What is Strudel Finance (TRDL) | What is Strudel Finance token | What is TRDL token

What is Strudel Finance (TRDL) | What is Strudel Finance token | What is TRDL token

The Strudel is the first one-way, trustless bridge linking Bitcoin and Ethereum. The bravest explorers that arrive on the other side will get extra $TRDL rewards. You can only enter the Strudel from one direction so be aware! This action is irreversible. What is Strudel Finance (TRDL) | What is Strudel Finance token | What is TRDL token


Centralized Bitcoin bridges expose the Ethereum ecosystem to systemic risk. Projects like REN and WBTC lock BTC in  insecure multisig setups and  raise concerns of total value collapse.

Strudel is the first one-way, trustless bridge linking Bitcoin to Ethereum. vBTC, the resulting asset, trades off counterparty risk for market risk, bringing more diversity to the tokenized-BTC landscape. In the long term Strudel is about using the forces of crypto-economics to challenge the status quo of blockchain and free BTC from the grip of Wall Street.

Transforming BTC to vBTC

By using the  Strudel Dapp, Bitcoins are burned and marked with the Strudel protocol identifier. The burn transaction is then relayed to Ethereum, issuing vBTC in the exact ratio of 1:1.

Use on your own risk. Your Bitcoins will be burned! Read more here.


$TRDL (/ˈstruːdəl/) is the governance and reward token for the Strudel Protocol. It is created on 2 separate occasions:

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  • When a user crosses BTC over the bridge, $TRDLs are minted alongside vBTC. Early users receive an exponential reward as depicted in the graph.
  • $TRDL rewards are distributed per block to liquidity providers of various terra-farming pools. Of those, the vBTC-ETH pool takes a special role in maintaining the price peg.

🚀 Terra-farming starts at block #11.021.639 with 1 $TRDL per block.

🎉 Until Block #11.434.002 - December 11 there will be a _**_4x $TRDL**_ bonus 🎉_

👉 Enter the Strudel here: __https://strudel.finance

vBTC Price Stability

The Strudel Protocol implements a unique pegging algorithm keeping vBTC prices synced with BTC. Those willing to be slightly leveraged-short on BTC, deposit liquidity into the vBTC/ETH pool to earn fees by facilitating market making activities.

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The algorithm utilizes Balancer Smart Pools, Uniswap Price Oracles and the flash-loan capability of vBTC. Continuous trades issued by the peg algorithm stabilize the price and provide a price guarantee within limited bounds.

  • When ETH and BTC market prices correlate, liquidity providers simply earn rewards.
  • When ETH goes up against BTC the pegging algorithm issues trades. Those profits are used to buy back $TRDL and burn it.
  • When ETH goes down against BTC the liquidity is used to support the market price through arbitrage trading. The peg can be guaranteed up to a price disparity of 300% starting from todays price. Only when this threshold is exceeded, the arbitrage stops, and the token starts to float free.

Nowadays market conditions are optimally aligned for the proposition the Strudel protocol is making. While ETH is steadily gaining market dominance, the tokenized BTC supply of projects like WETH, REN and SNX is going through the roof.

Bridging BTC into DeFi without Intermediaries

The supply of tokenized Bitcoin on Ethereum relayed through centralized, trusted bridges now tops $1.1B. While the demand for Bitcoin in DeFi is expected to grow, a better solution without counterparty risk for bridging is needed. This post will introduce the technical components of the trustless, one-way bridge operated by Strudel.

Strudel Bridge Design

When BTC is requested to be transferred using the Strudel Dapp, a transaction output with the transfer amount and the receiving Ethereum wallet address is created. This output is handed to the user’s Bitcoin wallet through the QR code. When a user signs a transfer the resulting transaction might look something like this.

Notice the OP_RETURN in the first output,  OP_RETURN is a Bitcoin-script opcode used to mark a transaction output as invalid.

Next, the header of the Bitcoin block containing the transaction needs to be registered in the relayer contract on Ethereum, where its proof-of-work is verified and the canonical chain is extended.  Simple payment verification (SPV), a protocol used by Bitcoin light clients and wallets, prevents invalid blocks from entering the relayer.

Once the transaction containing the burn has been buried under enough proof of work (6 blocks), an inclusion proof is relayed onto Ethereum. The proof is verified by the Strudel contract which mints vBTC in a ratio of 1:1 to the designated Ethereum address. The protocol strictly mints 1 vBTC for 1 burned BTC, not taking any fees for bridge crossings.

Future Burn Methods

OP_RETURN is a clean way to burn BTC, where outputs are removed from the memory of Bitcoin nodes and don’t pollute the state. Unfortunately, only few Bitcoin wallets support the payment protocol (BIP70), which is the only way to construct transactions with OP_RETURN outputs.

For those users that want to burn with a BIP70-incompatible wallet, a fallback will be provided soon. The Ethereum address will be injected into a P2SH (pay to script-hash) output instead of a valid script, creating a P2FSH (pay to fake script-hash) output. While P2FSH outputs can never be spent, the Strudel protocol can use the data embedded in them to mint vBTC to designated addresses.

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Burns by P2FSH outputs can only be picked up by the same account as encoded in the output. The account has to be msg.sender of the relay transaction as seen by the vBTC contract.

Relayer Contract

The relayer contract is the heart of the bridge architecture. It is able to verify new block headers of the Bitcoin blockchain and construct a canonical chain. It acts as an on-chain implementation of a Bitcoin light client.

The Strudel team is very thankful to our friends at Summa for creating and operating the first version of such a contract. Our bridge wouldn’t be possible without the function and data that the contract provides. We want to support the operation of the contract through relayer rewards. Currently, 3 different functions of the contract are proxied by the vBTC contract and pay out rewards for valid header relays.

Opening Bitcoin to DeFi

Current Bitcoin holders have no way to let the capital in their wallets work for them — to hodl is the only way. By equipping BTC with the ERC20 interface and smart-contract interoperability it becomes more versatile - it becomes vBTC. The future for Bitcoin on the DeFi space is bright, as its supply can be locked into protocols for lending, options, and other DeFi use-cases, reducing its volatility and potentially increasing market value.

vBTC upgrades BTC with another tool to hold its ground in Blockchain finance — flash loans. Flash loans are instant uncollateralized loans for the duration of only one transaction. While other tokens need to be pooled, before they can be flash-loaned, every vBTC holder has the ability to borrow up to 21,000,000 vBTC at any time — this feature is also used in our pegging algorithm.

How to enter the Strudel

In order to make your exploration through the Strudel as secure as possible — read these instructions on how to enter first.

Mint vBTC

  1. To start of, simply connect the Dapp with your wallet. We support  Meta Mask and  WalletConnect.
  2. Put the desired amount of vBTC, that you want to mint, in the interface. Check your vBTC and the estimated $TRDL rewards you gain. The Strudel contract strictly mints BTC to vBTC at a ratio of 1:1. Tor early explorers, the $TRDL rewards are distributed at a quadratic rate — so be quick.
  3. Once you continue you can see an individual QR code, based on your inputs and the connected wallet. You can either scan the code or copy & paste the payment link in your Bitcoin wallet’s recipient input field.

Compatible Wallets

Only  BIP70 compatible wallets can cross the bridge. The following wallets have been tested and work properly:

  • Bitcoin.com ( iOS or  Android)
  • Mycelium ( iOS only)

To allow all wallets to enter the Strudel a P2FSH implementation is in the making.

Claim vBTC and $TRDL rewards

Once you have entered the Strudel — the contract will wait until 6 block confirmations on the Bitcoin Blockchain. The interface provides an update during this process. Once confirmed, you can claim your vBTC and $TRDL rewards.

❗️The longer you wait to claim your tokens, the more it will cost. This is due to the relayer function of the bridge. It relays every Bitcoin block header on Ethereum — the longer it has to go back in history to check the inclusion proof the more it will cost.❗️

Immediate claim: 200.000 gas

2 week claim: 2.000.000 gas

Maximum claim time: 3 weeks!

Start Farming the Flippening

You can put your vBTC and $TRDL into DeFi immediately and support the project by providing liquidity. Strudel makes use of crypto-economic incentives to strengthen the trustless bridge and the protocol. When you put liquidity pool tokens into the Strudel — 🛰 Terra-Farms — you stabilize the peg of BTC to vBTC and earn rewards by taking a short position on BTC dominance and go long on Ethereum. You can read more about that here.

  1. Deposit Liquidity into the major pools of vBTC-WETH or $TRDL-ETH. You will need both of the assets to stake liquidity. For vBTC-WETH you will need vBTC and wrapped Ether. For $TRDL-ETH you need $TRDL and ETH.
  2. Once you staked the desired amount of vBTC and WETH or $TRDL and ETH you will get LP tokens (Liquidity Provider Tokens). The LP token of vBTC-WETH is called vBTC++.
  3. Now that you have the respective LP token you can stake the respective LP tokens in the reward pools  vBTC-WETH LP or  $TRDL-ETH and farm $TRDL.
  4. Earn $TRDL rewards — harvest your rewards, enter more liquidity and repeat.

You have now successfully crossed the first one-way, trustless bridge and earn rewards.

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