diff --git a/Server-Protocol-Buffer/src/main/proto/internal/evreg/event.proto b/Server-Protocol-Buffer/src/main/proto/internal/evreg/event.proto
index c567f95503d0f796208d793bea5bdf2b01fae877..6f27b53757939fcc3ab01cc322a72b9f262a47a3 100644
--- a/Server-Protocol-Buffer/src/main/proto/internal/evreg/event.proto
+++ b/Server-Protocol-Buffer/src/main/proto/internal/evreg/event.proto
@@ -4,9 +4,22 @@ package de.rki.coronawarnapp.server.protocols.internal.evreg;
 
 
 message Event {
+  // 16 random bytes
   bytes guid = 1;
-  string description = 2;
-  uint32 start = 3;
-  uint32 end = 4;
-  uint32 defaultCheckInLengthInMinutes = 5;
+  EventType type = 2;
+  // max. 150 characters
+  string description = 3;
+  // max. 150 characters
+  string address = 4;
+  // UNIX timestamp (in seconds)
+  uint64 start = 5;
+  // UNIX timestamp (in seconds)
+  uint64 end = 6;
+  uint32 defaultCheckInLengthInMinutes = 7;
+}
+
+enum EventType {
+  EVENT_TYPE_UNSPECIFIED = 0;
+  EVENT_TYPE_OTHER_EVENT = 1;
+  EVENT_TYPE_OTHER_LOCATION = 2;
 }
\ No newline at end of file
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/evreg/poster_template.proto b/Server-Protocol-Buffer/src/main/proto/internal/evreg/poster_template.proto
new file mode 100644
index 0000000000000000000000000000000000000000..676245d60fe150d5d90963bd90bccb0eeeb64f6e
--- /dev/null
+++ b/Server-Protocol-Buffer/src/main/proto/internal/evreg/poster_template.proto
@@ -0,0 +1,24 @@
+// This file is auto-generated, DO NOT make any changes here
+syntax = "proto3";
+package de.rki.coronawarnapp.server.protocols.internal.evreg;
+
+
+message PosterTemplateAndroid {
+  // SVG
+  bytes template = 1;
+
+  float offsetX = 2;
+  float offsetY = 3;
+
+  uint32 qrCodeSideLength = 4;
+}
+
+message PosterTemplateIOS {
+  // PDF
+  bytes template = 1;
+
+  uint32 offsetX = 2;
+  uint32 offsetY = 3;
+
+  uint32 qrCodeSideLength = 4;
+}
\ No newline at end of file
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/pt/check_in.proto b/Server-Protocol-Buffer/src/main/proto/internal/pt/check_in.proto
new file mode 100644
index 0000000000000000000000000000000000000000..6f809744639b23ec376a36683c832a6c0265675b
--- /dev/null
+++ b/Server-Protocol-Buffer/src/main/proto/internal/pt/check_in.proto
@@ -0,0 +1,12 @@
+// This file is auto-generated, DO NOT make any changes here
+syntax = "proto3";
+package de.rki.coronawarnapp.server.protocols.internal.pt;
+
+import "internal/pt/trace_location.proto";
+
+message CheckIn {
+  SignedTraceLocation signedLocation = 1;
+  uint32 startIntervalNumber = 2;
+  uint32 endIntervalNumber = 3;
+  uint32 transmissionRiskLevel = 4;
+}
\ No newline at end of file
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/pt/qr_code_poster_template.proto b/Server-Protocol-Buffer/src/main/proto/internal/pt/qr_code_poster_template.proto
new file mode 100644
index 0000000000000000000000000000000000000000..dcc4a40cb50ea30567a7d536d690b866f19ab16e
--- /dev/null
+++ b/Server-Protocol-Buffer/src/main/proto/internal/pt/qr_code_poster_template.proto
@@ -0,0 +1,50 @@
+// This file is auto-generated, DO NOT make any changes here
+syntax = "proto3";
+package de.rki.coronawarnapp.server.protocols.internal.pt;
+
+
+message QRCodePosterTemplateAndroid {
+  // SVG
+  bytes template = 1;
+
+  float offsetX = 2;
+  float offsetY = 3;
+
+  uint32 qrCodeSideLength = 4;
+
+  QRCodeTextBoxAndroid description = 5;
+
+  message QRCodeTextBoxAndroid {
+    uint32 offsetX = 1;
+    uint32 offsetY = 2;
+
+    uint32 width = 3;
+    uint32 height = 4;
+
+    uint32 fontSize = 5;
+    string fontColor = 6;
+  }
+}
+
+message QRCodePosterTemplateIOS {
+  // PDF
+  bytes template = 1;
+
+  uint32 offsetX = 2;
+  uint32 offsetY = 3;
+
+  uint32 qrCodeSideLength = 4;
+
+  QRCodeTextBoxIOS description = 5;
+
+  message QRCodeTextBoxIOS {
+    uint32 offsetX = 1;
+    uint32 offsetY = 2;
+
+    uint32 width = 3;
+    uint32 height = 4;
+
+    uint32 fontSize = 5;
+    string fontColor = 6;
+  }
+}
\ No newline at end of file
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/pt/trace_location.proto b/Server-Protocol-Buffer/src/main/proto/internal/pt/trace_location.proto
new file mode 100644
index 0000000000000000000000000000000000000000..3785e9a83aecd850a22b502e125a197d3d06bd1c
--- /dev/null
+++ b/Server-Protocol-Buffer/src/main/proto/internal/pt/trace_location.proto
@@ -0,0 +1,44 @@
+// This file is auto-generated, DO NOT make any changes here
+syntax = "proto3";
+package de.rki.coronawarnapp.server.protocols.internal.pt;
+
+
+message TraceLocation {
+  // uuid
+  string guid = 1;
+  uint32 version = 2;
+  TraceLocationType type = 3;
+  // max. 150 characters
+  string description = 4;
+  // max. 150 characters
+  string address = 5;
+  // UNIX timestamp (in seconds)
+  uint64 startTimestamp = 6;
+  // UNIX timestamp (in seconds)
+  uint64 endTimestamp = 7;
+  uint32 defaultCheckInLengthInMinutes = 8;
+}
+
+message SignedTraceLocation {
+  TraceLocation location = 1;
+  bytes signature = 2;
+}
+
+enum TraceLocationType {
+  LOCATION_TYPE_UNSPECIFIED = 0;
+  LOCATION_TYPE_PERMANENT_OTHER = 1;
+  LOCATION_TYPE_TEMPORARY_OTHER = 2;
+
+  LOCATION_TYPE_PERMANENT_RETAIL = 3;
+  LOCATION_TYPE_PERMANENT_FOOD_SERVICE = 4;
+  LOCATION_TYPE_PERMANENT_CRAFT = 5;
+  LOCATION_TYPE_PERMANENT_WORKPLACE = 6;
+  LOCATION_TYPE_PERMANENT_EDUCATIONAL_INSTITUTION = 7;
+  LOCATION_TYPE_PERMANENT_PUBLIC_BUILDING = 8;
+
+  LOCATION_TYPE_TEMPORARY_CULTURAL_EVENT = 9;
+  LOCATION_TYPE_TEMPORARY_CLUB_ACTIVITY = 10;
+  LOCATION_TYPE_TEMPORARY_PRIVATE_EVENT = 11;
+  LOCATION_TYPE_TEMPORARY_WORSHIP_SERVICE = 12;
+
+}
\ No newline at end of file
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/pt/trace_warning.proto b/Server-Protocol-Buffer/src/main/proto/internal/pt/trace_warning.proto
new file mode 100644
index 0000000000000000000000000000000000000000..be4b1346d8d76e4276c6a3b11e51b537162dcd06
--- /dev/null
+++ b/Server-Protocol-Buffer/src/main/proto/internal/pt/trace_warning.proto
@@ -0,0 +1,22 @@
+// This file is auto-generated, DO NOT make any changes here
+syntax = "proto3";
+package de.rki.coronawarnapp.server.protocols.internal.pt;
+
+
+import "internal/pt/check_in.proto";
+
+message TraceWarningPackage {
+  // hours since UNIX Epoch
+  uint32 intervalNumber = 1;
+  string region = 2;
+  repeated TraceTimeIntervalWarning timeIntervalWarnings = 3;
+}
+
+message TraceTimeIntervalWarning {
+  string locationGuid = 1; // uuid
+  // 10-minute intervals since UNIX Epoch
+  uint32 startIntervalNumber = 2;
+  // 10-minute intervals since UNIX Epoch
+  uint32 endIntervalNumber = 3;
+  uint32 transmissionRiskLevel = 4;
+}
\ No newline at end of file
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/submission_payload.proto b/Server-Protocol-Buffer/src/main/proto/internal/submission_payload.proto
index 5c7ce61c8b935b7ba505cd6fe0f77b1b2430604a..c307356d2e3817732cf9efca8bd448a635b53cf7 100644
--- a/Server-Protocol-Buffer/src/main/proto/internal/submission_payload.proto
+++ b/Server-Protocol-Buffer/src/main/proto/internal/submission_payload.proto
@@ -3,7 +3,7 @@ syntax = "proto2";
 package de.rki.coronawarnapp.server.protocols.internal;
 
 import "external/exposurenotification/temporary_exposure_key_export.proto";
-import "internal/evreg/check_in.proto";
+import "internal/pt/check_in.proto";
 
 message SubmissionPayload {
   repeated de.rki.coronawarnapp.server.protocols.external.exposurenotification.TemporaryExposureKey keys = 1;
@@ -11,5 +11,5 @@ message SubmissionPayload {
   repeated string visitedCountries = 3;
   optional string origin = 4;
   optional bool consentToFederation = 5;
-  repeated de.rki.coronawarnapp.server.protocols.internal.evreg.CheckIn checkIns = 6;
+  repeated de.rki.coronawarnapp.server.protocols.internal.pt.CheckIn checkIns = 6;
 }
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_android.proto b/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_android.proto
index 3a1c608852dd20043a198f3c22213917e308cdd5..910b687cd7c2fed15000ccfdb511ac64923dff64 100644
--- a/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_android.proto
+++ b/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_android.proto
@@ -3,12 +3,12 @@ syntax = "proto3";
 package de.rki.coronawarnapp.server.protocols.internal.v2;
 
 import "internal/v2/app_features.proto";
-import "internal/v2/event_registration_parameters.proto";
 import "internal/v2/exposure_detection_parameters.proto";
 import "internal/v2/key_download_parameters.proto";
 import "internal/v2/ppdd_edus_parameters.proto";
 import "internal/v2/ppdd_els_parameters.proto";
 import "internal/v2/ppdd_ppa_parameters.proto";
+import "internal/v2/presence_tracing_parameters.proto";
 import "internal/v2/risk_calculation_parameters.proto";
 
 message ApplicationConfigurationAndroid {
@@ -34,7 +34,8 @@ message ApplicationConfigurationAndroid {
   PPDDPrivacyPreservingAnalyticsParametersAndroid privacyPreservingAnalyticsParameters = 11;
   PPDDErrorLogSharingParametersAndroid errorLogSharingParameters = 12;
 
-  EventRegistrationParameters eventRegistrationParameters = 13;
+  PresenceTracingParameters presenceTracingParameters = 13;
+
 }
 
 message DiagnosisKeysDataMapping {
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_ios.proto b/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_ios.proto
index e57b4a2ea15d0828a9014f35bfd820bbe74a281a..903269ff8952ae6f701f186a1745a8e40eb2a4ac 100644
--- a/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_ios.proto
+++ b/Server-Protocol-Buffer/src/main/proto/internal/v2/app_config_ios.proto
@@ -3,13 +3,13 @@ syntax = "proto3";
 package de.rki.coronawarnapp.server.protocols.internal.v2;
 
 import "internal/v2/app_features.proto";
-import "internal/v2/event_registration_parameters.proto";
 import "internal/v2/exposure_detection_parameters.proto";
 import "internal/v2/key_download_parameters.proto";
 import "internal/v2/ppdd_edus_parameters.proto";
 import "internal/v2/ppdd_els_parameters.proto";
 import "internal/v2/ppdd_ppa_parameters.proto";
 import "internal/v2/risk_calculation_parameters.proto";
+import "internal/v2/presence_tracing_parameters.proto";
 import "internal/v2/semantic_version.proto";
 
 message ApplicationConfigurationIOS {
@@ -33,7 +33,7 @@ message ApplicationConfigurationIOS {
   PPDDPrivacyPreservingAnalyticsParametersIOS privacyPreservingAnalyticsParameters = 10;
   PPDDErrorLogSharingParametersIOS errorLogSharingParameters = 11;
 
-  EventRegistrationParameters eventRegistrationParameters = 12;
+  PresenceTracingParameters presenceTracingParameters = 12;
 }
 
 message ExposureConfiguration {
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/v2/key_download_parameters.proto b/Server-Protocol-Buffer/src/main/proto/internal/v2/key_download_parameters.proto
index 88249e647ddf6a837b5b52a5dd14e20f867f446a..88bc4604b013ddb9c3d15b8c6484d079dea78697 100644
--- a/Server-Protocol-Buffer/src/main/proto/internal/v2/key_download_parameters.proto
+++ b/Server-Protocol-Buffer/src/main/proto/internal/v2/key_download_parameters.proto
@@ -7,6 +7,7 @@ message KeyDownloadParametersIOS {
 
   repeated DayPackageMetadata revokedDayPackages = 1;
   repeated HourPackageMetadata revokedHourPackages = 2;
+  repeated TraceWarningPackageMetadata revokedTraceWarningPackages = 3;
 }
 
 message KeyDownloadParametersAndroid {
@@ -17,6 +18,8 @@ message KeyDownloadParametersAndroid {
   int32 downloadTimeoutInSeconds = 3;
 
   int32 overallTimeoutInSeconds = 4;
+
+  repeated TraceWarningPackageMetadata revokedTraceWarningPackages = 5;
 }
 
 message DayPackageMetadata {
@@ -30,4 +33,8 @@ message HourPackageMetadata {
   string date = 2;
   int32 hour = 3;
   string etag = 4;
+}
+
+message TraceWarningPackageMetadata {
+  string etag = 1;
 }
\ No newline at end of file
diff --git a/Server-Protocol-Buffer/src/main/proto/internal/v2/presence_tracing_parameters.proto b/Server-Protocol-Buffer/src/main/proto/internal/v2/presence_tracing_parameters.proto
new file mode 100644
index 0000000000000000000000000000000000000000..162a01f27879c7d6f5c6d5576a0a473a0f176363
--- /dev/null
+++ b/Server-Protocol-Buffer/src/main/proto/internal/v2/presence_tracing_parameters.proto
@@ -0,0 +1,48 @@
+// This file is auto-generated, DO NOT make any changes here
+syntax = "proto3";
+package de.rki.coronawarnapp.server.protocols.internal.v2;
+
+import "internal/v2/risk_calculation_parameters.proto";
+
+message PresenceTracingParameters {
+
+  PresenceTracingRiskCalculationParameters riskCalculationParameters = 1;
+
+  PresenceTracingSubmissionParameters submissionParameters = 2;
+
+  QRCodeErrorCorrectionLevel qrCodeErrorCorrectionLevel = 3;
+
+  repeated uint32 revokedTraceLocationVersions = 4;
+
+  enum QRCodeErrorCorrectionLevel {
+    MEDIUM = 0;
+    LOW = 1;
+    QUANTILE = 2;
+    HIGH = 3;
+  }
+}
+message PresenceTracingRiskCalculationParameters {
+
+  repeated TransmissionRiskValueMapping transmissionRiskValueMapping = 1;
+
+  repeated NormalizedTimeToRiskLevelMapping normalizedTimePerCheckInToRiskLevelMapping = 2;
+
+  repeated NormalizedTimeToRiskLevelMapping normalizedTimePerDayToRiskLevelMapping = 3;
+}
+
+message PresenceTracingSubmissionParameters {
+
+  repeated DurationFilter durationFilters = 1;
+
+  repeated AerosoleDecayFunctionLinear aerosoleDecayLinearFunctions = 2;
+
+  message DurationFilter {
+    Range dropIfMinutesInRange = 1;
+  }
+
+  message AerosoleDecayFunctionLinear {
+    Range minutesRange = 1;
+    double slope = 2;
+    double intercept = 3;
+  }
+}
\ No newline at end of file