diff --git a/.eslintrc.json b/.eslintrc.json
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,7 +1,8 @@
 {
   "root": true,
   "env": {
-    "es6": true
+    "es6": true,
+    "es2020": true
   },
   "extends": [
     "eslint:recommended",
diff --git a/keyserver/src/responders/responder-validators.test.js b/keyserver/src/responders/responder-validators.test.js
--- a/keyserver/src/responders/responder-validators.test.js
+++ b/keyserver/src/responders/responder-validators.test.js
@@ -96,7 +96,6 @@
                 role: '83796',
                 permissions: {
                   know_of: { value: true, source: '1' },
-                  membership: { value: false, source: null },
                   visible: { value: true, source: '1' },
                   voiced: { value: true, source: '1' },
                   edit_entries: { value: true, source: '1' },
@@ -136,7 +135,6 @@
               role: '83795',
               permissions: {
                 know_of: { value: true, source: '1' },
-                membership: { value: false, source: null },
                 visible: { value: true, source: '1' },
                 voiced: { value: false, source: null },
                 edit_entries: { value: false, source: null },
@@ -227,7 +225,6 @@
                 role: '83796',
                 permissions: {
                   know_of: { value: true, source: '1' },
-                  membership: { value: false, source: null },
                   visible: { value: true, source: '1' },
                   voiced: { value: true, source: '1' },
                   edit_entries: { value: true, source: '1' },
@@ -253,7 +250,6 @@
                 role: '83795',
                 permissions: {
                   know_of: { value: true, source: '1' },
-                  membership: { value: false, source: null },
                   visible: { value: true, source: '1' },
                   voiced: { value: false, source: null },
                   edit_entries: { value: false, source: null },
@@ -331,7 +327,6 @@
               role: '83795',
               permissions: {
                 know_of: { value: true, source: '1' },
-                membership: { value: false, source: null },
                 visible: { value: true, source: '1' },
                 voiced: { value: false, source: null },
                 edit_entries: { value: false, source: null },
diff --git a/lib/permissions/minimally-encoded-thread-permissions.js b/lib/permissions/minimally-encoded-thread-permissions.js
new file mode 100644
--- /dev/null
+++ b/lib/permissions/minimally-encoded-thread-permissions.js
@@ -0,0 +1,78 @@
+// @flow
+
+import invariant from 'invariant';
+
+import type {
+  ThreadPermission,
+  ThreadPermissionsInfo,
+} from '../types/thread-permission-types.js';
+import { entries } from '../utils/objects.js';
+
+const minimallyEncodedThreadPermissions = Object.freeze({
+  // TODO (atul): Update flow to `194.0.0` for bigint support
+  // $FlowIssue bigint-unsupported
+  know_of: BigInt(1) << BigInt(0),
+  visible: BigInt(1) << BigInt(1),
+  voiced: BigInt(1) << BigInt(2),
+  edit_entries: BigInt(1) << BigInt(3),
+  edit_thread: BigInt(1) << BigInt(4), // EDIT_THREAD_NAME
+  edit_thread_description: BigInt(1) << BigInt(5),
+  edit_thread_color: BigInt(1) << BigInt(6),
+  delete_thread: BigInt(1) << BigInt(7),
+  create_subthreads: BigInt(1) << BigInt(8), // CREATE_SUBCHANNELS
+  create_sidebars: BigInt(1) << BigInt(9),
+  join_thread: BigInt(1) << BigInt(10),
+  edit_permissions: BigInt(1) << BigInt(11),
+  add_members: BigInt(1) << BigInt(12),
+  remove_members: BigInt(1) << BigInt(13),
+  change_role: BigInt(1) << BigInt(14),
+  leave_thread: BigInt(1) << BigInt(15),
+  react_to_message: BigInt(1) << BigInt(16),
+  edit_message: BigInt(1) << BigInt(17),
+  edit_thread_avatar: BigInt(1) << BigInt(18),
+  manage_pins: BigInt(1) << BigInt(19),
+  manage_invite_links: BigInt(1) << BigInt(20),
+});
+
+// TODO (atul): Update flow to `194.0.0` for bigint support
+// $FlowIssue bigint-unsupported
+const permissionsToBitmask = (permissions: ThreadPermissionsInfo): bigint => {
+  let bitmask = BigInt(0);
+  for (const [key, permission] of entries(permissions)) {
+    if (permission.value && key in minimallyEncodedThreadPermissions) {
+      invariant(
+        // TODO (atul): Update flow to `194.0.0` for bigint support
+        // $FlowIssue illegal-typeof
+        typeof minimallyEncodedThreadPermissions[key] === 'bigint',
+        'must be bigint',
+      );
+      bitmask |= minimallyEncodedThreadPermissions[key];
+    }
+  }
+  return bitmask;
+};
+
+const hasPermission = (
+  // TODO (atul): Update flow to `194.0.0` for bigint support
+  // $FlowIssue bigint-unsupported
+  permissionsBitmask: bigint,
+  permission: ThreadPermission,
+): boolean => {
+  if (!(permission in minimallyEncodedThreadPermissions)) {
+    return false;
+  }
+  const permissionBitmask = minimallyEncodedThreadPermissions[permission];
+  invariant(
+    // TODO (atul): Update flow to `194.0.0` for bigint support
+    // $FlowIssue illegal-typeof
+    typeof permissionBitmask === 'bigint',
+    'permissionBitmask must be of type bigint',
+  );
+  return (permissionsBitmask & permissionBitmask) !== BigInt(0);
+};
+
+export {
+  minimallyEncodedThreadPermissions,
+  permissionsToBitmask,
+  hasPermission,
+};
diff --git a/lib/permissions/minimally-encoded-thread-permissions.test.js b/lib/permissions/minimally-encoded-thread-permissions.test.js
new file mode 100644
--- /dev/null
+++ b/lib/permissions/minimally-encoded-thread-permissions.test.js
@@ -0,0 +1,53 @@
+// @flow
+
+import {
+  hasPermission,
+  permissionsToBitmask,
+} from './minimally-encoded-thread-permissions.js';
+
+describe('minimallyEncodedThreadPermissions', () => {
+  const permissions = {
+    know_of: { value: true, source: '1' },
+    visible: { value: true, source: '1' },
+    voiced: { value: true, source: '1' },
+    edit_entries: { value: true, source: '1' },
+    edit_thread: { value: true, source: '1' },
+    edit_thread_description: { value: true, source: '1' },
+    edit_thread_color: { value: true, source: '1' },
+    delete_thread: { value: true, source: '1' },
+    create_subthreads: { value: true, source: '1' },
+    create_sidebars: { value: true, source: '1' },
+    join_thread: { value: false, source: null },
+    edit_permissions: { value: false, source: null },
+    add_members: { value: true, source: '1' },
+    remove_members: { value: true, source: '1' },
+    change_role: { value: true, source: '1' },
+    leave_thread: { value: false, source: null },
+    react_to_message: { value: true, source: '1' },
+    edit_message: { value: true, source: '1' },
+  };
+
+  it('should encode ThreadPermissionsInfo as bitmask', () => {
+    const permissionsBitmask = permissionsToBitmask(permissions);
+    expect(permissionsBitmask.toString(2)).toBe('110111001111111111');
+    expect(hasPermission(permissionsBitmask, 'know_of')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'visible')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'voiced')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'edit_entries')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'edit_thread')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'edit_thread_description')).toBe(
+      true,
+    );
+    expect(hasPermission(permissionsBitmask, 'edit_thread_color')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'delete_thread')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'create_subthreads')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'create_sidebars')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'join_thread')).toBe(false);
+    expect(hasPermission(permissionsBitmask, 'edit_permissions')).toBe(false);
+    expect(hasPermission(permissionsBitmask, 'remove_members')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'change_role')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'leave_thread')).toBe(false);
+    expect(hasPermission(permissionsBitmask, 'react_to_message')).toBe(true);
+    expect(hasPermission(permissionsBitmask, 'edit_message')).toBe(true);
+  });
+});
diff --git a/lib/types/thread-permission-types.js b/lib/types/thread-permission-types.js
--- a/lib/types/thread-permission-types.js
+++ b/lib/types/thread-permission-types.js
@@ -12,7 +12,6 @@
 // across all roles, it should be added to `universalCommunityPermissions`.
 export const threadPermissions = Object.freeze({
   KNOW_OF: 'know_of',
-  MEMBERSHIP_DEPRECATED: 'membership',
   VISIBLE: 'visible',
   VOICED: 'voiced',
   EDIT_ENTRIES: 'edit_entries',
@@ -41,7 +40,6 @@
 ): ThreadPermission {
   invariant(
     ourThreadPermissions === 'know_of' ||
-      ourThreadPermissions === 'membership' ||
       ourThreadPermissions === 'visible' ||
       ourThreadPermissions === 'voiced' ||
       ourThreadPermissions === 'edit_entries' ||
diff --git a/lib/types/validation.test.js b/lib/types/validation.test.js
--- a/lib/types/validation.test.js
+++ b/lib/types/validation.test.js
@@ -363,10 +363,6 @@
           value: true,
           source: '1',
         },
-        membership: {
-          value: false,
-          source: null,
-        },
         visible: {
           value: true,
           source: '1',
@@ -450,10 +446,6 @@
           value: true,
           source: '85171',
         },
-        membership: {
-          value: false,
-          source: null,
-        },
         visible: {
           value: true,
           source: '85171',
@@ -559,10 +551,6 @@
         value: true,
         source: '85171',
       },
-      membership: {
-        value: false,
-        source: null,
-      },
       visible: {
         value: true,
         source: '85171',
diff --git a/lib/utils/thread-ops-utils.test.js b/lib/utils/thread-ops-utils.test.js
--- a/lib/utils/thread-ops-utils.test.js
+++ b/lib/utils/thread-ops-utils.test.js
@@ -26,10 +26,6 @@
           value: true,
           source: '1',
         },
-        membership: {
-          value: false,
-          source: null,
-        },
         visible: {
           value: true,
           source: '1',
@@ -109,10 +105,6 @@
           value: true,
           source: '84015',
         },
-        membership: {
-          value: false,
-          source: null,
-        },
         visible: {
           value: true,
           source: '84015',
@@ -192,10 +184,6 @@
           value: true,
           source: '84015',
         },
-        membership: {
-          value: false,
-          source: null,
-        },
         visible: {
           value: true,
           source: '84015',
@@ -297,10 +285,6 @@
         value: true,
         source: '84015',
       },
-      membership: {
-        value: false,
-        source: null,
-      },
       visible: {
         value: true,
         source: '84015',
@@ -391,11 +375,11 @@
   creationTime: '1679595843051',
   parentThreadID: '1',
   members:
-    '[{"id":"256","role":null,"permissions":{"know_of":{"value":true,"source":"1"},"membership":{"value":false,"source":null},"visible":{"value":true,"source":"1"},"voiced":{"value":true,"source":"1"},"edit_entries":{"value":true,"source":"1"},"edit_thread":{"value":true,"source":"1"},"edit_thread_description":{"value":true,"source":"1"},"edit_thread_color":{"value":true,"source":"1"},"delete_thread":{"value":true,"source":"1"},"create_subthreads":{"value":true,"source":"1"},"create_sidebars":{"value":true,"source":"1"},"join_thread":{"value":true,"source":"1"},"edit_permissions":{"value":true,"source":"1"},"add_members":{"value":true,"source":"1"},"remove_members":{"value":true,"source":"1"},"change_role":{"value":true,"source":"1"},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":false,"source":null},"edit_message":{"value":false,"source":null}},"isSender":false},{"id":"83809","role":"84016","permissions":{"know_of":{"value":true,"source":"84015"},"membership":{"value":false,"source":null},"visible":{"value":true,"source":"84015"},"voiced":{"value":true,"source":"84015"},"edit_entries":{"value":true,"source":"84015"},"edit_thread":{"value":true,"source":"84015"},"edit_thread_description":{"value":true,"source":"84015"},"edit_thread_color":{"value":true,"source":"84015"},"delete_thread":{"value":false,"source":null},"create_subthreads":{"value":false,"source":null},"create_sidebars":{"value":true,"source":"84015"},"join_thread":{"value":false,"source":null},"edit_permissions":{"value":false,"source":null},"add_members":{"value":false,"source":null},"remove_members":{"value":false,"source":null},"change_role":{"value":false,"source":null},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":true,"source":"84015"},"edit_message":{"value":true,"source":"84015"}},"isSender":true},{"id":"83969","role":"84016","permissions":{"know_of":{"value":true,"source":"84015"},"membership":{"value":false,"source":null},"visible":{"value":true,"source":"84015"},"voiced":{"value":true,"source":"84015"},"edit_entries":{"value":true,"source":"84015"},"edit_thread":{"value":true,"source":"84015"},"edit_thread_description":{"value":true,"source":"84015"},"edit_thread_color":{"value":true,"source":"84015"},"delete_thread":{"value":false,"source":null},"create_subthreads":{"value":false,"source":null},"create_sidebars":{"value":true,"source":"84015"},"join_thread":{"value":false,"source":null},"edit_permissions":{"value":false,"source":null},"add_members":{"value":false,"source":null},"remove_members":{"value":false,"source":null},"change_role":{"value":false,"source":null},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":true,"source":"84015"},"edit_message":{"value":true,"source":"84015"}},"isSender":true}]',
+    '[{"id":"256","role":null,"permissions":{"know_of":{"value":true,"source":"1"},"visible":{"value":true,"source":"1"},"voiced":{"value":true,"source":"1"},"edit_entries":{"value":true,"source":"1"},"edit_thread":{"value":true,"source":"1"},"edit_thread_description":{"value":true,"source":"1"},"edit_thread_color":{"value":true,"source":"1"},"delete_thread":{"value":true,"source":"1"},"create_subthreads":{"value":true,"source":"1"},"create_sidebars":{"value":true,"source":"1"},"join_thread":{"value":true,"source":"1"},"edit_permissions":{"value":true,"source":"1"},"add_members":{"value":true,"source":"1"},"remove_members":{"value":true,"source":"1"},"change_role":{"value":true,"source":"1"},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":false,"source":null},"edit_message":{"value":false,"source":null}},"isSender":false},{"id":"83809","role":"84016","permissions":{"know_of":{"value":true,"source":"84015"},"visible":{"value":true,"source":"84015"},"voiced":{"value":true,"source":"84015"},"edit_entries":{"value":true,"source":"84015"},"edit_thread":{"value":true,"source":"84015"},"edit_thread_description":{"value":true,"source":"84015"},"edit_thread_color":{"value":true,"source":"84015"},"delete_thread":{"value":false,"source":null},"create_subthreads":{"value":false,"source":null},"create_sidebars":{"value":true,"source":"84015"},"join_thread":{"value":false,"source":null},"edit_permissions":{"value":false,"source":null},"add_members":{"value":false,"source":null},"remove_members":{"value":false,"source":null},"change_role":{"value":false,"source":null},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":true,"source":"84015"},"edit_message":{"value":true,"source":"84015"}},"isSender":true},{"id":"83969","role":"84016","permissions":{"know_of":{"value":true,"source":"84015"},"visible":{"value":true,"source":"84015"},"voiced":{"value":true,"source":"84015"},"edit_entries":{"value":true,"source":"84015"},"edit_thread":{"value":true,"source":"84015"},"edit_thread_description":{"value":true,"source":"84015"},"edit_thread_color":{"value":true,"source":"84015"},"delete_thread":{"value":false,"source":null},"create_subthreads":{"value":false,"source":null},"create_sidebars":{"value":true,"source":"84015"},"join_thread":{"value":false,"source":null},"edit_permissions":{"value":false,"source":null},"add_members":{"value":false,"source":null},"remove_members":{"value":false,"source":null},"change_role":{"value":false,"source":null},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":true,"source":"84015"},"edit_message":{"value":true,"source":"84015"}},"isSender":true}]',
   roles:
     '{"84016":{"id":"84016","name":"Members","permissions":{"know_of":true,"visible":true,"voiced":true,"react_to_message":true,"edit_message":true,"edit_entries":true,"edit_thread":true,"edit_thread_color":true,"edit_thread_description":true,"create_sidebars":true,"descendant_open_know_of":true,"descendant_open_visible":true,"child_open_join_thread":true},"isDefault":true}}',
   currentUser:
-    '{"role":"84016","permissions":{"know_of":{"value":true,"source":"84015"},"membership":{"value":false,"source":null},"visible":{"value":true,"source":"84015"},"voiced":{"value":true,"source":"84015"},"edit_entries":{"value":true,"source":"84015"},"edit_thread":{"value":true,"source":"84015"},"edit_thread_description":{"value":true,"source":"84015"},"edit_thread_color":{"value":true,"source":"84015"},"delete_thread":{"value":false,"source":null},"create_subthreads":{"value":false,"source":null},"create_sidebars":{"value":true,"source":"84015"},"join_thread":{"value":false,"source":null},"edit_permissions":{"value":false,"source":null},"add_members":{"value":false,"source":null},"remove_members":{"value":false,"source":null},"change_role":{"value":false,"source":null},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":true,"source":"84015"},"edit_message":{"value":true,"source":"84015"}},"subscription":{"home":true,"pushNotifs":true},"unread":false}',
+    '{"role":"84016","permissions":{"know_of":{"value":true,"source":"84015"},"visible":{"value":true,"source":"84015"},"voiced":{"value":true,"source":"84015"},"edit_entries":{"value":true,"source":"84015"},"edit_thread":{"value":true,"source":"84015"},"edit_thread_description":{"value":true,"source":"84015"},"edit_thread_color":{"value":true,"source":"84015"},"delete_thread":{"value":false,"source":null},"create_subthreads":{"value":false,"source":null},"create_sidebars":{"value":true,"source":"84015"},"join_thread":{"value":false,"source":null},"edit_permissions":{"value":false,"source":null},"add_members":{"value":false,"source":null},"remove_members":{"value":false,"source":null},"change_role":{"value":false,"source":null},"leave_thread":{"value":false,"source":null},"react_to_message":{"value":true,"source":"84015"},"edit_message":{"value":true,"source":"84015"}},"subscription":{"home":true,"pushNotifs":true},"unread":false}',
   repliesCount: 0,
   containingThreadID: '1',
   community: '1',
diff --git a/native/redux/update-roles-and-permissions-test-data.js b/native/redux/update-roles-and-permissions-test-data.js
--- a/native/redux/update-roles-and-permissions-test-data.js
+++ b/native/redux/update-roles-and-permissions-test-data.js
@@ -74,10 +74,6 @@
           source: null,
           value: false,
         },
-        membership: {
-          source: null,
-          value: false,
-        },
         react_to_message: {
           source: null,
           value: false,
@@ -174,10 +170,6 @@
             source: '1',
             value: true,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '1',
             value: true,
@@ -265,10 +257,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: null,
             value: false,
@@ -422,10 +410,6 @@
           source: null,
           value: false,
         },
-        membership: {
-          source: null,
-          value: false,
-        },
         react_to_message: {
           source: '84596',
           value: true,
@@ -522,10 +506,6 @@
             source: '1',
             value: true,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: null,
             value: false,
@@ -613,10 +593,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84596',
             value: true,
@@ -735,10 +711,6 @@
           source: null,
           value: false,
         },
-        membership: {
-          source: null,
-          value: false,
-        },
         react_to_message: {
           source: '84598',
           value: true,
@@ -834,10 +806,6 @@
             source: '1',
             value: true,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84598',
             value: true,
@@ -925,10 +893,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84598',
             value: true,
@@ -1048,10 +1012,6 @@
           source: null,
           value: false,
         },
-        membership: {
-          source: null,
-          value: false,
-        },
         react_to_message: {
           source: '84627',
           value: true,
@@ -1147,10 +1107,6 @@
             source: '1',
             value: true,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: null,
             value: false,
@@ -1238,10 +1194,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84627',
             value: true,
@@ -1329,10 +1281,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84627',
             value: true,
@@ -1452,10 +1400,6 @@
           source: null,
           value: false,
         },
-        membership: {
-          source: null,
-          value: false,
-        },
         react_to_message: {
           source: '84656',
           value: true,
@@ -1551,10 +1495,6 @@
             source: '1',
             value: true,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: null,
             value: false,
@@ -1642,10 +1582,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84656',
             value: true,
@@ -1733,10 +1669,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84656',
             value: true,
@@ -1824,10 +1756,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: '84656',
             value: true,
@@ -1954,10 +1882,6 @@
           source: null,
           value: false,
         },
-        membership: {
-          source: null,
-          value: false,
-        },
         react_to_message: {
           source: '86071',
           value: true,
@@ -2053,10 +1977,6 @@
             source: '1',
             value: true,
           },
-          membership: {
-            source: null,
-            value: false,
-          },
           react_to_message: {
             source: null,
             value: false,
@@ -2144,10 +2064,6 @@
             source: null,
             value: false,
           },
-          membership: {
-            source: null,
-            value: false,
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