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BWB Digital Assets — Stellar Submission

Products & Services

BWB Digital Assets is a regulated investment infrastructure and distribution platform operating in Brazil since 2023. It connects real estate issuers, qualified investors, and distribution partners through private offering administration, investor eligibility, allocation controls, investment processing, and commission reconciliation.

BWB has completed six offerings totaling more than R$12 million with zero defaults. The platform supports 19 registered institutional issuers, more than 50 qualified investors, and eight active distribution offices. Its commercial pipeline includes more than 50 additional distribution partners, over 1,000 potential real estate investment agents, and approximately US$800 million in real estate opportunities.

This project establishes Stellar as BWB's primary network rail through Privy, Abroad, Avenia, Circle CCTP, and DeFindex. BWB's Convex backend will operate as the orchestration and control plane, applying compliance gates, preparing unsigned XDR transaction envelopes, indexing network state, and reconciling provider and ledger events. Stellar and Soroban will operate as the immutable execution layer for investor and developer wallets, regulated debt and equity positions, distribution, commissions, settlement, and segregated yield strategies.

Why Stellar

Stellar is expanding its role in institutional asset tokenization. DTC's tokenization service plans to connect to Stellar, with eligible DTC-tokenized assets expected on the network in the first half of 2027. DTCC Case Study.

Stellar also provides the programmable infrastructure and Integration Track building blocks required for BWB's next product layer. The bidirectional Base–Stellar settlement corridor will combine Avenia's BRL/USDC conversion and Base settlement with Circle CCTP's native-USDC transport. DeFindex will provide the Soroban yield engine for approved strategies. Real estate and yield balances, disclosures, records, and performance will remain segregated.

Current Products and Services

BWB currently provides:

Private real estate offering administration.
Investor onboarding, qualification, and eligibility management.
Investment allocation and processing.
Issuer, investor, distributor, and operations dashboards.
Distribution management across offices and members.
Referral attribution and commission reconciliation.
Document and electronic signature workflows.
Investment, ownership, and income distribution records.

What This Project Adds

Embedded Stellar Wallets with Privy

Privy will provide embedded key management and non-custodial Stellar accounts for investors and developers inside the BWB application. The Convex control plane will prepare unsigned XDR envelopes; users will authorize transactions through Privy. Sponsored base reserves, trustlines, and fee-bump envelopes will support a low-friction experience without BWB receiving or storing private keys.

Regulated Private Offerings on Soroban

Soroban contracts will represent eligible debt and equity positions, enforce offering eligibility and allocation limits, and control pauses, cooling-off periods, cancellations, and refunds. Personal information and KYC/KYB documents will remain off-chain. Contracts will emit auditable events for issuance, allocations, investments, cancellations, refunds, settlement, and tokenized AUM reporting.

Distribution Attribution and Commissioning

Stellar transactions and Soroban events will feed BWB's attribution and commission ledgers. Confirmed investments will be associated with the correct offering, distributor, office, and member through deterministic, versioned rules. Private referral links will preserve attribution without exposing investor identities on-chain.

KYC/KYB and BRL Ramp with Abroad

Abroad will provide investor and business verification and BRL entry and exit flows. Verification states will control access to offerings and financial products. BWB will coordinate eligibility, authorization, transaction status, and reconciliation without receiving investor funds.

The integration will cover authenticated callbacks, idempotency, failed transactions, retries, refunds, and reconciliation between BRL operations and their final Stellar state.

Bidirectional Base–Stellar Settlement Corridor

Avenia will support BRL/USDC conversion and Base settlement, while Circle CCTP will provide native-USDC transport between Base and Stellar through user-authorized burn, attestation, mint, and forwarding flows. A durable transfer identifier and append-only reconciliation record will join each quote, Avenia ticket, Base transaction, CCTP message, Stellar transaction, and terminal wallet state without BWB taking custody of investor funds.

Capital arriving on Stellar can be allocated to regulated Soroban offerings or approved DeFindex strategies. Eligible redemptions, income, and withdrawn positions can follow the reverse route to Base and settle in BRL. Production activation will depend on official CCTP availability on Stellar Mainnet.

Technical references: Avenia Settlement API and CCTP on Stellar.

Yield Strategies with DeFindex

DeFindex will provide the vault and strategy integration layer. Eligible users will review strategy information, authorize deposits, monitor positions, and request withdrawals through BWB. An eligible operating partner will define and operate the applicable vault parameters.

Unified Stellar Investment Experience

A user will:

1.Access an embedded Stellar wallet through Privy.
2.Complete KYC/KYB through Abroad and receive product eligibility from verified compliance states.
3.Fund directly in BRL through Abroad or move eligible capital through the bidirectional Base–Stellar settlement corridor.
4.Invest in a Soroban-controlled private offering.
5.Access approved DeFindex yield strategies.
6.Authorize each transaction directly.
7.Track investments, income, yield positions, cross-chain transfers, and settlement status through BWB.
8.Return eligible USDC to Base through CCTP and, when requested, settle in BRL through Avenia.

Real estate investments and DeFindex yield positions will maintain separate balances, disclosures, records, and performance reporting.

Developers and issuers will connect Stellar wallets to configure approved offerings, receive verified issuance and allocation records, and monitor tokenized AUM without accessing investor personal data on-chain.

Reusable Infrastructure

The project will deliver reusable components for:

Privy-powered Stellar wallets.
Abroad verification and BRL ramp states.
Bidirectional Base–Stellar settlement corridor states spanning quote and intent, source settlement, CCTP transport, and terminal settlement.
Durable transfer identifiers and append-only reconciliation records across Avenia, Base, CCTP, and Stellar.
Soroban eligibility and allocation contracts.
Stellar event indexing and reconciliation.
Distribution attribution and commissions.
DeFindex vault operations.
Tokenized AUM and investor/developer wallet reporting from verified on-chain states.
Operational monitoring and evidence.

The baseline Stellar architecture, transaction flows, trust boundaries, and delivery mapping are available at Architecture.

Go-To-Market Plan

Target Audience

Global investors seeking exposure to Brazilian real estate development.
Brazilian investors building internationally diversified real estate portfolios.
Institutional investors seeking accessible opportunities tied to real estate development performance.

Channels

B2B2C: 16 partner investment firms, including real estate brokerages and independent financial advisors, with a combined reach of more than 200,000 individuals. Brognoli alone reaches approximately 150,000 clients.
B2C: More than 50 HNW and UHNW investors already onboarded and investing. This base has deployed R$10 million and has capacity for more than R$100 million without additional investors.
B2B: BWB's first international investor is onboarding for a product targeting a US$3 million allocation across three rounds. BWB has mapped 32 additional multi-family offices with a similar profile.

Strategic Partners and Pilots

Real estate pipeline: Approximately US$800 million in mapped opportunities.
Operational infrastructure: Live financial and operational stack with KYC/KYB/AML provider interfaces.
Legal and governance: In-house legal expertise supported by Bastos, Wackerhagen, Berns & Advogados Associados, independent accounting and financial auditors, and an investor board.
Developer network: More than 30 registered real estate developers and 22 projects in the 2026 pipeline, including developers in Brazil, Portugal, and the United States.

Success Criteria

US$4 million AUM of real estate assets tokenized with Stellar.
400 wallets total, combining investors and developers connected to the platform.
Investors acquiring at least two distinct debt or equity assets through BWB.

Requested Budget

Total Award Request: US$150,000 in XLM.

Delivery Capacity

BWB will allocate smart-contract, full-stack, backend, security/DevOps, product, and compliance capacity to the project. The wallet foundation and Soroban asset lifecycle layer will precede parallel identity, settlement corridor, yield product rail, distribution, and security workstreams in Tranche 2. Production hardening and Stellar Mainnet activation will follow in Tranche 3.

Traction Evidence

BWB Digital Assets has operated its regulated real estate investment platform since 2023. It has completed six offerings, raised more than R$12 million, and recorded zero defaults. Completed offerings include ARTP-HS at R$2.5 million, HAUS-06 at R$1.18 million, and ARTP-DT at R$1.5 million.

The platform has 19 registered institutional issuers and more than 50 qualified high-net-worth investors. The investor base has an average ticket of approximately US$50,000 and includes four prominent entrepreneurial families and one international multi-family office relationship.

BWB operates with eight active distribution offices within a broader network of 16 partner investment firms. Its pipeline includes more than 50 additional partners and over 1,000 potential real estate investment agents.

The company has structured an approximately US$800 million pipeline across greenfield development, income-generating properties, senior living, and logistics, with planned expansion into Portugal.

Onchain Analytics

Onchain Analytics — Public dashboard consolidating BWB's on-chain contracts, assets, holders, and transaction activity.

Deployed Offering Contracts

HAUS-06 Contract — Public contract and transaction history for the HAUS-06 offering.
ARTP-HS Contract — Public deployment, token, transfer, and transaction records for ARTP-HS.
ARTP-DT Contract — Public deployment and transaction activity for Artplaces Downtown.

Live Regulated Offerings

Algarve Home Offering — Presentation of the regulated MLLR-01 Algarve Home offering, available to eligible investors through BWB.
Ópera Apartments Offering — Presentation of the regulated Ópera Apartments offering, available to eligible investors through BWB.

External Coverage

Founders Interview — Interview covering BWB's origins, legal foundation, governance model, and investment thesis.
Company Profile — Editorial coverage of BWB's legal, technological, and investment model.

Stellar Distribution Readiness

The Stellar products will launch into an operating platform, investor base, issuer network, and distribution structure. Algarve Home and Ópera Apartments provide active environments for validating onboarding and distribution workflows before equivalent Stellar components enter production.

Deliverables Specification

Tranche #0: Grant Acceptance & Upfront Kickoff

Tranche Allocation: $15,000 USD — Disbursed Upfront

Milestone: Upfront grant disbursement executed by SCF upon proposal acceptance and administrative onboarding.


Tranche #1: MVP & Core Integration

Tranche Allocation: $30,000 USD


Deliverable 1: Embedded Stellar Wallet and Transaction Foundation
Description: Integration of Privy embedded key management and non-custodial Stellar accounts into the core application, enabling investor and developer account creation, user-authorized transaction signing, balance reporting, transaction history, trustline handling, and fee sponsorship workflows on testnet.
Scope of Work:
Embedded wallet integration supporting non-custodial multi-chain key generation with multi-factor authentication security.
Account creation, balance tracking, trustline configuration, and transaction history display in the user interface.
Convex transaction orchestration preparing unsigned XDR envelopes for user authorization, with duplicate-submission prevention, timeout handling, retry logic, and rejected-signature handling.
Sponsored base reserves and trustlines, plus fee-bump envelope workflows for network fees.
Integration testing, edge-case remediation, and bug resolution across wallet workflows.
Engineering Allocation: 160 Hours (Blended rate $75/h)
Fullstack Engineer: 73h
Backend Engineer: 40h
QA Engineer: 26h
Smart Contract Engineer: 21h
Budget Allocation: $12,000 USD
How to Measure Completion:
1.Authenticated investor and developer users can create or connect embedded Stellar wallets without private keys stored by the platform.
2.Core platform displays accurate Stellar asset balances and transaction history.
3.Trustline and reserve sponsorship flows complete successfully on testnet.
4.Duplicate submission prevention, timeout, retry, and signature rejection test suites pass.

Deliverable 2: Soroban Regulated Offering Asset Lifecycle Layer
Description: Implementation and testnet deployment of Soroban regulated offering contracts representing eligible debt and equity positions and enforcing private offering eligibility, investor allocation limits, pauses, cooling-off periods, cancellations, and refunds, with immutable execution states indexed by the Convex control plane.
Scope of Work:
Smart contract development for offering creation, tokenized debt and equity position records, investor eligibility verification, and per-investor and aggregate allocation limits.
Contract administrative controls for pausing, unpausing, cancellations, cooling-off periods, and automated refunds.
On-chain event emission for issuance, allocation, investment, and settlement states supporting tokenized AUM reporting while maintaining all investor personal data off-chain.
Automated test suite execution, boundary condition remediation, idempotency validation, and bug resolution.
Engineering Allocation: 240 Hours (Blended rate $75/h)
Smart Contract Engineer: 100h
Fullstack Engineer: 56h
Backend Engineer: 54h
QA Engineer: 30h
Budget Allocation: $18,000 USD
How to Measure Completion:
1.Offering contracts deployed on testnet with verified debt or equity position representation, eligibility, and allocation enforcement.
2.Pause, unpause, cancellation, cooling-off, and refund controls tested and operating as specified.
3.Issuance and allocation states produce reproducible tokenized AUM calculations without storing personally identifiable information on-chain.
4.Integration test suite passing for authorization, boundary, pause, refund, and idempotency scenarios.

Tranche #2: Testnet Expansion, Settlement Corridor & Partner Integrations

Tranche Allocation: $45,000 USD


Deliverable 3: Distribution Attribution and Commissioning Engine
Description: Integration of Stellar transactions and Soroban contract events into the existing distribution and commission ledgers, implementing deterministic attribution and versioned commission rules by offering, distribution office, and team member.
Scope of Work:
Referral link attribution tracking that preserves originating distributor offices and members without exposing investor identity on-chain.
Commission ledger calculation engine supporting approvals, reversals, cancellations, and refunds.
Distributor dashboards displaying invested value, units sold, and pending, earned, or reversed commissions.
Multi-office attribution validation, reconciliation testing, and defect remediation.
Engineering Allocation: 100 Hours (Blended rate $75/h)
Fullstack Engineer: 40h
Backend Engineer: 36h
QA Engineer: 14h
Smart Contract Engineer: 10h
Budget Allocation: $7,500 USD
How to Measure Completion:
1.Private referral links preserve originating distributor and office attribution.
2.Confirmed investments create single, idempotent commission ledger entries.
3.Dashboards display invested value, sold units, and pending, earned, or reversed commissions.
4.Simulated multi-office distribution scenario completes without duplicate attribution or commission entries.

Deliverable 4: Abroad KYC/KYB and BRL Ramp Testnet
Description: Integration of local payment and identity verification services for investor and business verification, alongside direct BRL entry and exit flows, reconciling fiat operations with final Stellar states.
Scope of Work:
Verification status processing supporting approved, rejected, expired, and manual review states to control platform access.
BRL bank transfer deposit and withdrawal flows with authenticated callback processing, double-entry reconciliation ledgers, and automated retry queues.
Reconciliation ledger matching fiat payment records with final Stellar transaction states.
Integration testing, failure handling for expired/rejected transactions, and defect resolution.
Engineering Allocation: 140 Hours (Blended rate $75/h)
Backend Engineer: 56h
Fullstack Engineer: 50h
QA Engineer: 22h
Smart Contract Engineer: 12h
Budget Allocation: $10,500 USD
How to Measure Completion:
1.Identity verification states control platform access to offerings and financial products.
2.BRL deposits and withdrawals reach reconciled terminal states in testnet environment.
3.Failed, expired, rejected, refunded, and retried transactions handled without losing state data.
4.Reconciliation record links BRL fiat transactions with final Stellar states without storing PII on-chain.

Deliverable 5: Bidirectional Base–Stellar Settlement Corridor
Description: Testnet implementation of a non-custodial settlement corridor connecting BWB's existing Base settlement stack to the Stellar execution rail. Avenia will provide BRL/USDC conversion and Base settlement, while Circle CCTP will transport native USDC bidirectionally between Base and Stellar.
Scope of Work:
Avenia quote, ticket, internal-balance, Base deposit, Base withdrawal, and BRL settlement adapters with authenticated webhook processing.
CCTP Base-to-Stellar and Stellar-to-Base flows covering burn submission, Circle attestation retrieval, message delivery, mint, and mandatory CctpForwarder routing for Stellar recipients.
Four-stage state machine covering quote and intent, source settlement, CCTP transport, and terminal settlement.
Durable transfer identifier and append-only reconciliation record joining Avenia tickets, Base transactions, CCTP domains, nonces, message hashes and attestations, Stellar transactions, and terminal wallet states.
Six-decimal USDC normalization, idempotency, quote expiration, timeout, retry, duplicate-message prevention, refund, and incomplete-transfer handling.
Engineering Allocation: 120 Hours (Blended rate $75/h)
Backend Engineer: 42h
Smart Contract Engineer: 30h
Fullstack Engineer: 28h
QA Engineer: 20h
Budget Allocation: $9,000 USD
How to Measure Completion:
1.Sandbox flow converts eligible BRL to USDC on Base and completes a reconciled CCTP transfer to a Stellar testnet wallet through CctpForwarder.
2.Reverse testnet flow returns USDC from Stellar to Base and reaches an eligible BRL settlement state through Avenia.
3.One durable transfer identifier and append-only record reconcile every quote, authorization, ticket, source transaction, CCTP message, attestation, destination transaction, and terminal wallet balance without BWB taking custody.
4.Precision, duplicate-message, expired-quote, timeout, retry, refund, and incomplete-transfer test suites pass.

Deliverable 6: DeFindex Soroban Yield Engine Testnet
Description: Integration of the DeFindex Soroban yield engine as a dedicated yield product rail separated from regulated real estate offerings, supporting user-authorized deposits, withdrawals, position accounting, performance reporting, and strategy-specific risk disclosure.
Scope of Work:
Non-custodial vault adapters preparing unsigned deposit and withdrawal XDR payloads for user authorization, plus balance reads, share accounting, and position-state reconciliation.
Strategy catalog displaying operator, underlying assets, fees, liquidity constraints, reported performance, and applicable risk disclosures.
Convex state synchronization and accounting layer reconciling vault shares, underlying value, deposits, withdrawals, and income snapshots independently from real estate assets.
Validation covering authorization, share conversion, stale data, paused vaults, withdrawal edge cases, failed transactions, and reconciliation.
Engineering Allocation: 120 Hours (Blended rate $75/h)
Fullstack Engineer: 44h
Smart Contract Engineer: 36h
Backend Engineer: 24h
QA Engineer: 16h
Budget Allocation: $9,000 USD
How to Measure Completion:
1.DeFindex vault deposits and withdrawals complete successfully on testnet with user-authorized signatures and reconciled position states.
2.Vault shares, underlying value, deposits, withdrawals, and income snapshots reconcile against verifiable on-chain states.
3.Application interface displays strategy terms, fees, liquidity constraints, performance, and risks separately from real estate assets.
4.Authorization, share conversion, stale-data, paused-vault, withdrawal, failure, and reconciliation test suites pass.

Deliverable 7: STRIDE Threat Model and On-Chain Monitoring Plan
Description: Development and testnet validation of a threat model and operational monitoring plan covering the Convex control plane, Stellar execution rail, Privy wallet boundary, Soroban asset lifecycle layer, Abroad ramp, Base–Stellar settlement corridor, event indexer, attribution, and DeFindex yield product rail.
Scope of Work:
System and data-flow model documenting external actors, controlled processes, data stores, sensitive flows, custody, provider and network trust boundaries, and the current inventory of monitored testnet contract and account addresses.
STRIDE threat register with unique identifiers, affected components, severity, treatment, and residual-risk decisions across privileged actions, investor authorization, callbacks, CCTP messages, attestations, contract state, and provider dependencies.
Traceable monitoring rules mapping each threat to observable on-chain effects, expected baselines, trigger conditions, and off-chain controls where exploitation cannot be detected on-chain.
Alert response matrix defining owner, channel, status, escalation, review cadence, address-change control, and guarded pause procedures for critical contract events.
Engineering Allocation: 120 Hours (Blended rate $75/h)
Security/DevOps Engineer: 46h
Smart Contract Engineer: 30h
Backend Engineer: 24h
QA Engineer: 20h
Budget Allocation: $9,000 USD
How to Measure Completion:
1.Reviewed data-flow model identifies system components, data stores, trust boundaries, external dependencies, and current testnet addresses.
2.STRIDE register covers all six threat categories with traceable IDs, severity, affected components, treatments, and residual-risk decisions.
3.Every registered threat has at least one tested monitor or a documented off-chain control, with baseline, trigger, address, and response ownership defined.
4.Testnet alert drills verify notification, escalation, critical pause handling, evidence capture, and the procedure for updating monitors after contract or address changes.

Tranche #3: Mainnet Launch & Production Readiness

Tranche Allocation: $60,000 USD


Deliverable 8: Mainnet Regulated Distribution Launch
Description: Production deployment and administrative initialization of the Stellar execution rail, including Soroban contracts, wallet integrations, state indexing, attribution, commissioning components, and approved monitoring controls connecting investor, issuer, distributor, and settlement journeys. The Base–Stellar settlement corridor will remain feature-gated until Circle publishes supported CCTP contracts for Stellar Mainnet.
Scope of Work:
Mainnet smart contract deployment and initialization of offering, whitelist, and distribution contracts.
Production activation of approved monitoring rules, critical alert channels, address inventory, and guarded emergency pause procedures defined in Deliverable 7.
Multi-office distributor configuration, investor and developer wallet onboarding, and live tokenized offering deployment.
Mainnet readiness validation for the Base–Stellar settlement corridor, with production activation only after Circle contract addresses, interfaces, CctpForwarder routing, limits, precision, monitoring, and bidirectional reconciliation are verified.
Operational monitoring, launch support, and rapid resolution of production edge cases or user friction points.
Engineering Allocation: 320 Hours (Blended rate $75/h)
Fullstack Engineer: 130h
Backend Engineer: 80h
Smart Contract Engineer: 60h
QA Engineer: 50h
Budget Allocation: $24,000 USD
How to Measure Completion:
1.Production smart contract addresses deployed and publicly verifiable on block explorer.
2.Live regulated real estate offering tokenized on Stellar Mainnet with active developer and distribution accounts.
3.Approved monitoring rules operate with active alert channels mapped to current production contract and wallet addresses.
4.Verified investor and developer wallet onboarding and real investment execution through settlement, attribution, and commission reconciliation.
5.The Base–Stellar settlement corridor remains disabled until supported CCTP Mainnet contracts and routing are verified; when available, both directions complete readiness, monitoring, precision, and reconciliation checks before activation.

Deliverable 9: Production Hardening and Operational Readiness
Description: System-wide operational hardening across the Convex control plane, provider adapters, and Stellar execution rail, validating transaction integrity and operational resilience under provider outages, timeout scenarios, duplicate events, conflicting states, and paused protocol states.
Scope of Work:
End-to-end integration test execution covering wallet, identity, direct BRL ramp, Avenia settlement, CCTP transfers, offerings, and DeFindex yield vaults.
Idempotency and state-reconciliation verification for duplicate callbacks, webhooks, Stellar network events, and interrupted multi-stage settlement flows.
Operational and program dashboard setup reporting success rates, transaction latency, reconciliation status, tokenized AUM, and investor/developer wallet counts without personal data.
Operational readiness checklist verification and defect remediation prior to general availability.
Engineering Allocation: 280 Hours (Blended rate $75/h)
Fullstack Engineer: 105h
Backend Engineer: 90h
QA Engineer: 55h
Smart Contract Engineer: 30h
Budget Allocation: $21,000 USD
How to Measure Completion:
1.Automated test suites pass across wallet, identity, BRL, Base–Stellar settlement corridor, regulated offering, and DeFindex yield product rail flows.
2.Idempotent processing verified for duplicate webhooks and Stellar network events.
3.State reconciliation detects and alerts on incomplete, conflicting, or non-terminal transaction states while preserving append-only operational evidence.
4.Dashboards actively report success, failure, latency, reconciliation, tokenized AUM, and investor/developer wallet metrics without personal data.

Deliverable 10: Open-Source Release and Final Verification
Description: Open-sourcing reusable Soroban smart contracts and provider-independent Stellar integration adapters, releasing technical documentation, and delivering the final evidence verification package.
Scope of Work:
Open-source repository packaging under an open license with automated continuous integration pipelines.
Developer documentation covering the Convex orchestration boundary, Stellar state indexing, unsigned XDR authorization, Privy wallets, Abroad ramps, the Base–Stellar settlement corridor, and DeFindex yield product rail patterns.
Final evidence package mapping all acceptance criteria to verifiable proof, block explorer links, test reports, and video demonstrations.
Developer guide review and open-source maintenance setup.
Engineering Allocation: 200 Hours (Blended rate $75/h)
Fullstack Engineer: 70h
Backend Engineer: 50h
Smart Contract Engineer: 45h
QA Engineer: 35h
Budget Allocation: $15,000 USD
How to Measure Completion:
1.Reusable smart contracts and integration adapters published under an OSI-approved license.
2.Documentation published covering Privy, Abroad, Avenia, CCTP, and DeFindex integration patterns.
3.Operational dashboard reporting tokenized real estate AUM, investor and developer wallets, investments, and transaction volume from verifiable Stellar states.
4.Final evidence package delivered mapping every deliverable criterion to reproducible proof.