src/controllers/MetadataController.ts

@@ -5,11 +5,15 @@ import {
   kinds,
   validateEvent,
   verifyEvent,
-  Event
+  Event,
+  EventTemplate,
+  nip19
 } from 'nostr-tools'
-import { ProfileMetadata, RelaySet } from '../types'
+import { NostrJoiningBlock, ProfileMetadata, RelaySet } from '../types'
 import { NostrController } from '.'
 import { toast } from 'react-toastify'
+import { queryNip05 } from '../utils'
+import NDK, { NDKEvent, NDKSubscription } from '@nostr-dev-kit/ndk'
 
 export class MetadataController {
   private nostrController: NostrController
@@ -163,5 +167,130 @@ export class MetadataController {
       })
   }
 
+  public getNostrJoiningBlockNumber = async (
+    hexKey: string
+  ): Promise<NostrJoiningBlock | null> => {
+    const relaySet = await this.findRelayListMetadata(hexKey)
+
+    const userRelays: string[] = []
+
+    // find user's relays
+    if (relaySet.write.length > 0) {
+      userRelays.push(...relaySet.write)
+    } else {
+      const metadata = await this.findMetadata(hexKey)
+      const metadataContent = this.extractProfileMetadataContent(metadata)
+
+      if (metadataContent?.nip05) {
+        const nip05Profile = await queryNip05(metadataContent.nip05)
+
+        if (nip05Profile && nip05Profile.pubkey === hexKey) {
+          userRelays.push(...nip05Profile.relays)
+        }
+      }
+    }
+
+    if (userRelays.length === 0) return null
+
+    // filter for finding user's first kind 1 event
+    const eventFilter: Filter = {
+      kinds: [kinds.ShortTextNote],
+      authors: [hexKey]
+    }
+
+    const pool = new SimplePool()
+
+    // find user's kind 1 events published on user's relays
+    const events = await pool.querySync(userRelays, eventFilter)
+    if (events && events.length) {
+      // sort events by created_at time in ascending order
+      events.sort((a, b) => a.created_at - b.created_at)
+
+      // get first ever event published on user's relays
+      const event = events[0]
+      const { created_at } = event
+
+      // initialize job request
+      const jobEventTemplate: EventTemplate = {
+        content: '',
+        created_at: Math.round(Date.now() / 1000),
+        kind: 68001,
+        tags: [
+          ['i', `${created_at * 1000}`],
+          ['j', 'blockChain-block-number']
+        ]
+      }
+
+      // sign job request event
+      const jobSignedEvent = await this.nostrController.signEvent(
+        jobEventTemplate
+      )
+
+      const relays = [
+        'wss://relay.damus.io',
+        'wss://relay.primal.net',
+        'wss://relayable.org'
+      ]
+
+      // publish job request
+      await this.nostrController.publishEvent(jobSignedEvent, relays)
+
+      console.log('jobSignedEvent :>> ', jobSignedEvent)
+
+      const subscribeWithTimeout = (
+        subscription: NDKSubscription,
+        timeoutMs: number
+      ): Promise<string> => {
+        return new Promise((resolve, reject) => {
+          const eventHandler = (event: NDKEvent) => {
+            subscription.stop()
+            resolve(event.content)
+          }
+
+          subscription.on('event', eventHandler)
+
+          // Set up a timeout to stop the subscription after a specified time
+          const timeout = setTimeout(() => {
+            subscription.stop() // Stop the subscription
+            reject(new Error('Subscription timed out')) // Reject the promise with a timeout error
+          }, timeoutMs)
+
+          // Handle subscription close event
+          subscription.on('close', () => clearTimeout(timeout))
+        })
+      }
+
+      const dvmNDK = new NDK({
+        explicitRelayUrls: relays
+      })
+
+      await dvmNDK.connect(2000)
+
+      // filter for getting DVM job's result
+      const sub = dvmNDK.subscribe({
+        kinds: [68002 as number],
+        '#e': [jobSignedEvent.id],
+        '#p': [jobSignedEvent.pubkey]
+      })
+
+      // asynchronously get block number from dvm job with 20 seconds timeout
+      const dvmJobResult = await subscribeWithTimeout(sub, 20000)
+
+      const encodedEventPointer = nip19.neventEncode({
+        id: event.id,
+        relays: userRelays,
+        author: event.pubkey,
+        kind: event.kind
+      })
+
+      return {
+        block: parseInt(dvmJobResult),
+        encodedEventPointer
+      }
+    }
+
+    return null
+  }
+
   public validate = (event: Event) => validateEvent(event) && verifyEvent(event)
 }

src/pages/profile/index.tsx

@@ -1,12 +1,19 @@
 import ContentCopyIcon from '@mui/icons-material/ContentCopy'
-import { List, ListItem, ListSubheader, TextField } from '@mui/material'
+import {
+  List,
+  ListItem,
+  ListSubheader,
+  TextField,
+  Typography,
+  useTheme
+} from '@mui/material'
 import { UnsignedEvent, nip19, kinds, VerifiedEvent } from 'nostr-tools'
 import { useEffect, useMemo, useState } from 'react'
-import { useParams } from 'react-router-dom'
+import { Link, useParams } from 'react-router-dom'
 import { toast } from 'react-toastify'
 import placeholderAvatar from '../../assets/images/nostr-logo.jpg'
 import { MetadataController, NostrController } from '../../controllers'
-import { ProfileMetadata } from '../../types'
+import { NostrJoiningBlock, ProfileMetadata } from '../../types'
 import styles from './style.module.scss'
 import { useDispatch, useSelector } from 'react-redux'
 import { State } from '../../store/rootReducer'
@@ -17,6 +24,8 @@ import { LoadingSpinner } from '../../components/LoadingSpinner'
 import { LoginMethods } from '../../store/auth/types'
 
 export const ProfilePage = () => {
+  const theme = useTheme()
+
   const { npub } = useParams()
 
   const dispatch: Dispatch = useDispatch()
@@ -25,6 +34,8 @@ export const ProfilePage = () => {
   const nostrController = NostrController.getInstance()
 
   const [pubkey, setPubkey] = useState<string>()
+  const [nostrJoiningBlock, setNostrJoiningBlock] =
+    useState<NostrJoiningBlock | null>(null)
   const [profileMetadata, setProfileMetadata] = useState<ProfileMetadata>()
   const [savingProfileMetadata, setSavingProfileMetadata] = useState(false)
   const metadataState = useSelector((state: State) => state.metadata)
@@ -50,6 +61,18 @@ export const ProfilePage = () => {
   }, [npub, usersPubkey])
 
   useEffect(() => {
+    if (pubkey) {
+      metadataController
+        .getNostrJoiningBlockNumber(pubkey)
+        .then((res) => {
+          setNostrJoiningBlock(res)
+        })
+        .catch((err) => {
+          // todo: handle error
+          console.log('err :>> ', err)
+        })
+    }
+
     if (isUsersOwnProfile && metadataState) {
       const metadataContent = metadataController.extractProfileMetadataContent(
         metadataState as VerifiedEvent
@@ -206,8 +229,7 @@ export const ProfilePage = () => {
                 sx={{
                   marginTop: 1,
                   display: 'flex',
-                  flexDirection: 'column',
-                  gap: 2
+                  flexDirection: 'column'
                 }}
               >
                 <img
@@ -218,6 +240,20 @@ export const ProfilePage = () => {
                   src={profileMetadata.picture || placeholderAvatar}
                   alt='Profile Image'
                 />
+                {nostrJoiningBlock && (
+                  <Typography
+                    sx={{
+                      color: theme.palette.getContrastText(
+                        theme.palette.background.paper
+                      )
+                    }}
+                    component={Link}
+                    to={`https://njump.me/${nostrJoiningBlock.encodedEventPointer}`}
+                    target='_blank'
+                  >
+                    On nostr since {nostrJoiningBlock.block.toLocaleString()}
+                  </Typography>
+                )}
               </ListItem>
 
               {editItem('name', 'Username')}

src/types/nostr.ts

@@ -12,3 +12,8 @@ export interface RelaySet {
   read: string[]
   write: string[]
 }
+
+export interface NostrJoiningBlock {
+  block: number
+  encodedEventPointer: string
+}