diff --git a/actions/auction.go b/actions/auction.go
index 524a128..9052271 100644
--- a/actions/auction.go
+++ b/actions/auction.go
@@ -2,6 +2,7 @@ package actions
 
 import (
 	"context"
+	"crypto/sha256"
 	"encoding/binary"
 	"fmt"
 
@@ -25,6 +26,14 @@ type AuctionInfo struct {
 	BuilderSEQAddress codec.Address `json:"builderSEQAddress"`
 }
 
+func (a *AuctionInfo) HashAuctionInfo() ([32]byte, error) {
+	msg := binary.BigEndian.AppendUint64(nil, a.EpochNumber)
+	msg = binary.BigEndian.AppendUint64(msg, a.BidPrice)
+	msg = append(msg, a.BuilderSEQAddress[:]...)
+	hash := sha256.Sum256(msg)
+	return hash, nil
+}
+
 func (info *AuctionInfo) Marshal(p *codec.Packer) {
 	p.PackUint64(info.EpochNumber)
 	p.PackUint64(info.BidPrice)
@@ -90,17 +99,18 @@ func (a *Auction) Execute(
 		return nil, fmt.Errorf("failed to parse public key: %w", err)
 	}
 
-	msg := make([]byte, 16)
-	binary.BigEndian.PutUint64(msg[:8], a.AuctionInfo.EpochNumber)
-	binary.BigEndian.PutUint64(msg[8:], a.AuctionInfo.BidPrice)
-	msg = append(msg, a.AuctionInfo.BuilderSEQAddress[:]...)
+	digest, err := a.AuctionInfo.HashAuctionInfo()
+	if err != nil {
+		return nil, fmt.Errorf("unable to hash auction info")
+	}
+
 	sig, err := bls.SignatureFromBytes(a.BuilderSignature)
 	if err != nil {
 		return nil, fmt.Errorf("failed to parse signature: %w", err)
 	}
 
 	// Verify the signature.
-	if !bls.Verify(msg, pubkey, sig) {
+	if !bls.Verify(digest[:], pubkey, sig) {
 		return nil, ErrInvalidBidderSignature
 	}
 
diff --git a/go.mod b/go.mod
index 25f24fa..910cccc 100644
--- a/go.mod
+++ b/go.mod
@@ -173,4 +173,4 @@ require (
 
 // replace github.com/ava-labs/coreth => github.com/AnomalyFi/coreth v0.12.5-rc.6.1
 
-// replace github.com/AnomalyFi/hypersdk => ../hypersdk
+replace github.com/AnomalyFi/hypersdk => ../hypersdk
diff --git a/go.sum b/go.sum
index ea75598..c4e7b93 100644
--- a/go.sum
+++ b/go.sum
@@ -39,10 +39,6 @@ dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7
 filippo.io/edwards25519 v1.0.0 h1:0wAIcmJUqRdI8IJ/3eGi5/HwXZWPujYXXlkrQogz0Ek=
 filippo.io/edwards25519 v1.0.0/go.mod h1:N1IkdkCkiLB6tki+MYJoSx2JTY9NUlxZE7eHn5EwJns=
 github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
-github.com/AnomalyFi/hypersdk v0.9.7-arcadia.13 h1:jZJXZpW6gQkfH0draUp5fQLwCfKzRYhNLHDxz33ncOs=
-github.com/AnomalyFi/hypersdk v0.9.7-arcadia.13/go.mod h1:0Vj2PdwSFN7pat4Sno39IfmtOiv/gO9mxZXyRKnoKtI=
-github.com/AnomalyFi/hypersdk v0.9.7-arcadia.14 h1:mDlxazNtWWHV4sb+j9G/Aw6DW4WA1zcNLM2B6ZoYA8s=
-github.com/AnomalyFi/hypersdk v0.9.7-arcadia.14/go.mod h1:0Vj2PdwSFN7pat4Sno39IfmtOiv/gO9mxZXyRKnoKtI=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
diff --git a/rpc/jsonrpc_server.go b/rpc/jsonrpc_server.go
index 677f197..4931399 100644
--- a/rpc/jsonrpc_server.go
+++ b/rpc/jsonrpc_server.go
@@ -399,6 +399,10 @@ func (j *JSONRPCServer) GetRollupInfo(req *http.Request, args *types.GetRollupIn
 	if err != nil {
 		return err
 	}
+	if info == nil {
+		return fmt.Errorf("not such rollup in state")
+	}
+
 	reply.Info = *info
 	return nil
 }
diff --git a/scripts/run.sh b/scripts/run.sh
index 5759366..17d310c 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -136,11 +136,14 @@ find "${TMPDIR}"/avalanchego-"${VERSION}"
 # if you are starting your own devnet (otherwise anyone can access
 # funds using the included demo.pk)
 # total stake can allocate: 10000000000000000000, make sure it is below this or genesis won't load
+# builder address: seq1qxg2p2au72mweweuyu3dx8dhla6gyky630azwsvnc69tvg0m6qx9uqms9wx
+# opnode address: seq1qy94dndd0wzru9gvq3ayw52ngcd2fuhyptt58f4a3eppjzpx573qg9cr7sm
 echo "creating allocations file"
 cat <<EOF > "${TMPDIR}"/allocations.json
 [
   {"address":"${ADDRESS}", "balance":1000000000000000000},
-  {"address":"seq1qy94dndd0wzru9gvq3ayw52ngcd2fuhyptt58f4a3eppjzpx573qg9cr7sm", "balance":1000000000000000000}
+  {"address":"seq1qy94dndd0wzru9gvq3ayw52ngcd2fuhyptt58f4a3eppjzpx573qg9cr7sm", "balance":1000000000000000000},
+  {"address":"seq1qxg2p2au72mweweuyu3dx8dhla6gyky630azwsvnc69tvg0m6qx9uqms9wx", "balance":1000000000000000000}
 ]
 EOF