On Sat, Jul 11, 2015 at 10:30 PM, Dan Bryant <dkbryant@gmail.com> wrote:

I think a compromise will be somewhere in the middle. I think most people would be OK with TXs that don't have enough fees for P2P transfer to stay in deadmans land. Most people are stuck in a situation where they payed enough to get it into (and keep it in) the pool, but not enough to get it out.

Agreed. A lot of the functionality could be achieved by a system that works in most cases. Even if 100 transaction chains aren't supported, 3-5 transaction chains would give a significant fraction of the desired functionality.

At the moment, a transaction is only added into the memory pool if it meets the relay threshold and spends transactions that are either in the memory pool or in a block.

There is an orphan pool that can store up to 100 orphans.

The same could be done for child pays for parent. A node could remember the last 100 transactions (up to 5000 bytes) that were rejected from the memory pool due to insufficient relay fees.

This allows nodes to send a chain of transactions in a row. If the child is sent last, then the parent(s) will be in the unrelayed transaction pool.