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https://www.coindesk.com/markets/2023/01/19/bitcoin-bridged-to-avalanche-surpasses-btc-locked-in-lightning-network/

I remember when this project was "snowflake"
thought it would be great to get into, but couldn'f find the time.

never really got into lightning, because, it is not bitcoin

https://archive.ph/Yer0D

https://www.coindesk.com/learn/2021/02/17/what-is-a-flash-loan/

TLDR: It's a contract of contracts, one of which is an uncollaterized loan typically followed by a sequence of trades which all must occur atomically (in one transaction) on the blockchain.

More technical breakdown from aave, the leading choice for flash loans:
https://docs.aave.com/faq/

https://www.coindesk.com/policy/2024/12/09/el-salvador-to-change-bitcoin-law-as-part-of-new-imf-deal-financial-times

El Salvador was just told to knock their scamcoin bullshit off if they want jewbucks. They decided on jewbucks.