diff --git a/jsonrpc/eth_endpoint.go b/jsonrpc/eth_endpoint.go
index d08f54ee5d..cda9c7866a 100644
--- a/jsonrpc/eth_endpoint.go
+++ b/jsonrpc/eth_endpoint.go
@@ -732,6 +732,13 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 		return nil, err
 	}
 
+	// Get the previous block header
+	var previousBlockNumber = BlockNumber(header.Number) - 1
+	previousHeader, err := GetHeaderFromBlockNumberOrHash(BlockNumberOrHash{BlockNumber: &previousBlockNumber}, e.store)
+	if err != nil {
+		return nil, err
+	}
+
 	fullBlock, valid := e.store.GetBlockByHash(header.Hash, true)
 	if !valid {
 		return nil, fmt.Errorf("failed to get block by hash %s", header.Hash)
@@ -743,7 +750,7 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 		return nil, err
 	}
 
-	// Trace the block
+	// Configure the tracer
 	tracer, _, err := NewTracer(&TraceConfig{
 		EnableMemory:     true,
 		EnableReturnData: true,
@@ -774,8 +781,9 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 	for _, accountStr := range accountsStr {
 		accountAddress := types.StringToAddress(accountStr)
 
-		// Get the full account nonce, balance, state root and code hash
-		acc, err := e.store.GetAccount(header.StateRoot, accountAddress)
+		// Get the full account nonce, balance, state root and code hash of the state before this
+		// block is executed
+		acc, err := e.store.GetAccount(previousHeader.StateRoot, accountAddress)
 		if err != nil {
 			return nil, err
 		}
@@ -788,7 +796,7 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 		}
 	}
 
-	// Get storage data for all accounts from this block
+	// Lear of the storage changes in this block
 	storages := make([]prover.Storage, 0)
 
 	storageChanges, err := prover.ParseTraceForStorageChanges(tracesJSON)
@@ -796,13 +804,15 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 		return nil, err
 	}
 
+	// Get the starting state storage merkle proof for each account and each slot
+	// that will be changed in this block execution
 	for account, accountData := range accounts {
 		if accountData.CodeHash != EmptyCodeHash {
 			storageUpdates := make([]prover.StorageUpdate, 0)
 
-			// Account has code
+			// Account is smart contract (has code)
 			for _, storageChange := range storageChanges[account] {
-				storageMerkleProof, err := e.store.GetStorageProof(header.StateRoot,
+				storageMerkleProof, err := e.store.GetStorageProof(previousHeader.StateRoot,
 					types.StringToAddress(account), storageChange.Slot)
 				if err != nil {
 					return nil, err
@@ -814,7 +824,6 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 				}
 
 				storageUpdates = append(storageUpdates, prover.StorageUpdate{
-					Value:       storageChange.Value.String(),
 					Slot:        storageChange.Slot.String(),
 					MerkleProof: ss,
 				})
@@ -828,8 +837,12 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 		}
 	}
 
-	// All transactions in the block
-	transactions := fullBlock.Transactions
+	// All transactions in this block
+
+	transactions := make([]string, 0)
+	for _, transaction := range fullBlock.Transactions {
+		transactions = append(transactions, hex.EncodeToHex(transaction.MarshalRLP()))
+	}
 
 	// Receipts from this block
 	receipts, err := e.store.GetReceiptsByHash(header.Hash)
@@ -842,7 +855,7 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 
 	for account, accountData := range accounts {
 		if accountData.CodeHash != EmptyCodeHash {
-			contractCode, err := e.store.GetCode(header.StateRoot, types.StringToAddress(account))
+			contractCode, err := e.store.GetCode(previousHeader.StateRoot, types.StringToAddress(account))
 			if err != nil {
 				return nil, err
 			}
@@ -856,7 +869,7 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 
 	// Get state Merkle proofs for all accounts
 	for account := range accounts {
-		accountProof, err := e.store.GetAccountProof(header.StateRoot, types.StringToAddress(account))
+		accountProof, err := e.store.GetAccountProof(previousHeader.StateRoot, types.StringToAddress(account))
 		if err != nil {
 			return nil, err
 		}
@@ -872,13 +885,20 @@ func (e *Eth) GetProverData(block BlockNumberOrHash) (interface{}, error) {
 		})
 	}
 
+	chainId, err := e.ChainId()
+	if err != nil {
+		return nil, err
+	}
+
 	return &prover.ProverData{
-		BlockHeader:   *header,
-		Accounts:      accounts,
-		Storage:       storages,
-		Transactions:  transactions,
-		Receipts:      receipts,
-		ContractCodes: contractCodes,
-		State:         state,
+		ChainId:             chainId,
+		BlockHeader:         *header,
+		PreviousBlockHeader: *previousHeader,
+		Accounts:            accounts,
+		PreviousStorage:     storages,
+		Transactions:        transactions,
+		Receipts:            receipts,
+		ContractCodes:       contractCodes,
+		PreviousState:       state,
 	}, nil
 }
diff --git a/prover/prover.go b/prover/prover.go
index 0aac644ec1..78cf83f885 100644
--- a/prover/prover.go
+++ b/prover/prover.go
@@ -11,7 +11,6 @@ import (
 
 type StorageUpdate struct {
 	Slot        string
-	Value       string
 	MerkleProof []string
 }
 
@@ -34,13 +33,15 @@ type ProverAccountProof struct {
 }
 
 type ProverData struct {
-	BlockHeader   types.Header
-	Accounts      interface{}
-	Storage       interface{}
-	Transactions  interface{}
-	Receipts      interface{}
-	ContractCodes interface{}
-	State         interface{}
+	ChainId             interface{}
+	BlockHeader         types.Header
+	PreviousBlockHeader types.Header
+	Accounts            interface{}
+	PreviousStorage     interface{}
+	Transactions        interface{}
+	Receipts            interface{}
+	ContractCodes       interface{}
+	PreviousState       interface{}
 }
 
 func ParseBlockAccounts(block *types.Block) ([]string, error) {