Conduit Address for setApprovalForAll

[adraffy]

How do I derive the conduit address for an owner so I can provide pre-approval for selling on OpenSea during my minting process?

On Rinkeby, when I (0x51050ec063d393217B436747617aD1C2285Aeeee) sell an ERC721 (0xa7b92650cb392fbefcb8fc02e32babde854742f1) on testnets.opensea.io for the first time, it wants approval for 0x1E0049783F008A0085193E00003D00cd54003c71 which appears to be a conduit.

From the ConduitController, I can reverse that conduit to a key 0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000

How do I derive this key? I assume it is tied to an owner + the marketplace (OpenSea in this example)

I see that key is provided in JSON from a GraphQL request for CreateListingActionModalQuery which also include a Zone (0x00000000E88FE2628EbC5DA81d2b3CeaD633E89e)

Is there a reason none of this documented?

Any help would greatly appreciated. Thanks.

[adraffy]

According to this tweet the mainnet conduit address is also 0x1E0049783F008A0085193E00003D00cd54003c71.

[Slokh]

There is no per-user proxies anymore, all OpenSea users will use 0x1E0049783F008A0085193E00003D00cd54003c71 as the Conduit.

[syffs]

Could you please tell whether you advise future NFT contract to include something as below for gas free listing:

function isApprovedForAll(address owner, address operator)
	public
	view
	virtual
	override
	returns (bool)
{
	if (operator == 0x1E0049783F008A0085193E00003D00cd54003c71 ) {
		return true;
	}

	return super.isApprovedForAll(owner, operator);
}

[adraffy]

In general, for any address that's you want to pre-approved, you should probably use a negated approval mapping.

Something like:

isPreapproved(address) {
    return address == 0x1E0049783F008A0085193E00003D00cd54003c71;
}

setApprovalForAll(operator, approved) {
    if (isPreapproved(addr)) {
        disapprovals[sender][operator] = !approved;
    } else {
        approvals[sender][operator] = approved;
    }
}

isApprovedForAll(owner, operator) {
    if (isPreapproved(addr)) {
        return !disapprovals[owner][operator];
    } else {
        return approvals[owner][operator];
    }
}

[syffs]

I agree, did that in a hurry.
My point is, if we're supposed to pre-approve it, then

• this should be updated
• to be backward compatible with all the contracts that included pre-approval through proxy registry, proxy registry should be updated to return 0x1E0049783F008A0085193E00003D00cd54003c71 as proxies for everyone. You cannot claim to be improving gas with seaport if you're breaking gas free listing for all contracts that used to support it.

[adraffy]

Agreed.