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

Was the OP_SUCCESSx reservation in BIP-342 designed with specific opcode families in mind, or as a generic forward-compatibility mechanism?

In Pieter Wuille's recent answer [Why did BIP-342 replace CHECKMULTISIG with a new opcode], BIP-342's deliberate minimization of semantic changes was attributed to the expectation that "those could always be introduced with later softforks that redefine OP_SUCCESSes."

I'm curious about the granularity of this reservation:

  • Were specific opcode candidates (e.g., CHECKSIGFROMSTACK, CAT, TXHASH) already on the radar when OP_SUCCESS positions were allocated, or was the allocation purely abstract — "reserve space for unknown future use"?
  • Was there discussion about classes of additions (introspection opcodes, signature variants, hash operations) that would or wouldn't be appropriate candidates for OP_SUCCESS redefinition vs. requiring a deeper softfork?
  • Are there design properties an opcode SHOULD have to be a clean OP_SUCCESS redefinition (vs. requiring more invasive consensus changes)?

I ask because the activation-path mechanics matter for how community discussions about future opcodes should be framed: is the conversation "which opcode" or also "which opcode reservation slot."



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