to)
+}
+
 func (gw *Node) ChainReadObj(ctx context.Context, c cid.Cid) ([]byte, error) {
 	return gw.target.ChainReadObj(ctx, c)
 }
diff --git a/lib/ulimit/ulimit_freebsd.go b/lib/ulimit/ulimit_freebsd.go
index 7e50436f3..a5ff35707 100644
--- a/lib/ulimit/ulimit_freebsd.go
+++ b/lib/ulimit/ulimit_freebsd.go
@@ -1,3 +1,4 @@
+//go:build freebsd
 // +build freebsd
 
 package ulimit
diff --git a/lib/ulimit/ulimit_test.go b/lib/ulimit/ulimit_test.go
index ad27a163a..ecd777e3d 100644
--- a/lib/ulimit/ulimit_test.go
+++ b/lib/ulimit/ulimit_test.go
@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package ulimit
diff --git a/lib/ulimit/ulimit_unix.go b/lib/ulimit/ulimit_unix.go
index a351236dc..ac9f4ca90 100644
--- a/lib/ulimit/ulimit_unix.go
+++ b/lib/ulimit/ulimit_unix.go
@@ -1,3 +1,4 @@
+//go:build darwin || linux || netbsd || openbsd
 // +build darwin linux netbsd openbsd
 
 package ulimit