Thanks Andreas, that's actually a pretty good use-case I didn't think of.
Perhaps you could make the rule: "To spend from an unconfirmed BIP125 output, the transaction feerate needs to be higher than its unconfirmed parent's effective feerate."
It doesn't totally solve the problem, but I think in practice would do a good job (most of the problematic descendants tends to be low feerate sweeps). It would also preserve the ability for receivers to use CPFP if they wish.
-------- Original Message --------
Subject: Re: [bitcoin-dev] BIP proposal: No chaining off replaceable transactions
Local Time: July 4, 2017 6:50 AM
UTC Time: July 4, 2017 11:50 AM
From: bitcoin-dev@lists.linuxfoundation.org
To: bitcoin-dev@lists.linuxfoundation.org
Your BIP would take away the only way the *receiver* has to raise the
fee: CPFP. And the receiver is arguably the more important party in this
question. After all the sender has no real incentive for his payment to
be confirmed; it"s receiver who has.
On 07/02/2017 10:35 PM, Rhavar via bitcoin-dev wrote:
> ==Abstract==
>
> BIP125 allows transactions to opt into replaceability with a primary use
> case
> of allowing users to increase the fees of unconfirming transactions,
> helping create
> a more efficient fee market place.
>
> However this goal is hindered when the receiver of a transaction spends
> from the
> unconfirmed output, which exposes the sender to the awkward position of
> needing
> to pick between needing to pay an effectively unbounded amount of money
> as per the BIP125 rules, or not fee bump at all.
>
> This is especially problematic in the case of batched sends in which
> there are
> multiple independent receivers. In practice this means wallets and
> services can not effectively low ball the fee of transactions, with the
> intention of fee bumping due to the risk of the receiver spending or
> sweeping it before it confirms.
>
> In order to support a healthy fee marketplace, this proposal aims to
> increase
> the utility of bip125 by making transactions that spend an unconfirmed
> BIP125
> output non-standard.
>
>
> ==Summary==
>
> This policy specifies a max chain depth of 1 for any BIP125 transactions.
>
> ==Impact==
>
> Receivers of BIP125 transactions will need to wait until the transaction
> has confirmed before spending from it. This will not be significantly
> different
> than it is currently as they receivers need to be monitoring for
> replacements.
>
> If senders want to make further transactions before the BIP125
> transaction confirms,
> and need to utilize the change of the transaction: they will need to
> replace the
> transaction with a one that makes the other send in "pass through" style
> or first
> finalize the BIP125 transaction and then chain from the spend normally.
>
>
> -Ryan
>
>
>
>
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