diff --git a/acme/db/db.go b/acme/db/db.go
new file mode 100644
index 00000000..2882fcf4
--- /dev/null
+++ b/acme/db/db.go
@@ -0,0 +1,31 @@
+package acme
+
+import "context"
+
+// DB is the DB interface expected by the step-ca ACME API.
+type DB interface {
+	CreateAccount(ctx context.Context, acc *Account) (*Account, error)
+	GetAccount(ctx context.Context, id string) (*Account, error)
+	GetAccountByKeyID(ctx context.Context) (*Account, error)
+	UpdateAccount(ctx context.Context, acc *Account) error
+
+	CreateNonce(ctx context.Context) (Nonce, error)
+	DeleteNonce(ctx context.Context, nonce Nonce) error
+
+	CreateAuthorization(ctx context.Context, authz *Authorization) error
+	GetAuthorization(ctx context.Context, id string) (*Authorization, error)
+	UpdateAuthorization(ctx context.Context, authz *Authorization) error
+
+	CreateCertificate(ctx context.Context, cert *Certificate) error
+	GetCertificate(ctx context.Context, id string) (*Certificate, error)
+
+	CreateChallenge(ctx context.Context, ch *Challenge) error
+	GetChallenge(ctx context.Context, id string) (*Challenge, error)
+	UpdateChallenge(ctx context.Context, ch *Challenge) error
+
+	CreateOrder(ctx context.Context, o *Order) error
+	DeleteOrder(ctx context.Context, id string) error
+	GetOrder(ctx context.Context, id string) (*Order, error)
+	GetOrdersByAccountID(ctx context.Context, accountID string) error
+	UpdateOrder(ctx context.Context, o *Order) error
+}
diff --git a/acme/db/nosql/account.go b/acme/db/nosql/account.go
new file mode 100644
index 00000000..dcbfd2f5
--- /dev/null
+++ b/acme/db/nosql/account.go
@@ -0,0 +1,138 @@
+package nosql
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"github.com/pkg/errors"
+	nosqlDB "github.com/smallstep/nosql"
+	"go.step.sm/crypto/jose"
+)
+
+// dbAccount represents an ACME account.
+type dbAccount struct {
+	ID          string           `json:"id"`
+	Created     time.Time        `json:"created"`
+	Deactivated time.Time        `json:"deactivated"`
+	Key         *jose.JSONWebKey `json:"key"`
+	Contact     []string         `json:"contact,omitempty"`
+	Status      string           `json:"status"`
+}
+
+func (db *DB) saveAccount(nu *dbAccount, old *dbAccount) error {
+	var (
+		err  error
+		oldB []byte
+	)
+	if old == nil {
+		oldB = nil
+	} else {
+		if oldB, err = json.Marshal(old); err != nil {
+			return ServerInternalErr(errors.Wrap(err, "error marshaling old acme order"))
+		}
+	}
+
+	b, err := json.Marshal(*nu)
+	if err != nil {
+		return errors.Wrap(err, "error marshaling new account object")
+	}
+	// Set the Account
+	_, swapped, err := db.CmpAndSwap(accountTable, []byte(nu.ID), oldB, b)
+	switch {
+	case err != nil:
+		return ServerInternalErr(errors.Wrap(err, "error storing account"))
+	case !swapped:
+		return ServerInternalErr(errors.New("error storing account; " +
+			"value has changed since last read"))
+	default:
+		return nil
+	}
+}
+
+// CreateAccount imlements the AcmeDB.CreateAccount interface.
+func (db *DB) CreateAccount(ctx context.Context, acc *Account) error {
+	id, err := randID()
+	if err != nil {
+		return nil, err
+	}
+
+	dba := &dbAccount{
+		ID:      id,
+		Key:     acc.Key,
+		Contact: acc.Contact,
+		Status:  acc.Valid,
+		Created: clock.Now(),
+	}
+
+	kid, err := keyToID(dba.Key)
+	if err != nil {
+		return err
+	}
+	kidB := []byte(kid)
+
+	// Set the jwkID -> acme account ID index
+	_, swapped, err := db.db.CmpAndSwap(accountByKeyIDTable, kidB, nil, []byte(a.ID))
+	switch {
+	case err != nil:
+		return ServerInternalErr(errors.Wrap(err, "error setting key-id to account-id index"))
+	case !swapped:
+		return ServerInternalErr(errors.Errorf("key-id to account-id index already exists"))
+	default:
+		if err = db.saveAccount(dba, nil); err != nil {
+			db.db.Del(accountByKeyIDTable, kidB)
+			return err
+		}
+		return nil
+	}
+}
+
+// UpdateAccount imlements the AcmeDB.UpdateAccount interface.
+func (db *DB) UpdateAccount(ctx context.Context, acc *Account) error {
+	kid, err := keyToID(dba.Key)
+	if err != nil {
+		return err
+	}
+
+	dba, err := db.db.getAccountByKeyID(ctx, kid)
+
+	newdba := *dba
+	newdba.Contact = acc.contact
+	newdba.Status = acc.Status
+
+	// If the status has changed to 'deactivated', then set deactivatedAt timestamp.
+	if acc.Status == types.StatusDeactivated && dba.Status != types.Status.Deactivated {
+		newdba.Deactivated = clock.Now()
+	}
+
+	return db.saveAccount(newdba, dba)
+}
+
+// getAccountByID retrieves the account with the given ID.
+func (db *DB) getAccountByID(ctx context.Context, id string) (*dbAccount, error) {
+	ab, err := db.db.Get(accountTable, []byte(id))
+	if err != nil {
+		if nosqlDB.IsErrNotFound(err) {
+			return nil, MalformedErr(errors.Wrapf(err, "account %s not found", id))
+		}
+		return nil, ServerInternalErr(errors.Wrapf(err, "error loading account %s", id))
+	}
+
+	a := new(account)
+	if err = json.Unmarshal(ab, a); err != nil {
+		return nil, ServerInternalErr(errors.Wrap(err, "error unmarshaling account"))
+	}
+	return a, nil
+}
+
+// getAccountByKeyID retrieves Id associated with the given Kid.
+func (db *DB) getAccountByKeyID(ctx context.Context, kid string) (*dbAccount, error) {
+	id, err := db.db.Get(accountByKeyIDTable, []byte(kid))
+	if err != nil {
+		if nosqlDB.IsErrNotFound(err) {
+			return nil, MalformedErr(errors.Wrapf(err, "account with key id %s not found", kid))
+		}
+		return nil, ServerInternalErr(errors.Wrapf(err, "error loading key-account index"))
+	}
+	return getAccountByID(db, string(id))
+}
diff --git a/acme/db/nosql/authz.go b/acme/db/nosql/authz.go
new file mode 100644
index 00000000..e69de29b
diff --git a/acme/db/nosql/certificate.go b/acme/db/nosql/certificate.go
new file mode 100644
index 00000000..e69de29b
diff --git a/acme/db/nosql/challenge.go b/acme/db/nosql/challenge.go
new file mode 100644
index 00000000..e69de29b
diff --git a/acme/db/nosql/nonce.go b/acme/db/nosql/nonce.go
new file mode 100644
index 00000000..3459f212
--- /dev/null
+++ b/acme/db/nosql/nonce.go
@@ -0,0 +1,74 @@
+package nosql
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"time"
+
+	"github.com/pkg/errors"
+	nosqlDB "github.com/smallstep/nosql"
+	"github.com/smallstep/nosql/database"
+)
+
+// dbNonce contains nonce metadata used in the ACME protocol.
+type dbNonce struct {
+	ID      string
+	Created time.Time
+}
+
+// CreateNonce creates, stores, and returns an ACME replay-nonce.
+// Implements the acme.DB interface.
+func (db *DB) CreateNonce() (Nonce, error) {
+	_id, err := randID()
+	if err != nil {
+		return nil, err
+	}
+
+	id := base64.RawURLEncoding.EncodeToString([]byte(_id))
+	n := &dbNonce{
+		ID:      id,
+		Created: clock.Now(),
+	}
+	b, err := json.Marshal(n)
+	if err != nil {
+		return nil, ServerInternalErr(errors.Wrap(err, "error marshaling nonce"))
+	}
+	_, swapped, err := db.CmpAndSwap(nonceTable, []byte(id), nil, b)
+	switch {
+	case err != nil:
+		return nil, ServerInternalErr(errors.Wrap(err, "error storing nonce"))
+	case !swapped:
+		return nil, ServerInternalErr(errors.New("error storing nonce; " +
+			"value has changed since last read"))
+	default:
+		return Nonce(id), nil
+	}
+}
+
+// DeleteNonce verifies that the nonce is valid (by checking if it exists),
+// and if so, consumes the nonce resource by deleting it from the database.
+func (db *DB) DeleteNonce(nonce string) error {
+	err := db.db.Update(&database.Tx{
+		Operations: []*database.TxEntry{
+			{
+				Bucket: nonceTable,
+				Key:    []byte(nonce),
+				Cmd:    database.Get,
+			},
+			{
+				Bucket: nonceTable,
+				Key:    []byte(nonce),
+				Cmd:    database.Delete,
+			},
+		},
+	})
+
+	switch {
+	case nosqlDB.IsErrNotFound(err):
+		return BadNonceErr(nil)
+	case err != nil:
+		return ServerInternalErr(errors.Wrapf(err, "error deleting nonce %s", nonce))
+	default:
+		return nil
+	}
+}
diff --git a/acme/db/nosql/nosql.go b/acme/db/nosql/nosql.go
new file mode 100644
index 00000000..8bfd1a66
--- /dev/null
+++ b/acme/db/nosql/nosql.go
@@ -0,0 +1,10 @@
+package nosql
+
+import (
+	nosqlDB "github.com/smallstep/nosql"
+)
+
+// DB is a struct that implements the AcmeDB interface.
+type DB struct {
+	db nosqlDB.DB
+}
diff --git a/acme/db/nosql/order.go b/acme/db/nosql/order.go
new file mode 100644
index 00000000..e69de29b
diff --git a/acme/types/account.go b/acme/types/account.go
new file mode 100644
index 00000000..ea40a646
--- /dev/null
+++ b/acme/types/account.go
@@ -0,0 +1,66 @@
+package acme
+
+import (
+	"encoding/json"
+
+	"github.com/pkg/errors"
+	"go.step.sm/crypto/jose"
+)
+
+// Account is a subset of the internal account type containing only those
+// attributes required for responses in the ACME protocol.
+type Account struct {
+	Contact []string         `json:"contact,omitempty"`
+	Status  string           `json:"status"`
+	Orders  string           `json:"orders"`
+	ID      string           `json:"-"`
+	Key     *jose.JSONWebKey `json:"-"`
+}
+
+// ToLog enables response logging.
+func (a *Account) ToLog() (interface{}, error) {
+	b, err := json.Marshal(a)
+	if err != nil {
+		return nil, ServerInternalErr(errors.Wrap(err, "error marshaling account for logging"))
+	}
+	return string(b), nil
+}
+
+// GetID returns the account ID.
+func (a *Account) GetID() string {
+	return a.ID
+}
+
+// GetKey returns the JWK associated with the account.
+func (a *Account) GetKey() *jose.JSONWebKey {
+	return a.Key
+}
+
+// IsValid returns true if the Account is valid.
+func (a *Account) IsValid() bool {
+	return a.Status == StatusValid
+}
+
+// AccountOptions are the options needed to create a new ACME account.
+type AccountOptions struct {
+	Key     *jose.JSONWebKey
+	Contact []string
+}
+
+// AccountUpdateOptions are the options needed to update an existing ACME account.
+type AccountUpdateOptions struct {
+	Contact []string
+	Status  types.Status
+}
+
+// toACME converts the internal Account type into the public acmeAccount
+// type for presentation in the ACME protocol.
+//func (a *account) toACME(ctx context.Context, db nosql.DB, dir *directory) (*Account, error) {
+//	return &Account{
+//		Status:  a.Status,
+//		Contact: a.Contact,
+//		Orders:  dir.getLink(ctx, OrdersByAccountLink, true, a.ID),
+//		Key:     a.Key,
+//		ID:      a.ID,
+//	}, nil
+//}
diff --git a/acme/types/authz.go b/acme/types/authz.go
new file mode 100644
index 00000000..3e3a5aa7
--- /dev/null
+++ b/acme/types/authz.go
@@ -0,0 +1,32 @@
+package types
+
+import (
+	"encoding/json"
+
+	"github.com/pkg/errors"
+)
+
+// Authz is a subset of the Authz type containing only those attributes
+// required for responses in the ACME protocol.
+type Authz struct {
+	Identifier Identifier   `json:"identifier"`
+	Status     string       `json:"status"`
+	Expires    string       `json:"expires"`
+	Challenges []*Challenge `json:"challenges"`
+	Wildcard   bool         `json:"wildcard"`
+	ID         string       `json:"-"`
+}
+
+// ToLog enables response logging.
+func (a *Authz) ToLog() (interface{}, error) {
+	b, err := json.Marshal(a)
+	if err != nil {
+		return nil, ServerInternalErr(errors.Wrap(err, "error marshaling authz for logging"))
+	}
+	return string(b), nil
+}
+
+// GetID returns the Authz ID.
+func (a *Authz) GetID() string {
+	return a.ID
+}
diff --git a/acme/types/nonce.go b/acme/types/nonce.go
new file mode 100644
index 00000000..4234e818
--- /dev/null
+++ b/acme/types/nonce.go
@@ -0,0 +1,3 @@
+package acme
+
+type Nonce string