supplycommit: add ChainParams to supply commit state machine env

This allows derivation of PSBT BIP32 paths for a keychain.KeyDescriptor
using network-specific parameters.

The new field is unread in this commit but will be used later.

Author: ffranr

tapcfg/server.go

@@ -614,6 +614,7 @@ func genServerConfig(cfg *Config, cfgLogger btclog.Logger,
 			KeyRing:     keyRing,
 			Chain:       chainBridge,
 			StateLog:    supplyCommitStore,
+			ChainParams: *tapChainParams.Params,
 		},
 	)
 

universe/supplycommit/env.go

@@ -8,6 +8,7 @@ import (
 	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/btcutil/psbt"
+	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/lightninglabs/taproot-assets/asset"
@@ -407,6 +408,10 @@ type Environment struct {
 	// CommitConfTarget is the confirmation target used when crafting the
 	// commitment transaction.
 	CommitConfTarget uint32
+
+	// ChainParams is the chain parameters for the chain that we're
+	// operating on.
+	ChainParams chaincfg.Params
 }
 
 // SupplyCommitTxn encapsulates the details of the transaction that creates a

universe/supplycommit/multi_sm_manager.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/btcsuite/btcd/btcec/v2"
+	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/lightninglabs/taproot-assets/asset"
 	"github.com/lightninglabs/taproot-assets/fn"
 	"github.com/lightninglabs/taproot-assets/mssmt"
@@ -48,6 +49,10 @@ type MultiStateMachineManagerCfg struct {
 	// state machine. This is used to persist the state of the state machine
 	// across restarts.
 	StateLog StateMachineStore
+
+	// ChainParams is the chain parameters for the chain that we're
+	// operating on.
+	ChainParams chaincfg.Params
 }
 
 // MultiStateMachineManager is a manager for multiple supply commitment state
@@ -136,6 +141,7 @@ func (m *MultiStateMachineManager) fetchStateMachine(
 		Chain:            m.cfg.Chain,
 		StateLog:         m.cfg.StateLog,
 		CommitConfTarget: DefaultCommitConfTarget,
+		ChainParams:      m.cfg.ChainParams,
 	}
 
 	// TODO(ffranr): Get initial state from disk here.