diff --git a/README.md b/README.md
index 952c22c..fcce144 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Ancient interfaces are used for Ancient/frozen data operations (e.g. rawdb/table
 Outside of these primarily auxiliary capabilities, this package satisfies the interfaces required for many state operations using Ethereum data on IPFS.
 
 e.g.
- 
+
 go-ethereum trie.NodeIterator and state.NodeIterator can be constructed from the ethdb.KeyValueStore and ethdb.Database interfaces, respectively:
 
 ```go
@@ -42,7 +42,7 @@ package main
 
 import (
     "context"
-	
+
     "github.com/ethereum/go-ethereum/common"
     "github.com/ethereum/go-ethereum/core/state"
     "github.com/ethereum/go-ethereum/trie"
@@ -50,7 +50,7 @@ import (
     "github.com/ipfs/go-ipfs/core"
     "github.com/ipfs/go-ipfs/repo/fsrepo"
     "github.com/jmoiron/sqlx"
-    "github.com/vulcanize/ipfs-ethdb"
+    "github.com/vulcanize/ipfs-ethdb/v4"
 )
 
 func main() {
diff --git a/batch_test.go b/batch_test.go
index 259fc46..7f296dc 100644
--- a/batch_test.go
+++ b/batch_test.go
@@ -25,7 +25,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	ipfsethdb "github.com/vulcanize/ipfs-ethdb/v3"
+	ipfsethdb "github.com/vulcanize/ipfs-ethdb/v4"
 )
 
 var (
diff --git a/database_test.go b/database_test.go
index b3b8518..28c340f 100644
--- a/database_test.go
+++ b/database_test.go
@@ -26,7 +26,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	ipfsethdb "github.com/vulcanize/ipfs-ethdb/v3"
+	ipfsethdb "github.com/vulcanize/ipfs-ethdb/v4"
 )
 
 var (
diff --git a/go.mod b/go.mod
index 00843b0..1b97146 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/vulcanize/ipfs-ethdb/v3
+module github.com/vulcanize/ipfs-ethdb/v4
 
 go 1.15
 
diff --git a/postgres/batch.go b/postgres/batch.go
index 1ceeaf8..0099567 100644
--- a/postgres/batch.go
+++ b/postgres/batch.go
@@ -17,6 +17,8 @@
 package pgipfsethdb
 
 import (
+	"math/big"
+
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/jmoiron/sqlx"
 )
@@ -28,13 +30,16 @@ type Batch struct {
 	db        *sqlx.DB
 	tx        *sqlx.Tx
 	valueSize int
+
+	blockNumber *big.Int
 }
 
 // NewBatch returns a ethdb.Batch interface for PG-IPFS
-func NewBatch(db *sqlx.DB, tx *sqlx.Tx) ethdb.Batch {
+func NewBatch(db *sqlx.DB, tx *sqlx.Tx, blockNumber *big.Int) ethdb.Batch {
 	b := &Batch{
-		db: db,
-		tx: tx,
+		db:          db,
+		tx:          tx,
+		blockNumber: blockNumber,
 	}
 	if tx == nil {
 		b.Reset()
@@ -50,7 +55,7 @@ func (b *Batch) Put(key []byte, value []byte) (err error) {
 	if err != nil {
 		return err
 	}
-	if _, err = b.tx.Exec(putPgStr, mhKey, value); err != nil {
+	if _, err = b.tx.Exec(putPgStr, mhKey, value, b.blockNumber.Uint64()); err != nil {
 		return err
 	}
 	b.valueSize += len(value)
diff --git a/postgres/batch_test.go b/postgres/batch_test.go
index 199a183..e5ede9e 100644
--- a/postgres/batch_test.go
+++ b/postgres/batch_test.go
@@ -27,7 +27,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	pgipfsethdb "github.com/vulcanize/ipfs-ethdb/v3/postgres"
+	pgipfsethdb "github.com/vulcanize/ipfs-ethdb/v4/postgres"
 )
 
 var (
@@ -49,6 +49,11 @@ var _ = Describe("Batch", func() {
 		}
 
 		database = pgipfsethdb.NewDatabase(db, cacheConfig)
+
+		databaseWithBlock, ok := database.(*pgipfsethdb.Database)
+		Expect(ok).To(BeTrue())
+		(*databaseWithBlock).BlockNumber = testBlockNumber
+
 		batch = database.NewBatch()
 	})
 	AfterEach(func() {
diff --git a/postgres/database.go b/postgres/database.go
index a064961..321337f 100644
--- a/postgres/database.go
+++ b/postgres/database.go
@@ -20,6 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"math/big"
 	"strconv"
 	"strings"
 	"time"
@@ -32,9 +33,9 @@ import (
 var errNotSupported = errors.New("this operation is not supported")
 
 var (
-	hasPgStr    = "SELECT exists(select 1 from public.blocks WHERE key = $1)"
-	getPgStr    = "SELECT data FROM public.blocks WHERE key = $1"
-	putPgStr    = "INSERT INTO public.blocks (key, data) VALUES ($1, $2) ON CONFLICT (key) DO NOTHING"
+	hasPgStr    = "SELECT exists(select 1 from public.blocks WHERE key = $1 LIMIT 1)"
+	getPgStr    = "SELECT data FROM public.blocks WHERE key = $1 LIMIT 1"
+	putPgStr    = "INSERT INTO public.blocks (key, data, block_number) VALUES ($1, $2, $3) ON CONFLICT DO NOTHING"
 	deletePgStr = "DELETE FROM public.blocks WHERE key = $1"
 	dbSizePgStr = "SELECT pg_database_size(current_database())"
 )
@@ -45,6 +46,8 @@ var _ ethdb.Database = &Database{}
 type Database struct {
 	db    *sqlx.DB
 	cache *groupcache.Group
+
+	BlockNumber *big.Int
 }
 
 func (d *Database) ModifyAncients(f func(ethdb.AncientWriteOp) error) (int64, error) {
@@ -136,7 +139,7 @@ func (d *Database) Put(key []byte, value []byte) error {
 	if err != nil {
 		return err
 	}
-	_, err = d.db.Exec(putPgStr, mhKey, value)
+	_, err = d.db.Exec(putPgStr, mhKey, value, d.BlockNumber.Uint64())
 	return err
 }
 
@@ -245,13 +248,13 @@ func (d *Database) Compact(start []byte, limit []byte) error {
 // NewBatch creates a write-only database that buffers changes to its host db
 // until a final write is called
 func (d *Database) NewBatch() ethdb.Batch {
-	return NewBatch(d.db, nil)
+	return NewBatch(d.db, nil, d.BlockNumber)
 }
 
 // NewBatchWithSize satisfies the ethdb.Batcher interface.
 // NewBatchWithSize creates a write-only database batch with pre-allocated buffer.
 func (d *Database) NewBatchWithSize(size int) ethdb.Batch {
-	return NewBatch(d.db, nil)
+	return NewBatch(d.db, nil, d.BlockNumber)
 }
 
 // NewIterator satisfies the ethdb.Iteratee interface
diff --git a/postgres/database_test.go b/postgres/database_test.go
index 3ce5072..a1d9b2b 100644
--- a/postgres/database_test.go
+++ b/postgres/database_test.go
@@ -28,17 +28,18 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	pgipfsethdb "github.com/vulcanize/ipfs-ethdb/v3/postgres"
+	pgipfsethdb "github.com/vulcanize/ipfs-ethdb/v4/postgres"
 )
 
 var (
-	database     ethdb.Database
-	db           *sqlx.DB
-	err          error
-	testHeader   = types.Header{Number: big.NewInt(1337)}
-	testValue, _ = rlp.EncodeToBytes(testHeader)
-	testEthKey   = testHeader.Hash().Bytes()
-	testMhKey, _ = pgipfsethdb.MultihashKeyFromKeccak256(testEthKey)
+	database        ethdb.Database
+	db              *sqlx.DB
+	err             error
+	testBlockNumber = big.NewInt(1337)
+	testHeader      = types.Header{Number: testBlockNumber}
+	testValue, _    = rlp.EncodeToBytes(testHeader)
+	testEthKey      = testHeader.Hash().Bytes()
+	testMhKey, _    = pgipfsethdb.MultihashKeyFromKeccak256(testEthKey)
 )
 
 var _ = Describe("Database", func() {
@@ -53,6 +54,10 @@ var _ = Describe("Database", func() {
 		}
 
 		database = pgipfsethdb.NewDatabase(db, cacheConfig)
+
+		databaseWithBlock, ok := database.(*pgipfsethdb.Database)
+		Expect(ok).To(BeTrue())
+		(*databaseWithBlock).BlockNumber = testBlockNumber
 	})
 	AfterEach(func() {
 		groupcache.DeregisterGroup("db")
@@ -67,7 +72,7 @@ var _ = Describe("Database", func() {
 			Expect(has).ToNot(BeTrue())
 		})
 		It("returns true if a key-pair exists in the db", func() {
-			_, err = db.Exec("INSERT into public.blocks (key, data) VALUES ($1, $2)", testMhKey, testValue)
+			_, err = db.Exec("INSERT into public.blocks (key, data, block_number) VALUES ($1, $2, $3)", testMhKey, testValue, testBlockNumber.Uint64())
 			Expect(err).ToNot(HaveOccurred())
 			has, err := database.Has(testEthKey)
 			Expect(err).ToNot(HaveOccurred())
@@ -82,7 +87,7 @@ var _ = Describe("Database", func() {
 			Expect(err.Error()).To(ContainSubstring("sql: no rows in result set"))
 		})
 		It("returns the value associated with the key, if the pair exists", func() {
-			_, err = db.Exec("INSERT into public.blocks (key, data) VALUES ($1, $2)", testMhKey, testValue)
+			_, err = db.Exec("INSERT into public.blocks (key, data, block_number) VALUES ($1, $2, $3)", testMhKey, testValue, testBlockNumber.Uint64())
 			Expect(err).ToNot(HaveOccurred())
 			val, err := database.Get(testEthKey)
 			Expect(err).ToNot(HaveOccurred())
diff --git a/postgres/doc.md b/postgres/doc.md
index cf68683..a9c6d9d 100644
--- a/postgres/doc.md
+++ b/postgres/doc.md
@@ -18,7 +18,7 @@ import (
     "github.com/ethereum/go-ethereum/core/state"
     "github.com/ethereum/go-ethereum/trie"
     "github.com/jmoiron/sqlx"
-    "github.com/vulcanize/ipfs-ethdb/v3/postgres"
+    "github.com/vulcanize/ipfs-ethdb/v4/postgres"
 )
 
 func main() {