Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &

Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &
Key item features Ultimate Security: Generates a private key that remains on the card, safeguarding crypto and NFTs from hackers with EAL6+ certification and audited firmware. Versatile Compatibility: Manages over 13,000 tokens across 70+ blockchains, supporting DeFi, NFTs, and DeEx without wires, Bluetooth, or USB. Effortless Operation: Utilizes NFC for secure transactions via a mobile device and the Tangem app, enabling buying and selling crypto with various payment methods. Smart Backup: Features a second Tangem Wallet as a backup, eliminating the need for paper, pictures, or seed phrases for recovery. Durable Design: Boasts IP68 protection against environmental conditions, ensuring longevity and robust physical security. Comprehensive Support: Compatible with Bitcoin, Ethereum, Solana, XRP, USDT, and over 6,000 cryptocurrencies, integrating with dApps and WalletConnect.

LBANK

LBANK

How Can ARK Protocol Ensure Trust and Accountability in Instant vTXO Issuance with Delayed On-Chain Transactions?

A Scenario Question: If Alice sends UTXOs to an ASP to issue vTXOs for Bob, the vTXO needs to be instantaneous, but the ASP’s on-chain transaction may take a long time to confirm. What happens if the on-chain transaction fails (with funds returning to the ASP)? In this case, could the ASP act maliciously by issuing the vTXO to Bob without backing it up, leaving Bob with unredeemable vTXOs when he tries to cash them out later?

Possible Solution: Could the ARK protocol ensure that the ASP only uses Alice's UTXOs after the on-chain transaction for Bob is successfully broadcast and confirmed? Additionally, can Bob's vTXOs indicate whether they are backed by UTXOs or not, notify him of any failure, and maintain a "Not Backed" status until the ASP backs it up with a new UTXO transaction? This would ensure that the ASP can only use Alice's funds after successfully creating a UTXO for Bob, with the entire process being publicly verifiable while respecting user privacy.



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