Share Encrypted Files with Blockchain Proof

BlockGram allows users to share sensitive files, media, and documents directly in Telegram chats with end-to-end encryption, while anchoring cryptographic proofs on-chain. This approach combines privacy, decentralization, and verifiability into a seamless file-sharing experience.

Secure and Seamless File Sharing

Traditional messaging apps offer limited security and verifiability for file sharing. BlockGram solves these challenges by providing:

• Fully encrypted, peer-to-peer file transfers
• On-chain anchoring of file metadata and hash signatures
• Verifiable proof of authorship, timestamp, and authenticity
• Optional permanent storage on decentralized networks

All of this happens directly in Telegram without requiring extra apps, wallets, or complex setups.

File Encryption and Access Control

Encryption Workflow

• Files are encrypted on the client device using AES-256 symmetric encryption
• A unique key is generated per file and wrapped with the recipient’s public key using RSA or elliptic curve encryption
• File chunks are transmitted via Telegram servers or optionally stored on decentralized networks like IPFS, Arweave, or Filecoin
• Recipients decrypt files locally using their private key

Access Control

• Only the intended recipient can access the file
• Optional expiration or revocation rights can be enforced via smart contracts

Storage Options

• Temporary in-chat delivery with encrypted payloads
• Long-term decentralized storage with on-chain hash anchoring

Blockchain-Verified Integrity

Every file shared generates a cryptographic hash that is recorded on-chain. This creates a decentralized certificate of authenticity, ensuring the file has not been tampered with and can be independently verified.

Advanced Use Cases

• Legal Documents: Contracts and agreements can be shared with immutable timestamping and verified recipients
• Enterprise Workflows: Encrypted reports with proof of delivery for compliance audits
• NFT-Backed Media: Restrict file access to NFT holders, proving ownership or usage rights
• Time-Locked Sharing: Smart contracts delay access or enforce download conditions

Technical Stack

• Client-side AES-256 encryption for files
• RSA or ECC encryption for key wrapping
• Decentralized storage via IPFS, Arweave, Filecoin
• On-chain hash anchoring for integrity verification
• Optional zk-SNARKs for future zero-knowledge access control

Security and Privacy Features

• End-to-end encryption ensures no intermediary can read files
• On-chain hash anchors detect tampering or replay attacks
• Metadata remains private, even with centralized storage
• Planned zero-knowledge proofs will allow verification without revealing file content or user identity

Benefits

• Eliminates dependence on cloud drives or third-party sharing tools
• Guarantees verifiable authenticity and authorship
• Preserves privacy while enabling trustless, auditable exchanges
• Enhances Telegram’s file-sharing with blockchain-level securityza