BitPenny

BitPenny is a bitcoin mining pool that uses an open-source client to protect against potential abuses and security vulnerabilities resulting from centralized mining power.

Client-side verification prevents the server from executing double-spending and other attacks. Automatic fail-over to solo mining allows the pool to disintegrate into individual mining nodes and to continue supporting the bitcoin network in a case of server unavailability, preventing a catastrophic slowdown of the entire network. The instant solo fail-over also works to increase miner efficiency by utilizing time that would normally be spent waiting for work from the server due to network lag or other issues.

BitPenny uses a delayed pay-per-share (CPPSRB) payout model that is immune to pool-hopping. Shares are paid in last-in-first-out order and never decay in value, with transaction fees included in order to help avoid large backlogs of unpaid shares. More details can be found at the BitPenny website.