In the normal course of business, a Fund enters into standardized contracts created by the International Swaps and Derivatives Association, Inc. (“ISDA agreements”) with certain counterparties for derivative transactions. These agreements contain, among other conditions, events of default and termination events, and various covenants and representations. Certain of the Fund’s ISDA agreements contain provisions that require the Fund to maintain a pre-determined level of net assets, and/or provide limits regarding the decline of the Fund’s NAV over specific periods of time, which may or may not be exclusive of redemptions. If the Fund were to trigger such provisions and have open derivative positions, at that time counterparties to the ISDA agreements could elect to terminate such ISDA agreements and request immediate payment in an amount equal to the net liability positions, if any, under the relevant ISDA agreement. Pursuant to the terms of its ISDA agreements, the Fund will have already collateralized its liability under such agreements, in some cases only in excess of certain threshold amounts. With uncleared swaps, a Fund bears the risk of loss of the amount expected to be received under a swap agreement in the event of default or bankruptcy of a swap agreement counterparty. If such default occurs, the Fund will have contractual remedies pursuant to the swap agreements, but such remedies may be subject to bankruptcy and insolvency laws that could affect the Fund’s rights as a creditor. Thus, a Fund will typically only enter into uncleared swap agreements with major, global financial institutions that meet the Fund’s standard of creditworthiness. The Funds seek to mitigate risks by generally requiring that the counterparties for each Fund agree to post collateral for the benefit of the Fund, marked to market daily, in an amount approximately equal to what the counterparty owes the Fund subject to certain minimum thresholds, although the Funds may not always be successful. To the extent any such collateral is insufficient or there are delays in accessing the collateral, the Funds will be exposed to the risks described above, including possible delays in recovering amounts as a result of bankruptcy proceedings.
Given the economic and environmental concerns associated with mining, various "minerless" cryptocurrencies are undergoing active development. Unlike conventional blockchains, some directed acyclic graph cryptocurrencies utilise a pay-it-forward system, whereby each account performs minimally heavy computations on two previous transactions to verify. Other cryptocurrencies like Nano utilise a block-lattice structure whereby each individual account has its own blockchain. With each account controlling its own transactions, no traditional proof-of-work mining is required, allowing for feeless, instantaneous transactions.[better source needed]