Reserved for updates.

Edited:
OP to include suggestion from Frodocooper, and to ad an after the sale section.
Added second Escrow list
Added " No one's buying it" Thanks to the suggestion from ChiBitCTy

Including the hash of the latest Bitcoin block and its associated block height in the note — in addition to the timestamp and forum user name — may add credence in proving that the said goods did exist and was in the possession of the seller at the time of that particular block.

It doesn't have to be from a specific blockchain explorer. The hash of the block itself is sufficient.

The rationale behind this is that there is no way to predict the hash of a particular block until that block itself has been mined. In this way, we know that a message containing the hash of a particular block could not have been created any earlier than the block itself. Consequently, the earliest possible time that the goods (with the accompanying message) could have been in existence is the time when that particular block was mined. Note, however, that this is only useful in showing proof of existence of the goods. It does not reliably show proof of ownership. The latter requires more robust methods of verification.

My preferred method of proving ownership of the goods is to conduct a video call using Signal. Forum PM would be used to initiate contact with the seller, to exchange Signal phone numbers, and to perform out-of-band key verification — i.e., verifying each other's Signal safety numbers — before initiating the video call. The goods must be clearly shown in the video call, together with a message containing the seller's forum user name. Since a video call takes place in real time, there would be no need for a timestamp. I would then prefer to limit all further correspondence with the seller to within Signal, as our communications would be protected by Signal's robust end-to-end encryption. (If the seller prefers to send pictures of the goods instead of showing the goods via a video call, then a message containing a timestamp and the hash of the latest Bitcoin block would be required to be shown alongside the goods.)

Still open to input.

Hey thanks for reaching out here. Not going to lie I've been giving this some thought and was going to start a discussion around it this weekend when I had more time.

To be clear my stance is a separate post for each offering is essentially spam. You should be actively trying to find a way to group things together this will be better for everyone involved. I remember seeing several threads for L3+'s I think and the only difference really was the location they were. I'll take more time this weekend to explore your structure and site but here's my initial thoughts.

First you should make the thread in "Services" that I originally suggested to you some time back. This can have an OP explaining what you do, how you broker the sales, and how to use your website. Put whatever sales data you want in there but it would be a good anchor point for your business to maintain it's own thread. Use this as you will, you can fill it entirely with your offerings or links to the threads where they are for sale and your website.

Next you can at least try and group your items by algorithm. Whatever it is can be the thread title, and in the OP - which can be updated as much as you like you can change out the offerings. List and group them however you want there; I would go by make. This would be much more manageable for people to see than your current amount of listings. I don't think this will be a jumbled mess if you put the effort into organizing and editing the OP(and replies if needed) with your offerings, you just have to find a way to make it work.

Going further I would probably just do 1 thread, maybe 2. Create your OP and then reserve the next 4 replies, using these to group the gear you have for sale. The OP could link to each Algo, and it would be in 1 place that you could bump daily. You worry about your posts getting out of hand but it wouldn't be that bad as you aren't haggling through the site you are trying to direct them to your sales platform. It also wouldn't matter, regardless if it's the most active topic it only gets bumped to the top by posts or your own bump every 24 hours.

The thread would be active as long as you have items to sell, or choose to continue to do business; so no need to lock or let die until that time.

It is good to have you guidelines after some complaints on Phisycal goods recent weeks. It will help both unexperienced buyers and sellers to make their threads/ posts better. Sellers can learn from the guideline and make their posts/ threads more transparently and impressively to catch eyeballs of potential buyers. Sellers can learn from the guideline to have better overview on posts/ threads they see in Physical goods in terms of transparency, proofs of products, and eventually can make better choices.

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I have only one question (maybe off topic a bit): Can we start a topic without self-moderated option, then can edit with the self-moderated option later?". I tried myself with Additional Options ... but it does not display self-moderated option when I edit my thread.

Added a second Escrow list I came across to the OP, so I figured why not give this a bump for those who haven't noticed it before.
Changed the title as well.

I think this would make a good candidate for an unofficial subforum rules stickie.

I added a section at the end. Feel free to let me know if you feel I missed something. Thanks for the suggestion

Glad you find the content worthwhile. I believe around the time I created it a Mod from a different board had PM'd about getting it added. Nothing ever happened with that so I use it as a link when I find threads that are lacking in the marketplace.

I have seen some people who use the lock-topic to try and avoid spam. I still think it's best to just report posts to be dealt with, because most are using this as an attempt to scam users. I'd personally like to see no unlocking of locked-topics or self modding in sales threads, they're overwhelmingly scammy. Some may find this to restrictive, so in the meantime I just try to spread awareness.