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

Is validity of a transaction binary from a light-node's point of view?

Transactions in Bitcoin network don't have the finality property -- it is never (theoretically) true that a transaction can't be reversed some time in the future. Thus whether a transaction was confirmed or not is not a binary property.

The validity of a transaction as far as full-nodes are concerned is binary. However, looking at the specification of how light-nodes verify transactions, they use the number of confirmations as a proxy for validity. Since validity in this case is a function of confirmations it appears that it has no finality either -- from the light-node's point of view it is never (theoretically) true that a transaction can't be invalidated some time in the future.

Is this correct? I know that there is a heuristic of 6 confirmations, but that is arbitrary.



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