diff --git a/.gitignore b/.gitignore
index c378da3..8234cf7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .DS_Store
 coverage.txt
-.vscode
\ No newline at end of file
+.vscode
+.idea
diff --git a/README.md b/README.md
index 134f7fc..489a68b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
+Changes from upstream and other notes:
+* Fixes [#81](https://github.com/qri-io/jsonschema/issues/81)
+* I have looked at [*76](https://github.com/qri-io/jsonschema/issues/76) / [#80](https://github.com/qri-io/jsonschema/issues/80). My opinion, after reading the code, is that the global schema registry (which is the source of these concurrency issues) only gets involved when you have "$ref" elements. Since we only run this against schemas we write / generate, and I can guarantee that we don't generate "$ref" elements, this shouldn't be an issue for us, and we should be able to use this library across goroutines without additional synchronization
+* [#91](https://github.com/qri-io/jsonschema/issues/91) may still be an issue, but I don't understand from reading it exactly what the problem is
+* Fixes [#53](https://github.com/qri-io/jsonschema/issues/53) by adding a ValidateReader method that takes an io.Reader
+
+
 # jsonschema
 [![Qri](https://img.shields.io/badge/made%20by-qri-magenta.svg?style=flat-square)](https://qri.io)
 [![GoDoc](https://godoc.org/github.com/qri-io/jsonschema?status.svg)](http://godoc.org/github.com/qri-io/jsonschema)
diff --git a/keywords_object.go b/keywords_object.go
index 62ce0de..1627dba 100644
--- a/keywords_object.go
+++ b/keywords_object.go
@@ -326,7 +326,7 @@ func (ap *AdditionalProperties) ValidateKeyword(ctx context.Context, currentStat
 				continue
 			}
 			if ap.schemaType == schemaTypeFalse {
-				currentState.AddError(data, "additional properties are not allowed")
+				currentState.AddError(data, "additional properties are not allowed: "+key)
 				return
 			}
 			currentState.SetEvaluatedKey(key)
@@ -669,7 +669,7 @@ func (up *UnevaluatedProperties) ValidateKeyword(ctx context.Context, currentSta
 				continue
 			}
 			if up.schemaType == schemaTypeFalse {
-				currentState.AddError(data, "unevaluated properties are not allowed")
+				currentState.AddError(data, "unevaluated properties are not allowed: "+key)
 				return
 			}
 			subState.DescendInstanceFromState(currentState, key)
diff --git a/modo_test.go b/modo_test.go
new file mode 100644
index 0000000..e001240
--- /dev/null
+++ b/modo_test.go
@@ -0,0 +1,41 @@
+package jsonschema
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"io/fs"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLoadingGeneratedSchemas(t *testing.T) {
+	t.Parallel()
+
+	filesystem := os.DirFS("testdata")
+	_ = fs.WalkDir(filesystem, "modo", func(path string, d fs.DirEntry, err error) error {
+		require.NoError(t, err)
+		if d.IsDir() {
+			return nil
+		}
+
+		t.Run(path, func(t *testing.T) {
+			assert.NotEqual(t, "", d.Name())
+			f, err := filesystem.Open(path)
+			require.NoError(t, err)
+			data, err := io.ReadAll(f)
+			require.NoError(t, err)
+
+			var s Schema
+			err = json.Unmarshal(data, &s)
+			require.NoError(t, err)
+
+			_, err = s.ValidateBytes(context.Background(), []byte(`{}`))
+			require.NoError(t, err)
+		})
+		return nil
+	})
+}
diff --git a/schema.go b/schema.go
index 751a63f..486ae3f 100644
--- a/schema.go
+++ b/schema.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/url"
 	"sort"
 	"strings"
@@ -331,6 +332,17 @@ func (s *Schema) ValidateBytes(ctx context.Context, data []byte) ([]KeyError, er
 	return *vs.Errs, nil
 }
 
+// ValidateReader performs schema validation against a stream of json
+// byte data
+func (s *Schema) ValidateReader(ctx context.Context, data io.Reader) ([]KeyError, error) {
+	var doc interface{}
+	if err := json.NewDecoder(data).Decode(&doc); err != nil {
+		return nil, fmt.Errorf("error parsing JSON bytes: %w", err)
+	}
+	vs := s.Validate(ctx, doc)
+	return *vs.Errs, nil
+}
+
 // TopLevelType returns a string representing the schema's top-level type.
 func (s *Schema) TopLevelType() string {
 	if t, ok := s.keywords["type"].(*Type); ok {
diff --git a/testdata/modo/app_session-session.json b/testdata/modo/app_session-session.json
new file mode 100644
index 0000000..d9e2d39
--- /dev/null
+++ b/testdata/modo/app_session-session.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"device_identifier":{"description":"mobile device/app identifier","type":"string"},"ip_address":{"description":"ip address of the session","type":"string"},"payment_frame_size":{"required":["height","width"],"type":"object","properties":{"height":{"type":"number"},"unit":{"type":"string","default":"pixel"},"width":{"type":"number"}},"additionalProperties":false}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/bank_direct_details-payment.json b/testdata/modo/bank_direct_details-payment.json
new file mode 100644
index 0000000..f72ed83
--- /dev/null
+++ b/testdata/modo/bank_direct_details-payment.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","required":["debitor_account_number","debitor_account_type","debitor_bank_id_code"],"type":"object","properties":{"bank_network":{"description":"The network by which the payment will be cleared.  Such as SEPA or ACH.","type":"string"},"country":{"description":"ISO-3166 Alpha-2 Country Code","type":"string"},"creditor_account_number":{"description":"Account number at a given bank for the recipient of funds, likely an IBAN if outside the U.S. and Canada. This is an optional field and would override any previously configured merchant account information","type":"string"},"creditor_bank_id_code":{"description":"Bank identifier of the bank in which funds will be credited, sometimes referred to as a routing number in the US or BIC elsewhere. This is an optional field and would override any previously configured merchant account information","type":"string"},"debitor_account_number":{"description":"Account number at a given bank for the source of funds, likely an IBAN if outside the U.S. and Canada.","type":"string"},"debitor_account_type":{"description":"Account number at a given bank for the source of funds, likely an IBAN if outside the U.S. and Canada.","type":"string"},"debitor_bank_id_code":{"description":"Bank identifier of the bank in which funds will be debited, sometimes referred to as a routing number in the US or BIC elsewhere.","type":"string"},"payment_information":{"description":"a description or note for the bank direct payment being made","type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/bank_direct_psp_response-paymentResponse.json b/testdata/modo/bank_direct_psp_response-paymentResponse.json
new file mode 100644
index 0000000..20916f8
--- /dev/null
+++ b/testdata/modo/bank_direct_psp_response-paymentResponse.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"bank_response_reason":{"description":"the response/reason from the acquirer bank","type":"string"},"payment_method":{"type":"string"},"psp_name":{"description":"Name of the payment service provider","type":"string"},"response_time":{"description":"The delta (in seconds) between when Modo sends a request to psp and receives the response","type":"number"},"status_code":{"description":"The status code returned during the processing of the payment","type":"string"},"status_message":{"description":"The status message (human readable) returned during the processing of the payment","type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/card_details-payment.json b/testdata/modo/card_details-payment.json
new file mode 100644
index 0000000..dcecc1f
--- /dev/null
+++ b/testdata/modo/card_details-payment.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","description":"A credit, debit or prepaid card issued on a network (like Visa or Mastercard) by one or more banks.","required":["card_number","expiration_date"],"type":"object","properties":{"brand":{"description":"The brand of the card","type":"string"},"card_number":{"type":"string"},"card_type":{"description":"type of card being used (credit, debit, pre-paid)","type":"string"},"country":{"description":"ISO-3166 Alpha-2 Country Code","type":"string"},"expiration_date":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/card_psp_response-paymentResponse.json b/testdata/modo/card_psp_response-paymentResponse.json
new file mode 100644
index 0000000..242d06b
--- /dev/null
+++ b/testdata/modo/card_psp_response-paymentResponse.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"acquirer_response_code":{"description":"the raw acquirer response code to the authorization request","type":"string"},"address_verification_response_code":{"description":"This is the AVs response code","type":"string"},"authorization_id":{"description":"id assigned by the acquirer for the authorization","type":"string"},"available_balance":{"type":"object","properties":{"currency":{"type":"object","properties":{"currency_code":{"type":"object","properties":{"isocode":{"type":"string"}},"additionalProperties":false},"decimal_places":{"type":"integer"},"name":{"type":"string"},"separator":{"type":"string"},"symbol":{"type":"string"}},"additionalProperties":false},"value":{"type":"integer"}},"additionalProperties":false},"card_verification_response_code":{"description":"This is the CVV2 response code","type":"string"},"international_card_flag":{"description":"This flag indicates if this transaction was made with a international card","type":"boolean"},"network_unique_id":{"description":"Global or domestic network id assigned to the transaction","type":"string"},"payment_method":{"type":"string"},"prepaid_card_flag":{"description":"This flag indicates if this transaction was made with a pre-paid card","type":"boolean"},"psp_name":{"description":"Name of the payment service provider","type":"string"},"response_time":{"description":"The delta (in seconds) between when Modo sends a request to psp and receives the response","type":"number"},"status_code":{"description":"The status code returned during the processing of the payment","type":"string"},"status_message":{"description":"The status message (human readable) returned during the processing of the payment","type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/card_verification_details-paymentVerification.json b/testdata/modo/card_verification_details-paymentVerification.json
new file mode 100644
index 0000000..49b4671
--- /dev/null
+++ b/testdata/modo/card_verification_details-paymentVerification.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","description":"Verification details for a card","type":"object","properties":{"card_verification_code":{"description":"Plaintext card verification code","type":"string"},"device_fingerprint_ref":{"description":"A fingerprint of the device used for card verification (necessary for 3DS scenarios)","type":"string"},"emv_data":{"description":"data sent in specific to chip card transactions","type":"string"},"pin_block":{"description":"card pin block","type":"string"},"track_1":{"description":"1st track on the card magstripe","type":"string"},"track_2":{"description":"2nd track on the card magstripe","type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_airfare-order.json b/testdata/modo/line_item_details_airfare-order.json
new file mode 100644
index 0000000..c5da575
--- /dev/null
+++ b/testdata/modo/line_item_details_airfare-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"agency_invoice_number":{"type":"string"},"agency_plan_name":{"type":"string"},"airline_code":{"type":"string"},"airline_designator_code":{"type":"string"},"cabin_class":{"type":"string"},"customer_reference_identifier":{"type":"string"},"itinerary":{"type":"array","items":{"type":"object","properties":{"arrival_time":{"type":"string","format":"date-time"},"departure_time":{"type":"string","format":"date-time"},"destination_airport_city":{"type":"string"},"destination_airport_code":{"type":"string"},"flight_number":{"type":"string"},"origin_airport_city":{"type":"string"},"origin_airport_code":{"type":"string"},"seat_assignment":{"type":"string"}},"additionalProperties":false}},"ticket_number":{"type":"string"},"travel_agency_code":{"type":"string"},"travel_agency_name":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_cashback-order.json b/testdata/modo/line_item_details_cashback-order.json
new file mode 100644
index 0000000..57e4490
--- /dev/null
+++ b/testdata/modo/line_item_details_cashback-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"product_id":{"type":"string"},"your_product_reference":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_fuel-order.json b/testdata/modo/line_item_details_fuel-order.json
new file mode 100644
index 0000000..d72c680
--- /dev/null
+++ b/testdata/modo/line_item_details_fuel-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"fuel_grade":{"type":"string"},"product_id":{"type":"string"},"service_level":{"type":"string"},"unit_of_measure":{"type":"string"},"your_product_reference":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_invoice-order.json b/testdata/modo/line_item_details_invoice-order.json
new file mode 100644
index 0000000..40cd291
--- /dev/null
+++ b/testdata/modo/line_item_details_invoice-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"customer_identifier":{"type":"string"},"invoice_date":{"type":"string","format":"date"},"invoice_identifier":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_product-order.json b/testdata/modo/line_item_details_product-order.json
new file mode 100644
index 0000000..1201ddd
--- /dev/null
+++ b/testdata/modo/line_item_details_product-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"SKU":{"type":"string"},"manufacturer":{"type":"string"},"model":{"type":"string"},"serial_number":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_shipping-order.json b/testdata/modo/line_item_details_shipping-order.json
new file mode 100644
index 0000000..92c2c75
--- /dev/null
+++ b/testdata/modo/line_item_details_shipping-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"shipping_date":{"type":"string"},"shipping_method":{"type":"string"},"your_shipping_reference":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_subscription-order.json b/testdata/modo/line_item_details_subscription-order.json
new file mode 100644
index 0000000..ec66635
--- /dev/null
+++ b/testdata/modo/line_item_details_subscription-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"description":{"type":"string"},"frequency":{"type":"string"},"subscription_name":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/line_item_details_tax-order.json b/testdata/modo/line_item_details_tax-order.json
new file mode 100644
index 0000000..57e4490
--- /dev/null
+++ b/testdata/modo/line_item_details_tax-order.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"product_id":{"type":"string"},"your_product_reference":{"type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/offline_session-session.json b/testdata/modo/offline_session-session.json
new file mode 100644
index 0000000..49d0fba
--- /dev/null
+++ b/testdata/modo/offline_session-session.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"application_name":{"description":"the name of the system requesting checkout.","type":"string"},"ip_address":{"description":"originating IP address of the session","type":"string"},"system_id":{"description":"the identifier of the system requesting the checkout.","type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/ps_adyen_details-paymentService.json b/testdata/modo/ps_adyen_details-paymentService.json
new file mode 100644
index 0000000..b9c7caf
--- /dev/null
+++ b/testdata/modo/ps_adyen_details-paymentService.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","description":"The payment service uses this field for payment specific","type":"object","properties":{"ps_payment_options":{"description":"Sometimes a payment_service has a reference or optional value for a payment associated with optional services that you may want to take advantage of (fraud flags, purchase financing, installment plans).  Use this to communicate those options to the payment_service.\n//     ","type":"object","properties":{"option_type":{"description":"The type of payments option","type":"string"},"option_value":{"description":"The actual option value","type":"string"}},"additionalProperties":false},"settlement_splits":{"type":"array","items":{"type":"object","properties":{"account":{"description":"If split_type is MarketPlace, the account_id for the accountholder's settlement account must be provided","type":"string"},"amount":{"type":"object","properties":{"currency":{"type":"object","properties":{"currency_code":{"type":"object","properties":{"isocode":{"type":"string"}},"additionalProperties":false},"decimal_places":{"type":"integer"},"name":{"type":"string"},"separator":{"type":"string"},"symbol":{"type":"string"}},"additionalProperties":false},"value":{"type":"integer"}},"additionalProperties":false},"reference":{"description":"The reference of this split. Used to link other operations (e.g. captures and refunds) to this split.","type":"string"},"split_type":{"type":"string"}},"additionalProperties":false}}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/terminal_session-session.json b/testdata/modo/terminal_session-session.json
new file mode 100644
index 0000000..909978d
--- /dev/null
+++ b/testdata/modo/terminal_session-session.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"ip_address":{"description":"IP address of the session","type":"string"},"lane":{"description":"your lane identifier","type":"string"},"register":{"description":"your register identifier","type":"string"},"terminal_id":{"description":"your terminal identifier","type":"string"}},"additionalProperties":false}
\ No newline at end of file
diff --git a/testdata/modo/web_session-session.json b/testdata/modo/web_session-session.json
new file mode 100644
index 0000000..21d2269
--- /dev/null
+++ b/testdata/modo/web_session-session.json
@@ -0,0 +1 @@
+{"$schema":"https://json-schema.org/draft/2019-09/schema","type":"object","properties":{"browser":{"type":"object","properties":{"accept_header":{"type":"string"},"user_agent":{"type":"string"}},"additionalProperties":false},"cookie":{"type":"string"},"ip_address":{"description":"ip address of the session","type":"string"},"payment_frame_size":{"required":["height","width"],"type":"object","properties":{"height":{"type":"number"},"unit":{"type":"string","default":"pixel"},"width":{"type":"number"}},"additionalProperties":false}},"additionalProperties":false}
\ No newline at end of file