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

Mempool front-running of a Taproot hashlock spend

I built a Taproot address with a SHA256-hashlock leaf (OP_SHA256 <h> OP_EQUALVERIFY OP_TRUE, preimage "helloworld"). On mainnet I spent that leaf — the witness necessarily contains the preimage and the leaf script.

Within a few minutes, a different transaction spent the same UTXO to an unrelated address, paying a far higher fee, and confirmed instead of mine:

  • my spend: 44bb85269ffacd88903154e8e2af0d4963ba4022cc57e706b5819fd008e978d3 (replaced)
  • the replacement: 9fc1923c513cdf5a620ef88f61dbc3997e697cad0381b6f6c28827e4332dc363（link)

My understanding is that spending a hashlock reveals the preimage in the public mempool before confirmation, and under default full-RBF anyone can broadcast a higher-fee conflicting spend of the same output. Is this the correct explanation? Is automated "sweeping" of revealed-preimage / anyone-can-spend outputs a known, active phenomenon on mainnet, and is there any way to spend such an output without exposing it to this race (e.g., out-of-band submission)?



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