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

Are there still possible scenarios for transaction replays from Bitcoin Cash or vice versa?

I have three questions with regard to replay protection.

Q1 => Some non-standard scripts (like x + 2 = 5) do not require signatures (so naturally no SIGHASH_FORKID) to spend the UTXOs. Are these UTXOs and transactions still prone to replays?

Q2 => I have read the documents from the inception of Bitcoin Cash and realized that the legacy transaction digest algorithm is not being used anymore. From my understanding, the 4-byte sighash type is appened at the rear of the digested transaction input (Both for SigVersion::BASE and SigVersion::WITNESS_V0) and if a unique sighash flag is used, the uint256 SignatureHash result would be completely different. The SignatureHash function in the src/script/interpreter.cpp file of Bitcoin Cash only allows BIP-143 digest algorithm when SIGHASH_FORKID is in use. What if Bitcoin Cash developers only enforced the use of SIGHASH_FORKID and embraced Segwit? Is a unique sighash flag not enough to prevent replays?

Q3 => If a unique sighash flag (SIGHASH_FORKID) is not enough to prevent replays, then is it because of the malleability issue on legacy transactions?



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