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    function lockModifyPosition(PoolKey memory key, IPoolManager.ModifyPositionParams memory params) public {
        poolManager.lock(abi.encodeCall(this.__performModifyPosition, (key, params, msg.sender)));
    }

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• fCash is Notional's zero-coupon bond like instrument and derives its value from time to maturity and current interest rate levels:

  • Time to maturity is the time in seconds to a fixed date, where the fCash can be settled into cash

  • There's a notional native market for interest rates that mostly depends on lending vs borrowing volume. This market works as an AMM using the pair (fToken / cToken). A priori, the pair is not expected to have a high volatility, so they provide a curve that works very flat and doesn't trade at pre defined conditions that are considered as limits. Those values are set by governance and currently is ~20% for stablecoin and ~15% for crypto asset pools: .

  • The value of fCash is calculated as PV(fCash) = fCash * e^ - (oracleRate * timeToMaturity)

• Oracle rate is defined by the previous AMM, they provide a TWAP to protect from flash loan attacks. **T

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UniswapV3ExternalPosition

Actions

All the actions we need to interact with are pretty well summarized here: https://github.com/Uniswap/uniswap-v3-periphery/blob/main/contracts/interfaces/INonfungiblePositionManager.sol

1. constructor():
   • Calls mint and creates a new NFTPosition, with a NFT position id, all the bellow params will be included (most of them part of INonFungiblePositionManager.

• Input params:

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Given the integrations above, the following example shows how we could manag

Solution 1: Collateral and debt positions registered as a single asset

• Collateralized assets and debt could be modeled as a single asset (CDP)
• The CDP value would be calculated as: CDP_VALUE = Σ COLLATERAL_ASSET_VALUE - DEBT
• With this new implementation, GAV would be calculated as: GAV_NEXT = GAV_CURRENT + Σ CDP, where current and next represent the current and next release.

Solution 2: Collateral and debt positions registered as different assets

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pragma solidity 0.6.12;

interface IComptroller {

    function callOnExtension(
        address,
        uint256,
        bytes calldata
    ) external;

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Notes on enzyme borrowing

Overview

This gist has some thoughts on a general solution to enable borrowing.

The exercise is divided in the following sections.

• Problem: where the core problem to be solved is formally defined
• Solution: where some solutions will be studied to the previously mentioned problem

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https://www.reddit.com/r/ethereum/comments/6c1jui/delegatecall_forwarders_how_to_save_5098_on/

https://ethereum.stackexchange.com/questions/47174/does-it-cost-more-gas-to-call-another-contracts-functions-in-solidity

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pragma solidity ^0.6.8;

/// Trying to answer the question: Is it more expensive to check variable from a constant or from a memory variable?
/// The answer is that they both have near 0 gas costs (191 vs 213 gas) but checking from constant gives a lower value


contract externalContract {
    
    uint256 storedConstant;
    

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Keybase proof

I hereby claim:

• I am carlos-buendia on github.
• I am buendiadas (https://keybase.io/buendiadas) on keybase.
• I have a public key ASARaaiZS6QVsGHGOYvOevUWa40GZ45_e7toYnro6WSvUAo

To claim this, I am signing this object: