In addition Sovryn provides FastBTC, a quick, custodial solution for sending BTC from Bitcoin to Rootstock and back.

When I swap bitcoin ($BTC) with Liquid ($L-BTC) with a custodial swap service (e.g., CoinOS.io) , I don't "send BTC from Bitcoin to Liquid", ... I send my BTC to the swap service and the swap sends to me their L-BTC.

Even if I peg-in, I'm not technically "sending from Bitcoin to Liquid", ... I'm causing my BTC to be locked and that action causes an equivalent amount of L-BTC to be issued.

It's important to use the correct vocabulary, otherwise you have situations like what happened today (with the hack of Wormhole [ETH]<-->[SOL] bridge) where people holding "ETH tokens on Solana" find they actually only held ETH IOU tokens on Solana, and today those IOUs were worth a whole lot less than 1.0 ETH (until Wormhole said they secured funding to make all IOU tokens whole, ... 1:1 with ETH, once again).

Related:

Blindex, Dapp on Rsk bitcoin sidechain released
#10498
https://twitter.com/BlinDEXio/status/1490319700156456962
https://blindex.io

Bridging services: Sovryn currently provides two non-custodial bridges:

Lightning network ⚡ <-> Rootstock

That's cool!! (except for the 2% fee part)

[RBTC, BTC on LN⚡, XUSD, SOV] <--- Swap --> [RBTC, BTC on LN⚡, XUSD, SOV]

RBTC: BTC pegged token on RSK
XUSD: Stablecoin pegged to the USD, convertible to USDT, USDC, BUSD, DAI, and RDOC
SOV: Sovryn token

Marduk.Exchange

AMM and other DeFi conracts hold Bitcoin and other tokens currently worth $95.3 million. An additional $420.6 million worth of SOV is hosted in Bitocracy DAO’s staking contract.

Author's Tweet of this:

My new article on @SovrynBTC is up on the @efrontier_io blog :)

https://medium.com/efficient-frontier/sovryn-bitcoins-side-chain-defi-environment-43bcb7e892bd

For SOV’s price, Sovryn uses an internal oracle feed from its AMM. Sovryn plans to integrate ChainLink as an additional oracle.

Approximately 52% of Bitcoin miners currently mine RSK, making it one of the most secure blockchains in the world.

Yo, that's a lot. I mean even if the miners don't believe in the underlying asset I guess it's in their interest to merge mine anything they can and liquidate it.