diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4715724..58899e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## v1.19.2
+* Update Parisnet hash
+* Update protocol history of ghostnet
+
+## v1.19.1
+* Update Paris protocol to [ParisB2](https://research-development.nomadic-labs.com/parisB2-announcement.html)
+
 ## v1.19.0
 
 * BREAKING CHANGE: The cannonical import part has been changed from `blockwatch.cc` to `github.com/trilitech`
diff --git a/examples/contract/main.go b/examples/contract/main.go
index 48f52c1..2b61d98 100644
--- a/examples/contract/main.go
+++ b/examples/contract/main.go
@@ -436,7 +436,7 @@ func balance_of(ctx context.Context, c *rpc.Client, addr, owner, id string) erro
 		return err
 	}
 	req := []contract.FA2BalanceRequest{
-		contract.FA2BalanceRequest{
+		{
 			Owner:   own,
 			TokenId: tezos.NewZ(i),
 		},
diff --git a/examples/tzgen/FA2NFT.go b/examples/tzgen/FA2NFT.go
index 6f3fce6..6e4c266 100644
--- a/examples/tzgen/FA2NFT.go
+++ b/examples/tzgen/FA2NFT.go
@@ -10,12 +10,12 @@ import (
 	"math/big"
 	"time"
 
+	"github.com/pkg/errors"
 	"github.com/trilitech/tzgo/contract"
 	"github.com/trilitech/tzgo/contract/bind"
 	"github.com/trilitech/tzgo/micheline"
 	"github.com/trilitech/tzgo/rpc"
 	"github.com/trilitech/tzgo/tezos"
-	"github.com/pkg/errors"
 )
 
 // Fa2Nft is a generated binding to a Tezos smart contract.
diff --git a/examples/tzgen/Hello.go b/examples/tzgen/Hello.go
index 2ea416b..b62291b 100644
--- a/examples/tzgen/Hello.go
+++ b/examples/tzgen/Hello.go
@@ -10,12 +10,12 @@ import (
 	"math/big"
 	"time"
 
+	"github.com/pkg/errors"
 	"github.com/trilitech/tzgo/contract"
 	"github.com/trilitech/tzgo/contract/bind"
 	"github.com/trilitech/tzgo/micheline"
 	"github.com/trilitech/tzgo/rpc"
 	"github.com/trilitech/tzgo/tezos"
-	"github.com/pkg/errors"
 )
 
 // Hello is a generated binding to a Tezos smart contract.
diff --git a/examples/tzgen/Payable.go b/examples/tzgen/Payable.go
index 900325d..cb1ae2f 100644
--- a/examples/tzgen/Payable.go
+++ b/examples/tzgen/Payable.go
@@ -10,12 +10,12 @@ import (
 	"math/big"
 	"time"
 
+	"github.com/pkg/errors"
 	"github.com/trilitech/tzgo/contract"
 	"github.com/trilitech/tzgo/contract/bind"
 	"github.com/trilitech/tzgo/micheline"
 	"github.com/trilitech/tzgo/rpc"
 	"github.com/trilitech/tzgo/tezos"
-	"github.com/pkg/errors"
 )
 
 // Payable is a generated binding to a Tezos smart contract.
diff --git a/micheline/primitives.go b/micheline/primitives.go
index 13ea367..669327c 100644
--- a/micheline/primitives.go
+++ b/micheline/primitives.go
@@ -1494,6 +1494,9 @@ func (p *Prim) DecodeBuffer(buf *bytes.Buffer) error {
 			p.Args = append(p.Args, prim)
 		}
 		// annotation array byte size
+		if buf.Len() < 4 {
+			return io.ErrShortBuffer
+		}
 		size = int(binary.BigEndian.Uint32(buf.Next(4)))
 		if buf.Len() < size {
 			return io.ErrShortBuffer
diff --git a/rpc/balance.go b/rpc/balance.go
index 232d482..4431796 100644
--- a/rpc/balance.go
+++ b/rpc/balance.go
@@ -34,9 +34,11 @@ type BalanceUpdate struct {
 
 	// Oxford staking
 	Staker struct {
-		Contract tezos.Address `json:"contract"` // tz1/2/3 accounts (only stake, unstake)
-		Delegate tezos.Address `json:"delegate"` // baker
-		Baker    tezos.Address `json:"baker"`    // baker
+		Contract      tezos.Address `json:"contract"`        // tz1/2/3 accounts (only stake, unstake)
+		Delegate      tezos.Address `json:"delegate"`        // baker
+		Baker         tezos.Address `json:"baker"`           // baker
+		BakerOwnStake tezos.Address `json:"baker_own_stake"` // baker: replaced baker in v19
+		BakerEdge     tezos.Address `json:"baker_edge"`      // baker: new in v19
 	} `json:"staker"`
 	DelayedOp tezos.OpHash `json:"delayed_operation_hash"`
 }
@@ -83,6 +85,10 @@ func (b BalanceUpdate) Address() tezos.Address {
 		return b.Staker.Delegate
 	case b.Staker.Baker.IsValid():
 		return b.Staker.Baker
+	case b.Staker.BakerOwnStake.IsValid():
+		return b.Staker.BakerOwnStake
+	case b.Staker.BakerEdge.IsValid():
+		return b.Staker.BakerEdge
 	}
 	return tezos.Address{}
 }
diff --git a/rpc/constants.go b/rpc/constants.go
index cc6a28f..51b03ff 100644
--- a/rpc/constants.go
+++ b/rpc/constants.go
@@ -101,6 +101,11 @@ func (c Constants) MapToChainParams() *tezos.Params {
 		MinimalBlockDelay:            time.Duration(c.MinimalBlockDelay) * time.Second,
 	}
 
+	// Paris blocks per snapshot
+	if p.BlocksPerSnapshot == 0 {
+		p.BlocksPerSnapshot = c.BlocksPerCycle
+	}
+
 	// backport preserved cycles
 	if p.ConsensusRightsDelay == 0 {
 		p.ConsensusRightsDelay = c.PreservedCycles
diff --git a/rpc/delegates.go b/rpc/delegates.go
index 283f5cd..2148f98 100644
--- a/rpc/delegates.go
+++ b/rpc/delegates.go
@@ -72,7 +72,7 @@ func (c *Client) ListActiveDelegates(ctx context.Context, id BlockID) (DelegateL
 	}
 	selector := "active=true"
 	if p.Version >= 13 {
-		selector = "with_minimal_stake=true"
+		selector += "&with_minimal_stake=true"
 	}
 	delegates := make(DelegateList, 0)
 	u := fmt.Sprintf("chains/main/blocks/%s/context/delegates?%s", id, selector)
diff --git a/tezos/param_test.go b/tezos/param_test.go
index f4ceb30..6658359 100644
--- a/tezos/param_test.go
+++ b/tezos/param_test.go
@@ -87,10 +87,8 @@ func TestParamsStatic(t *testing.T) {
 
 func TestDefaultParams(t *testing.T) {
 	for n, p := range map[string]*tezos.Params{
-		"main":    tezos.DefaultParams,
-		"ghost":   tezos.GhostnetParams,
-		"nairobi": tezos.NairobinetParams,
-		"oxford":  tezos.OxfordnetParams,
+		"main":  tezos.DefaultParams,
+		"ghost": tezos.GhostnetParams,
 	} {
 		if p.Network == "" {
 			t.Errorf("%s params: Empty network name", n)
@@ -756,7 +754,7 @@ var paramBlocks = []BlockMetadata{
 		LevelInfo: &LevelInfo{
 			Level:              3760128,
 			Cycle:              622,
-			CyclePosition:      8191,
+			CyclePosition:      16383,
 			ExpectedCommitment: true,
 		},
 		VotingPeriodInfo: &VotingPeriodInfo{
@@ -784,7 +782,7 @@ var paramBlocks = []BlockMetadata{
 		LevelInfo: &LevelInfo{
 			Level:              5070848,
 			Cycle:              702,
-			CyclePosition:      8191,
+			CyclePosition:      16383,
 			ExpectedCommitment: true,
 		},
 		VotingPeriodInfo: &VotingPeriodInfo{
@@ -812,7 +810,7 @@ var paramBlocks = []BlockMetadata{
 		LevelInfo: &LevelInfo{
 			Level:              5726208,
 			Cycle:              742,
-			CyclePosition:      8191,
+			CyclePosition:      16383,
 			ExpectedCommitment: true,
 		},
 		VotingPeriodInfo: &VotingPeriodInfo{
diff --git a/tezos/params.go b/tezos/params.go
index 6e8b555..1ecfdd1 100644
--- a/tezos/params.go
+++ b/tezos/params.go
@@ -40,36 +40,6 @@ var (
 		WithChainId(Ghostnet).
 		WithDeployment(Deployments[Ghostnet].AtProtocol(ProtoV019))
 
-	// NairobinetParams defines the blockchain configuration for Nairobi testnet.
-	// To produce compliant transactions, use these defaults in op.WithParams().
-	NairobinetParams = (&Params{
-		MinimalBlockDelay:            8 * time.Second,
-		CostPerByte:                  250,
-		OriginationSize:              257,
-		HardGasLimitPerOperation:     1040000,
-		HardGasLimitPerBlock:         2600000,
-		HardStorageLimitPerOperation: 60000,
-		MaxOperationDataLength:       32768,
-		MaxOperationsTTL:             240,
-	}).
-		WithChainId(Nairobinet).
-		WithDeployment(Deployments[Nairobinet].AtProtocol(ProtoV017))
-
-	// OxfordnetParams defines the blockchain configuration for Oxford testnet.
-	// To produce compliant transactions, use these defaults in op.WithParams().
-	OxfordnetParams = (&Params{
-		MinimalBlockDelay:            8 * time.Second,
-		CostPerByte:                  250,
-		OriginationSize:              257,
-		HardGasLimitPerOperation:     1040000,
-		HardGasLimitPerBlock:         2600000,
-		HardStorageLimitPerOperation: 60000,
-		MaxOperationDataLength:       32768,
-		MaxOperationsTTL:             240,
-	}).
-		WithChainId(Oxfordnet).
-		WithDeployment(Deployments[Oxfordnet].AtProtocol(ProtoV018))
-
 	// ParisnetParams defines the blockchain configuration for Paris testnet.
 	// To produce compliant transactions, use these defaults in op.WithParams().
 	ParisnetParams = (&Params{
@@ -141,12 +111,10 @@ func (p *Params) WithChainId(id ChainIdHash) *Params {
 			p.Network = "Mainnet"
 		case Ghostnet:
 			p.Network = "Ghostnet"
-		case Nairobinet:
-			p.Network = "Nairobinet"
-		case Oxfordnet:
-			p.Network = "Oxfordnet"
 		case Parisnet:
 			p.Network = "Parisnet"
+		case ParisCnet:
+			p.Network = "ParisCnet"
 		}
 	}
 	return p
@@ -155,7 +123,9 @@ func (p *Params) WithChainId(id ChainIdHash) *Params {
 func (p *Params) WithProtocol(h ProtocolHash) *Params {
 	var ok bool
 	p.Protocol = h
+	versionsMtx.RLock()
 	p.Version, ok = Versions[h]
+	versionsMtx.RUnlock()
 	if !ok {
 		var max int
 		for _, v := range Versions {
@@ -165,6 +135,8 @@ func (p *Params) WithProtocol(h ProtocolHash) *Params {
 			max = v
 		}
 		p.Version = max + 1
+		versionsMtx.Lock()
+		defer versionsMtx.Unlock()
 		Versions[h] = p.Version
 	}
 	switch {
@@ -265,7 +237,8 @@ func (p *Params) CycleFromHeight(height int64) int64 {
 func (p *Params) CycleStartHeight(c int64) int64 {
 	// adjust to target cycle
 	at := p.AtCycle(c)
-	return at.StartHeight - at.StartOffset + (c-at.StartCycle)*at.BlocksPerCycle
+	res := at.StartHeight - at.StartOffset + (c-at.StartCycle)*at.BlocksPerCycle
+	return res
 }
 
 func (p *Params) CycleEndHeight(c int64) int64 {
@@ -295,6 +268,11 @@ func (p *Params) IsCycleEnd(height int64) bool {
 }
 
 func (p *Params) IsSnapshotBlock(height int64) bool {
+	// no more snapshots in Paris
+	if p.Version > 18 && p.IsCycleEnd(height) {
+		return true
+	}
+
 	// adjust to target height
 	at := p.AtBlock(height)
 	pos := at.CyclePosition(height) + 1
@@ -308,7 +286,11 @@ func (p *Params) SnapshotBlock(cycle int64, index int) int64 {
 	if base < 0 {
 		return 0
 	}
-	return at.CycleStartHeight(base) + int64(index+1)*at.BlocksPerSnapshot - 1
+	offset := int64(index+1) * at.BlocksPerSnapshot
+	if offset > at.BlocksPerCycle {
+		offset = at.BlocksPerCycle
+	}
+	return at.CycleStartHeight(base) + offset - 1
 }
 
 func (p *Params) SnapshotIndex(height int64) int {
diff --git a/tezos/protocols.go b/tezos/protocols.go
index 1c07f53..5b4e1a4 100644
--- a/tezos/protocols.go
+++ b/tezos/protocols.go
@@ -3,6 +3,8 @@
 
 package tezos
 
+import "sync"
+
 var (
 	ProtoAlpha     = MustParseProtocolHash("ProtoALphaALphaALphaALphaALphaALphaALphaALphaDdp3zK")
 	ProtoGenesis   = MustParseProtocolHash("PrihK96nBAFSxVL1GLJTVhu9YnzkMFiBeuJRPA8NwuZVZCE1L6i")
@@ -25,7 +27,8 @@ var (
 	ProtoV016_2    = MustParseProtocolHash("PtMumbai2TmsJHNGRkD8v8YDbtao7BLUC3wjASn1inAKLFCjaH1")
 	ProtoV017      = MustParseProtocolHash("PtNairobiyssHuh87hEhfVBGCVrK3WnS8Z2FT4ymB5tAa4r1nQf")
 	ProtoV018      = MustParseProtocolHash("ProxfordYmVfjWnRcgjWH36fW6PArwqykTFzotUxRs6gmTcZDuH")
-	ProtoV019      = MustParseProtocolHash("PtParisBQscdCm6Cfow6ndeU6wKJyA3aV1j4D3gQBQMsTQyJCrz")
+	ProtoV019      = MustParseProtocolHash("PtParisBxoLz5gzMmn3d9WBQNoPSZakgnkMC2VNuQ3KXfUtUQeZ")
+	ProtoV020      = MustParseProtocolHash("PsParisCZo7KAh1Z1smVd9ZMZ1HHn5gkzbM94V3PLCpknFWhUAi")
 
 	// aliases
 	PtAthens  = ProtoV004
@@ -44,14 +47,15 @@ var (
 	PtNairobi = ProtoV017
 	Proxford  = ProtoV018
 	PtParisB  = ProtoV019
+	PsParisC  = ProtoV020
 
-	Mainnet    = MustParseChainIdHash("NetXdQprcVkpaWU")
-	Ghostnet   = MustParseChainIdHash("NetXnHfVqm9iesp")
-	Nairobinet = MustParseChainIdHash("NetXyuzvDo2Ugzb")
-	Oxfordnet  = MustParseChainIdHash("NetXxWsskGahzQB")
-	Parisnet   = MustParseChainIdHash("NetXo8SqH1c38SS")
+	Mainnet   = MustParseChainIdHash("NetXdQprcVkpaWU")
+	Ghostnet  = MustParseChainIdHash("NetXnHfVqm9iesp")
+	Parisnet  = MustParseChainIdHash("NetXR64bNAYkP4S")
+	ParisCnet = MustParseChainIdHash("NetXXWAHLEvre9b")
 
-	Versions = map[ProtocolHash]int{
+	versionsMtx = sync.RWMutex{}
+	Versions    = map[ProtocolHash]int{
 		ProtoGenesis:   0,
 		ProtoBootstrap: 0,
 		ProtoV001:      1,
@@ -73,7 +77,8 @@ var (
 		ProtoV017:      17,
 		ProtoV018:      18,
 		ProtoV019:      19,
-		ProtoAlpha:     20,
+		ProtoV020:      20,
+		ProtoAlpha:     21,
 	}
 
 	Deployments = map[ChainIdHash]ProtocolHistory{
@@ -98,38 +103,33 @@ var (
 			{PtMumbai, 0, 3268609, 3760128, 593, 5, 16384, 1024},  // v16
 			{PtNairobi, 0, 3760129, 5070848, 623, 5, 16384, 1024}, // v17
 			{Proxford, 0, 5070849, 5726208, 703, 5, 16384, 1024},  // v18
-			{PtParisB, 0, 5726209, -1, 743, 2, 24576, 24576},      // v19
+			{PtParisB, 0, 5726209, 5898240, 743, 2, 24576, 24576}, // v19
+			{PsParisC, 0, 5898241, -1, 750, 2, 24576, 24576},      // v19
 		},
 		Ghostnet: {
-			{ProtoGenesis, 0, 0, 0, 0, 3, 4096, 256},            // 0
-			{ProtoBootstrap, 0, 1, 1, 0, 3, 4096, 256},          // 0
-			{PtHangz2, 2, 2, 8191, 0, 3, 4096, 256},             // v11
-			{Psithaca, 0, 8192, 765952, 2, 3, 4096, 256},        // v12
-			{PtJakart, 0, 765953, 1191936, 187, 3, 4096, 256},   // v13
-			{PtKathma, 0, 1191937, 1654784, 291, 3, 4096, 256},  // v14
-			{PtLimaPt, 0, 1654785, 2162688, 404, 3, 4096, 256},  // v15
-			{PtMumbai, 0, 2162689, 2957312, 528, 3, 8192, 512},  // v16
-			{PtNairobi, 0, 2957313, 5316608, 625, 3, 8192, 512}, // v17
-			{Proxford, 0, 5316609, -1, 913, 3, 8192, 512},       // v18
-			// {PtParisB, 0, 5316609, -1, 913, 3, 8192, 8192},       // v19
+			{ProtoGenesis, 0, 0, 0, 0, 3, 4096, 256},               // 0
+			{ProtoBootstrap, 0, 1, 1, 0, 3, 4096, 256},             // 0
+			{PtHangz2, 2, 2, 8191, 0, 3, 4096, 256},                // v11
+			{Psithaca, 0, 8192, 765952, 2, 3, 4096, 256},           // v12
+			{PtJakart, 0, 765953, 1191936, 187, 3, 4096, 256},      // v13
+			{PtKathma, 0, 1191937, 1654784, 291, 3, 4096, 256},     // v14
+			{PtLimaPt, 0, 1654785, 2162688, 404, 3, 4096, 256},     // v15
+			{PtMumbai, 0, 2162689, 2957312, 528, 3, 8192, 512},     // v16
+			{PtNairobi, 0, 2957313, 5316608, 625, 3, 8192, 512},    // v17
+			{Proxford, 0, 5316609, 6422528, 913, 3, 8192, 512},     // v18
+			{PtParisB, 0, 6422529, 6729728, 1048, 2, 12288, 12288}, // v19
+			{PsParisC, 0, 6729729, -1, 1073, 2, 12288, 12288},      // v19
 		},
-		Nairobinet: {
-			{ProtoGenesis, 0, 0, 0, 0, 3, 8192, 512},   // 0
-			{ProtoBootstrap, 0, 1, 1, 0, 3, 8192, 512}, // 0
-			{PtMumbai, 2, 2, 16384, 0, 3, 8192, 512},   // v16
-			{PtNairobi, 0, 16385, -1, 2, 3, 8192, 512}, // v17
+		Parisnet: {
+			{ProtoGenesis, 0, 0, 0, 0, 3, 8192, 512},    // 0
+			{ProtoBootstrap, 0, 1, 1, 0, 3, 8192, 512},  // 0
+			{Proxford, 2, 2, 8192, 0, 3, 8192, 512},     // v18
+			{PtParisB, 0, 8193, -1, 1, 2, 12288, 12288}, // v19
 		},
-		Oxfordnet: {
+		ParisCnet: {
 			{ProtoGenesis, 0, 0, 0, 0, 3, 8192, 512},   // 0
 			{ProtoBootstrap, 0, 1, 1, 0, 3, 8192, 512}, // 0
-			{PtNairobi, 2, 2, 16384, 0, 3, 8192, 512},  // v17
-			{Proxford, 0, 16385, -1, 2, 3, 8192, 512},  // v18
-		},
-		Parisnet: {
-			{ProtoGenesis, 0, 0, 0, 0, 3, 8192, 512},     // 0
-			{ProtoBootstrap, 0, 1, 1, 0, 3, 8192, 512},   // 0
-			{Proxford, 2, 2, 16384, 0, 3, 8192, 512},     // v18
-			{PtParisB, 0, 16385, -1, 2, 2, 12288, 12288}, // v19
+			{PsParisC, 2, 2, -1, 0, 2, 128, 128},       // v19
 		},
 	}
 )