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

Estimating a PSBT’s virtual‐size before signing (accounting for post‐signature size increase)

I’m building a tool around Bitcoin Core’s PSBT API and need to estimate the final transaction virtual‐size (vsize) before I actually sign the PSBT. Once signed, each input’s witness data will be added, increasing the vsize—and thus the fee.

What I’m looking for A concise, correct recipe (or code snippet) to compute vsize of a PSBT before signing, including all varints and segwit overhead.

Any pitfalls or off‐by‐one mistakes people commonly make.

A reference to the relevant BIP or Bitcoin-Core source code that shows exactly how they calculate it internally.

Thanks in advance!



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