AVM: Add `global GenesisHash` (#5858)

20 files changed, 184 insertions, 23 deletions

diff --git a/cmd/tealdbg/localLedger.go b/cmd/tealdbg/localLedger.go
index 64dfe7329..fc7655173 100644
--- a/cmd/tealdbg/localLedger.go
+++ b/cmd/tealdbg/localLedger.go
@@ -281,6 +281,10 @@ func (l *localLedger) BlockHdr(basics.Round) (bookkeeping.BlockHeader, error) {
 	return bookkeeping.BlockHeader{}, nil
 }
 
+func (l *localLedger) GenesisHash() crypto.Digest {
+	return crypto.Digest{}
+}
+
 func (l *localLedger) GetStateProofVerificationContext(_ basics.Round) (*ledgercore.StateProofVerificationContext, error) {
 	return nil, fmt.Errorf("localLedger: GetStateProofVerificationContext, needed for state proof verification, is not implemented in debugger")
 }
diff --git a/daemon/algod/api/server/v2/dryrun.go b/daemon/algod/api/server/v2/dryrun.go
index ef0de8085..acf5fc94b 100644
--- a/daemon/algod/api/server/v2/dryrun.go
+++ b/daemon/algod/api/server/v2/dryrun.go
@@ -22,6 +22,7 @@ import (
 	"strings"
 
 	"github.com/algorand/go-algorand/config"
+	"github.com/algorand/go-algorand/crypto"
 	"github.com/algorand/go-algorand/daemon/algod/api/server/v2/generated/model"
 	"github.com/algorand/go-algorand/data/basics"
 	"github.com/algorand/go-algorand/data/bookkeeping"
@@ -241,6 +242,10 @@ func (dl *dryrunLedger) BlockHdr(basics.Round) (bookkeeping.BlockHeader, error)
 	return bookkeeping.BlockHeader{}, nil
 }
 
+func (dl *dryrunLedger) GenesisHash() crypto.Digest {
+	return crypto.Digest{}
+}
+
 func (dl *dryrunLedger) CheckDup(config.ConsensusParams, basics.Round, basics.Round, basics.Round, transactions.Txid, ledgercore.Txlease) error {
 	return nil
 }
diff --git a/data/transactions/logic/README.md b/data/transactions/logic/README.md
index da4fdefac..a38ba1462 100644
--- a/data/transactions/logic/README.md
+++ b/data/transactions/logic/README.md
@@ -633,6 +633,7 @@ Global fields are fields that are common to all the transactions in the group. I
 | 14 | CallerApplicationAddress | address | v6  | The application address of the application that called this application. ZeroAddress if this application is at the top-level. Application mode only. |
 | 15 | AssetCreateMinBalance | uint64 | v10  | The additional minimum balance required to create (and opt-in to) an asset. |
 | 16 | AssetOptInMinBalance | uint64 | v10  | The additional minimum balance required to opt-in to an asset. |
+| 17 | GenesisHash | [32]byte | v10  | The Genesis Hash for the network. |
 
 
 **Asset Fields**
diff --git a/data/transactions/logic/TEAL_opcodes_v10.md b/data/transactions/logic/TEAL_opcodes_v10.md
index 7df81c33a..81d742fbd 100644
--- a/data/transactions/logic/TEAL_opcodes_v10.md
+++ b/data/transactions/logic/TEAL_opcodes_v10.md
@@ -461,6 +461,7 @@ Fields
 | 14 | CallerApplicationAddress | address | v6  | The application address of the application that called this application. ZeroAddress if this application is at the top-level. Application mode only. |
 | 15 | AssetCreateMinBalance | uint64 | v10  | The additional minimum balance required to create (and opt-in to) an asset. |
 | 16 | AssetOptInMinBalance | uint64 | v10  | The additional minimum balance required to opt-in to an asset. |
+| 17 | GenesisHash | [32]byte | v10  | The Genesis Hash for the network. |
 
 
 ## gtxn
diff --git a/data/transactions/logic/assembler_test.go b/data/transactions/logic/assembler_test.go
index 4fdcaae61..0963ee148 100644
--- a/data/transactions/logic/assembler_test.go
+++ b/data/transactions/logic/assembler_test.go
@@ -1686,17 +1686,19 @@ txn NumApprovalProgramPages
 txna ApprovalProgramPages 0
 txn NumClearStateProgramPages
 txna ClearStateProgramPages 0
+pushint 1
+block BlkTimestamp
+pushint 1
+block BlkSeed
 global AssetCreateMinBalance
 global AssetOptInMinBalance
+global GenesisHash
 `, AssemblerMaxVersion)
-	for _, globalField := range GlobalFieldNames {
-		if !strings.Contains(text, globalField) {
-			t.Errorf("TestAssembleDisassemble missing field global %v", globalField)
-		}
-	}
-	for _, txnField := range TxnFieldNames {
-		if !strings.Contains(text, txnField) {
-			t.Errorf("TestAssembleDisassemble missing field txn %v", txnField)
+	for _, names := range [][]string{GlobalFieldNames[:], TxnFieldNames[:], blockFieldNames[:]} {
+		for _, f := range names {
+			if !strings.Contains(text, f) {
+				t.Errorf("TestAssembleDisassemble missing field %v", f)
+			}
 		}
 	}
 	ops := testProg(t, text, AssemblerMaxVersion)
diff --git a/data/transactions/logic/eval.go b/data/transactions/logic/eval.go
index 0e1faec0d..883eddcec 100644
--- a/data/transactions/logic/eval.go
+++ b/data/transactions/logic/eval.go
@@ -200,10 +200,12 @@ func computeMinAvmVersion(group []transactions.SignedTxnWithAD) uint64 {
 // "stateless" for signature purposes.
 type LedgerForSignature interface {
 	BlockHdr(basics.Round) (bookkeeping.BlockHeader, error)
+	GenesisHash() crypto.Digest
 }
 
-// NoHeaderLedger is intended for debugging situations in which it is reasonable
-// to preclude the use of `block` and `txn LastValidTime`
+// NoHeaderLedger is intended for debugging TEAL in isolation(no real ledger) in
+// which it is reasonable to preclude the use of `block`, `txn
+// LastValidTime`. Also `global GenesisHash` is just a static value.
 type NoHeaderLedger struct {
 }
 
@@ -212,6 +214,16 @@ func (NoHeaderLedger) BlockHdr(basics.Round) (bookkeeping.BlockHeader, error) {
 	return bookkeeping.BlockHeader{}, fmt.Errorf("no block header access")
 }
 
+// GenesisHash returns a fixed value
+func (NoHeaderLedger) GenesisHash() crypto.Digest {
+	return crypto.Digest{
+		0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+		0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+		0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+		0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+	}
+}
+
 // LedgerForLogic represents ledger API for Stateful TEAL program
 type LedgerForLogic interface {
 	AccountData(addr basics.Address) (ledgercore.AccountData, error)
@@ -3610,8 +3622,11 @@ func (cx *EvalContext) globalFieldToValue(fs globalFieldSpec) (sv stackValue, er
 		sv.Uint = cx.Proto.MinBalance
 	case AssetOptInMinBalance:
 		sv.Uint = cx.Proto.MinBalance
+	case GenesisHash:
+		gh := cx.SigLedger.GenesisHash()
+		sv.Bytes = gh[:]
 	default:
-		err = fmt.Errorf("invalid global field %d", fs.field)
+		return sv, fmt.Errorf("invalid global field %s", fs.field)
 	}
 
 	if fs.ftype.AVMType != sv.avmType() {
@@ -5587,7 +5602,7 @@ func opBlock(cx *EvalContext) error {
 		cx.Stack[last].Uint = uint64(hdr.TimeStamp)
 		return nil
 	default:
-		return fmt.Errorf("invalid block field %d", fs.field)
+		return fmt.Errorf("invalid block field %s", fs.field)
 	}
 }
 
diff --git a/data/transactions/logic/evalAppTxn_test.go b/data/transactions/logic/evalAppTxn_test.go
index 06fee09c1..4682732fb 100644
--- a/data/transactions/logic/evalAppTxn_test.go
+++ b/data/transactions/logic/evalAppTxn_test.go
@@ -575,6 +575,37 @@ func TestBadField(t *testing.T) {
 	TestAppBytes(t, ops.Program, ep, "invalid itxn_field FirstValid")
 }
 
+// TestInnerValidity logs fv and lv fields that are handled oddly (valid
+// rounds are copied) so we can check if they are correct.
+func TestInnerValidity(t *testing.T) {
+	partitiontest.PartitionTest(t)
+	t.Parallel()
+	ep, tx, ledger := MakeSampleEnv()
+	tx.GenesisHash = crypto.Digest{0x01, 0x02, 0x03}
+	logger := TestProg(t, `
+txn FirstValid; itob; log;
+txn LastValid; itob; log;
+int 1`, AssemblerMaxVersion)
+	ledger.NewApp(tx.Receiver, 222, basics.AppParams{
+		ApprovalProgram: logger.Program,
+	})
+
+	ledger.NewAccount(appAddr(888), 50_000)
+	tx.ForeignApps = []basics.AppIndex{basics.AppIndex(222)}
+	TestApp(t, `
+itxn_begin
+int appl;    itxn_field TypeEnum
+int 222;     itxn_field ApplicationID
+itxn_submit
+itxn Logs 0; btoi; txn FirstValid; ==; assert
+itxn Logs 1; btoi; txn LastValid; ==; assert
+itxn FirstValid; txn FirstValid; ==; assert
+itxn LastValid; txn LastValid; ==; assert
+int 1
+`, ep)
+
+}
+
 func TestNumInnerShallow(t *testing.T) {
 	partitiontest.PartitionTest(t)
 	t.Parallel()
diff --git a/data/transactions/logic/evalStateful_test.go b/data/transactions/logic/evalStateful_test.go
index 436643e4c..d25851be0 100644
--- a/data/transactions/logic/evalStateful_test.go
+++ b/data/transactions/logic/evalStateful_test.go
@@ -3435,6 +3435,14 @@ func TestLatestTimestamp(t *testing.T) {
 	testApp(t, source, ep)
 }
 
+func TestGenHash(t *testing.T) {
+	partitiontest.PartitionTest(t)
+	t.Parallel()
+	ep, _, _ := makeSampleEnv()
+	source := fmt.Sprintf("global GenesisHash; byte 0x%s; ==", hex.EncodeToString(testGenHash[:]))
+	testApp(t, source, ep)
+}
+
 func TestBlockSeed(t *testing.T) {
 	partitiontest.PartitionTest(t)
 	t.Parallel()
@@ -3465,7 +3473,7 @@ func TestBlockSeed(t *testing.T) {
 	testApp(t, "int 4294967310; int 1502; -; block BlkSeed; len; int 32; ==", ep,
 		"not available") // 1501 back from lv is not
 
-	// A little silly, as it only tests the test ledger: ensure samenes and differentness
+	// A little silly, as it only tests the test ledger: ensure sameness and differentness
 	testApp(t, "int 0xfffffff0; block BlkSeed; int 0xfffffff0; block BlkSeed; ==", ep)
 	testApp(t, "int 0xfffffff0; block BlkSeed; int 0xfffffff1; block BlkSeed; !=", ep)
 
diff --git a/data/transactions/logic/fields.go b/data/transactions/logic/fields.go
index bb5c2179e..060516d65 100644
--- a/data/transactions/logic/fields.go
+++ b/data/transactions/logic/fields.go
@@ -535,6 +535,9 @@ const (
 	// AssetOptInMinBalance is the additional minimum balance required to opt in to an asset
 	AssetOptInMinBalance
 
+	// GenesisHash is the genesis hash for the network
+	GenesisHash
+
 	invalidGlobalField // compile-time constant for number of fields
 )
 
@@ -599,6 +602,7 @@ var globalFieldSpecs = [...]globalFieldSpec{
 		"The additional minimum balance required to create (and opt-in to) an asset."},
 	{AssetOptInMinBalance, StackUint64, modeAny, 10,
 		"The additional minimum balance required to opt-in to an asset."},
+	{GenesisHash, StackBytes32, modeAny, 10, "The Genesis Hash for the network."},
 }
 
 func globalFieldSpecByField(f GlobalField) (globalFieldSpec, bool) {
@@ -961,6 +965,7 @@ const (
 	BlkSeed BlockField = iota
 	// BlkTimestamp is the Block's timestamp, seconds from epoch
 	BlkTimestamp
+
 	invalidBlockField // compile-time constant for number of fields
 )
 
diff --git a/data/transactions/logic/fields_string.go b/data/transactions/logic/fields_string.go
index 7d3c2b42f..37bfeb9bc 100644
--- a/data/transactions/logic/fields_string.go
+++ b/data/transactions/logic/fields_string.go
@@ -110,12 +110,13 @@ func _() {
 	_ = x[CallerApplicationAddress-14]
 	_ = x[AssetCreateMinBalance-15]
 	_ = x[AssetOptInMinBalance-16]
-	_ = x[invalidGlobalField-17]
+	_ = x[GenesisHash-17]
+	_ = x[invalidGlobalField-18]
 }
 
-const _GlobalField_name = "MinTxnFeeMinBalanceMaxTxnLifeZeroAddressGroupSizeLogicSigVersionRoundLatestTimestampCurrentApplicationIDCreatorAddressCurrentApplicationAddressGroupIDOpcodeBudgetCallerApplicationIDCallerApplicationAddressAssetCreateMinBalanceAssetOptInMinBalanceinvalidGlobalField"
+const _GlobalField_name = "MinTxnFeeMinBalanceMaxTxnLifeZeroAddressGroupSizeLogicSigVersionRoundLatestTimestampCurrentApplicationIDCreatorAddressCurrentApplicationAddressGroupIDOpcodeBudgetCallerApplicationIDCallerApplicationAddressAssetCreateMinBalanceAssetOptInMinBalanceGenesisHashinvalidGlobalField"
 
-var _GlobalField_index = [...]uint16{0, 9, 19, 29, 40, 49, 64, 69, 84, 104, 118, 143, 150, 162, 181, 205, 226, 246, 264}
+var _GlobalField_index = [...]uint16{0, 9, 19, 29, 40, 49, 64, 69, 84, 104, 118, 143, 150, 162, 181, 205, 226, 246, 257, 275}
 
 func (i GlobalField) String() string {
 	if i >= GlobalField(len(_GlobalField_index)-1) {
diff --git a/data/transactions/logic/fields_test.go b/data/transactions/logic/fields_test.go
index f4736f621..2fd432956 100644
--- a/data/transactions/logic/fields_test.go
+++ b/data/transactions/logic/fields_test.go
@@ -112,6 +112,19 @@ func TestTxnFieldVersions(t *testing.T) {
 				asmError = "...txna opcode was introduced in ..."
 				txnaMode = true
 			}
+
+			// tack on a type check, and return a value (`int` gets compiled
+			// differently in different versions, so use `txn FirstValid` to get
+			// a positive integer)
+			switch fs.ftype.AVMType {
+			case avmUint64: // ensure the return type is uint64 by using !
+				text += "; !; pop; txn FirstValid"
+			case avmBytes: // ensure the return type is bytes by using len
+				text += "; len; pop; txn FirstValid"
+			case avmAny:
+				text += "; pop; txn FirstValid"
+			}
+
 			// check assembler fails if version before introduction
 			testLine(t, text, assemblerNoVersion, asmError)
 			for v := uint64(0); v < fs.version; v++ {
@@ -124,6 +137,18 @@ func TestTxnFieldVersions(t *testing.T) {
 
 			ops := testProg(t, text, AssemblerMaxVersion)
 
+			// check success in AssemblerMaxVersion, fs.version
+			// also ensures the field returns the right type
+			if !fs.effects {
+				txgroup[0].Txn.ApprovalProgram = []byte("approve") // not in standard sample txn
+				txgroup[0].Txn.ClearStateProgram = []byte("clear")
+				ep := defaultAppParamsWithVersion(AssemblerMaxVersion, txgroup...)
+				testAppBytes(t, ops.Program, ep)
+				opsv := testProg(t, text, fs.version)
+				ep = defaultAppParamsWithVersion(fs.version, txgroup...)
+				testAppBytes(t, opsv.Program, ep)
+			}
+
 			preVersion := fs.version - 1
 			ep := defaultSigParamsWithVersion(preVersion, txgroup...)
 
@@ -283,3 +308,36 @@ func TestAcctParamsFieldsVersions(t *testing.T) {
 
 	}
 }
+
+func TestBlockFieldsVersions(t *testing.T) {
+	partitiontest.PartitionTest(t)
+	t.Parallel()
+
+	for _, field := range blockFieldSpecs {
+		text := fmt.Sprintf("txn FirstValid; int 1; - ; block %s;", field.field)
+		if field.ftype.AVMType == avmBytes {
+			text += "global ZeroAddress; concat; len" // use concat to prove we have bytes
+		} else {
+			text += "global ZeroAddress; len; +" // use + to prove we have an int
+		}
+
+		testLogicRange(t, 4, 0, func(t *testing.T, ep *EvalParams, txn *transactions.Transaction, ledger *Ledger) {
+			v := ep.Proto.LogicSigVersion
+			if field.version > v {
+				// check assembler fails if version before introduction
+				testProg(t, text, v, exp(1, "...was introduced in..."))
+				ops := testProg(t, text, field.version) // assemble in the future
+				ops.Program[0] = byte(v)                // but set version back to before intro
+				if v < randomnessVersion {
+					testAppBytes(t, ops.Program, ep, "illegal opcode", "illegal opcode")
+				} else {
+					testAppBytes(t, ops.Program, ep, "invalid block field")
+				}
+			} else {
+				testProg(t, text, v)
+				testApp(t, text, ep)
+			}
+		})
+
+	}
+}
diff --git a/data/transactions/logic/langspec_v10.json b/data/transactions/logic/langspec_v10.json
index affe46601..2141e8fe0 100644
--- a/data/transactions/logic/langspec_v10.json
+++ b/data/transactions/logic/langspec_v10.json
@@ -1196,7 +1196,8 @@
         "CallerApplicationID",
         "CallerApplicationAddress",
         "AssetCreateMinBalance",
-        "AssetOptInMinBalance"
+        "AssetOptInMinBalance",
+        "GenesisHash"
       ],
       "ArgEnumTypes": [
         "uint64",
@@ -1215,7 +1216,8 @@
         "uint64",
         "address",
         "uint64",
-        "uint64"
+        "uint64",
+        "[32]byte"
       ],
       "DocCost": "1",
       "Doc": "global field F",
diff --git a/data/transactions/logic/ledger_test.go b/data/transactions/logic/ledger_test.go
index a111eec13..a575c493d 100644
--- a/data/transactions/logic/ledger_test.go
+++ b/data/transactions/logic/ledger_test.go
@@ -36,6 +36,7 @@ import (
 	"math"
 	"math/rand"
 
+	"github.com/algorand/go-algorand/crypto"
 	"github.com/algorand/go-algorand/data/basics"
 	"github.com/algorand/go-algorand/data/bookkeeping"
 	"github.com/algorand/go-algorand/data/committee"
@@ -607,6 +608,13 @@ func (l *Ledger) AppParams(appID basics.AppIndex) (basics.AppParams, basics.Addr
 	return basics.AppParams{}, basics.Address{}, fmt.Errorf("no app %d", appID)
 }
 
+var testGenHash = crypto.Digest{0x03, 0x02, 0x03}
+
+// GenesisHash returns a phony genesis hash that can be tested against
+func (l *Ledger) GenesisHash() crypto.Digest {
+	return testGenHash
+}
+
 func (l *Ledger) move(from basics.Address, to basics.Address, amount uint64) error {
 	fbr, ok := l.balances[from]
 	if !ok {
diff --git a/data/transactions/logic/teal.tmLanguage.json b/data/transactions/logic/teal.tmLanguage.json
index ef80fd048..e414922e8 100644
--- a/data/transactions/logic/teal.tmLanguage.json
+++ b/data/transactions/logic/teal.tmLanguage.json
@@ -112,7 +112,7 @@
         },
         {
           "name": "variable.parameter.teal",
-          "match": "\\b(unknown|pay|keyreg|acfg|axfer|afrz|appl|NoOp|OptIn|CloseOut|ClearState|UpdateApplication|DeleteApplication|Secp256k1|Secp256r1|Sender|Fee|FirstValid|FirstValidTime|LastValid|Note|Lease|Receiver|Amount|CloseRemainderTo|VotePK|SelectionPK|VoteFirst|VoteLast|VoteKeyDilution|Type|TypeEnum|XferAsset|AssetAmount|AssetSender|AssetReceiver|AssetCloseTo|GroupIndex|TxID|ApplicationID|OnCompletion|NumAppArgs|NumAccounts|ApprovalProgram|ClearStateProgram|RekeyTo|ConfigAsset|ConfigAssetTotal|ConfigAssetDecimals|ConfigAssetDefaultFrozen|ConfigAssetUnitName|ConfigAssetName|ConfigAssetURL|ConfigAssetMetadataHash|ConfigAssetManager|ConfigAssetReserve|ConfigAssetFreeze|ConfigAssetClawback|FreezeAsset|FreezeAssetAccount|FreezeAssetFrozen|NumAssets|NumApplications|GlobalNumUint|GlobalNumByteSlice|LocalNumUint|LocalNumByteSlice|ExtraProgramPages|Nonparticipation|NumLogs|CreatedAssetID|CreatedApplicationID|LastLog|StateProofPK|NumApprovalProgramPages|NumClearStateProgramPages|MinTxnFee|MinBalance|MaxTxnLife|ZeroAddress|GroupSize|LogicSigVersion|Round|LatestTimestamp|CurrentApplicationID|CreatorAddress|CurrentApplicationAddress|GroupID|OpcodeBudget|CallerApplicationID|CallerApplicationAddress|AssetCreateMinBalance|AssetOptInMinBalance|ApplicationArgs|Accounts|Assets|Applications|Logs|ApprovalProgramPages|ClearStateProgramPages|URLEncoding|StdEncoding|JSONString|JSONUint64|JSONObject|AssetBalance|AssetFrozen|AssetTotal|AssetDecimals|AssetDefaultFrozen|AssetUnitName|AssetName|AssetURL|AssetMetadataHash|AssetManager|AssetReserve|AssetFreeze|AssetClawback|AssetCreator|AppApprovalProgram|AppClearStateProgram|AppGlobalNumUint|AppGlobalNumByteSlice|AppLocalNumUint|AppLocalNumByteSlice|AppExtraProgramPages|AppCreator|AppAddress|AcctBalance|AcctMinBalance|AcctAuthAddr|AcctTotalNumUint|AcctTotalNumByteSlice|AcctTotalExtraAppPages|AcctTotalAppsCreated|AcctTotalAppsOptedIn|AcctTotalAssetsCreated|AcctTotalAssets|AcctTotalBoxes|AcctTotalBoxBytes|VrfAlgorand|BlkSeed|BlkTimestamp|BN254g1|BN254g2|BLS12_381g1|BLS12_381g2)\\b"
+          "match": "\\b(unknown|pay|keyreg|acfg|axfer|afrz|appl|NoOp|OptIn|CloseOut|ClearState|UpdateApplication|DeleteApplication|Secp256k1|Secp256r1|Sender|Fee|FirstValid|FirstValidTime|LastValid|Note|Lease|Receiver|Amount|CloseRemainderTo|VotePK|SelectionPK|VoteFirst|VoteLast|VoteKeyDilution|Type|TypeEnum|XferAsset|AssetAmount|AssetSender|AssetReceiver|AssetCloseTo|GroupIndex|TxID|ApplicationID|OnCompletion|NumAppArgs|NumAccounts|ApprovalProgram|ClearStateProgram|RekeyTo|ConfigAsset|ConfigAssetTotal|ConfigAssetDecimals|ConfigAssetDefaultFrozen|ConfigAssetUnitName|ConfigAssetName|ConfigAssetURL|ConfigAssetMetadataHash|ConfigAssetManager|ConfigAssetReserve|ConfigAssetFreeze|ConfigAssetClawback|FreezeAsset|FreezeAssetAccount|FreezeAssetFrozen|NumAssets|NumApplications|GlobalNumUint|GlobalNumByteSlice|LocalNumUint|LocalNumByteSlice|ExtraProgramPages|Nonparticipation|NumLogs|CreatedAssetID|CreatedApplicationID|LastLog|StateProofPK|NumApprovalProgramPages|NumClearStateProgramPages|MinTxnFee|MinBalance|MaxTxnLife|ZeroAddress|GroupSize|LogicSigVersion|Round|LatestTimestamp|CurrentApplicationID|CreatorAddress|CurrentApplicationAddress|GroupID|OpcodeBudget|CallerApplicationID|CallerApplicationAddress|AssetCreateMinBalance|AssetOptInMinBalance|GenesisHash|ApplicationArgs|Accounts|Assets|Applications|Logs|ApprovalProgramPages|ClearStateProgramPages|URLEncoding|StdEncoding|JSONString|JSONUint64|JSONObject|AssetBalance|AssetFrozen|AssetTotal|AssetDecimals|AssetDefaultFrozen|AssetUnitName|AssetName|AssetURL|AssetMetadataHash|AssetManager|AssetReserve|AssetFreeze|AssetClawback|AssetCreator|AppApprovalProgram|AppClearStateProgram|AppGlobalNumUint|AppGlobalNumByteSlice|AppLocalNumUint|AppLocalNumByteSlice|AppExtraProgramPages|AppCreator|AppAddress|AcctBalance|AcctMinBalance|AcctAuthAddr|AcctTotalNumUint|AcctTotalNumByteSlice|AcctTotalExtraAppPages|AcctTotalAppsCreated|AcctTotalAppsOptedIn|AcctTotalAssetsCreated|AcctTotalAssets|AcctTotalBoxes|AcctTotalBoxBytes|VrfAlgorand|BlkSeed|BlkTimestamp|BN254g1|BN254g2|BLS12_381g1|BLS12_381g2)\\b"
         }
       ]
     },
diff --git a/data/transactions/verify/txn_test.go b/data/transactions/verify/txn_test.go
index 416c0e4c0..d2061b872 100644
--- a/data/transactions/verify/txn_test.go
+++ b/data/transactions/verify/txn_test.go
@@ -78,6 +78,9 @@ func (d *DummyLedgerForSignature) BlockHdr(rnd basics.Round) (blk bookkeeping.Bl
 	}
 	return createDummyBlockHeader(), nil
 }
+func (d *DummyLedgerForSignature) GenesisHash() crypto.Digest {
+	return crypto.Digest{}
+}
 func (d *DummyLedgerForSignature) Latest() basics.Round {
 	return 0
 }
diff --git a/ledger/eval/appcow_test.go b/ledger/eval/appcow_test.go
index 2c46d02c0..a4c8d22c6 100644
--- a/ledger/eval/appcow_test.go
+++ b/ledger/eval/appcow_test.go
@@ -25,6 +25,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/algorand/go-algorand/config"
+	"github.com/algorand/go-algorand/crypto"
 	"github.com/algorand/go-algorand/data/basics"
 	"github.com/algorand/go-algorand/data/bookkeeping"
 	"github.com/algorand/go-algorand/data/transactions"
@@ -99,8 +100,8 @@ func (ml *emptyLedger) BlockHdr(rnd basics.Round) (bookkeeping.BlockHeader, erro
 	return bookkeeping.BlockHeader{}, nil
 }
 
-func (ml *emptyLedger) blockHdrCached(rnd basics.Round) (bookkeeping.BlockHeader, error) {
-	return bookkeeping.BlockHeader{}, nil
+func (ml *emptyLedger) GenesisHash() crypto.Digest {
+	return crypto.Digest{}
 }
 
 func (ml *emptyLedger) GetStateProofNextRound() basics.Round {
diff --git a/ledger/eval/cow.go b/ledger/eval/cow.go
index d797a4a56..f3e6b3d04 100644
--- a/ledger/eval/cow.go
+++ b/ledger/eval/cow.go
@@ -22,6 +22,7 @@ import (
 	"sync"
 
 	"github.com/algorand/go-algorand/config"
+	"github.com/algorand/go-algorand/crypto"
 	"github.com/algorand/go-algorand/data/basics"
 	"github.com/algorand/go-algorand/data/bookkeeping"
 	"github.com/algorand/go-algorand/data/transactions"
@@ -65,6 +66,7 @@ type roundCowParent interface {
 	getKey(addr basics.Address, aidx basics.AppIndex, global bool, key string, accountIdx uint64) (basics.TealValue, bool, error)
 	kvGet(key string) ([]byte, bool, error)
 	GetStateProofVerificationContext(stateProofLastAttestedRound basics.Round) (*ledgercore.StateProofVerificationContext, error)
+	GenesisHash() crypto.Digest
 }
 
 // When adding new fields make sure to clear them in the roundCowState.recycle() as well to avoid dirty state
@@ -245,6 +247,10 @@ func (cb *roundCowState) BlockHdr(r basics.Round) (bookkeeping.BlockHeader, erro
 	return cb.lookupParent.BlockHdr(r)
 }
 
+func (cb *roundCowState) GenesisHash() crypto.Digest {
+	return cb.lookupParent.GenesisHash()
+}
+
 func (cb *roundCowState) GetStateProofVerificationContext(stateProofLastAttestedRound basics.Round) (*ledgercore.StateProofVerificationContext, error) {
 	return cb.lookupParent.GetStateProofVerificationContext(stateProofLastAttestedRound)
 }
diff --git a/ledger/eval/cow_test.go b/ledger/eval/cow_test.go
index 225b03799..5e1253adc 100644
--- a/ledger/eval/cow_test.go
+++ b/ledger/eval/cow_test.go
@@ -24,6 +24,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/algorand/go-algorand/config"
+	"github.com/algorand/go-algorand/crypto"
 	"github.com/algorand/go-algorand/data/basics"
 	"github.com/algorand/go-algorand/data/bookkeeping"
 	"github.com/algorand/go-algorand/data/stateproofmsg"
@@ -103,8 +104,8 @@ func (ml *mockLedger) BlockHdr(rnd basics.Round) (bookkeeping.BlockHeader, error
 	return bookkeeping.BlockHeader{}, errors.New("requested blockheader not found")
 }
 
-func (ml *mockLedger) blockHdrCached(rnd basics.Round) (bookkeeping.BlockHeader, error) {
-	return ml.BlockHdr(rnd)
+func (ml *mockLedger) GenesisHash() crypto.Digest {
+	panic("GenesisHash unused by tests")
 }
 
 func (ml *mockLedger) GetStateProofVerificationContext(rnd basics.Round) (*ledgercore.StateProofVerificationContext, error) {
diff --git a/ledger/eval/eval.go b/ledger/eval/eval.go
index 58f7fc8a4..714e6bddf 100644
--- a/ledger/eval/eval.go
+++ b/ledger/eval/eval.go
@@ -40,6 +40,7 @@ import (
 // LedgerForCowBase represents subset of Ledger functionality needed for cow business
 type LedgerForCowBase interface {
 	BlockHdr(basics.Round) (bookkeeping.BlockHeader, error)
+	GenesisHash() crypto.Digest
 	CheckDup(config.ConsensusParams, basics.Round, basics.Round, basics.Round, transactions.Txid, ledgercore.Txlease) error
 	LookupWithoutRewards(basics.Round, basics.Address) (ledgercore.AccountData, basics.Round, error)
 	LookupAsset(basics.Round, basics.Address, basics.AssetIndex) (ledgercore.AssetResource, error)
@@ -337,6 +338,10 @@ func (x *roundCowBase) BlockHdr(r basics.Round) (bookkeeping.BlockHeader, error)
 	return x.l.BlockHdr(r)
 }
 
+func (x *roundCowBase) GenesisHash() crypto.Digest {
+	return x.l.GenesisHash()
+}
+
 func (x *roundCowBase) GetStateProofVerificationContext(stateProofLastAttestedRound basics.Round) (*ledgercore.StateProofVerificationContext, error) {
 	return x.l.GetStateProofVerificationContext(stateProofLastAttestedRound)
 }
diff --git a/ledger/eval/eval_test.go b/ledger/eval/eval_test.go
index b91655831..93a2afd2d 100644
--- a/ledger/eval/eval_test.go
+++ b/ledger/eval/eval_test.go
@@ -1037,6 +1037,10 @@ func (l *testCowBaseLedger) BlockHdr(basics.Round) (bookkeeping.BlockHeader, err
 	return bookkeeping.BlockHeader{}, errors.New("not implemented")
 }
 
+func (l *testCowBaseLedger) GenesisHash() crypto.Digest {
+	panic("not implemented")
+}
+
 func (l *testCowBaseLedger) CheckDup(config.ConsensusParams, basics.Round, basics.Round, basics.Round, transactions.Txid, ledgercore.Txlease) error {
 	return errors.New("not implemented")
 }