
Closed
Posted
Paid on delivery
I’m building a service that lets individual users hold and move TRON-based USDT without having to manage their own keys. What I need from you is the full custodial wallet backend—secure key management, on-chain monitoring, an internal ledger, and clean API endpoints that my future web or mobile front-end can call. Core flow • Generate a unique TRC20 deposit address for each user. • Detect incoming transfers quickly, credit the user balance in one block or less, and flag the transaction in a log I can audit. • On withdrawal, create, sign, and broadcast the TRON transaction within two seconds of approval while debiting the internal ledger atomically. Technical expectations • Use established TRON libraries such as TronWeb, gRPC, or similar; language choice is open as long as you justify it. • Store private keys encrypted—preferably through an HSM, AWS KMS, or a locally isolated signing module. • Provide a small admin panel or CLI that lets me freeze accounts, view balances, and manually trigger withdrawals if needed. • Include unit tests, straightforward deployment scripts (Docker on Ubuntu or an AWS equivalent), and concise but thorough documentation. Acceptance criteria 1. Deposit detection accuracy ≥ 99.9 %. 2. Balance consistency under concurrent deposits/withdrawals. 3. End-to-end demo works on Shasta testnet first, then mainnet. Deliverables • Source code repository with README and install instructions • Database schema & migration scripts • REST (or GraphQL) API specification • Deployment guide and test report If you’ve built custodial systems before—especially on TRON—let me know; it will speed up our review.
Project ID: 40477473
30 proposals
Remote project
Active 5 days ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
30 freelancers are bidding on average $695 USD for this job

Hi, I understand you need a TRON USDT custodial wallet backend where users get their own TRC20 deposit address, deposits are tracked fast, balances stay correct during busy activity, and withdrawals are signed and sent quickly after approval. I can build this with TronWeb/gRPC, PostgreSQL for the ledger, Redis/queues for safe processing, encrypted key storage using AWS KMS or an isolated signing service, plus REST APIs for your future app. I will also add an admin CLI/panel for freezing accounts, checking balances, and manual withdrawals. I’ll start on Shasta testnet, write unit tests for ledger and transaction flows, add Docker setup for Ubuntu/AWS, and provide API docs, migrations, deployment notes, and a test report. For a wallet system, I won’t treat private keys like sticky notes on a desk. Do you already have AWS KMS/HSM available, or should I set up the isolated signing module as part of this backend? Should deposits be credited after 1 block only, or do you also want a later status update after more confirmations? Do you prefer REST or GraphQL for the API, and is there any auth system already planned for your frontend? What withdrawal approval flow do you want: admin approval, automated rules, or both? Best regards,
$750 USD in 18 days
7.9
7.9

Hi — Elias here from Miami. I see you're developing a custodial wallet for TRON-based USDT, aiming to simplify user transactions. This is a crucial step in enhancing accessibility in the crypto space. The real technical challenge often lies in ensuring security and managing user permissions effectively. A common issue in systems like this is keeping transactions reliable while handling multiple user accounts. The tricky part is usually integrating blockchain functionalities seamlessly, ensuring that users can operate with confidence. My approach would focus on building a robust backend that prioritizes security and scalability. I would implement a layered architecture to ensure maintainability and future expansion. This way, we can accommodate growth without compromising performance. I've worked on similar blockchain applications, addressing concerns around security and user experience. This background allows me to foresee potential hurdles and mitigate risks early. A few questions to better understand the scope: Q1 – What user roles and permissions do you envision for this wallet? Q2 – Are there any specific compliance requirements you need to consider? Q3 – How do you plan to handle transaction notifications for users? Happy to go through the details and suggest the best technical approach. Looking forward to hearing from you.
$500 USD in 5 days
7.0
7.0

hi, we can definitely build this custodial tron usdt wallet system with secure key management, real time monitoring, and a reliable internal ledger. i will design a backend using tronweb with a secure signing service and encrypted key storage using aws kms or an isolated signing module. each user will get a unique trc20 deposit address and incoming transfers will be detected and credited quickly through a blockchain listener service. withdrawals will be processed through a safe queue system that signs and broadcasts transactions within seconds while keeping ledger updates atomic and consistent. i will also include an admin panel or cli for balance control, account freezing, and manual withdrawals. we will test everything first on shasta testnet before moving to mainnet, with full unit tests, docker setup, and clear documentation. let’s have a quick meeting to discuss architecture, security approach, and timeline. i will also share my portfolio during the chat. mughira
$500 USD in 7 days
5.2
5.2

HELLO!! I READ YOUR REQUIREMENTS CAREFULLY AND UNDERSTOOD VERY WELL ABOUT THE PROJECT SCOPE AND START WORKING ACCORDINGLY IN STAGES. I am a senior backend/blockchain developer with 10+ years of experience building secure fintech and crypto systems, including custodial wallet architecture, TRC20 integrations, and high-performance API services. For your TRON USDT custodial wallet, I will design and implement a secure backend system including TRC20 address generation per user, real-time on-chain monitoring, internal double-entry ledger, and atomic balance updates. I will use TronWeb/gRPC for blockchain interaction and implement encrypted key management using AWS KMS/HSM or isolated signing service for maximum security. The system will include fast deposit detection (block-level confirmation handling), withdrawal processing with signed and broadcasted transactions under strict approval flow, and a fully auditable transaction logging system. I will also build a lightweight admin panel/CLI for balance control, account freezing, and manual transaction overrides. Architecture will follow microservice-ready design with PostgreSQL ledger, Redis queue for transaction processing, Docker deployment, unit tests, and full API documentation. Shasta testnet will be used for validation before mainnet deployment. I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE, I eagerly await your positive response. Thanks. Christina
$500 USD in 7 days
4.7
4.7

Hello! I am a Florida-based senior software engineer with extensive experience in blockchain technologies, having worked for about 15 years in various software engineering roles. I carefully read your project description about building a TRON USDT custodial wallet and believe my skills align perfectly with your requirements. To better understand the project and ensure I can deliver the best results, could you please clarify the following questions? 1. What specific features or functionalities are you looking to include in the wallet? 2. Do you have any preferred security protocols or compliance standards that need to be followed? I have successfully developed several blockchain-related applications and have a solid understanding of cryptocurrency wallets. My approach includes defining clear milestones, focusing on security and user experience, and providing ongoing support after deployment. I am committed to delivering a solution that not only meets your needs but also ensures a seamless experience for users. Let’s connect to discuss how I can help bring your vision to life! Looking forward to your response. -James
$500 USD in 5 days
3.2
3.2

Hey there, I'm Vishal Maharaj, a Blockchain and Cryptocurrency expert with 25 years of experience based in Perth, Australia. I'm excited about the TRON USDT Custodial Wallet project you've outlined. I would approach this project by utilizing established TRON libraries like TronWeb, ensuring secure key management through encryption, and providing a user-friendly admin panel for easy management. Let's discuss further details and kickstart this project. Cheers, Vishal Maharaj
$500 USD in 5 days
0.0
0.0

Hi, I’m Everett, with extensive experience in blockchain backend development and secure wallet systems. Your goal to build a fully custodial TRON USDT wallet backend with secure key management, real-time deposit detection, and fast withdrawal processing is clear. I will implement it using TronWeb for TRON interactions, encrypt private keys with AWS KMS for security, and maintain balance consistency with atomic ledger transactions. The backend will expose clean REST APIs, and I'll provide an admin panel for controls. I can communicate in your time zone and deliver a working demo on the Shasta testnet within 12 hours of starting. Q1: What is your preferred programming language for this project? Q2: Would you prefer REST or GraphQL API? Q3: Are there specific user volume or concurrency expectations we should accommodate? What is your preferred programming language for the backend implementation? Best regards, Everett
$250 USD in 18 days
0.0
0.0

Hello, Your project is a strong match for my experience in blockchain backend development, custodial wallet systems, secure transaction processing, API design, and cloud-based infrastructure. I have worked on cryptocurrency platforms involving wallet management, blockchain monitoring, transaction automation, secure key storage, internal ledger systems, REST APIs, Docker deployments, and high-availability backend services. My focus is always on security, consistency, auditability, and reliable transaction processing. For your TRON USDT custodial platform, I can build a secure backend that generates unique TRC20 deposit addresses, monitors incoming transactions in real time, maintains an atomic internal ledger, processes withdrawals safely, and integrates encrypted key management through AWS KMS, HSM solutions, or an isolated signing service. I can also provide an admin panel or CLI for operational controls, monitoring, and manual approvals. My approach is to first build and validate the complete flow on Shasta testnet, perform concurrency and security testing, and then prepare the system for mainnet deployment with comprehensive documentation, deployment scripts, API specifications, and test coverage. I look forward to discussing your requirements further. Best regards, Daniel
$500 USD in 7 days
0.0
0.0

Hi, This is Jorge from IT GLOBAL SOLUTION LLC, based in the U.S. I can help build the TRON USDT custodial wallet backend with secure deposit address generation, TRC20 transaction monitoring, internal ledger accounting, withdrawal processing, admin controls, API endpoints, Docker deployment, and documentation. For this project, I would recommend a backend architecture using Node.js with TronWeb or Python with a reliable TRON integration layer, depending on your preferred environment. The system would include unique TRC20 deposit addresses per user, fast deposit detection on Shasta testnet first, transaction logs for auditability, and a ledger-first balance model so deposits, withdrawals, holds, freezes, and failed transactions are tracked consistently. For withdrawals, I would structure the flow with approval validation, atomic ledger debit, transaction creation/signing, broadcast, and status monitoring. Key management would be designed carefully using encrypted private key storage, KMS/HSM-style signing where available, or a separate isolated signing module so the API server does not casually expose private keys. I can also include role-based admin actions such as freeze account, view balances, review transaction history, and manually trigger or retry withdrawals. Let’s connect and review your expected user flow, security requirements, and hosting environment. Best, Jorge
$500 USD in 7 days
0.0
0.0

As a developer with a deep understanding and experience in the Blockchain and Crypto Currency space, I am confident that I can deliver an exceptional TRON USDT Custodial Wallet for your project. Over the span of 15+ years, my team and I have accumulated a wide range of skills including Python Scraping and Automation Development, Stock Trading Software expertise, cryptographic knowledge, as well as ASP.NET and Android development. This amalgamation of skills makes us uniquely qualified to build the kind of secure, scalable and feature-rich wallet backend you are looking for. Specifically on Blockchain, we have impressive records in creating robust custodial systems that it doesn’t matter what technical challenge you throw at me – be it generating unique deposit addresses in one block or less, monitoring on-chain transfers swiftly or dealing with high-concurrency withdrawals – we’ve got you covered. We're well-versed in using popular TRON libraries such as TronWeb, gRPC or similar API endpoints justify thereby giving us a solid foundation for your project. Our system uses encrypted private keys - preferably via HSM (Hardware Security Module), AWS KMS (Key Management Service), or isolated signing tools - to ensure your users' assets are well protected throughout all transactions processes. Additionally, with an admin panel we create قan freeze accounts if needed, view balances ,as well manually trigger withdrawals thereby putting you in full control of your system.
$700 USD in 7 days
0.0
0.0

Hi, I reviewed your project details and understand that the main focus is building a reliable custodial backend for TRON USDT with secure key handling, fast deposit detection, accurate balance management, and stable withdrawal processing. I can help develop the wallet infrastructure with TRC20 address generation, blockchain monitoring, internal ledger logic, encrypted key storage, transaction signing, and API endpoints prepared for future web or mobile integration. I also understand the importance of concurrency handling, audit logging, deployment automation, and keeping the architecture secure and scalable from the beginning. The Shasta-to-mainnet deployment flow, admin controls, Docker setup, and documentation requirements are all clear, and I’d be happy to discuss the technical approach, architecture, and timeline further. Thanks
$250 USD in 7 days
0.0
0.0

Hi, I can help build a secure custodial TRON USDT wallet backend with deposit address generation, on-chain monitoring, encrypted signing, internal ledger logic, and clean API endpoints for your future web or mobile app. I have experience with blockchain backends, wallet infrastructure, transaction monitoring, API design, Docker deployment, and secure balance systems. For this project, I would recommend a Node.js or Python backend using TronWeb or gRPC, PostgreSQL for the internal ledger, Redis or queues for transaction processing, and AWS KMS or an isolated signing service for private key protection. The system would include unique TRC20 deposit addresses, fast deposit detection, auditable transaction logs, atomic withdrawal ledger updates, signed broadcast flow, admin tools for freezes and manual review, Shasta testnet validation, and mainnet deployment preparation. I would also provide database migrations, API documentation, unit tests, deployment scripts, and a clear security-focused README. Best, Justin
$500 USD in 7 days
3.4
3.4

Hi, I’ve built secure crypto wallet backends with deposit address generation, blockchain monitoring, internal ledgers, withdrawal approval flows, transaction signing, audit logs, and admin controls. I’ve also worked on similar custodial systems where private keys were encrypted with KMS style controls, deposits were reconciled against an internal balance ledger, and withdrawals were handled atomically to prevent double spending or balance mismatches. For your TRON USDT backend, I can build a Shasta first custodial wallet service using TronWeb or gRPC, with unique TRC20 deposit addresses, fast transfer detection, encrypted key storage, ledger based balance management, withdrawal signing and broadcasting, account freeze controls, admin CLI or panel, Docker deployment, migrations, REST API documentation, unit tests, and a test report. I’ll focus heavily on concurrency safety, auditability, and clean separation between wallet operations, ledger logic, and signing. Best regards, George
$500 USD in 7 days
0.0
0.0

Hi there, I'm Cora May, and I can build the full custodial TRON USDT (TRC20) wallet backend you described: per-user deposit address generation, fast on-chain monitoring, an auditable transaction log, and a concurrency-safe internal ledger for balances. I’ve implemented wallet services where accuracy, reconciliation, and atomic debits/credits are critical, and I’ll mirror that with strict idempotency, block/confirmation handling for ≥99.9% deposit detection accuracy, and balance consistency under concurrent activity. For withdrawals, I’ll create, sign, and broadcast TRON transactions via TronWeb (optionally using gRPC for node access) while debiting your internal ledger atomically, aiming for approval-to-broadcast in ~2 seconds. Private keys will be stored encrypted with an isolated signing approach (HSM/KMS-ready design), plus operational safeguards and replay protection. You’ll get clean REST APIs for deposits, balances, withdrawals, and admin controls to freeze accounts and trigger manual withdrawals, along with unit tests, Dockerized Ubuntu deployment scripts, and thorough documentation.
$555 USD in 2 days
0.0
0.0

Hello, I can build the TRON USDT custodial wallet backend with TronWeb, Node.js, PostgreSQL, Docker, encrypted key management, on-chain monitoring, and REST APIs. I have experience building secure backend systems, API workflows, internal ledgers, transaction logging, and production-grade automation. For this project, I’d use Node.js with TronWeb because it is mature for TRON/TRC20 operations and works well for fast signing, broadcasting, and wallet monitoring. I’ll design the system with unique deposit addresses per user, encrypted private keys using AWS KMS or an isolated signing module, a double-entry internal ledger, atomic withdrawal handling, audit logs, and admin controls to freeze accounts, view balances, and trigger manual withdrawals. Deposits can be tested first on Shasta, then switched to mainnet after validation. I’ll also include database migrations, API docs, Docker deployment scripts, unit tests, and a test report covering concurrency, deposit detection, and withdrawal flow. I am ready to start and can work closely on the security architecture from day one. Best, Smit
$250 USD in 5 days
0.0
0.0

Hello! I have strong experience with backend architecture for high-integrity financial and transaction-heavy systems, where auditability, atomic balance handling, and operational safety matter as much as raw functionality. For a project in this area, I would focus on designing a robust service boundary, clear ledger logic, reliable on-chain event monitoring, secure deployment practices, and maintainable APIs that a future web or mobile client can consume cleanly. I’m particularly comfortable with systems that require precise state transitions, concurrency safety, transaction logging, and production-grade observability. I can help review the architecture, define the service interfaces, strengthen operational controls, and document a deployment and testing approach that gives you a much safer foundation for later implementation by the appropriate internal or licensed team.
$500 USD in 7 days
0.0
0.0

United Kingdom
Payment method verified
Member since Oct 19, 2025
$10-30 USD
$50 USD
$10-30 USD
£20 GBP
$20 USD
$5000-10000 AUD
$250-750 USD
$10-30 USD
₹1500-12500 INR
$750-1500 AUD
$25-50 USD / hour
$25-50 USD / hour
₹37500-75000 INR
₹150000-250000 INR
€30-250 EUR
$3000-5000 USD
$5000-10000 AUD
$3000-5000 USD
$250-750 AUD
€12-18 EUR / hour
$250-750 SGD
$2-8 USD / hour
₹600-1500 INR
₹150000-250000 INR
$30-250 USD