src/components/AppBar/AppBar.tsx

@@ -37,7 +37,7 @@ import { setUserRobotImage } from '../../store/userRobotImage/action'
 import { Container } from '../Container'
 import { ButtonIcon } from '../ButtonIcon'
 
-const metadataController = new MetadataController()
+const metadataController = MetadataController.getInstance()
 
 export const AppBar = () => {
   const navigate = useNavigate()

src/components/DisplaySigit/index.tsx

@@ -1,7 +1,7 @@
 import { Meta } from '../../types'
 import { SigitCardDisplayInfo, SigitStatus, SignStatus } from '../../utils'
 import { Link } from 'react-router-dom'
-import { formatTimestamp, hexToNpub, npubToHex, shorten } from '../../utils'
+import { formatTimestamp, npubToHex } from '../../utils'
 import { appPublicRoutes, appPrivateRoutes } from '../../routes'
 import { Button, Divider, Tooltip } from '@mui/material'
 import { DisplaySigner } from '../DisplaySigner'
@@ -17,9 +17,7 @@ import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
 import { UserAvatarGroup } from '../UserAvatarGroup'
 
 import styles from './style.module.scss'
-import { TooltipChild } from '../TooltipChild'
 import { getExtensionIconLabel } from '../getExtensionIconLabel'
-import { useSigitProfiles } from '../../hooks/useSigitProfiles'
 import { useSigitMeta } from '../../hooks/useSigitMeta'
 import { extractFileExtensions } from '../../utils/file'
 
@@ -33,12 +31,6 @@ export const DisplaySigit = ({ meta, parsedMeta }: SigitProps) => {
     parsedMeta
 
   const { signersStatus, fileHashes } = useSigitMeta(meta)
-
-  const profiles = useSigitProfiles([
-    ...(submittedBy ? [submittedBy] : []),
-    ...signers
-  ])
-
   const { extensions, isSame } = extractFileExtensions(Object.keys(fileHashes))
 
   return (
@@ -54,62 +46,29 @@ export const DisplaySigit = ({ meta, parsedMeta }: SigitProps) => {
       ></Link>
       <p className={`line-clamp-2 ${styles.title}`}>{title}</p>
       <div className={styles.users}>
-        {submittedBy &&
+        {submittedBy && (
-          (function () {
+          <DisplaySigner
-            const profile = profiles[submittedBy]
+            status={isValid ? SignStatus.Signed : SignStatus.Invalid}
-            return (
+            pubkey={submittedBy}
-              <Tooltip
+          />
-                key={submittedBy}
+        )}
-                title={
-                  profile?.display_name ||
-                  profile?.name ||
-                  shorten(hexToNpub(submittedBy))
-                }
-                placement="top"
-                arrow
-                disableInteractive
-              >
-                <TooltipChild>
-                  <DisplaySigner
-                    status={isValid ? SignStatus.Signed : SignStatus.Invalid}
-                    profile={profile}
-                    pubkey={submittedBy}
-                  />
-                </TooltipChild>
-              </Tooltip>
-            )
-          })()}
         {submittedBy && signers.length ? (
           <Divider orientation="vertical" flexItem />
         ) : null}
         <UserAvatarGroup max={7}>
           {signers.map((signer) => {
             const pubkey = npubToHex(signer)!
-            const profile = profiles[pubkey]
-
             return (
-              <Tooltip
+              <DisplaySigner
-                key={signer}
+                key={pubkey}
-                title={
+                status={signersStatus[signer]}
-                  profile?.display_name || profile?.name || shorten(pubkey)
+                pubkey={pubkey}
-                }
+              />
-                placement="top"
-                arrow
-                disableInteractive
-              >
-                <TooltipChild>
-                  <DisplaySigner
-                    status={signersStatus[signer]}
-                    profile={profile}
-                    pubkey={pubkey}
-                  />
-                </TooltipChild>
-              </Tooltip>
             )
           })}
         </UserAvatarGroup>
       </div>
-      <div className={`${styles.details} ${styles.date} ${styles.iconLabel}`}>
+      <div className={`${styles.details} ${styles.iconLabel}`}>
         <FontAwesomeIcon icon={faCalendar} />
         {createdAt ? formatTimestamp(createdAt) : null}
       </div>

src/components/DisplaySigner/index.tsx

@@ -1,5 +1,4 @@
 import { Badge } from '@mui/material'
-import { ProfileMetadata } from '../../types'
 import styles from './style.module.scss'
 import { UserAvatar } from '../UserAvatar'
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
@@ -15,38 +14,33 @@ import { SignStatus } from '../../utils'
 import { Spinner } from '../Spinner'
 
 type DisplaySignerProps = {
-  profile: ProfileMetadata
   pubkey: string
   status: SignStatus
 }
 
-export const DisplaySigner = ({
+const getStatusIcon = (status: SignStatus) => {
-  status,
+  switch (status) {
-  profile,
+    case SignStatus.Signed:
-  pubkey
+      return <FontAwesomeIcon icon={faCheck} />
-}: DisplaySignerProps) => {
+    case SignStatus.Awaiting:
-  const getStatusIcon = (status: SignStatus) => {
+      return (
-    switch (status) {
+        <Spinner>
-      case SignStatus.Signed:
+          <FontAwesomeIcon icon={faHourglass} />
-        return <FontAwesomeIcon icon={faCheck} />
+        </Spinner>
-      case SignStatus.Awaiting:
+      )
-        return (
+    case SignStatus.Pending:
-          <Spinner>
+      return <FontAwesomeIcon icon={faEllipsis} />
-            <FontAwesomeIcon icon={faHourglass} />
+    case SignStatus.Invalid:
-          </Spinner>
+      return <FontAwesomeIcon icon={faExclamation} />
-        )
+    case SignStatus.Viewer:
-      case SignStatus.Pending:
+      return <FontAwesomeIcon icon={faEye} />
-        return <FontAwesomeIcon icon={faEllipsis} />
-      case SignStatus.Invalid:
-        return <FontAwesomeIcon icon={faExclamation} />
-      case SignStatus.Viewer:
-        return <FontAwesomeIcon icon={faEye} />
 
-      default:
+    default:
-        return <FontAwesomeIcon icon={faQuestion} />
+      return <FontAwesomeIcon icon={faQuestion} />
-    }
   }
+}
 
+export const DisplaySigner = ({ status, pubkey }: DisplaySignerProps) => {
   return (
     <Badge
       className={styles.signer}
@@ -56,7 +50,7 @@ export const DisplaySigner = ({
         <div className={styles.statusBadge}>{getStatusIcon(status)}</div>
       }
     >
-      <UserAvatar pubkey={pubkey} image={profile?.picture} />
+      <UserAvatar pubkey={pubkey} />
     </Badge>
   )
 }

src/components/UserAvatar/index.tsx

@@ -3,34 +3,56 @@ import { getProfileRoute } from '../../routes'
 import styles from './styles.module.scss'
 import { AvatarIconButton } from '../UserAvatarIconButton'
 import { Link } from 'react-router-dom'
+import { useProfileMetadata } from '../../hooks/useProfileMetadata'
+import { Tooltip } from '@mui/material'
+import { shorten } from '../../utils'
+import { TooltipChild } from '../TooltipChild'
 
 interface UserAvatarProps {
-  name?: string
   pubkey: string
-  image?: string
+  isNameVisible?: boolean
 }
 
 /**
  *  This component will be used for the displaying username and profile picture.
  *  Clicking will navigate to the user's profile.
  */
-export const UserAvatar = ({ pubkey, name, image }: UserAvatarProps) => {
+export const UserAvatar = ({
+  pubkey,
+  isNameVisible = false
+}: UserAvatarProps) => {
+  const profile = useProfileMetadata(pubkey)
+  const name = profile?.display_name || profile?.name || shorten(pubkey)
+  const image = profile?.picture
+
   return (
     <Link
       to={getProfileRoute(pubkey)}
       className={styles.container}
       tabIndex={-1}
     >
-      <AvatarIconButton
+      <Tooltip
-        src={image}
+        key={pubkey}
-        hexKey={pubkey}
+        title={name}
-        aria-label={`account of user ${name || pubkey}`}
+        placement="top"
-        color="inherit"
+        arrow
-        sx={{
+        disableInteractive
-          padding: 0
+      >
-        }}
+        <TooltipChild>
-      />
+          <AvatarIconButton
-      {name ? <span className={styles.username}>{name}</span> : null}
+            src={image}
+            hexKey={pubkey}
+            aria-label={`account of user ${name}`}
+            color="inherit"
+            sx={{
+              padding: 0
+            }}
+          />
+        </TooltipChild>
+      </Tooltip>
+      {isNameVisible && name ? (
+        <span className={styles.username}>{name}</span>
+      ) : null}
     </Link>
   )
 }

src/components/UsersDetails.tsx/index.tsx

@@ -1,11 +1,9 @@
 import { Divider, Tooltip } from '@mui/material'
-import { useSigitProfiles } from '../../hooks/useSigitProfiles'
 import {
   formatTimestamp,
   fromUnixTimestamp,
   hexToNpub,
   npubToHex,
-  shorten,
   SignStatus
 } from '../../utils'
 import { useSigitMeta } from '../../hooks/useSigitMeta'
@@ -24,10 +22,10 @@ import {
 import { getExtensionIconLabel } from '../getExtensionIconLabel'
 import { useSelector } from 'react-redux'
 import { State } from '../../store/rootReducer'
-import { TooltipChild } from '../TooltipChild'
 import { DisplaySigner } from '../DisplaySigner'
 import { Meta } from '../../types'
 import { extractFileExtensions } from '../../utils/file'
+import { UserAvatar } from '../UserAvatar'
 
 interface UsersDetailsProps {
   meta: Meta
@@ -36,6 +34,7 @@ interface UsersDetailsProps {
 export const UsersDetails = ({ meta }: UsersDetailsProps) => {
   const {
     submittedBy,
+    exportedBy,
     signers,
     viewers,
     fileHashes,
@@ -47,11 +46,6 @@ export const UsersDetails = ({ meta }: UsersDetailsProps) => {
     isValid
   } = useSigitMeta(meta)
   const { usersPubkey } = useSelector((state: State) => state.auth)
-  const profiles = useSigitProfiles([
-    ...(submittedBy ? [submittedBy] : []),
-    ...signers,
-    ...viewers
-  ])
   const userCanSign =
     typeof usersPubkey !== 'undefined' &&
     signers.includes(hexToNpub(usersPubkey))
@@ -63,31 +57,12 @@ export const UsersDetails = ({ meta }: UsersDetailsProps) => {
       <div className={styles.section}>
         <p>Signers</p>
         <div className={styles.users}>
-          {submittedBy &&
+          {submittedBy && (
-            (function () {
+            <DisplaySigner
-              const profile = profiles[submittedBy]
+              status={isValid ? SignStatus.Signed : SignStatus.Invalid}
-              return (
+              pubkey={submittedBy}
-                <Tooltip
+            />
-                  key={submittedBy}
+          )}
-                  title={
-                    profile?.display_name ||
-                    profile?.name ||
-                    shorten(hexToNpub(submittedBy))
-                  }
-                  placement="top"
-                  arrow
-                  disableInteractive
-                >
-                  <TooltipChild>
-                    <DisplaySigner
-                      status={isValid ? SignStatus.Signed : SignStatus.Invalid}
-                      profile={profile}
-                      pubkey={submittedBy}
-                    />
-                  </TooltipChild>
-                </Tooltip>
-              )
-            })()}
 
           {submittedBy && signers.length ? (
             <Divider orientation="vertical" flexItem />
@@ -96,26 +71,12 @@ export const UsersDetails = ({ meta }: UsersDetailsProps) => {
           <UserAvatarGroup max={20}>
             {signers.map((signer) => {
               const pubkey = npubToHex(signer)!
-              const profile = profiles[pubkey]
-
               return (
-                <Tooltip
+                <DisplaySigner
-                  key={signer}
+                  key={pubkey}
-                  title={
+                  status={signersStatus[signer]}
-                    profile?.display_name || profile?.name || shorten(pubkey)
+                  pubkey={pubkey}
-                  }
+                />
-                  placement="top"
-                  arrow
-                  disableInteractive
-                >
-                  <TooltipChild>
-                    <DisplaySigner
-                      status={signersStatus[signer]}
-                      profile={profile}
-                      pubkey={pubkey}
-                    />
-                  </TooltipChild>
-                </Tooltip>
               )
             })}
           </UserAvatarGroup>
@@ -128,34 +89,28 @@ export const UsersDetails = ({ meta }: UsersDetailsProps) => {
               <UserAvatarGroup max={20}>
                 {viewers.map((signer) => {
                   const pubkey = npubToHex(signer)!
-                  const profile = profiles[pubkey]
 
                   return (
-                    <Tooltip
+                    <DisplaySigner
-                      key={signer}
+                      key={pubkey}
-                      title={
+                      status={SignStatus.Viewer}
-                        profile?.display_name ||
+                      pubkey={pubkey}
-                        profile?.name ||
+                    />
-                        shorten(pubkey)
-                      }
-                      placement="top"
-                      arrow
-                      disableInteractive
-                    >
-                      <TooltipChild>
-                        <DisplaySigner
-                          status={SignStatus.Viewer}
-                          profile={profile}
-                          pubkey={pubkey}
-                        />
-                      </TooltipChild>
-                    </Tooltip>
                   )
                 })}
               </UserAvatarGroup>
             </div>
           </>
         )}
+
+        {exportedBy && (
+          <>
+            <p>Exported By</p>
+            <div className={styles.users}>
+              <UserAvatar pubkey={exportedBy} />
+            </div>
+          </>
+        )}
       </div>
       <div className={styles.section}>
         <p>Details</p>

src/controllers/AuthController.ts

@@ -25,7 +25,7 @@ export class AuthController {
 
   constructor() {
     this.nostrController = NostrController.getInstance()
-    this.metadataController = new MetadataController()
+    this.metadataController = MetadataController.getInstance()
   }
 
   /**

src/controllers/MetadataController.ts

@@ -22,6 +22,7 @@ import {
 import { DEFAULT_LOOK_UP_RELAY_LIST } from '../utils/const'
 
 export class MetadataController extends EventEmitter {
+  private static instance: MetadataController
   private nostrController: NostrController
   private specialMetadataRelay = 'wss://purplepag.es'
   private pendingFetches = new Map<string, Promise<Event | null>>() // Track pending fetches
@@ -31,6 +32,13 @@ export class MetadataController extends EventEmitter {
     this.nostrController = NostrController.getInstance()
   }
 
+  public static getInstance(): MetadataController {
+    if (!MetadataController.instance) {
+      MetadataController.instance = new MetadataController()
+    }
+    return MetadataController.instance
+  }
+
   /**
    * Asynchronously checks for more recent metadata events authored by a specific key.
    * If a more recent metadata event is found, it is handled and returned.
@@ -119,7 +127,6 @@ export class MetadataController extends EventEmitter {
       // Check if the cached metadata is older than one day
       if (isOlderThanOneDay(cachedMetadataEvent.cachedAt)) {
         // If older than one week, find the metadata from relays in background
-
         this.checkForMoreRecentMetadata(hexKey, cachedMetadataEvent.event)
       }
 

src/hooks/useProfileMetadata.tsx

@@ -0,0 +1,46 @@
+import { useEffect, useState } from 'react'
+import { ProfileMetadata } from '../types/profile'
+import { MetadataController } from '../controllers/MetadataController'
+import { Event, kinds } from 'nostr-tools'
+
+export const useProfileMetadata = (pubkey: string) => {
+  const [profileMetadata, setProfileMetadata] = useState<ProfileMetadata>()
+
+  useEffect(() => {
+    const metadataController = MetadataController.getInstance()
+    const handleMetadataEvent = (event: Event) => {
+      const metadataContent =
+        metadataController.extractProfileMetadataContent(event)
+
+      if (metadataContent) {
+        setProfileMetadata(metadataContent)
+      }
+    }
+
+    if (pubkey) {
+      metadataController.on(pubkey, (kind: number, event: Event) => {
+        if (kind === kinds.Metadata) {
+          handleMetadataEvent(event)
+        }
+      })
+
+      metadataController
+        .findMetadata(pubkey)
+        .then((metadataEvent) => {
+          if (metadataEvent) handleMetadataEvent(metadataEvent)
+        })
+        .catch((err) => {
+          console.error(
+            `error occurred in finding metadata for: ${pubkey}`,
+            err
+          )
+        })
+    }
+
+    return () => {
+      metadataController.off(pubkey, handleMetadataEvent)
+    }
+  }, [pubkey])
+
+  return profileMetadata
+}

src/hooks/useSigitMeta.tsx

@@ -33,6 +33,10 @@ export interface FlatMeta
   // Remove pubkey and use submittedBy as `npub1${string}`
   submittedBy?: `npub1${string}`
 
+  // Optional field only present on exported sigits
+  // Exporting adds user's pubkey
+  exportedBy?: `npub1${string}`
+
   // Remove created_at and replace with createdAt
   createdAt?: number
 
@@ -68,6 +72,7 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
   const [tags, setTags] = useState<string[][]>()
   const [createdAt, setCreatedAt] = useState<number>()
   const [submittedBy, setSubmittedBy] = useState<`npub1${string}`>() // submittedBy, pubkey from nostr event
+  const [exportedBy, setExportedBy] = useState<`npub1${string}`>() // pubkey from export signature nostr event
   const [id, setId] = useState<string>()
   const [sig, setSig] = useState<string>()
 
@@ -99,6 +104,18 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
     if (!meta) return
     ;(async function () {
       try {
+        if (meta.exportSignature) {
+          const exportSignatureEvent = await parseNostrEvent(
+            meta.exportSignature
+          )
+          if (
+            verifyEvent(exportSignatureEvent) &&
+            exportSignatureEvent.pubkey
+          ) {
+            setExportedBy(exportSignatureEvent.pubkey as `npub1${string}`)
+          }
+        }
+
         const createSignatureEvent = await parseNostrEvent(meta.createSignature)
 
         const { kind, tags, created_at, pubkey, id, sig, content } =
@@ -265,6 +282,7 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
     tags,
     createdAt,
     submittedBy,
+    exportedBy,
     id,
     sig,
     signers,

src/hooks/useSigitProfiles.tsx

@@ -1,71 +0,0 @@
-import { useEffect, useState } from 'react'
-import { ProfileMetadata } from '../types'
-import { MetadataController } from '../controllers'
-import { npubToHex } from '../utils'
-import { Event, kinds } from 'nostr-tools'
-
-/**
- * Extracts profiles from metadata events
- * @param pubkeys Array of npubs to check
- * @returns ProfileMetadata
- */
-export const useSigitProfiles = (
-  pubkeys: `npub1${string}`[]
-): { [key: string]: ProfileMetadata } => {
-  const [profileMetadata, setProfileMetadata] = useState<{
-    [key: string]: ProfileMetadata
-  }>({})
-
-  useEffect(() => {
-    if (pubkeys.length) {
-      const metadataController = new MetadataController()
-
-      // Remove duplicate keys
-      const users = new Set<string>([...pubkeys])
-
-      const handleMetadataEvent = (key: string) => (event: Event) => {
-        const metadataContent =
-          metadataController.extractProfileMetadataContent(event)
-
-        if (metadataContent) {
-          setProfileMetadata((prev) => ({
-            ...prev,
-            [key]: metadataContent
-          }))
-        }
-      }
-
-      users.forEach((user) => {
-        const hexKey = npubToHex(user)
-        if (hexKey && !(hexKey in profileMetadata)) {
-          metadataController.on(hexKey, (kind: number, event: Event) => {
-            if (kind === kinds.Metadata) {
-              handleMetadataEvent(hexKey)(event)
-            }
-          })
-
-          metadataController
-            .findMetadata(hexKey)
-            .then((metadataEvent) => {
-              if (metadataEvent) handleMetadataEvent(hexKey)(metadataEvent)
-            })
-            .catch((err) => {
-              console.error(
-                `error occurred in finding metadata for: ${user}`,
-                err
-              )
-            })
-        }
-      })
-
-      return () => {
-        users.forEach((key) => {
-          metadataController.off(key, handleMetadataEvent(key))
-        })
-      }
-    }
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [pubkeys])
-
-  return profileMetadata
-}

src/layouts/Main.tsx

@@ -38,7 +38,7 @@ export const MainLayout = () => {
   const hasSubscribed = useRef(false)
 
   useEffect(() => {
-    const metadataController = new MetadataController()
+    const metadataController = MetadataController.getInstance()
 
     const logout = () => {
       dispatch(

src/pages/create/index.tsx

@@ -36,7 +36,6 @@ import {
   npubToHex,
   queryNip05,
   sendNotification,
-  shorten,
   signEventForMetaFile,
   updateUsersAppData,
   uploadToFileStorage
@@ -113,6 +112,8 @@ export const CreatePage = () => {
   const [error, setError] = useState<string>()
 
   const [users, setUsers] = useState<User[]>([])
+  const signers = users.filter((u) => u.role === UserRole.signer)
+  const viewers = users.filter((u) => u.role === UserRole.viewer)
 
   const usersPubkey = useSelector((state: State) => state.auth.usersPubkey)
 
@@ -252,7 +253,7 @@ export const CreatePage = () => {
   useEffect(() => {
     users.forEach((user) => {
       if (!(user.pubkey in metadata)) {
-        const metadataController = new MetadataController()
+        const metadataController = MetadataController.getInstance()
 
         const handleMetadataEvent = (event: Event) => {
           const metadataContent =
@@ -647,6 +648,11 @@ export const CreatePage = () => {
     }
 
     saveAs(finalZipFile, `request-${unixNow()}.sigit.zip`)
+
+    // If user is the next signer, we can navigate directly to sign page
+    if (signers[0].pubkey === usersPubkey) {
+      navigate(appPrivateRoutes.sign, { state: { uploadedZip: finalZipFile } })
+    }
     setIsLoading(false)
   }
 
@@ -672,9 +678,6 @@ export const CreatePage = () => {
     },
     zipUrl: string
   ) => {
-    const signers = users.filter((user) => user.role === UserRole.signer)
-    const viewers = users.filter((user) => user.role === UserRole.viewer)
-
     const content: CreateSignatureEventContent = {
       signers: signers.map((signer) => hexToNpub(signer.pubkey)),
       viewers: viewers.map((viewer) => hexToNpub(viewer.pubkey)),
@@ -703,9 +706,6 @@ export const CreatePage = () => {
 
   // Send notifications to signers and viewers
   const sendNotifications = (meta: Meta) => {
-    const signers = users.filter((user) => user.role === UserRole.signer)
-    const viewers = users.filter((user) => user.role === UserRole.viewer)
-
     // no need to send notification to self so remove it from the list
     const receivers = (
       signers.length > 0
@@ -787,7 +787,7 @@ export const CreatePage = () => {
             toast.error('Failed to publish notifications')
           })
 
-        navigate(appPrivateRoutes.sign, { state: { meta: meta } })
+        navigate(appPrivateRoutes.sign, { state: { meta } })
       } else {
         const zip = new JSZip()
 
@@ -914,7 +914,6 @@ export const CreatePage = () => {
             <div className={styles.flexWrap}>
               <div className={`${styles.paperGroup} ${styles.users}`}>
                 <DisplayUser
-                  metadata={metadata}
                   users={users}
                   handleUserRoleChange={handleUserRoleChange}
                   handleRemoveUser={handleRemoveUser}
@@ -1011,7 +1010,6 @@ export const CreatePage = () => {
 }
 
 type DisplayUsersProps = {
-  metadata: { [key: string]: ProfileMetadata }
   users: User[]
   handleUserRoleChange: (role: UserRole, pubkey: string) => void
   handleRemoveUser: (pubkey: string) => void
@@ -1019,7 +1017,6 @@ type DisplayUsersProps = {
 }
 
 const DisplayUser = ({
-  metadata,
   users,
   handleUserRoleChange,
   handleRemoveUser,
@@ -1033,7 +1030,6 @@ const DisplayUser = ({
           .map((user, index) => (
             <SignerCounterpart
               key={`signer-${user.pubkey}`}
-              userMeta={metadata[user.pubkey]}
               user={user}
               index={index}
               moveSigner={moveSigner}
@@ -1048,7 +1044,6 @@ const DisplayUser = ({
           return (
             <div className={styles.user} key={`viewer-${user.pubkey}`}>
               <Counterpart
-                userMeta={metadata[user.pubkey]}
                 user={user}
                 handleUserRoleChange={handleUserRoleChange}
                 handleRemoveUser={handleRemoveUser}
@@ -1067,7 +1062,6 @@ interface DragItem {
 }
 
 type CounterpartProps = {
-  userMeta: ProfileMetadata
   user: User
   handleUserRoleChange: (role: UserRole, pubkey: string) => void
   handleRemoveUser: (pubkey: string) => void
@@ -1079,7 +1073,6 @@ type SignerCounterpartProps = CounterpartProps & {
 }
 
 const SignerCounterpart = ({
-  userMeta,
   user,
   index,
   moveSigner,
@@ -1172,7 +1165,6 @@ const SignerCounterpart = ({
       <FontAwesomeIcon width={'14px'} fontSize={'14px'} icon={faGripLines} />
       <Counterpart
         user={user}
-        userMeta={userMeta}
         handleRemoveUser={handleRemoveUser}
         handleUserRoleChange={handleUserRoleChange}
       />
@@ -1181,7 +1173,6 @@ const SignerCounterpart = ({
 }
 
 const Counterpart = ({
-  userMeta,
   user,
   handleUserRoleChange,
   handleRemoveUser
@@ -1189,15 +1180,7 @@ const Counterpart = ({
   return (
     <>
       <div className={styles.avatar}>
-        <UserAvatar
+        <UserAvatar pubkey={user.pubkey} isNameVisible={true} />
-          pubkey={user.pubkey}
-          name={
-            userMeta?.display_name ||
-            userMeta?.name ||
-            shorten(hexToNpub(user.pubkey))
-          }
-          image={userMeta?.picture}
-        />
       </div>
       <Tooltip title="Toggle User Role" arrow disableInteractive>
         <Button

src/pages/nostr/index.tsx

@@ -35,7 +35,7 @@ export const Nostr = () => {
   const navigate = useNavigate()
 
   const authController = new AuthController()
-  const metadataController = new MetadataController()
+  const metadataController = MetadataController.getInstance()
   const nostrController = NostrController.getInstance()
 
   const [isLoading, setIsLoading] = useState(false)

src/pages/profile/index.tsx

@@ -27,7 +27,7 @@ export const ProfilePage = () => {
 
   const { npub } = useParams()
 
-  const metadataController = useMemo(() => new MetadataController(), [])
+  const metadataController = useMemo(() => MetadataController.getInstance(), [])
 
   const [pubkey, setPubkey] = useState<string>()
   const [nostrJoiningBlock, setNostrJoiningBlock] =

src/pages/settings/profile/index.tsx

@@ -12,7 +12,7 @@ import {
   useTheme
 } from '@mui/material'
 import { UnsignedEvent, nip19, kinds, VerifiedEvent, Event } from 'nostr-tools'
-import React, { useEffect, useMemo, useRef, useState } from 'react'
+import React, { useEffect, useRef, useState } from 'react'
 import { Link, useParams } from 'react-router-dom'
 import { toast } from 'react-toastify'
 import { MetadataController, NostrController } from '../../../controllers'
@@ -41,7 +41,7 @@ export const ProfileSettingsPage = () => {
 
   const dispatch: Dispatch = useDispatch()
 
-  const metadataController = useMemo(() => new MetadataController(), [])
+  const metadataController = MetadataController.getInstance()
   const nostrController = NostrController.getInstance()
 
   const [pubkey, setPubkey] = useState<string>()

src/pages/sign/index.tsx

@@ -33,7 +33,8 @@ import {
   sendNotification,
   signEventForMetaFile,
   updateUsersAppData,
-  findOtherUserMarks
+  findOtherUserMarks,
+  timeout
 } from '../../utils'
 import { Container } from '../../components/Container'
 import { DisplayMeta } from './internal/displayMeta'
@@ -276,17 +277,10 @@ export const SignPage = () => {
           setAuthUrl(url)
         })
 
-        // Set up timeout promise to handle encryption timeout
+        // decrypt the encryptionKey, with timeout (duration = 60 seconds)
-        const timeoutPromise = new Promise<never>((_, reject) => {
-          setTimeout(() => {
-            reject(new Error('Timeout occurred'))
-          }, 60000) // Timeout duration = 60 seconds
-        })
-
-        // decrypt the encryptionKey, with timeout
         const encryptionKey = await Promise.race([
           nostrController.nip04Decrypt(sender, key),
-          timeoutPromise
+          timeout(60000)
         ])
           .then((res) => {
             return res
@@ -468,20 +462,20 @@ export const SignPage = () => {
     const fileNames = Object.values(zip.files)
       .filter((entry) => entry.name.startsWith('files/') && !entry.dir)
       .map((entry) => entry.name)
-      .map((entry) => entry.replace(/^files\//, ''))
 
-    // generate hashes for all entries in files folder of zipArchive
+    for (const zipFilePath of fileNames) {
-    // these hashes can be used to verify the originality of files
-    for (const fileName of fileNames) {
       const arrayBuffer = await readContentOfZipEntry(
         zip,
-        fileName,
+        zipFilePath,
         'arraybuffer'
       )
 
+      const fileName = zipFilePath.replace(/^files\//, '')
       if (arrayBuffer) {
         files[fileName] = await convertToSigitFile(arrayBuffer, fileName)
 
+        // generate hashes for all entries in files folder of zipArchive
+        // these hashes can be used to verify the originality of files
         const hash = await getHash(arrayBuffer)
         if (hash) {
           fileHashes[fileName] = hash

src/pages/sign/internal/displayMeta.tsx

@@ -32,7 +32,7 @@ import { useState, useEffect } from 'react'
 import { toast } from 'react-toastify'
 import { UserAvatar } from '../../../components/UserAvatar'
 import { MetadataController } from '../../../controllers'
-import { npubToHex, shorten, hexToNpub, parseJson } from '../../../utils'
+import { npubToHex, hexToNpub, parseJson } from '../../../utils'
 import styles from '../style.module.scss'
 import { SigitFile } from '../../../utils/file'
 
@@ -105,7 +105,7 @@ export const DisplayMeta = ({
   }, [signers, viewers])
 
   useEffect(() => {
-    const metadataController = new MetadataController()
+    const metadataController = MetadataController.getInstance()
 
     const hexKeys: string[] = [
       npubToHex(submittedBy)!,
@@ -167,20 +167,7 @@ export const DisplayMeta = ({
         <Typography variant="h6" sx={{ color: textColor }}>
           Submitted By
         </Typography>
-        {(function () {
+        <UserAvatar pubkey={submittedBy} isNameVisible={true} />
-          const profile = metadata[submittedBy]
-          return (
-            <UserAvatar
-              pubkey={submittedBy}
-              name={
-                profile?.display_name ||
-                profile?.name ||
-                shorten(hexToNpub(submittedBy))
-              }
-              image={profile?.picture}
-            />
-          )
-        })()}
       </ListItem>
       <ListItem
         sx={{
@@ -280,14 +267,12 @@ type DisplayUserProps = {
 const DisplayUser = ({
   meta,
   user,
-  metadata,
   signedBy,
   nextSigner,
   getPrevSignersSig
 }: DisplayUserProps) => {
   const theme = useTheme()
 
-  const userMeta = metadata[user.pubkey]
   const [userStatus, setUserStatus] = useState<UserStatus>(UserStatus.Pending)
   const [prevSignatureStatus, setPreviousSignatureStatus] =
     useState<PrevSignatureValidationEnum>(PrevSignatureValidationEnum.Pending)
@@ -370,15 +355,7 @@ const DisplayUser = ({
   return (
     <TableRow>
       <TableCell className={styles.tableCell}>
-        <UserAvatar
+        <UserAvatar pubkey={user.pubkey} isNameVisible={true} />
-          pubkey={user.pubkey}
-          name={
-            userMeta?.display_name ||
-            userMeta?.name ||
-            shorten(hexToNpub(user.pubkey))
-          }
-          image={userMeta?.picture}
-        />
       </TableCell>
       <TableCell className={styles.tableCell}>{user.role}</TableCell>
       <TableCell>

src/pages/verify/index.tsx

@@ -1,16 +1,11 @@
-import { Box, Button, Tooltip, Typography } from '@mui/material'
+import { Box, Button, Typography } from '@mui/material'
 import JSZip from 'jszip'
 import { MuiFileInput } from 'mui-file-input'
-import { Event, verifyEvent } from 'nostr-tools'
 import { useEffect, useRef, useState } from 'react'
 import { toast } from 'react-toastify'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
 import { NostrController } from '../../controllers'
-import {
+import { DocSignatureEvent, Meta } from '../../types'
-  CreateSignatureEventContent,
-  DocSignatureEvent,
-  Meta
-} from '../../types'
 import {
   decryptArrayBuffer,
   extractMarksFromSignedMeta,
@@ -20,7 +15,6 @@ import {
   parseJson,
   readContentOfZipEntry,
   signEventForMetaFile,
-  shorten,
   getCurrentUserFiles
 } from '../../utils'
 import styles from './style.module.scss'
@@ -42,9 +36,6 @@ import { Container } from '../../components/Container'
 import { useSigitMeta } from '../../hooks/useSigitMeta.tsx'
 import { StickySideColumns } from '../../layouts/StickySideColumns.tsx'
 import { UsersDetails } from '../../components/UsersDetails.tsx/index.tsx'
-import { UserAvatar } from '../../components/UserAvatar/index.tsx'
-import { useSigitProfiles } from '../../hooks/useSigitProfiles.tsx'
-import { TooltipChild } from '../../components/TooltipChild.tsx'
 import FileList from '../../components/FileList'
 import { CurrentUserFile } from '../../types/file.ts'
 import { Mark } from '../../types/mark.ts'
@@ -163,12 +154,26 @@ const SlimPdfView = ({
 
 export const VerifyPage = () => {
   const location = useLocation()
+  const usersPubkey = useSelector((state: State) => state.auth.usersPubkey)
+
+  const nostrController = NostrController.getInstance()
+
+  const [isLoading, setIsLoading] = useState(false)
+  const [loadingSpinnerDesc, setLoadingSpinnerDesc] = useState('')
+
   /**
    * uploadedZip will be received from home page when a user uploads a sigit zip wrapper that contains meta.json
    * meta will be received in navigation from create & home page in online mode
    */
-  const { uploadedZip, meta } = location.state || {}
+  const { uploadedZip, meta: metaInNavState } = location.state || {}
+  const [selectedFile, setSelectedFile] = useState<File | null>(null)
+  useEffect(() => {
+    if (uploadedZip) {
+      setSelectedFile(uploadedZip)
+    }
+  }, [uploadedZip])
 
+  const [meta, setMeta] = useState<Meta>(metaInNavState)
   const {
     submittedBy,
     zipUrl,
@@ -179,44 +184,22 @@ export const VerifyPage = () => {
     parsedSignatureEvents
   } = useSigitMeta(meta)
 
-  const profiles = useSigitProfiles([
+  const [files, setFiles] = useState<{ [filename: string]: SigitFile }>({})
-    ...(submittedBy ? [submittedBy] : []),
-    ...signers,
-    ...viewers
-  ])
-
-  const [isLoading, setIsLoading] = useState(false)
-  const [loadingSpinnerDesc, setLoadingSpinnerDesc] = useState('')
-
-  const [selectedFile, setSelectedFile] = useState<File | null>(null)
 
+  const [currentFile, setCurrentFile] = useState<CurrentUserFile | null>(null)
   const [currentFileHashes, setCurrentFileHashes] = useState<{
     [key: string]: string | null
   }>({})
-  const [files, setFiles] = useState<{ [filename: string]: SigitFile }>({})
-  const [currentFile, setCurrentFile] = useState<CurrentUserFile | null>(null)
-  const [signatureFileHashes, setSignatureFileHashes] = useState<{
-    [key: string]: string
-  }>(fileHashes)
-
-  useEffect(() => {
-    setSignatureFileHashes(fileHashes)
-  }, [fileHashes])
 
   useEffect(() => {
     if (Object.entries(files).length > 0) {
-      const tmp = getCurrentUserFiles(files, fileHashes, signatureFileHashes)
+      const tmp = getCurrentUserFiles(files, currentFileHashes, fileHashes)
       setCurrentFile(tmp[0])
     }
-  }, [signatureFileHashes, fileHashes, files])
+  }, [currentFileHashes, fileHashes, files])
-
-  const usersPubkey = useSelector((state: State) => state.auth.usersPubkey)
-  const nostrController = NostrController.getInstance()
 
   useEffect(() => {
-    if (uploadedZip) {
+    if (metaInNavState && encryptionKey) {
-      setSelectedFile(uploadedZip)
-    } else if (meta && encryptionKey) {
       const processSigit = async () => {
         setIsLoading(true)
 
@@ -301,7 +284,7 @@ export const VerifyPage = () => {
 
       processSigit()
     }
-  }, [encryptionKey, meta, uploadedZip, zipUrl])
+  }, [encryptionKey, metaInNavState, zipUrl])
 
   const handleVerify = async () => {
     if (!selectedFile) return
@@ -315,6 +298,7 @@ export const VerifyPage = () => {
 
     if (!zip) return
 
+    const files: { [filename: string]: SigitFile } = {}
     const fileHashes: { [key: string]: string | null } = {}
     const fileNames = Object.values(zip.files)
       .filter((entry) => entry.name.startsWith('files/') && !entry.dir)
@@ -322,24 +306,27 @@ export const VerifyPage = () => {
 
     // generate hashes for all entries in files folder of zipArchive
     // these hashes can be used to verify the originality of files
-    for (const fileName of fileNames) {
+    for (const zipFilePath of fileNames) {
       const arrayBuffer = await readContentOfZipEntry(
         zip,
-        fileName,
+        zipFilePath,
         'arraybuffer'
       )
 
+      const fileName = zipFilePath.replace(/^files\//, '')
       if (arrayBuffer) {
+        files[fileName] = await convertToSigitFile(arrayBuffer, fileName)
         const hash = await getHash(arrayBuffer)
 
         if (hash) {
-          fileHashes[fileName.replace(/^files\//, '')] = hash
+          fileHashes[fileName] = hash
         }
       } else {
-        fileHashes[fileName.replace(/^files\//, '')] = null
+        fileHashes[fileName] = null
       }
     }
 
+    setFiles(files)
     setCurrentFileHashes(fileHashes)
 
     setLoadingSpinnerDesc('Parsing meta.json')
@@ -368,43 +355,7 @@ export const VerifyPage = () => {
 
     if (!parsedMetaJson) return
 
-    const createSignatureEvent = await parseJson<Event>(
+    setMeta(parsedMetaJson)
-      parsedMetaJson.createSignature
-    ).catch((err) => {
-      console.log('err in parsing the createSignature event:>> ', err)
-      toast.error(
-        err.message || 'error occurred in parsing the create signature event'
-      )
-      setIsLoading(false)
-      return null
-    })
-
-    if (!createSignatureEvent) return
-
-    const isValidCreateSignature = verifyEvent(createSignatureEvent)
-
-    if (!isValidCreateSignature) {
-      toast.error('Create signature is invalid')
-      setIsLoading(false)
-      return
-    }
-
-    const createSignatureContent = await parseJson<CreateSignatureEventContent>(
-      createSignatureEvent.content
-    ).catch((err) => {
-      console.log(
-        `err in parsing the createSignature event's content :>> `,
-        err
-      )
-      toast.error(
-        err.message ||
-          `error occurred in parsing the create signature event's content`
-      )
-      setIsLoading(false)
-      return null
-    })
-
-    if (!createSignatureContent) return
 
     setIsLoading(false)
   }
@@ -479,47 +430,6 @@ export const VerifyPage = () => {
     setIsLoading(false)
   }
 
-  const displayExportedBy = () => {
-    if (!meta || !meta.exportSignature) return null
-
-    const exportSignatureString = meta.exportSignature
-
-    try {
-      const exportSignatureEvent = JSON.parse(exportSignatureString) as Event
-
-      if (verifyEvent(exportSignatureEvent)) {
-        const exportedBy = exportSignatureEvent.pubkey
-        const profile = profiles[exportedBy]
-        return (
-          <Tooltip
-            title={
-              profile?.display_name ||
-              profile?.name ||
-              shorten(hexToNpub(exportedBy))
-            }
-            placement="top"
-            arrow
-            disableInteractive
-          >
-            <TooltipChild>
-              <UserAvatar pubkey={exportedBy} image={profile?.picture} />
-            </TooltipChild>
-          </Tooltip>
-        )
-      } else {
-        toast.error(`Invalid export signature!`)
-        return (
-          <Typography component="label" sx={{ color: 'red' }}>
-            Invalid export signature
-          </Typography>
-        )
-      }
-    } catch (error) {
-      console.error(`An error occurred wile parsing exportSignature`, error)
-      return null
-    }
-  }
-
   return (
     <>
       {isLoading && <LoadingSpinner desc={loadingSpinnerDesc} />}
@@ -554,22 +464,19 @@ export const VerifyPage = () => {
         {meta && (
           <StickySideColumns
             left={
-              <>
+              currentFile !== null && (
-                {currentFile !== null && (
+                <FileList
-                  <FileList
+                  files={getCurrentUserFiles(
-                    files={getCurrentUserFiles(
+                    files,
-                      files,
+                    currentFileHashes,
-                      currentFileHashes,
+                    fileHashes
-                      signatureFileHashes
+                  )}
-                    )}
+                  currentFile={currentFile}
-                    currentFile={currentFile}
+                  setCurrentFile={setCurrentFile}
-                    setCurrentFile={setCurrentFile}
+                  handleDownload={handleExport}
-                    handleDownload={handleExport}
+                  downloadLabel="Download Sigit"
-                    downloadLabel="Download Sigit"
+                />
-                  />
+              )
-                )}
-                {displayExportedBy()}
-              </>
             }
             right={<UsersDetails meta={meta} />}
             leftIcon={faFileDownload}
@@ -578,11 +485,7 @@ export const VerifyPage = () => {
           >
             <SlimPdfView
               currentFile={currentFile}
-              files={getCurrentUserFiles(
+              files={getCurrentUserFiles(files, currentFileHashes, fileHashes)}
-                files,
-                currentFileHashes,
-                signatureFileHashes
-              )}
               parsedSignatureEvents={parsedSignatureEvents}
             />
           </StickySideColumns>

src/utils/dvm.ts

@@ -13,7 +13,7 @@ import { setRelayInfoAction } from '../store/actions'
 export const getNostrJoiningBlockNumber = async (
   hexKey: string
 ): Promise<NostrJoiningBlock | null> => {
-  const metadataController = new MetadataController()
+  const metadataController = MetadataController.getInstance()
 
   const relaySet = await metadataController.findRelayListMetadata(hexKey)
 

src/utils/nostr.ts

@@ -365,7 +365,7 @@ export const getUsersAppData = async (): Promise<UserAppData | null> => {
   // Check if relayMap is undefined in the Redux store
   if (!relayMap) {
     // If relayMap is not present, fetch relay list metadata
-    const metadataController = new MetadataController()
+    const metadataController = MetadataController.getInstance()
     const relaySet = await metadataController
       .findRelayListMetadata(usersPubkey)
       .catch((err) => {
@@ -835,7 +835,7 @@ const getUserAppDataFromBlossom = async (url: string, privateKey: string) => {
  */
 export const subscribeForSigits = async (pubkey: string) => {
   // Instantiate the MetadataController to retrieve relay list metadata
-  const metadataController = new MetadataController()
+  const metadataController = MetadataController.getInstance()
   const relaySet = await metadataController
     .findRelayListMetadata(pubkey)
     .catch((err) => {
@@ -939,7 +939,7 @@ export const sendNotification = async (receiver: string, meta: Meta) => {
   const wrappedEvent = createWrap(unsignedEvent, receiver)
 
   // Instantiate the MetadataController to retrieve relay list metadata
-  const metadataController = new MetadataController()
+  const metadataController = MetadataController.getInstance()
   const relaySet = await metadataController
     .findRelayListMetadata(receiver)
     .catch((err) => {