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

Hello, everyone.Can a Bitcoin node build a partial UTXO set from only the most recent blocks and use it to validate new transactions?

I am investigating whether a storage-constrained Bitcoin node could retain only the most recent (N) blocks, construct a partial UTXO set from those blocks, and use that partial UTXO set to independently validate newly received transactions.

The basic idea would be:

recent (N) blocks → construct a partial UTXO set → validate a new transaction locally if all of its input UTXOs are available in that partial set.

However, I see a potential bootstrap problem.

Suppose the node starts with only the most recent (N) blocks. Some transactions in the earliest retained blocks may spend outputs created before the retained window. Without the earlier UTXO state, the node cannot fully validate those inputs.

If the node therefore cannot fully validate those blocks, can it safely treat the outputs created by those blocks as valid UTXOs and progressively construct a partial UTXO set from them?

More generally:

Is it technically feasible for a Bitcoin node to construct a trustworthy partial UTXO set using only the most recent (N) blocks, without first obtaining a validated UTXO state at the beginning of the retained window?

If all inputs of a newly received transaction are present in such a partial UTXO set, would that be sufficient for the node to independently validate that transaction, or would the incomplete validation history of the partial UTXO set prevent this?

How is this different from the way a Bitcoin wallet maintains information about its own UTXOs? A wallet does not maintain the complete global UTXO set, so what provides the trust basis for the wallet's view of its own unspent outputs?

If this approach is technically possible, why is recent-block-based partial UTXO construction not commonly used by lightweight Bitcoin nodes today? What are the main technical or security limitations?

I am particularly interested in the trust/validation issue rather than merely the storage savings.



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