diff --git a/dist/bundle.es.js b/dist/bundle.es.js
index 3f58baa..8d472d8 100644
--- a/dist/bundle.es.js
+++ b/dist/bundle.es.js
@@ -135,6 +135,15 @@ const COMMENT_LIST_FAILED = 'COMMENT_LIST_FAILED';
 const COMMENT_CREATE_STARTED = 'COMMENT_CREATE_STARTED';
 const COMMENT_CREATE_COMPLETED = 'COMMENT_CREATE_COMPLETED';
 const COMMENT_CREATE_FAILED = 'COMMENT_CREATE_FAILED';
+const COMMENT_ABANDON_STARTED = 'COMMENT_ABANDON_STARTED';
+const COMMENT_ABANDON_COMPLETED = 'COMMENT_ABANDON_COMPLETED';
+const COMMENT_ABANDON_FAILED = 'COMMENT_ABANDON_FAILED';
+const COMMENT_UPDATE_STARTED = 'COMMENT_UPDATE_STARTED';
+const COMMENT_UPDATE_COMPLETED = 'COMMENT_UPDATE_COMPLETED';
+const COMMENT_UPDATE_FAILED = 'COMMENT_UPDATE_FAILED';
+const COMMENT_HIDE_STARTED = 'COMMENT_HIDE_STARTED';
+const COMMENT_HIDE_COMPLETED = 'COMMENT_HIDE_COMPLETED';
+const COMMENT_HIDE_FAILED = 'COMMENT_HIDE_FAILED';
 
 // Files
 const FILE_LIST_STARTED = 'FILE_LIST_STARTED';
@@ -382,6 +391,15 @@ var action_types = /*#__PURE__*/Object.freeze({
   COMMENT_CREATE_STARTED: COMMENT_CREATE_STARTED,
   COMMENT_CREATE_COMPLETED: COMMENT_CREATE_COMPLETED,
   COMMENT_CREATE_FAILED: COMMENT_CREATE_FAILED,
+  COMMENT_ABANDON_STARTED: COMMENT_ABANDON_STARTED,
+  COMMENT_ABANDON_COMPLETED: COMMENT_ABANDON_COMPLETED,
+  COMMENT_ABANDON_FAILED: COMMENT_ABANDON_FAILED,
+  COMMENT_UPDATE_STARTED: COMMENT_UPDATE_STARTED,
+  COMMENT_UPDATE_COMPLETED: COMMENT_UPDATE_COMPLETED,
+  COMMENT_UPDATE_FAILED: COMMENT_UPDATE_FAILED,
+  COMMENT_HIDE_STARTED: COMMENT_HIDE_STARTED,
+  COMMENT_HIDE_COMPLETED: COMMENT_HIDE_COMPLETED,
+  COMMENT_HIDE_FAILED: COMMENT_HIDE_FAILED,
   FILE_LIST_STARTED: FILE_LIST_STARTED,
   FILE_LIST_SUCCEEDED: FILE_LIST_SUCCEEDED,
   FETCH_FILE_INFO_STARTED: FETCH_FILE_INFO_STARTED,
@@ -782,12 +800,12 @@ var daemon_settings = /*#__PURE__*/Object.freeze({
 });
 
 /*
-* How to use this file:
-* Settings exported from here will trigger the setting to be
-* sent to the preference middleware when set using the
-* usual setDaemonSettings and clearDaemonSettings methods.
-*
-* See redux/settings/actions in the app for where this is used.
+ * How to use this file:
+ * Settings exported from here will trigger the setting to be
+ * sent to the preference middleware when set using the
+ * usual setDaemonSettings and clearDaemonSettings methods.
+ *
+ * See redux/settings/actions in the app for where this is used.
  */
 
 const WALLET_SERVERS = LBRYUM_SERVERS;
@@ -934,6 +952,11 @@ const Lbry = {
   // Comments
   comment_list: (params = {}) => daemonCallWithResult('comment_list', params),
   comment_create: (params = {}) => daemonCallWithResult('comment_create', params),
+  comment_hide: (params = {}) => daemonCallWithResult('comment_hide', params),
+  comment_abandon: (params = {}) => daemonCallWithResult('comment_abandon', params),
+  // requires SDK ver. 0.53.0
+  comment_update: (params = {}) => daemonCallWithResult('comment_update', params),
+
   // Connect to the sdk
   connect: () => {
     if (Lbry.connectPromise === null) {
@@ -1241,6 +1264,18 @@ function buildURI(UrlObj, includeProto = true, protoDefault = 'lbry://') {
         deprecatedParts = _objectWithoutProperties(UrlObj, ['streamName', 'streamClaimId', 'channelName', 'channelClaimId', 'primaryClaimSequence', 'primaryBidPosition', 'secondaryClaimSequence', 'secondaryBidPosition']);
   const { claimId, claimName, contentName } = deprecatedParts;
 
+  {
+    if (claimId) {
+      console.error(__("'claimId' should no longer be used. Use 'streamClaimId' or 'channelClaimId' instead"));
+    }
+    if (claimName) {
+      console.error(__("'claimName' should no longer be used. Use 'streamClaimName' or 'channelClaimName' instead"));
+    }
+    if (contentName) {
+      console.error(__("'contentName' should no longer be used. Use 'streamName' instead"));
+    }
+  }
+
   if (!claimName && !channelName && !streamName) {
     console.error(__("'claimName', 'channelName', and 'streamName' are all empty. One must be present to build a url."));
   }
@@ -1565,7 +1600,10 @@ function extractUserState(rawObj) {
 function doPopulateSharedUserState(sharedSettings) {
   return dispatch => {
     const { subscriptions, tags, blocked, settings } = extractUserState(sharedSettings);
-    dispatch({ type: USER_STATE_POPULATE, data: { subscriptions, tags, blocked, settings } });
+    dispatch({
+      type: USER_STATE_POPULATE,
+      data: { subscriptions, tags, blocked, settings }
+    });
   };
 }
 
@@ -4146,6 +4184,8 @@ const doUpdateSearchOptions = newOptions => (dispatch, getState) => {
   }
 };
 
+//      
+
 function savePosition(claimId, outpoint, position) {
   return dispatch => {
     dispatch({
@@ -4223,9 +4263,10 @@ function doCommentCreate(comment = '', claim_id = '', channel, parent_id) {
     const namedChannelClaim = myChannels && myChannels.find(myChannel => myChannel.name === channel);
     const channel_id = namedChannelClaim ? namedChannelClaim.claim_id : null;
     return lbryProxy.comment_create({
-      comment,
-      claim_id,
-      channel_id
+      comment: comment,
+      claim_id: claim_id,
+      channel_id: channel_id,
+      parent_id: parent_id
     }).then(result => {
       dispatch({
         type: COMMENT_CREATE_COMPLETED,
@@ -4247,6 +4288,96 @@ function doCommentCreate(comment = '', claim_id = '', channel, parent_id) {
   };
 }
 
+function doCommentHide(comment_id) {
+  return dispatch => {
+    dispatch({
+      type: COMMENT_HIDE_STARTED
+    });
+    return lbryProxy.comment_hide({
+      comment_ids: [comment_id]
+    }).then(result => {
+      dispatch({
+        type: COMMENT_HIDE_COMPLETED,
+        data: result
+      });
+    }).catch(error => {
+      dispatch({
+        type: COMMENT_HIDE_FAILED,
+        data: error
+      });
+      dispatch(doToast({
+        message: 'There was an error hiding this comment. Please try again later.',
+        isError: true
+      }));
+    });
+  };
+}
+
+function doCommentAbandon(comment_id) {
+  return dispatch => {
+    dispatch({
+      type: COMMENT_ABANDON_STARTED
+    });
+    return lbryProxy.comment_abandon({
+      comment_id: comment_id
+    }).then(result => {
+      // Comment may not be deleted if the signing channel can't be signed.
+      // This will happen if the channel was recently created or abandoned.
+      if (result.abandoned) {
+        dispatch({
+          type: COMMENT_ABANDON_COMPLETED,
+          data: {
+            comment_id: comment_id
+          }
+        });
+      } else {
+        dispatch({
+          type: COMMENT_ABANDON_FAILED
+        });
+      }
+    }).catch(error => {
+      dispatch({
+        type: COMMENT_ABANDON_FAILED,
+        data: error
+      });
+      dispatch(doToast({
+        message: 'There was an error hiding this comment. Please try again later.',
+        isError: true
+      }));
+    });
+  };
+}
+
+function doCommentUpdate(comment_id, comment) {
+  // if they provided an empty string, they must have wanted to abandon
+  if (comment === '') {
+    return doCommentAbandon(comment_id);
+  } else {
+    return dispatch => {
+      dispatch({
+        type: COMMENT_UPDATE_STARTED
+      });
+      return lbryProxy.comment_update({
+        comment_id: comment_id,
+        comment: comment
+      }).then(result => {
+        dispatch({
+          type: COMMENT_UPDATE_COMPLETED,
+          data: {
+            comment: result
+          }
+        });
+      }).catch(error => {
+        dispatch({ type: COMMENT_UPDATE_FAILED, data: error });
+        dispatch(doToast({
+          message: 'There was an error hiding this comment. Please try again later.',
+          isError: true
+        }));
+      });
+    };
+  }
+}
+
 //      
 
 const doToggleBlockChannel = uri => ({
@@ -4663,9 +4794,11 @@ const handleActions = (actionMap, defaultState) => (state = defaultState, action
 var _extends$8 = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
 
 const defaultState$1 = {
-  byId: {},
-  commentsByUri: {},
-  isLoading: false
+  commentById: {}, // commentId -> Comment
+  byId: {}, // ClaimID -> list of comments
+  commentsByUri: {}, // URI -> claimId
+  isLoading: false,
+  myComments: undefined
 };
 
 const commentReducer = handleActions({
@@ -4679,15 +4812,22 @@ const commentReducer = handleActions({
 
   [COMMENT_CREATE_COMPLETED]: (state, action) => {
     const { comment, claimId } = action.data;
+    const commentById = Object.assign({}, state.commentById);
     const byId = Object.assign({}, state.byId);
     const comments = byId[claimId];
-    const newComments = comments.slice();
+    const newCommentIds = comments.slice();
 
-    newComments.unshift(comment);
-    byId[claimId] = newComments;
+    // add the comment by its ID
+    commentById[comment.comment_id] = comment;
+
+    // push the comment_id to the top of ID list
+    newCommentIds.unshift(comment.comment_id);
+    byId[claimId] = newCommentIds;
 
     return _extends$8({}, state, {
-      byId
+      commentById,
+      byId,
+      isLoading: false
     });
   },
 
@@ -4695,15 +4835,29 @@ const commentReducer = handleActions({
 
   [COMMENT_LIST_COMPLETED]: (state, action) => {
     const { comments, claimId, uri } = action.data;
+
+    const commentById = Object.assign({}, state.commentById);
     const byId = Object.assign({}, state.byId);
     const commentsByUri = Object.assign({}, state.commentsByUri);
 
     if (comments) {
-      byId[claimId] = comments;
+      // we use an Array to preserve order of listing
+      // in reality this doesn't matter and we can just
+      // sort comments by their timestamp
+      const commentIds = Array(comments.length);
+
+      // map the comment_ids to the new comments
+      for (let i = 0; i < comments.length; i++) {
+        commentIds[i] = comments[i].comment_id;
+        commentById[commentIds[i]] = comments[i];
+      }
+
+      byId[claimId] = commentIds;
       commentsByUri[uri] = claimId;
     }
     return _extends$8({}, state, {
       byId,
+      commentById,
       commentsByUri,
       isLoading: false
     });
@@ -4711,6 +4865,67 @@ const commentReducer = handleActions({
 
   [COMMENT_LIST_FAILED]: (state, action) => _extends$8({}, state, {
     isLoading: false
+  }),
+  [COMMENT_ABANDON_STARTED]: (state, action) => _extends$8({}, state, {
+    isLoading: true
+  }),
+  [COMMENT_ABANDON_COMPLETED]: (state, action) => {
+    const { comment_id } = action.data;
+    const commentById = Object.assign({}, state.commentById);
+    const byId = Object.assign({}, state.byId);
+
+    // to remove the comment and its references
+    const claimId = commentById[comment_id].claim_id;
+    for (let i = 0; i < byId[claimId].length; i++) {
+      if (byId[claimId][i] === comment_id) {
+        byId[claimId].splice(i, 1);
+        break;
+      }
+    }
+    delete commentById[comment_id];
+
+    return _extends$8({}, state, {
+      commentById,
+      byId,
+      isLoading: false
+    });
+  },
+  // do nothing
+  [COMMENT_ABANDON_FAILED]: (state, action) => _extends$8({}, state, {
+    isLoading: false
+  }),
+  // do nothing
+  [COMMENT_UPDATE_STARTED]: (state, action) => _extends$8({}, state, {
+    isLoading: true
+  }),
+  // replace existing comment with comment returned here under its comment_id
+  [COMMENT_UPDATE_COMPLETED]: (state, action) => {
+    const { comment } = action.data;
+    const commentById = Object.assign({}, state.commentById);
+
+    if (comment) {
+      commentById[comment.comment_id] = comment;
+    }
+
+    return _extends$8({}, state, {
+      commentById,
+      isLoading: false
+    });
+  },
+  // nothing can be done here
+  [COMMENT_UPDATE_FAILED]: (state, action) => _extends$8({}, state, {
+    isLoading: false
+  }),
+  // nothing can really be done here
+  [COMMENT_HIDE_STARTED]: (state, action) => _extends$8({}, state, {
+    isLoading: true
+  }),
+  [COMMENT_HIDE_COMPLETED]: (state, action) => _extends$8({}, state, { // todo: add HiddenComments state & create selectors
+    isLoading: false
+  }),
+  // nothing can be done here
+  [COMMENT_HIDE_FAILED]: (state, action) => _extends$8({}, state, {
+    isLoading: false
   })
 }, defaultState$1);
 
@@ -5581,6 +5796,8 @@ const walletReducer = handleActions({
   })
 }, defaultState$a);
 
+//      
+
 const selectState$6 = state => state.content || {};
 
 const makeSelectContentPositionForUri = uri => reselect.createSelector(selectState$6, makeSelectClaimForUri(uri), (state, claim) => {
@@ -5622,8 +5839,30 @@ const selectError = reselect.createSelector(selectState$7, state => {
 
 const selectState$8 = state => state.comments || {};
 
-const selectCommentsById = reselect.createSelector(selectState$8, state => state.byId || {});
+const selectCommentsById = reselect.createSelector(selectState$8, state => state.commentById || {});
 
+const selectCommentsByClaimId = reselect.createSelector(selectState$8, selectCommentsById, (state, byId) => {
+  const byClaimId = state.byId || {};
+  const comments = {};
+
+  // replace every comment_id in the list with the actual comment object
+  Object.keys(byClaimId).forEach(claimId => {
+    const commentIds = byClaimId[claimId];
+
+    comments[claimId] = Array(commentIds === null ? 0 : commentIds.length);
+    for (let i = 0; i < commentIds.length; i++) {
+      comments[claimId][i] = byId[commentIds[i]];
+    }
+  });
+
+  return comments;
+});
+
+// previously this used a mapping from claimId -> Array<Comments>
+/* export const selectCommentsById = createSelector(
+  selectState,
+  state => state.byId || {}
+); */
 const selectCommentsByUri = reselect.createSelector(selectState$8, state => {
   const byUri = state.commentsByUri || {};
   const comments = {};
@@ -5635,14 +5874,18 @@ const selectCommentsByUri = reselect.createSelector(selectState$8, state => {
       comments[uri] = claimId;
     }
   });
+
   return comments;
 });
 
-const makeSelectCommentsForUri = uri => reselect.createSelector(selectCommentsById, selectCommentsByUri, (byId, byUri) => {
+const makeSelectCommentsForUri = uri => reselect.createSelector(selectCommentsByClaimId, selectCommentsByUri, (byClaimId, byUri) => {
   const claimId = byUri[uri];
-  return byId && byId[claimId];
+  return byClaimId && byClaimId[claimId];
 });
 
+// todo: allow SDK to retrieve user comments through comment_list
+// todo: implement selectors for selecting comments owned by user
+
 //      
 
 const selectState$9 = state => state.tags || {};
@@ -5720,8 +5963,11 @@ exports.doCheckPendingPublishes = doCheckPendingPublishes;
 exports.doClaimSearch = doClaimSearch;
 exports.doClearPublish = doClearPublish;
 exports.doClearSupport = doClearSupport;
+exports.doCommentAbandon = doCommentAbandon;
 exports.doCommentCreate = doCommentCreate;
+exports.doCommentHide = doCommentHide;
 exports.doCommentList = doCommentList;
+exports.doCommentUpdate = doCommentUpdate;
 exports.doCreateChannel = doCreateChannel;
 exports.doDeletePurchasedUri = doDeletePurchasedUri;
 exports.doDeleteTag = doDeleteTag;
diff --git a/dist/flow-typed/Comment.js b/dist/flow-typed/Comment.js
index f2f35b7..64ea974 100644
--- a/dist/flow-typed/Comment.js
+++ b/dist/flow-typed/Comment.js
@@ -1,19 +1,23 @@
 declare type Comment = {
-  author?: string,
-  author_url?: string,
-  claim_index?: number,
-  comment_id?: number,
-  downvotes?: number,
-  message: string,
-  omitted?: number,
-  reply_count?: number,
-  time_posted?: number,
-  upvotes?: number,
-  parent_id?: number,
+  comment: string, // comment body
+  comment_id: string, // sha256 digest
+  claim_id: string, // id linking to the claim this comment
+  timestamp: number, // integer representing unix-time
+  is_hidden: boolean, // claim owner may enable/disable this
+  channel_id?: string,  // claimId of channel signing this comment
+  channel_name?: string,  // name of channel claim
+  channel_url?: string, // full lbry url to signing channel
+  signature?: string, // signature of comment by originating channel
+  signing_ts?: string, // timestamp used when signing this comment
+  is_channel_signature_valid?: boolean, // whether or not the signature could be validated
+  parent_id?: number, // comment_id of comment this is in reply to
 };
 
+// todo: relate individual comments to their commentId
 declare type CommentsState = {
-  byId: {},
-  isLoading: boolean,
   commentsByUri: { [string]: string },
-}
+  byId: { [string]: Array<string> },
+  commentById: { [string]: Comment },
+  isLoading: boolean,
+  myComments: ?Set<string>,
+};
diff --git a/dist/flow-typed/Lbry.js b/dist/flow-typed/Lbry.js
index cc8a4ac..d2657cb 100644
--- a/dist/flow-typed/Lbry.js
+++ b/dist/flow-typed/Lbry.js
@@ -125,6 +125,8 @@ declare type ChannelUpdateResponse = GenericTxResponse & {
 };
 
 declare type CommentCreateResponse = Comment;
+declare type CommentUpdateResponse = Comment;
+
 declare type CommentListResponse = {
   items: Array<Comment>,
   page: number,
@@ -133,6 +135,16 @@ declare type CommentListResponse = {
   total_pages: number,
 };
 
+declare type CommentHideResponse = {
+  // keyed by the CommentIds entered
+  [string]: { hidden: boolean },
+};
+
+declare type CommentAbandonResponse = {
+  // keyed by the CommentId given
+  abandoned: boolean,
+};
+
 declare type ChannelListResponse = {
   items: Array<ChannelClaim>,
   page: number,
@@ -242,6 +254,10 @@ declare type LbryTypes = {
   // Commenting
   comment_list: (params: {}) => Promise<CommentListResponse>,
   comment_create: (params: {}) => Promise<CommentCreateResponse>,
+  comment_update: (params: {}) => Promise<CommentUpdateResponse>,
+  comment_hide: (params: {}) => Promise<CommentHideResponse>,
+  comment_abandon: (params: {}) => Promise<CommentAbandonResponse>,
+
   // Wallet utilities
   wallet_balance: (params: {}) => Promise<BalanceResponse>,
   wallet_decrypt: (prams: {}) => Promise<boolean>,
diff --git a/flow-typed/Comment.js b/flow-typed/Comment.js
index f2f35b7..64ea974 100644
--- a/flow-typed/Comment.js
+++ b/flow-typed/Comment.js
@@ -1,19 +1,23 @@
 declare type Comment = {
-  author?: string,
-  author_url?: string,
-  claim_index?: number,
-  comment_id?: number,
-  downvotes?: number,
-  message: string,
-  omitted?: number,
-  reply_count?: number,
-  time_posted?: number,
-  upvotes?: number,
-  parent_id?: number,
+  comment: string, // comment body
+  comment_id: string, // sha256 digest
+  claim_id: string, // id linking to the claim this comment
+  timestamp: number, // integer representing unix-time
+  is_hidden: boolean, // claim owner may enable/disable this
+  channel_id?: string,  // claimId of channel signing this comment
+  channel_name?: string,  // name of channel claim
+  channel_url?: string, // full lbry url to signing channel
+  signature?: string, // signature of comment by originating channel
+  signing_ts?: string, // timestamp used when signing this comment
+  is_channel_signature_valid?: boolean, // whether or not the signature could be validated
+  parent_id?: number, // comment_id of comment this is in reply to
 };
 
+// todo: relate individual comments to their commentId
 declare type CommentsState = {
-  byId: {},
-  isLoading: boolean,
   commentsByUri: { [string]: string },
-}
+  byId: { [string]: Array<string> },
+  commentById: { [string]: Comment },
+  isLoading: boolean,
+  myComments: ?Set<string>,
+};
diff --git a/flow-typed/Lbry.js b/flow-typed/Lbry.js
index cc8a4ac..d2657cb 100644
--- a/flow-typed/Lbry.js
+++ b/flow-typed/Lbry.js
@@ -125,6 +125,8 @@ declare type ChannelUpdateResponse = GenericTxResponse & {
 };
 
 declare type CommentCreateResponse = Comment;
+declare type CommentUpdateResponse = Comment;
+
 declare type CommentListResponse = {
   items: Array<Comment>,
   page: number,
@@ -133,6 +135,16 @@ declare type CommentListResponse = {
   total_pages: number,
 };
 
+declare type CommentHideResponse = {
+  // keyed by the CommentIds entered
+  [string]: { hidden: boolean },
+};
+
+declare type CommentAbandonResponse = {
+  // keyed by the CommentId given
+  abandoned: boolean,
+};
+
 declare type ChannelListResponse = {
   items: Array<ChannelClaim>,
   page: number,
@@ -242,6 +254,10 @@ declare type LbryTypes = {
   // Commenting
   comment_list: (params: {}) => Promise<CommentListResponse>,
   comment_create: (params: {}) => Promise<CommentCreateResponse>,
+  comment_update: (params: {}) => Promise<CommentUpdateResponse>,
+  comment_hide: (params: {}) => Promise<CommentHideResponse>,
+  comment_abandon: (params: {}) => Promise<CommentAbandonResponse>,
+
   // Wallet utilities
   wallet_balance: (params: {}) => Promise<BalanceResponse>,
   wallet_decrypt: (prams: {}) => Promise<boolean>,
diff --git a/src/constants/action_types.js b/src/constants/action_types.js
index 42cf987..1f8b841 100644
--- a/src/constants/action_types.js
+++ b/src/constants/action_types.js
@@ -111,6 +111,15 @@ export const COMMENT_LIST_FAILED = 'COMMENT_LIST_FAILED';
 export const COMMENT_CREATE_STARTED = 'COMMENT_CREATE_STARTED';
 export const COMMENT_CREATE_COMPLETED = 'COMMENT_CREATE_COMPLETED';
 export const COMMENT_CREATE_FAILED = 'COMMENT_CREATE_FAILED';
+export const COMMENT_ABANDON_STARTED = 'COMMENT_ABANDON_STARTED';
+export const COMMENT_ABANDON_COMPLETED = 'COMMENT_ABANDON_COMPLETED';
+export const COMMENT_ABANDON_FAILED = 'COMMENT_ABANDON_FAILED';
+export const COMMENT_UPDATE_STARTED = 'COMMENT_UPDATE_STARTED';
+export const COMMENT_UPDATE_COMPLETED = 'COMMENT_UPDATE_COMPLETED';
+export const COMMENT_UPDATE_FAILED = 'COMMENT_UPDATE_FAILED';
+export const COMMENT_HIDE_STARTED = 'COMMENT_HIDE_STARTED';
+export const COMMENT_HIDE_COMPLETED = 'COMMENT_HIDE_COMPLETED';
+export const COMMENT_HIDE_FAILED = 'COMMENT_HIDE_FAILED';
 
 // Files
 export const FILE_LIST_STARTED = 'FILE_LIST_STARTED';
diff --git a/src/constants/shared_preferences.js b/src/constants/shared_preferences.js
index 56faf8f..e508e83 100644
--- a/src/constants/shared_preferences.js
+++ b/src/constants/shared_preferences.js
@@ -1,10 +1,10 @@
 /*
-* How to use this file:
-* Settings exported from here will trigger the setting to be
-* sent to the preference middleware when set using the
-* usual setDaemonSettings and clearDaemonSettings methods.
-*
-* See redux/settings/actions in the app for where this is used.
+ * How to use this file:
+ * Settings exported from here will trigger the setting to be
+ * sent to the preference middleware when set using the
+ * usual setDaemonSettings and clearDaemonSettings methods.
+ *
+ * See redux/settings/actions in the app for where this is used.
  */
 
 import * as DAEMON_SETTINGS from './daemon_settings';
diff --git a/src/index.js b/src/index.js
index b9d554f..3650efd 100644
--- a/src/index.js
+++ b/src/index.js
@@ -122,7 +122,13 @@ export {
 
 export { doToggleTagFollow, doAddTag, doDeleteTag } from 'redux/actions/tags';
 
-export { doCommentList, doCommentCreate } from 'redux/actions/comments';
+export {
+  doCommentList,
+  doCommentCreate,
+  doCommentAbandon,
+  doCommentHide,
+  doCommentUpdate,
+} from 'redux/actions/comments';
 
 export { doToggleBlockChannel } from 'redux/actions/blocked';
 
diff --git a/src/lbry.js b/src/lbry.js
index ceb96f3..f6cc88c 100644
--- a/src/lbry.js
+++ b/src/lbry.js
@@ -119,6 +119,11 @@ const Lbry: LbryTypes = {
   // Comments
   comment_list: (params = {}) => daemonCallWithResult('comment_list', params),
   comment_create: (params = {}) => daemonCallWithResult('comment_create', params),
+  comment_hide: (params = {}) => daemonCallWithResult('comment_hide', params),
+  comment_abandon: (params = {}) => daemonCallWithResult('comment_abandon', params),
+  // requires SDK ver. 0.53.0
+  comment_update: (params = {}) => daemonCallWithResult('comment_update', params),
+
   // Connect to the sdk
   connect: () => {
     if (Lbry.connectPromise === null) {
diff --git a/src/redux/actions/comments.js b/src/redux/actions/comments.js
index dbf1d94..4441651 100644
--- a/src/redux/actions/comments.js
+++ b/src/redux/actions/comments.js
@@ -43,7 +43,7 @@ export function doCommentCreate(
   comment: string = '',
   claim_id: string = '',
   channel: ?string,
-  parent_id?: number
+  parent_id?: string
 ) {
   return (dispatch: Dispatch, getState: GetState) => {
     const state = getState();
@@ -55,11 +55,12 @@ export function doCommentCreate(
       myChannels && myChannels.find(myChannel => myChannel.name === channel);
     const channel_id = namedChannelClaim ? namedChannelClaim.claim_id : null;
     return Lbry.comment_create({
-      comment,
-      claim_id,
-      channel_id,
+      comment: comment,
+      claim_id: claim_id,
+      channel_id: channel_id,
+      parent_id: parent_id,
     })
-      .then((result: Comment) => {
+      .then((result: CommentCreateResponse) => {
         dispatch({
           type: ACTIONS.COMMENT_CREATE_COMPLETED,
           data: {
@@ -82,3 +83,105 @@ export function doCommentCreate(
       });
   };
 }
+
+export function doCommentHide(comment_id: string) {
+  return (dispatch: Dispatch) => {
+    dispatch({
+      type: ACTIONS.COMMENT_HIDE_STARTED,
+    });
+    return Lbry.comment_hide({
+      comment_ids: [comment_id],
+    })
+      .then((result: CommentHideResponse) => {
+        dispatch({
+          type: ACTIONS.COMMENT_HIDE_COMPLETED,
+          data: result,
+        });
+      })
+      .catch(error => {
+        dispatch({
+          type: ACTIONS.COMMENT_HIDE_FAILED,
+          data: error,
+        });
+        dispatch(
+          doToast({
+            message: 'There was an error hiding this comment. Please try again later.',
+            isError: true,
+          })
+        );
+      });
+  };
+}
+
+export function doCommentAbandon(comment_id: string) {
+  return (dispatch: Dispatch) => {
+    dispatch({
+      type: ACTIONS.COMMENT_ABANDON_STARTED,
+    });
+    return Lbry.comment_abandon({
+      comment_id: comment_id,
+    })
+      .then((result: CommentAbandonResponse) => {
+        // Comment may not be deleted if the signing channel can't be signed.
+        // This will happen if the channel was recently created or abandoned.
+        if (result.abandoned) {
+          dispatch({
+            type: ACTIONS.COMMENT_ABANDON_COMPLETED,
+            data: {
+              comment_id: comment_id,
+            },
+          });
+        } else {
+          dispatch({
+            type: ACTIONS.COMMENT_ABANDON_FAILED,
+          });
+        }
+      })
+      .catch(error => {
+        dispatch({
+          type: ACTIONS.COMMENT_ABANDON_FAILED,
+          data: error,
+        });
+        dispatch(
+          doToast({
+            message: 'There was an error hiding this comment. Please try again later.',
+            isError: true,
+          })
+        );
+      });
+  };
+}
+
+export function doCommentUpdate(comment_id: string, comment: string) {
+  // if they provided an empty string, they must have wanted to abandon
+  if (comment === '') {
+    return doCommentAbandon(comment_id);
+  } else {
+    return (dispatch: Dispatch) => {
+      dispatch({
+        type: ACTIONS.COMMENT_UPDATE_STARTED,
+      });
+      return Lbry.comment_update({
+        comment_id: comment_id,
+        comment: comment,
+      })
+        .then((result: CommentUpdateResponse) => {
+          dispatch({
+            type: ACTIONS.COMMENT_UPDATE_COMPLETED,
+            data: {
+              comment: result,
+            },
+          });
+        })
+        .catch(error => {
+          dispatch({ type: ACTIONS.COMMENT_UPDATE_FAILED, data: error });
+          dispatch(
+            doToast({
+              message: 'There was an error hiding this comment. Please try again later.',
+              isError: true,
+            })
+          );
+        });
+    };
+  }
+}
diff --git a/src/redux/actions/content.js b/src/redux/actions/content.js
index fff0f11..2654f74 100644
--- a/src/redux/actions/content.js
+++ b/src/redux/actions/content.js
@@ -1,7 +1,8 @@
+// @flow
 import * as ACTIONS from 'constants/action_types';
 
 export function savePosition(claimId: string, outpoint: string, position: number) {
-  return dispatch => {
+  return (dispatch: Dispatch) => {
     dispatch({
       type: ACTIONS.SET_CONTENT_POSITION,
       data: { claimId, outpoint, position },
diff --git a/src/redux/actions/sync.js b/src/redux/actions/sync.js
index 41a25ea..7f80d33 100644
--- a/src/redux/actions/sync.js
+++ b/src/redux/actions/sync.js
@@ -14,7 +14,7 @@ type SharedData = {
 
 function extractUserState(rawObj: SharedData) {
   if (rawObj && rawObj.version === '0.1' && rawObj.value) {
-    const { subscriptions, tags, blocked, settings} = rawObj.value;
+    const { subscriptions, tags, blocked, settings } = rawObj.value;
 
     return {
       ...(subscriptions ? { subscriptions } : {}),
@@ -30,7 +30,10 @@ function extractUserState(rawObj: SharedData) {
 export function doPopulateSharedUserState(sharedSettings: any) {
   return (dispatch: Dispatch) => {
     const { subscriptions, tags, blocked, settings } = extractUserState(sharedSettings);
-    dispatch({ type: ACTIONS.USER_STATE_POPULATE, data: { subscriptions, tags, blocked, settings } });
+    dispatch({
+      type: ACTIONS.USER_STATE_POPULATE,
+      data: { subscriptions, tags, blocked, settings },
+    });
   };
 }
 
diff --git a/src/redux/reducers/blocked.js b/src/redux/reducers/blocked.js
index b69d9c9..c688936 100644
--- a/src/redux/reducers/blocked.js
+++ b/src/redux/reducers/blocked.js
@@ -33,8 +33,7 @@ export const blockedReducer = handleActions(
       const { blocked } = action.data;
       return {
         ...state,
-        blockedChannels:
-          blocked && blocked.length ? blocked : state.blockedChannels,
+        blockedChannels: blocked && blocked.length ? blocked : state.blockedChannels,
       };
     },
   },
diff --git a/src/redux/reducers/comments.js b/src/redux/reducers/comments.js
index 3d1738b..493d225 100644
--- a/src/redux/reducers/comments.js
+++ b/src/redux/reducers/comments.js
@@ -3,9 +3,11 @@ import * as ACTIONS from 'constants/action_types';
 import { handleActions } from 'util/redux-utils';
 
 const defaultState: CommentsState = {
-  byId: {},
-  commentsByUri: {},
+  commentById: {}, // commentId -> Comment
+  byId: {}, // ClaimID -> list of comments
+  commentsByUri: {}, // URI -> claimId
   isLoading: false,
+  myComments: undefined,
 };
 
 export const commentReducer = handleActions(
@@ -21,17 +23,24 @@ export const commentReducer = handleActions(
     }),
 
     [ACTIONS.COMMENT_CREATE_COMPLETED]: (state: CommentsState, action: any): CommentsState => {
-      const { comment, claimId }: any = action.data;
+      const { comment, claimId }: { comment: Comment, claimId: string } = action.data;
+      const commentById = Object.assign({}, state.commentById);
       const byId = Object.assign({}, state.byId);
       const comments = byId[claimId];
-      const newComments = comments.slice();
+      const newCommentIds = comments.slice();
 
-      newComments.unshift(comment);
-      byId[claimId] = newComments;
+      // add the comment by its ID
+      commentById[comment.comment_id] = comment;
+
+      // push the comment_id to the top of ID list
+      newCommentIds.unshift(comment.comment_id);
+      byId[claimId] = newCommentIds;
 
       return {
         ...state,
+        commentById,
         byId,
+        isLoading: false,
       };
     },
 
@@ -39,16 +48,30 @@ export const commentReducer = handleActions(
 
     [ACTIONS.COMMENT_LIST_COMPLETED]: (state: CommentsState, action: any) => {
       const { comments, claimId, uri } = action.data;
+
+      const commentById = Object.assign({}, state.commentById);
       const byId = Object.assign({}, state.byId);
       const commentsByUri = Object.assign({}, state.commentsByUri);
 
       if (comments) {
-        byId[claimId] = comments;
+        // we use an Array to preserve order of listing
+        // in reality this doesn't matter and we can just
+        // sort comments by their timestamp
+        const commentIds = Array(comments.length);
+
+        // map the comment_ids to the new comments
+        for (let i = 0; i < comments.length; i++) {
+          commentIds[i] = comments[i].comment_id;
+          commentById[commentIds[i]] = comments[i];
+        }
+
+        byId[claimId] = commentIds;
         commentsByUri[uri] = claimId;
       }
       return {
         ...state,
         byId,
+        commentById,
         commentsByUri,
         isLoading: false,
       };
@@ -58,6 +81,76 @@ export const commentReducer = handleActions(
       ...state,
       isLoading: false,
     }),
+    [ACTIONS.COMMENT_ABANDON_STARTED]: (state: CommentsState, action: any) => ({
+      ...state,
+      isLoading: true,
+    }),
+    [ACTIONS.COMMENT_ABANDON_COMPLETED]: (state: CommentsState, action: any) => {
+      const { comment_id } = action.data;
+      const commentById = Object.assign({}, state.commentById);
+      const byId = Object.assign({}, state.byId);
+
+      // to remove the comment and its references
+      const claimId = commentById[comment_id].claim_id;
+      for (let i = 0; i < byId[claimId].length; i++) {
+        if (byId[claimId][i] === comment_id) {
+          byId[claimId].splice(i, 1);
+          break;
+        }
+      }
+      delete commentById[comment_id];
+
+      return {
+        ...state,
+        commentById,
+        byId,
+        isLoading: false,
+      };
+    },
+    // do nothing
+    [ACTIONS.COMMENT_ABANDON_FAILED]: (state: CommentsState, action: any) => ({
+      ...state,
+      isLoading: false,
+    }),
+    // do nothing
+    [ACTIONS.COMMENT_UPDATE_STARTED]: (state: CommentsState, action: any) => ({
+      ...state,
+      isLoading: true,
+    }),
+    // replace existing comment with comment returned here under its comment_id
+    [ACTIONS.COMMENT_UPDATE_COMPLETED]: (state: CommentsState, action: any) => {
+      const { comment } = action.data;
+      const commentById = Object.assign({}, state.commentById);
+
+      if (comment) {
+        commentById[comment.comment_id] = comment;
+      }
+
+      return {
+        ...state,
+        commentById,
+        isLoading: false,
+      };
+    },
+    // nothing can be done here
+    [ACTIONS.COMMENT_UPDATE_FAILED]: (state: CommentsState, action: any) => ({
+      ...state,
+      isLoading: false,
+    }),
+    // nothing can really be done here
+    [ACTIONS.COMMENT_HIDE_STARTED]: (state: CommentsState, action: any) => ({
+      ...state,
+      isLoading: true,
+    }),
+    [ACTIONS.COMMENT_HIDE_COMPLETED]: (state: CommentsState, action: any) => ({
+      ...state, // todo: add HiddenComments state & create selectors
+      isLoading: false,
+    }),
+    // nothing can be done here
+    [ACTIONS.COMMENT_HIDE_FAILED]: (state: CommentsState, action: any) => ({
+      ...state,
+      isLoading: false,
+    }),
   },
   defaultState
 );
diff --git a/src/redux/selectors/comments.js b/src/redux/selectors/comments.js
index c391a5c..c3a2f2d 100644
--- a/src/redux/selectors/comments.js
+++ b/src/redux/selectors/comments.js
@@ -5,9 +5,35 @@ const selectState = state => state.comments || {};
 
 export const selectCommentsById = createSelector(
   selectState,
-  state => state.byId || {}
+  state => state.commentById || {}
 );
 
+export const selectCommentsByClaimId = createSelector(
+  selectState,
+  selectCommentsById,
+  (state, byId) => {
+    const byClaimId = state.byId || {};
+    const comments = {};
+
+    // replace every comment_id in the list with the actual comment object
+    Object.keys(byClaimId).forEach(claimId => {
+      const commentIds = byClaimId[claimId];
+
+      comments[claimId] = Array(commentIds === null ? 0 : commentIds.length);
+      for (let i = 0; i < commentIds.length; i++) {
+        comments[claimId][i] = byId[commentIds[i]];
+      }
+    });
+
+    return comments;
+  }
+);
+
+// previously this used a mapping from claimId -> Array<Comments>
+/* export const selectCommentsById = createSelector(
+  selectState,
+  state => state.byId || {}
+); */
 export const selectCommentsByUri = createSelector(
   selectState,
   state => {
@@ -21,16 +47,20 @@ export const selectCommentsByUri = createSelector(
         comments[uri] = claimId;
       }
     });
+
     return comments;
   }
 );
 
 export const makeSelectCommentsForUri = (uri: string) =>
   createSelector(
-    selectCommentsById,
+    selectCommentsByClaimId,
     selectCommentsByUri,
-    (byId, byUri) => {
+    (byClaimId, byUri) => {
       const claimId = byUri[uri];
-      return byId && byId[claimId];
+      return byClaimId && byClaimId[claimId];
     }
   );
+
+// todo: allow SDK to retrieve user comments through comment_list
+// todo: implement selectors for selecting comments owned by user
diff --git a/src/redux/selectors/content.js b/src/redux/selectors/content.js
index f494fab..2daac6e 100644
--- a/src/redux/selectors/content.js
+++ b/src/redux/selectors/content.js
@@ -1,14 +1,19 @@
+// @flow
 import { createSelector } from 'reselect';
 import { makeSelectClaimForUri } from 'redux/selectors/claims';
 
 export const selectState = (state: any) => state.content || {};
 
 export const makeSelectContentPositionForUri = (uri: string) =>
-  createSelector(selectState, makeSelectClaimForUri(uri), (state, claim) => {
-    if (!claim) {
-      return null;
+  createSelector(
+    selectState,
+    makeSelectClaimForUri(uri),
+    (state, claim) => {
+      if (!claim) {
+        return null;
+      }
+      const outpoint = `${claim.txid}:${claim.nout}`;
+      const id = claim.claim_id;
+      return state.positions[id] ? state.positions[id][outpoint] : null;
     }
-    const outpoint = `${claim.txid}:${claim.nout}`;
-    const id = claim.claim_id;
-    return state.positions[id] ? state.positions[id][outpoint] : null;
-  });
+  );
diff --git a/src/redux/selectors/notifications.js b/src/redux/selectors/notifications.js
index 00844be..8894442 100644
--- a/src/redux/selectors/notifications.js
+++ b/src/redux/selectors/notifications.js
@@ -1,26 +1,32 @@
 import { createSelector } from 'reselect';
 
-export const selectState = (state) => state.notifications || {};
+export const selectState = state => state.notifications || {};
 
-export const selectToast = createSelector(selectState, (state) => {
-  if (state.toasts.length) {
-    const { id, params } = state.toasts[0];
-    return {
-      id,
-      ...params,
-    };
+export const selectToast = createSelector(
+  selectState,
+  state => {
+    if (state.toasts.length) {
+      const { id, params } = state.toasts[0];
+      return {
+        id,
+        ...params,
+      };
+    }
+
+    return null;
   }
+);
 
-  return null;
-});
+export const selectError = createSelector(
+  selectState,
+  state => {
+    if (state.errors.length) {
+      const { error } = state.errors[0];
+      return {
+        error,
+      };
+    }
 
-export const selectError = createSelector(selectState, (state) => {
-  if (state.errors.length) {
-    const { error } = state.errors[0];
-    return {
-      error,
-    };
+    return null;
   }
-
-  return null;
-});
+);