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

OP_CAT + OP_CHECKSIGFROMSTACK: how to prevent cross-UTXO signature reuse?

Following up on #130598.

I built a CAT + CSFS oracle-style script on signet (commit, reveal):

OP_CAT OP_SHA256 <oracle_pubkey> OP_CHECKSIGFROMSTACK

Witness: [sig, PART1, PART2] Message: SHA256(PART1 || PART2)

Since CSFS only checks the message, the same (sig, PART1, PART2) appears to be reusable across multiple UTXOs with compatible scripts.

For price oracles this is usually acceptable. But if the goal is single-use authorization (i.e., the signature should only be valid for one specific UTXO):

  • Is committing to the outpoint inside the message the only general approach?
  • Or is there a script-level pattern that avoids requiring the oracle to wait for the UTXO to exist before signing?


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