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

Practicality of Half-Aggregated Schnorr Signatures

There is an article called Half-Aggregation of BIP 340 signatures by Blockstream that claims that a set of valid Schnorr signatures can be aggregated into a valid half-aggregated Schnorr signature.

They see different use cases for this that can be seen in the motivation section they give. One of them is CISA but without interaction.

The problem is that the inverse of the signature does not hold as they say:

However, the inverse does not hold: given suitable valid triples, it is possible to construct an input array to Aggregate which contains invalid triples, but for which VerifyAggregate will accept the aggregate signature returned by Aggregate. If this is undesired, input triples should be verified individually before passing them to Aggregate.

Doesn't that property negate the usefulness of half-aggregated signatures in practice if anyway all the independent signatures are needed anyway to be sure that all signatures are correct?



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