Just before Satoshi disappeared, he was working on a way to extended Bitcoin to create trustless decentralised marketplace on the blockcahin. After nearly eight years of development Particl Marketplace launched last week, it provides a decentralised marketplace built into a blockchain using smart contracts. The wallet provides an intuitive eBay style GUI.

“I started implementing a marketplace feature earlier that facilitates offering things for sale and taking orders, it's only half done though.  A bit like e-bay but without auctions, just "buy now".  Among other things, it would make it easy for anyone to offer currency exchange.”
    - Satoshi Nakamoto, Apr 14, 2009

I'm not a member of the Particl team, but I have been following the project closely since c.2014 so I can provide my notes here as a starting place for other people's research and am happy to answer questions as best I can. Below are some of the key highlights as I see them.

Particl integrates a trustless decentralised marketplace into the Bitcoin blockchain source code. Particl provides an eBay and Amazon style marketplace inside its wallet software, allowing users to buy and sell natively with crypto via blockchain smart contracts.

    

A decentralised exchange has also been built on the Particl blockchain allowing exchange between all cryptocurrencies that support atomic swaps such as Bitcoin, Monero and Litecoin. Atomic swapping allows currencies to be swapped directly between separate blockchains. This exchange is currently in working beta. Later versions will allow users to pay for goods on the marketplace using currencies supported by the built in exchange.

    

The marketplace connects buyers and sellers directly, with no middle man. They are protected by Particl’s decentralised smart contract escrow which makes scamming infeasible. It works in the following way:

Buyer makes payment for item plus a deposit into escrow (blockchain smart contract). The seller puts the same amount of deposit into escrow (the same blockchain smart contract). Seller ships item. If the buyer is happy with what they received, they release the escrow and the buyer gets back their deposit, the seller their deposit plus payment. If the buyer is not happy then they talk with the seller to try and resolve their issue. Only the seller can release the escrow. An escrow contact has no expiration period to give the buyer and seller time to resolve any disputes. The current escrow for the beta launch is 100% of the item price; in future this will be adjustable between 100-0%. See diagram for more datils.

    

Unlike centralised cryptocurrency marketplaces and websites, Particl cannot disappear with your funds, so your money is always safe. Everything goes via the blockchain. No third party needs to handle funds.

Buyers and sellers do not need to sign up - signing up is the same as creating a bitcoin address - so no personal information is submitted to the network. The marketplaces can also be viewed for free simply by downloading and running the wallet.

Security is paramount: all communication between users is encrypted. The software does not permit things like hyperlinks outside of the client as this could reveal a users IP. There is shortly to be native Tor and I believe I2P support is in the works too.

Anything can be listed, but socially inappropriate items can be voted off by users, using their coin balance as voting weight.

Particl is an evolution in privacy coin technology. Like Monero it uses ring signatures, but provides more; 24 vs 11. It also provides blinding.

Non-transaction data, such as images and text, are kept off the blockchain and sent via Particl’s inbuilt encrypted messaging system instead. This protocol is based on bitmessage. To avoid spam users pay for the duration they want each of these messages to persist on the network. This is more scalable for data intensive dApps than something like Ethereum.

To stake Particl coins, users need to lock-up their coins for a period of time. Furthermore each time an item is purchased and shipped, the decentralized escrow locks the payment, plus a deposit from the buyer and seller, into escrow. Both these activities take a lot of coins out of circulation. So Particl’s price should rise with actual use as the same amount of Particl coins chase more and more goods on the marketplace.

Since its beta launch in August 2019 Particl has facilitated tens of thousands of listings and thousands of sales.

Particl is open source and closely mirrors the Bitcoin code base and remains current with all its latest upgrades such as taproot.

Particl was a top 20 crypto in 2015 for around two years. It has remained a top 10 crypto for code commits since 2015 - https://www.cryptomiso.com/.

Particl is a dApp platform, the decentralized marketplace is just the first app.

You can download the software here: https://particl.io/downloads/

Links for more information:

Website: https://particl.io/
Team: https://particl.io/team/
Linked In: https://linkedin.com/company/particl/
Github: https://github.com/particl
Twitter: https://twitter.com/ParticlProject
Forum: https://particl.community
Reddit: https://www.reddit.com/r/Particl
Instagram: https://www.instagram.com/particl.official
Youtube: https://www.youtube.com/c/particl
Facebook: https://www.facebook.com/ParticlProject
BitcoinTalk: https://bitcointalk.org/index.php?topic=5227333

I’ve been following the Particl decentralised marketplace project for about seven years now, I think its taken so long because it's a truly decentralised technology. Yesterday it launched its decentralised marketplace - https://particl.io/downloads/.

How is this relevant to trading? Because the beta of the marketplace which ran a while back for around a year ended up being used as a decentralised exchange of sorts. Coins were being traded for other coins via fixed listings.

I know availability of lesser coins on exchanges has been an issues for the community, so this could provide another way to buy and sell, and because it’s truly decentralised there is an argument it’s more secure and reliable than a centralised exchange. There is no middle man, no website, the eBay style interface is built into the wallet and all transactions are protected by Mutually Assured Destruction (MAD) escrow. that insures buyers and sellers don't get scammed.

The entire Particl decentralised marketplace runs off of the native currency called PART and all trades have to go via PART, so for example an ETH to BTC trade would need to go via the following route ETH > PART then PART > BTC.

A listing for XCH coin appeared yesterday when it lanced. You can also buy and sell more every day items like the stuff you would find on eBay and Amazon, and other things like NFTs. If you want to see what's for sale on the marketplace you need to install and run the wallet.

I know this question gets asked a lot, but in this post I want to discuss my answer, not the question. I give this answer so often to so many people that I just wanted to run it past the community to check it seems sane.

Q: "Bitcoin can only handle 7 transactions a second. Surely this makes it unusable for day to day transactions?"

A: "The block size is one of the main components limiting transaction throughput. Miners receive a reward for each block: this reward is composed of a subsidy, originally 50BTC per block, currently 6.25BTC per block; and fees for each transaction paid for by individual users. Over time the reward will become so insignificant that the miners will collectively be incentivised to focus on increasing the amount of fees they receive for each block, encouraging them to reach consensus on increasing the number of transactions in each block. This has already happened with segregated witness; other techniques will no doubt be implemented to further increase this, possibly even just increasing the permitted data size of a block. So I believe this problem will just solve itself over time and isn't something to worry about long term."

So is the answer I'm giving feasible or has the code base ossified so much this type of change is simply off the table?

I always tell people that Bitcoin is still bootstrapping; it won't have matured until its around 130 years old. So any conversations about its usability at this point is a getting ahead of its self. Like a cake that's still baking if you try to eat it now you'll find the middle is still liquid and raw. I think also the idea something is architected more for the use of future generations than us sitting here now discussing it seems very alien to people.

For the first coins issued by Microsoul, 1BTC denomination, does anyone know what the private key format is or where I can find out?

I am selling my titan mint coins which I have peeled. They are all 2FA. They are the very first batch of coins the Titan Mint produced, numbers 17 to 26 of 10,000. The holograms are still partially attached to each coin and the coins are untouched and in mint condition. Each comes with its original capsule and paper certificate.

Sample photos of the coins:







Please PM me if you are interested with an offer price.

I'm trying to find a litecoin address that has been used a few times on the litecoin blockchain, but I only have the first 32 characters so missing potentially 1 to 3 characters off the end of the address.

Does anyone know a way to look this up some how and find the full address? I've had a look around for something like a first bits search or anything like that, but all the blockchain explores I've looked at don't have this feature.

I'm pretty sure it'd be easy to find with the right search tools as its very unlikely to have a collision with another used address at 32 characters in length.

I read on the forums that mycelium wallet was no longer supported by the developers, google play reviews seemed to support this. Is this correct, can anyone give me a definitive answer?

...Google’s update is not limited to crypto YouTuber’s, it has also hit some crypto news outlets as well. Carl Runefelt, YouTuber and founder of The Moon AB says, “This latest development regarding YouTube censorship against bitcoin-videos is very alarming. Youtube is now clearly deliberately limiting the reach of my videos when I put the word bitcoin in the title.”

Oh dear. Seems we can't trust the every day tools we are using. But this is ultimately not a surprise.

I wonder what Googles motivation for doing this is?

Does anyone know what format the XMR keys are on the Lealana 100, 50 and 25XMR coins smoothie made? I can't find any info on redeeming the funds on them.

I'm trying to locate smoothie's public key he uses to sign stuff for Lealana. I've got as far as finding this:

http://pool.sks-keyservers.net:11371/pks/lookup?op=get&search=0x9AB257BFA764D833

Does anyone happen to know if this is the correct pub key?

The reason I'masking is I've got a signed message from him for some coins to prove authenticity. But I'm having problems verifying the signatures. When I use Kleopatra with the following key and the signed message copied to memory I get the following error:

Not enough information to check signature validity.

Particl has launched its decentralised market place in beta and there are already a few interesting listings:

https://www.demarkets.io/explorer

Particl is a fully decentralised market place on a block chain - it's not implemented in ethereum - I've been testing it and it works really well; I've sold one item so far and bought another, it was smooth and easy.

If you want to buy or sell you can download the wallet here:

https://particl.io/downloads/

Create a new wallet and call it 'market' to see all the listings in your wallet.

Snazzy marketing video:

https://www.youtube.com/watch?v=PRxmGh24ILU&list=PLtbTcMbZZKfy_FynlisfnRFLaGAeDdCSy

Seems Bittrex International is closing in late Oct:

https://bittrex.zendesk.com/hc/en-us/articles/360034545191-Bittrex-Technology-Platform-to-Power-New-Bittrex-Global-Digital-Asset-Trading-Exchange-

Does any one know more?

I've just finished reading this book: Moneyland: Why Thieves And Crooks Now Rule The World And How To Take It Back



It gives a very good overview of the landscape of opaque accounting. Many currencies are universal but the financial and regulatory laws in countries are not; so people are using these principles to steal money, dodge the law and avoid paying tax. It also makes me wonder how much of this money has moved into crypto.

Has anyone else read it?

I'm selling a 25BTC Casascius Series 1 (error coin). Coin is fully loaded.

It comes with a digital certificate of authenticity consisting of a PDF scan of the coin signed with the makers (Mike Caldwell's) Adobe key.

It also comes in its origonal pouch. The coin has been untouched since receipt. See photos below, photos are of front and back, in good light, and also with with flash to try show details of the coin.







At this point I am trying to gauge market interest, so serious offers only. BTC or MaidSafe payment only.

I'm selling a 5BTC Casascius Series 1 (error coin). Coin is fully loaded.

It comes with a digital certificate of authenticity consisting of a PDF scan of the coin signed with the makers (Mike Caldwell's) Adobe key.

It also comes in an airtight capsule and has been sealed and untouched since receipt. See photos below, each is taken front and back, in good light, one photo with flash and one without.







Coin has been untouched and sealed since receipt from Casascius.

At this point I am trying to gauge market interest, so serious offers only. BTC or MaidSafe payment only.

We are Cryptonomy, we specialise in cryptocurrency and digital token security. We are the preferred supplier for Leger Wallet development, a hardware wallet that provides cold storage for cryptocurrencies.

We are looking for experienced developers to join our team to create and enhance Ledger Wallet applications. You will need the following skills:

    - JavaScript
    - Cryptographic libraries
    - Embedded C code
    - Good Jira and Git knowledge
    - Scrum and agile proficient

You will need to be able to project manage a small project and report to our customers on a recurring basis over VoIP and video.

We mostly work remotely, so you are welcome to work from your home office. We welcome applicants from anywhere within Europe or the east coast of the US.

Rates will be c. £400 - £500 (GBP) per day depending on the work and the client.

I'm selling a 5BTC Casascius Series 2. Coin is fully loaded.

It comes with a digital certificate of authenticity consisting of a PDF scan of the coin signed with the makers (Mike Caldwell's) Adobe key.

It also comes in an airtight capsule and has been sealed and untouched since receipt. See photos below, each is taken front and back, in good light, one photo with flash and one without.






Coin has been untouched and sealed since receipt from Casascius.

At this point I am trying to gauge market interest, so serious offers only. BTC payment only.

I'm selling a 5BTC Casascius Series 2. Coin is fully loaded.

It comes with a digital certificate of authenticity consisting of a PDF scan of the coin signed with the makers (Mike Caldwell's) Adobe key.

It also comes in an airtight capsule and has been sealed and untouched since receipt. See photos below, each is taken front and back, in good light, one photo with flash and one without.







Coin has been untouched and sealed since receipt from Casascius. Sadly are some marks pressed into the label on the back of the coin. I have checked it under a microscope and the label is unbroken, so superficial pressure damage. Please inspect photos for more details.

At this point I am trying to gauge market interest, so serious offers only. BTC payment only.

EDIT: I am also selling a large collection of Casascius coins - 35BTC face value (25 x 1 and 20 x 0.5) here.

I'm seriously considering having a clear out of some Casascius coins. They are the following specification:

    - 25 x 1BTC, series 2 back, 2013 front
    - 20 x 0.5BTC, series 2 back, 2013 front

They are from the last batch Casascius ever made before shutting his website down. Each comes with a digital certificate of authenticity consisting of a PDF scan of the coins signed with the makers (Mike Caldwell's) Adobe key.

Each comes in an airtight capsule and has been sealed and untouched since receipt. They are basically in as mint condition as possible. Please click this link to access a page to download a zip file of photographs of each coin with signed pdf certificates if you are interested, each is taken front and back, in good light, one photo with flash and one without.

I am a UK seller so would prefer a face to face sale.

At this point I am trying to gauge market interest, so serious offers only. BTC payment only.

EDIT: I am also selling a 5BTC casascius here.

So I am thinking of selling a 5BTC and a 1BTC Casacius coin. I'm keen to get something a little better than face value for them as I think it would be really sad to have to peel them to redeem them. I'm conscious an auction will probably not achieve this. Advice welcome.

Pics of 5BTC coin:





Comes with a digital certificate of authenticity. Been sealed in a coin capsule since receipt.

Pics of 1BTC coin:





Base value of 5 BTC coin:
- BTC: 5
- BCH: 0.617
- BCG: 0.06
- CLAM: 0.00274
- DMD: 0.07
Total: 5.684 BTC

Base value of 5 BTC coin:
- BTC: 1
- BCH: 0.123
- BCG: 0.012
- CLAM: 0.00055
- DMD: 0.014
Total: 5.150 BTC