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

Why Does Bitcoinlib Need a Database Backend?

I am a noob in Bitcoin and trying to do some basic programming like implement a watch only wallet or initiating a transfer using the python bitcoinlib library.

From some reading of the documentation, it seems the library needs a back-end SQL database, although it creates the database transparently if needed.

So my question is, why? As in, I believed (correct me if I am wrong), all relevant transactions data since the genesis block are in the the Blockchain? And that is not really tabular/relational data suitable for a SQL interface? What's the role of the additional database?

Also, if I want to send sats, or get the balance of an XPUB, should not the library go query the main blockchain? Or does the SQL database acts as the data store? Why so?



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