UPDATE For My friends

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Abstract
Bitsend introduces a new model for cryptocurrency transactions: an offline-first approach that allows wallets to operate without direct internet connectivity.
Transactions are signed locally, secured by private keys that never leave the user’s device, and then relayed through an indirect relay layer that connects to the blockchain.
Users receive confirmations back through the same resilient relay channel.
Future development includes the BSD Chain – a fully independent blockchain designed for offline-native operation.

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Motivation
Traditional cryptocurrencies rely entirely on internet connectivity.
This creates fragility in scenarios where the internet is censored, unavailable, or disrupted (e.g., natural disasters, conflict zones).
Bitsend addresses this gap by creating a system where essential wallet operations can continue without direct internet access.
The system ensures financial continuity and resilience.

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System Overview
The Bitsend ecosystem consists of three layers:

• Bitsend App – Generates addresses, signs transactions, manages balances offline.
• Relay Layer – An intermediate channel that forwards signed transactions and delivers confirmations.
• BSD Chain (Future) – A standalone blockchain designed for offline-native operation.

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Security Model

• Private keys never leave the device
• Transactions signed locally
• Replay protection and nonce management
• Confirmation receipts ensure verifiability even on weak networks

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Use Cases

• Disaster Recovery: Transactions possible even when infrastructure is down
• Censorship Resistance: Operates in hostile environments
• Developing Regions: Enables financial activity without internet
• Backup Layer: A parallel resilient economy complementing mainstream networks

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Comparison: External Blockchain vs BSD Chain

Criteria	External Blockchain	BSD Chain
Dependency	Relies on external miners & fees	Independent, own validators & rules
Transaction Cost	Variable, often high	Minimal, stable fee
Offline Resilience	None – requires internet	Offline-first with relay layer
Identity	Bitsend = app on Bitcoin	Bitsend = full Layer-1 ecosystem
Innovation	Common approach, crowded field	First offline-first blockchain

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Roadmap

• MVP (Today): Bitcoin relay proof-of-concept
• Testnet: BSD Chain with validators and faucet
• Mainnet: Fully independent BSD Chain with validator governance
• Ecosystem: SDKs, third-party integrations, offline-native apps