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

How to add a custom struct to PSBT and handle transaction fees with two parties using BIP-174?

I am working on a Bitcoin transaction where two parties are involved. The goal is to lock funds and create a custom struct in the transaction output. Here's how I intend to set it up:

First party provides the funds and initiates a Partially Signed Bitcoin Transaction (PSBT) using BIP-174. Second party will add a custom struct (possibly metadata or a specific output detail) to the PSBT without providing any funds. I'm wondering if the following is possible:

Can the second party add a custom struct (output or metadata) to the PSBT, while the first party is the only one providing funds? Who will be responsible for paying the transaction fees? Will the first party bear all the fees since they are providing the input funds, or is there a way to distribute this between the parties? Are there any known constraints or best practices for achieving this within Bitcoin's protocol and the PSBT standard? I would appreciate any guidance on whether this setup is feasible and how to handle fees and struct addition in a PSBT.



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