DEV Community: Bello Bambo

Checkout TalknDo for the #devchallenge #weekendchallenge on the Solana track

Bello Bambo — Mon, 20 Jul 2026 10:46:03 +0000

DEV Weekend Challenge: Passion Edition Submission

Bello Bambo

Jul 12

I Built TalknDo over the Weekend

#devchallenge #weekendchallenge #solana #blockchain

4 min read

I Built TalknDo over the Weekend

Bello Bambo — Sun, 12 Jul 2026 10:46:58 +0000

This is a submission for Weekend Challenge: Passion Edition

What I Built

I love working out, yet I still find ways to skip it. That experience taught me that passion alone does not always lead to action, sometimes we need accountability and real consequences to follow through.
This inspired me to build TalknDo, a Solana-based accountability platform that turns personal goals into challenges you commit to overcoming. Users create a challenge, set a deadline, and stake SOL on completing it, giving them an extra push when motivation fades.

To activate a challenge, the user provides a title, description or supporting file, stake amount, and deadline, then signs a Solana transaction. Once the challenge is completed, the user uploads proof, reclaims the staked SOL, and receives a non-transferable NFT achievement badge minted with Metaplex Core. If the deadline is missed, the challenge
expires and the staked SOL is transferred to a charity escrow account, where only authorized treasury members can withdraw it for charitable causes.

Although TalknDo was inspired by my passion for fitness, it is built for everyone. It can be used to stay committed to studying, learning a new skill, completing a side project, pursuing a creative goal, or achieving anything else that matters. Whatever your passion, TalknDo helps you turn your intention into a challenge, your commitment into action, and your progress into an achievement.

Live Project: https://talkndo-fe.vercel.app

Demo

Video Demo For TalknDo

TalknDo.mp4 - Google Drive

drive.google.com

Code

Smart Contract Function to create a Challenge/Goal:

Smart Contract Function to complete a challenge:

Function to Expire an ended/uncompleted challenge:

Function to Withdraw Charity Funds:

Function to Give User Charity Funds Withdrawal Access:

Function to Remove a User From Charity Funds Withdrawal Access:

Frontend Required Imports to sign transactions on-chain:

IDL JSON file:

Deployed Program ID(Devnet):

Github (Smart Contract): https://github.com/bellobambo/talk-do
Github (Frontend): https://github.com/bellobambo/talkndo-fe

How I Built It

I built the TalknDo smart contract on Solana using Rust and the Anchor framework. The program is deployed with the Program ID (Solana Devnet): 9CLYHqqCBfDsuDrwooBbzV8FuvVzsZwadUCZ2NLWSURE, which identifies the contract on the Solana network.
I used Program Derived Addresses (PDAs) to create secure and deterministic accounts for challenges, program configuration, treasury members, and charity funds. Each challenge PDA is derived from the challenge seed, the creator’s wallet address, and a unique challenge ID.
I built the frontend with Next.js, React, TypeScript, Tailwind CSS, and Ant Design. Solana Wallet Adapter connects the user’s wallet, while Web3.js and the Anchor TypeScript client handle account addresses, transaction construction, signing, and submission.
The frontend imports the generated Anchor IDL, which describes the program’s instructions, accounts, arguments, and data structures. It uses the IDL, connected wallet, RPC connection, and Program ID to create an Anchor Program instance. This allows the frontend to call the Rust smart contract through methods such as initializeChallenge(), completeChallenge(), and expireChallenge().
When a user creates a challenge, the frontend uploads any supporting file to IPFS through Pinata and receives a metadata URI. It then converts the stake from SOL to lamports, converts the deadline to a Unix timestamp, derives the challenge PDA, and calls initializeChallenge(). The smart contract validates the title, deadline, metadata URI, and stake before transferring the SOL into the challenge PDA, which acts as an on-chain escrow account.
The frontend reads challenge accounts from the program and uses their on-chain status and deadlines to organize them into active, completed, and expired challenges.
To complete a challenge, the user uploads a PDF or image as proof. The frontend stores the file on IPFS, generates and uploads the NFT badge metadata, creates a new badge asset keypair, and calls completeChallenge(). The wallet signs the transaction before it is submitted to the Solana network.
The completeChallenge() instruction verifies that the challenge is active, the deadline has not passed, and the proof and badge URIs are valid. It then records the proof URI, returns the staked SOL to the creator, and updates the challenge status to completed.
After successful completion, the smart contract uses a Cross-Program Invocation to Metaplex Core to mint an NFT achievement badge. A permanent freeze delegate makes the badge non-transferable, allowing it to serve as permanent proof that the user completed the challenge.
If a user misses the deadline, the frontend can call expireChallenge(). The smart contract confirms that the challenge is overdue, changes its status to failed, and transfers the staked SOL from the challenge escrow to the charity escrow. Authorized treasury members can call
withdrawCharityFunds() to send funds from the charity account to a selected recipient. The contract validates their treasury membership, checks the available balance, and preserves the account’s minimum rent reserve.
I included account constraints, signer checks, deadline and status validation, checked arithmetic, custom errors, and PDA verification to improve the security and reliability of the program.
The smart contract emits events for challenge creation, proof submission, NFT badge issuance, challenge expiration, treasury membership changes, and charity withdrawals, helping the frontend track and display on-chain activity.

NFT Completion Badge & Badge Details:

Prize Categories

Best Use of Solana: TalknDo uses Solana for on-chain goal setting, SOL staking through PDA-based escrow accounts, proof-of-completion records, and charity fund management. Successful users also receive non-transferable NFT badges minted with Metaplex Core.

[Boost]

Bello Bambo — Thu, 25 Jun 2026 15:31:26 +0000

GitHub “Finish-Up-A-Thon” Challenge Submission

Bello Bambo

May 26

Revamped Proof for Finish-Up-A-Thon

#devchallenge #githubchallenge

2 min read

[Boost]

Bello Bambo — Tue, 26 May 2026 20:50:20 +0000

Gemma 4 Challenge: Build With Gemma 4 Submission

Bello Bambo

May 12

AnsaMe: Assessment practice platform for national exams in Nigerian, using Gemma 4.

#devchallenge #gemmachallenge #gemma

2 min read

Revamped Proof for Finish-Up-A-Thon

Bello Bambo — Tue, 26 May 2026 17:11:06 +0000

This is a submission for the GitHub Finish-Up-A-Thon Challenge

What I Built

My first commit on Proof started on July 28, 2025.
Proof is a decentralized learning management system on EduChain.
It solves the problem of unreliable or easily altered academic records by putting key learning actions like course enrollment, exam creation, submissions, and scores on-chain.

Proof means a lot to me because it reflects my interest in building real education tools and exploring blockchain architecture to make learning systems more transparent, trustworthy, and useful for students and tutors.

Initial Github Commit on Proof:

Most Recent Github Commit on Proof:

Live Project: https://edu-hacks-fe.vercel.app/
Github Repo: https://github.com/bellobambo/edu-hacks-fe

Demo

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The Comeback Story

I have always wanted to polish up this project for a while, but kept postponing it until the Finish-Up-A-Thon challenge came along, this opportunity pushed me to pick it back up.

Before, the core idea worked, but the user experience was not clear enough. Tutor and student flows were confusing, navigation was weak, role-
based actions were not well separated, and grading needed improvement.

I improved the frontend so tutors can create courses, create exams, upload or generate questions, and batch-manage questions. Students can now
enroll, take exams, view past questions, and use AI to get explanations after submitting.

On the smart contract side, I cleaned up the LMS contract, removed unused storage and exam timing logic, made mappings private, added safer
getters, stored student answers, a new function to get exam correction, restricted submissions to lecturers, and updated tests, deployment files, scripts, and the ABI, to name a few.

My Experience with GitHub Copilot

GitHub Copilot helped me move faster throughout the update. It helped in making fixes like removing the old exam start/duration flow, adding student answer correction logic, updating tests and deployment files, and verifying the contract. On the frontend, it helped me consume the new
contract functions, update role-based tutor/student flows, improve registration/navigation, and connect course, exam, enrollment, and question upload features.

Few Places I used Github Copilot:

Smart Contract Address

Before:

edu-chain-testnet.blockscout.com

After(Revamped) :

edu-chain-testnet.blockscout.com

Frontend

Before:

After(Revamped):

New Post

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AnsaMe: Assessment practice platform for national exams in Nigerian, using Gemma 4.

Bello Bambo — Tue, 12 May 2026 21:29:02 +0000

This is a submission for the Gemma 4 Challenge: Build with Gemma 4

What We Built

We built AnsaMe, It is an assessment platform powered by Gemma 4, built specifically for Nigerian students preparing for National Standard Exams e.g JAMB, WAEC, and NECO.

Many Nigerian secondary-school students revise with static past-question PDFs, limited explanations, and little personalization. AnsaMe helps students practise, get instant feedback, and improve step by step.

Usage:

Student Pick the exam type and class arm: Arts, Science, Commercial, Technical, General, or Electives.
Choose from related subjects, with core General subjects available across the class arms.
Let Gemma 4 AI model suggest relevant topics, or enter a custom topic.
Generate exam-style multiple-choice questions.
For WAEC and NECO Standard, 4 theory questions are included and answers can be by typing, uploading a photo of written work, or both.
Submit answers and immediately see correct and incorrect choices.
Use AI explanations, theory feedback, and topic deep-dives to understand the weak areas.
Return to saved practice history for later revision.

Live Project

https://ansa-me.vercel.app

Demo

Project Demo Video:

Code

Github Repository:
AnsaMe Github Repo

How We Used Gemma 4

AnsaMe uses Gemma 4, dense 31B modal in four main scenarios:

Topic suggestions for a selected exam and subject
Structured 20-question practice-session generation
WAEC and NECO theory-question generation
Theory-answer marking from typed responses and uploaded images
Simple explanations for missed or reviewed answers
Topic deep-dives that summarize key ideas, common mistakes, and revision tips

Google AI Studio Dashboard:

Twitter Post

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Youtube Post

Team Submissions

Teammate : designedbybanke

Solana Development CheatSheet

Bello Bambo — Thu, 11 Sep 2025 16:44:51 +0000

https://github.com/bellobambo/SolCheatSheet

Kindly Star the Report🤍

Frontend Office Challenge Submission — Axero

Bello Bambo — Tue, 15 Jul 2025 13:26:45 +0000

This is a submission for Frontend Challenge: Office Edition sponsored by Axero, Holistic Webdev: Office Space

What I Built

I built an office software that comprises of an Office dashboard 🏣 with various Components like the Announcement Widget,
Upcoming events, Employee Spotlight, Company Resources Widget a water cooler chat and basically everything a modern Office software needs.
And in the Sidebar we have the Essential Modules we can Navigate to Such as the Calendar 🗓 to show upcoming Events and Date, Organization Team(Employees)👨🏽‍💼, Useful Company Documents📈 and much more

Demo

Project Demo 🔗 :
Youtube Demo

Live Link 🔗:
Live Project

Github Link 🔗:
Github Link

Journey

The Journey Throughout this project was Exciting 🥳 , i encountered some issues but found a way to resolve it, i found a way to improve and add more user friendly functionality along the journey and i am proud i have the live project up and running

Checkout my Storyblok Headless CMS submission 🪁🎊🚧🍥

Bello Bambo — Mon, 30 Jun 2025 13:32:10 +0000

Bello Bambo

Jun 18 '25

Flyerblok. Storyblok Challenge Submission

#devchallenge #storyblokchallenge #webdev #api

1 min read

Flyerblok. Storyblok Challenge Submission

Bello Bambo — Wed, 18 Jun 2025 07:06:13 +0000

This is a submission for the Storyblok Challenge

What I Built

I Built a flyerblok where users can rob mind's together by sharing their thoughts, opinions and views. I used storyblock Api, Asset, and webhook for deployment triggering to achieve my final product

Demo

Storyblok Space:
https://app.storyblok.com/#/me/spaces/342788/dashboard

Code Repository:

Github Repo : https://github.com/bellobambo/flyerblok

Deployed Project :
https://flyerblok.vercel.app/

Demo Video or Screenshots

Demo Video:
https://youtu.be/dRdaoVWVk04?si=NEdBWVL_o48uzGNp

Tech Stack

Storyblok
Nextjs
Vercel

How I Used Storyblok

I used storyblok API for collecting uploaded stories and assets from users and I used Storyblok webhook to trigger deployment when I publish a story

Learnings and Takeaways

I learnt how to use Storyblok headless CMS API with Nextjs(basically with any tech stack cause it uses similar processes)

FOOTBALL PUNDIT FIXTURES

Bello Bambo — Wed, 11 Jun 2025 00:23:53 +0000

This is my submission for the Runner H "AI Agent Prompting" Challenge

⚡️ What I Built
I Used Runner H AI to help me get some of the Fixtures for the coming club world cup and schedule a reminder for me on matchday

⚡️ Demo
This is my Demo
Demo URL

⚡️ How I Used Runner H
I Used it for gathering the Fixtures Needed on for the club world cup and schedule a reminder on my google calendar

⚡️ Use Case & Impact
Used for Scheduling upcoming Fixtures/Events

⚡️ Social Love
X(Twitter) Post
Runner H. X post

Solo Submission : my DEV username bello_bambo_549a73d66df3b