diff --git a/Makefile b/Makefile
index aa7575698a8..98f9d2f2c35 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,9 @@ debug: lotus lotus-miner lotus-worker lotus-seed
 2k: GOFLAGS+=-tags=2k
 2k: lotus lotus-miner lotus-worker lotus-seed
 
+calibnet: GOFLAGS+=-tags=calibnet
+calibnet: lotus lotus-miner lotus-worker lotus-seed
+
 lotus: $(BUILD_DEPS)
 	rm -f lotus
 	go build $(GOFLAGS) -o lotus ./cmd/lotus
diff --git a/build/bootstrap.go b/build/bootstrap.go
index 80c1529ff6c..98a3f5b0a22 100644
--- a/build/bootstrap.go
+++ b/build/bootstrap.go
@@ -2,11 +2,9 @@ package build
 
 import (
 	"context"
-	"os"
 	"strings"
 
 	"github.com/filecoin-project/lotus/lib/addrutil"
-	"golang.org/x/xerrors"
 
 	rice "github.com/GeertJohan/go.rice"
 	"github.com/libp2p/go-libp2p-core/peer"
@@ -17,24 +15,12 @@ func BuiltinBootstrap() ([]peer.AddrInfo, error) {
 		return nil, nil
 	}
 
-	var out []peer.AddrInfo
-
 	b := rice.MustFindBox("bootstrap")
-	err := b.Walk("", func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return xerrors.Errorf("failed to walk box: %w", err)
-		}
 
-		if !strings.HasSuffix(path, ".pi") {
-			return nil
-		}
-		spi := b.MustString(path)
-		if spi == "" {
-			return nil
-		}
-		pi, err := addrutil.ParseAddresses(context.TODO(), strings.Split(strings.TrimSpace(spi), "\n"))
-		out = append(out, pi...)
-		return err
-	})
-	return out, err
+	spi := b.MustString(BootstrappersFile)
+	if spi == "" {
+		return nil, nil
+	}
+
+	return addrutil.ParseAddresses(context.TODO(), strings.Split(strings.TrimSpace(spi), "\n"))
 }
diff --git a/build/bootstrap/calibnet.pi b/build/bootstrap/calibnet.pi
new file mode 100644
index 00000000000..cb3a2efbd1e
--- /dev/null
+++ b/build/bootstrap/calibnet.pi
@@ -0,0 +1,4 @@
+/dns4/bootstrap-0.calibration.fildev.network/tcp/1347/p2p/12D3KooWK1QYsm6iqyhgH7vqsbeoNoKHbT368h1JLHS1qYN36oyc
+/dns4/bootstrap-1.calibration.fildev.network/tcp/1347/p2p/12D3KooWKDyJZoPsNak1iYNN1GGmvGnvhyVbWBL6iusYfP3RpgYs
+/dns4/bootstrap-2.calibration.fildev.network/tcp/1347/p2p/12D3KooWJRSTnzABB6MYYEBbSTT52phQntVD1PpRTMh1xt9mh6yH
+/dns4/bootstrap-3.calibration.fildev.network/tcp/1347/p2p/12D3KooWQLi3kY6HnMYLUtwCe26zWMdNhniFgHVNn1DioQc7NiWv
diff --git a/build/bootstrap/bootstrappers.pi b/build/bootstrap/mainnet.pi
similarity index 100%
rename from build/bootstrap/bootstrappers.pi
rename to build/bootstrap/mainnet.pi
diff --git a/build/genesis.go b/build/genesis.go
index dc4ded27365..812f5a9df67 100644
--- a/build/genesis.go
+++ b/build/genesis.go
@@ -14,7 +14,7 @@ func MaybeGenesis() []byte {
 		log.Warnf("loading built-in genesis: %s", err)
 		return nil
 	}
-	genBytes, err := builtinGen.Bytes("devnet.car")
+	genBytes, err := builtinGen.Bytes(GenesisFile)
 	if err != nil {
 		log.Warnf("loading built-in genesis: %s", err)
 	}
diff --git a/build/genesis/calibnet.car b/build/genesis/calibnet.car
new file mode 100644
index 00000000000..f8af3987840
Binary files /dev/null and b/build/genesis/calibnet.car differ
diff --git a/build/genesis/devnet.car b/build/genesis/mainnet.car
similarity index 100%
rename from build/genesis/devnet.car
rename to build/genesis/mainnet.car
diff --git a/build/params_2k.go b/build/params_2k.go
index 11267db6f27..ecac8698339 100644
--- a/build/params_2k.go
+++ b/build/params_2k.go
@@ -7,6 +7,9 @@ import (
 	"github.com/filecoin-project/lotus/chain/actors/policy"
 )
 
+const BootstrappersFile = ""
+const GenesisFile = ""
+
 const UpgradeBreezeHeight = -1
 const BreezeGasTampingDuration = 0
 
diff --git a/build/params_calibnet.go b/build/params_calibnet.go
new file mode 100644
index 00000000000..28667cfd2c4
--- /dev/null
+++ b/build/params_calibnet.go
@@ -0,0 +1,64 @@
+// +build calibnet
+
+package build
+
+import (
+	"github.com/filecoin-project/go-address"
+	"github.com/filecoin-project/go-state-types/abi"
+	"github.com/filecoin-project/lotus/chain/actors/policy"
+	builtin2 "github.com/filecoin-project/specs-actors/v2/actors/builtin"
+)
+
+var DrandSchedule = map[abi.ChainEpoch]DrandEnum{
+	0: DrandMainnet,
+}
+
+const BootstrappersFile = "calibnet.pi"
+const GenesisFile = "calibnet.car"
+
+const UpgradeBreezeHeight = -1
+const BreezeGasTampingDuration = 120
+
+const UpgradeSmokeHeight = -2
+
+const UpgradeIgnitionHeight = -3
+const UpgradeRefuelHeight = -4
+
+var UpgradeActorsV2Height = abi.ChainEpoch(30)
+
+const UpgradeTapeHeight = 60
+
+// This signals our tentative epoch for mainnet launch. Can make it later, but not earlier.
+// Miners, clients, developers, custodians all need time to prepare.
+// We still have upgrades and state changes to do, but can happen after signaling timing here.
+const UpgradeLiftoffHeight = -5
+
+const UpgradeKumquatHeight = 90
+
+const UpgradeCalicoHeight = 92000
+const UpgradePersianHeight = UpgradeCalicoHeight + (builtin2.EpochsInHour * 60)
+
+// 2020-12-17T19:00:00Z
+const UpgradeClausHeight = 161386
+
+const UpgradeOrangeHeight = 9999999
+
+func init() {
+	policy.SetConsensusMinerMinPower(abi.NewStoragePower(10 << 30))
+	policy.SetSupportedProofTypes(
+		abi.RegisteredSealProof_StackedDrg512MiBV1,
+		abi.RegisteredSealProof_StackedDrg32GiBV1,
+		abi.RegisteredSealProof_StackedDrg64GiBV1,
+	)
+
+	SetAddressNetwork(address.Testnet)
+
+	Devnet = true
+}
+
+const BlockDelaySecs = uint64(builtin2.EpochDurationSeconds)
+
+const PropagationDelaySecs = uint64(6)
+
+// BootstrapPeerThreshold is the minimum number peers we need to track for a sync worker to start
+const BootstrapPeerThreshold = 4
diff --git a/build/params_mainnet.go b/build/params_mainnet.go
index 5f23b9b1efe..a4c3ab04ff3 100644
--- a/build/params_mainnet.go
+++ b/build/params_mainnet.go
@@ -1,6 +1,7 @@
 // +build !debug
 // +build !2k
 // +build !testground
+// +build !calibnet
 
 package build
 
@@ -18,7 +19,11 @@ var DrandSchedule = map[abi.ChainEpoch]DrandEnum{
 	UpgradeSmokeHeight: DrandMainnet,
 }
 
+const BootstrappersFile = "mainnet.pi"
+const GenesisFile = "mainnet.car"
+
 const UpgradeBreezeHeight = 41280
+
 const BreezeGasTampingDuration = 120
 
 const UpgradeSmokeHeight = 51000
diff --git a/build/params_testground.go b/build/params_testground.go
index d0e54e3f254..e78545ba840 100644
--- a/build/params_testground.go
+++ b/build/params_testground.go
@@ -102,6 +102,9 @@ var (
 
 	Devnet      = true
 	ZeroAddress = MustParseAddress("f3yaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaby2smx7a")
+
+	BootstrappersFile = ""
+	GenesisFile       = ""
 )
 
 const BootstrapPeerThreshold = 1