diff --git a/chain/gen/mining.go b/chain/gen/mining.go
index 1fc27ec5c..d0d454fdf 100644
--- a/chain/gen/mining.go
+++ b/chain/gen/mining.go
@@ -153,13 +153,21 @@ func aggregateSignatures(sigs []crypto.Signature) (*crypto.Signature, error) {
 			return nil, xerrors.Errorf("bls.Aggregate returned nil with %d signatures", len(sigs))
 		}
 
-		// Note: for blst this condition should not happen - nil should not be returned
+		// Note: for blst this condition should not happen - nil should not
+		// be returned
 		return &crypto.Signature{
 			Type: crypto.SigTypeBLS,
 			Data: new(bls.Signature).Compress(),
 		}, nil
 	}
-	aggSig := aggregator.ToAffine().Compress()
+	aggSigAff := aggregator.ToAffine()
+	if aggSigAff == nil {
+		return &crypto.Signature{
+			Type: crypto.SigTypeBLS,
+			Data: new(bls.Signature).Compress(),
+		}, nil
+	}
+	aggSig := aggSigAff.Compress()
 	return &crypto.Signature{
 		Type: crypto.SigTypeBLS,
 		Data: aggSig,
diff --git a/chain/sync.go b/chain/sync.go
index 8459d4b94..6917cba98 100644
--- a/chain/sync.go
+++ b/chain/sync.go
@@ -25,7 +25,6 @@ import (
 	"go.opencensus.io/trace"
 	"golang.org/x/xerrors"
 
-	blst "github.com/supranational/blst/bindings/go"
 	"github.com/filecoin-project/go-address"
 	amt "github.com/filecoin-project/go-amt-ipld/v2"
 	"github.com/filecoin-project/sector-storage/ffiwrapper"
@@ -34,6 +33,7 @@ import (
 	"github.com/filecoin-project/specs-actors/actors/builtin/power"
 	"github.com/filecoin-project/specs-actors/actors/crypto"
 	"github.com/filecoin-project/specs-actors/actors/util/adt"
+	blst "github.com/supranational/blst/bindings/go"
 
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/build"
diff --git a/go.mod b/go.mod
index 87901d1a2..0e29613ed 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,8 @@ module github.com/filecoin-project/lotus
 
 go 1.14
 
+replace github.com/supranational/blst => github.com/supranational/blst v0.1.2-alpha.1
+
 require (
 	contrib.go.opencensus.io/exporter/jaeger v0.1.0
 	contrib.go.opencensus.io/exporter/prometheus v0.1.0
@@ -119,7 +121,7 @@ require (
 	go.uber.org/multierr v1.5.0
 	go.uber.org/zap v1.15.0
 	go4.org v0.0.0-20190313082347-94abd6928b1d // indirect
-	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
+	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
 	golang.org/x/sys v0.0.0-20200602225109-6fdc65e7d980
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0
 	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
diff --git a/go.sum b/go.sum
index f7b825211..8ca92405b 100644
--- a/go.sum
+++ b/go.sum
@@ -1316,10 +1316,8 @@ github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5
 github.com/stretchr/testify v1.6.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/supranational/blst v0.1.0 h1:2LzeBbOidhTD87UezqGvIffWZAd3FOCfhi2b7IbJCMc=
-github.com/supranational/blst v0.1.0/go.mod h1:Z70pOaiBHpXP+JFNOwIyCHKjec/He56CC5UdLaYpuzY=
-github.com/supranational/blst v0.1.1 h1:GsK4oq7QZ7yfHI6dCh2NQsUe4imjlFwm5NXF5PWAWoo=
-github.com/supranational/blst v0.1.1/go.mod h1:jZJtfjgudtNl4en1tzwPIV3KjUnQUvG3/j+w+fVonLw=
+github.com/supranational/blst v0.1.2-alpha.1 h1:v0UqVlvbRNZIaSeMPr+T01kvTUq1h0EZuZ6gnDR1Mlg=
+github.com/supranational/blst v0.1.2-alpha.1/go.mod h1:jZJtfjgudtNl4en1tzwPIV3KjUnQUvG3/j+w+fVonLw=
 github.com/syndtr/goleveldb v1.0.0 h1:fBdIW9lB4Iz0n9khmH8w27SJ3QEJ7+IgjPEwGSZiFdE=
 github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA=
@@ -1567,6 +1565,8 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a h1:WXEvlFVvvGxCJLG6REjsT03iWnKLEWinaScsxF2Vm2o=
 golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208 h1:qwRHBd0NqMbJxfbotnDhm2ByMI1Shq4Y6oRJo21SGJA=
+golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180202135801-37707fdb30a5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
diff --git a/lib/sigs/bls/init.go b/lib/sigs/bls/init.go
index 9876827a4..c63cf0b65 100644
--- a/lib/sigs/bls/init.go
+++ b/lib/sigs/bls/init.go
@@ -28,21 +28,22 @@ func (blsSigner) GenPrivate() ([]byte, error) {
 	if err != nil {
 		return nil, fmt.Errorf("bls signature error generating random data")
 	}
-	pk := blst.KeyGen(ikm[:]).Serialize()
+	// Note private keys seem to be serialized little-endian!
+	pk := blst.KeyGen(ikm[:]).ToLEndian()
 	return pk, nil
 }
 
 func (blsSigner) ToPublic(priv []byte) ([]byte, error) {
-	pk := new(SecretKey).Deserialize(priv)
-	if pk == nil {
+	pk := new(SecretKey).FromLEndian(priv)
+	if pk == nil || !pk.Valid() {
 		return nil, fmt.Errorf("bls signature invalid private key")
 	}
 	return new(PublicKey).From(pk).Compress(), nil
 }
 
 func (blsSigner) Sign(p []byte, msg []byte) ([]byte, error) {
-	pk := new(SecretKey).Deserialize(p)
-	if pk == nil {
+	pk := new(SecretKey).FromLEndian(p)
+	if pk == nil || !pk.Valid() {
 		return nil, fmt.Errorf("bls signature invalid private key")
 	}
 	return new(Signature).Sign(pk, msg, []byte(DST)).Compress(), nil