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Border Wallets: A New Way to Create and Easily Memorize Bitcoin Seed Phrases

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Border Wallets: A New Way to Create and Easily Memorize Bitcoin Seed Phrases

This is an opinion editorial by Wartime Microchad, a contributor for Bitcoin Magazine.

Introduction

Since the introduction of Bitcoin Improvement Proposal (BIP) 39, Bitcoiners have had the option to memorize the information necessary to recover bitcoin funds stored on-chain by using plain text words. But memorizing — and then reliably recalling at a later date — 12 or 24 unrelated, noncontiguous words isn’t easy, which means that most people create and store physical backups of those words instead of committing them to memory.

While this well-established approach is fine for those who are confident in their physical security setup, it can be a big challenge for others, e.g., people with no fixed abode; those who need to travel or who live in areas of conflict/war zones; or those living in other settings where storage of physical seed phrases may be subject to security, loss, damage or confiscation risks.

An example of how someone recently had their bitcoin seed words taken from their home.

Running The Numbers

To put the scale of this problem into some context:

  • According to the United Nations’ refugee agency UNHCR, by the end of 2021, 89.3 million people had been forcibly displaced worldwide. For a large number of these people fleeing their homes, they would have been able to take little more than the clothes on their back and whatever personal belongings they could carry. The transportation of any wealth along with personal belongings may have been an impossible challenge, and fraught with risks.
  • According to the Nomad Embassy, nearly 5 million Americans identify as digital nomads and another 17 million aspire for this lifestyle. That’s 6.5% of the U.S. population who either currently or want to live a roving lifestyle. Frequent border crossings and life in rented accommodation can make it difficult to protect private keys.
  • An estimated 35% of Americans rent their accommodation, and house-sharing is on the rise as home ownership collapses, especially amongst younger generations. It is not uncommon for personal belongings to disappear in shared accommodation.

So we wanted to create a way for Bitcoiners who face these difficulties to more easily and reliably transport their bitcoin across borders. We named the solution Border Wallets.

Patterns Versus Words

Imagine having five seconds to memorize either (A) or (B) from the choices below.

Which one is easiest and most likely to be recalled after a few days?

The Science (™)

Some formerly conducted studies have shown that we are far more capable of recalling patterns versus words after prolonged amounts of time.

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After being shown a random collection of words and shapes, participants had much higher levels of recall for shapes than words.

Being able to recognize shapes more easily than words bears out anecdotally too — we tend to remember faces more easily than names (which makes sense, given that our eyesight and facial recognition abilities predate our use of language).

This phenomenon is known as the “picture superiority effect.”

The Litmus Test

Let’s see if this works.

In the spaces provided, have a go at recalling the missing words and the missing pattern from the example we showed above. No cheating!

Memorization Using Border Wallets And Entropy Grids

Border Wallets provide a method for memorizing seed phrases using three components:

  • Entropy Grid: A randomized grid of all 2048 seed words.
  • Pattern: User-generated pattern(s) or cell coordinates.
  • Final Word “Number”: The final (checksum) seed word.

Combined, these three components comprise your Border Wallet.

The Entropy Grid Generator

Using our offline, browser-based entropy grid generator (EGG), users can generate their own entropically-secured, randomized grid of all 2048 BIP39-compliant seed words, and then apply a memorable pattern or set of cell coordinates to it — which only they know — in order to create a wallet.

While the EGG is browser-based, it is designed to work offline on an air-gapped PC, Mac or Linux machine (or even using Tails) and runs locally in the browser. To use it, users download it, transfer it to the machine of their choice and start generating entropy grids.

An example of a memorable, 23-cell pattern applied to an entropy grid to create a Border Wallet. The 24th / final word (the “checksum”) or final word number can be calculated natively within the EGG.

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As each unique entropy grid contains a complete list of all BIP39 seed words in randomized format, and the users’ patterns exist only in their heads, users will store their entropy grid (or its recovery phrase) physically or digitally. Since entropy grids comprise all 2048 Bitcoin seed words in a random format, any evil maid attacks are faced with an upward difficulty adjustment that is significantly higher than if plain text seed phrase backups were discovered. You can think of it as a firewall between your seed words and any potential attackers.

Other Features

Final Word Calculator And Final Word “Number”

The EGG allows users to import the relevant 11 or 23 words from their entropy grid in order to calculate the final checksum word. In addition to the user’s pattern, the checksum is the only thing that must be memorized.

However, in order to make this even easier, the EGG includes a unique “final word number” feature. With this, instead of needing to remember the word “pair,” users can just remember the number “5” — they could even write down this number on their entropy grid since, on its own, it is meaningless and provides no clues about the final word without the other words being known.

Users may also change the final word number to something more meaningful to them, although this also changes the final word itself. Therefore, if users do change the number, the new checksum shown must be used to set up your Border Wallet. We don’t advise users to change the number (since it is generated with entropy by the tool), but the option is there if desired.

The EGG’s “final word” feature provides automatic calculation of the checksum. This checksum, or its associated “final word number” — a unique feature within the tool — is the only word that must be remembered to recreate the Border Wallet.

Deterministic Grid Regeneration

When creating an entropy grid, the EGG provides the option to choose deterministic entropy. By using 128 bits of entropy in the creation of these grids, we have the ability to simultaneously generate 12-word recovery phrases that give a plain text backup. Recovery phrases are automatically added to the bottom of deterministic entropy grids during generation.

An example of a 12-word grid recovery phrase provided when you generate a deterministic entropy grid. This provides the option to save entropy grids in plain text format. It looks and behaves like a normal Bitcoin wallet and therefore could be used as a decoy/canary.

The provision of a 12-word recovery phrase may at first glance seem counterintuitive to the concept of Border Wallets — after all, we are giving users the ability to memorize seed words, not find new ways of writing new ones down! However, some users may find value in having the option to make handwritten or digital copies of regeneration words in some circumstances: for example, if they want to store a copy of an entropy grid with a third party (sibling, parent, child, etc.) for safekeeping.

Since all 12-word recovery phrases are valid BIP39 mnemonic phrases, this gives additional options for deploying decoy funds on the resulting wallet or just to have nothing at all on them. In the latter case, an attacker may spend money and resources trying to brute force a passphrase on a seed phrase that looks like it should have funds, but which only unlocks an entropy grid.

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Gridception And The Art Of Obfuscation

As there is essentially zero cost for generating entropy grids, users may choose to generate dozens (or even hundreds) of individually numbered grids, storing their preferred grid among considerable “noise.” Imagine having 100 unique and individually numbered entropy grids, the user being the only person who knows which grid(s) might have been used to generate the Border Wallet.

Gridception offers users the ability to use words from one Entropy Grid to generate new grids – dramatically increasing attack difficulty!

In fact, there is no reason why a user cannot generate multiple patterns — or even multiple entropy grids — to create a multisig wallet that they can carry in their head. Deterministic grids also unlock the ability to introduce multigrid solutions whereby a primary entropy grid is encoded within other entropy grids. We call this gridception.

To do this, users would generate a grid and then construct a 12-word pattern to apply it onto that grid. They then take those 12 words and input them to the “grid regeneration” tab within the EGG, producing a second grid. This can then be repeated to create new grids ad infinitum.

“A dream within a dream. I’m impressed. But in my dream, you play by my rules” — Saito, Inception

Encryption

For entropy grids stored digitally, i.e., on one’s personal computer, USB thumb drive or secure online cloud storage, the EGG features an option for users to natively encrypt and decrypt their entropy grids all within the tool’s interface. Once users have created a secure password, they drag and drop their entropy grid into the tool for encryption, producing an encrypted .json file that they can then store more safely in digital format. To decrypt, the .json file is imported back into the tool and unlocked with the same secure password.

Handling Seed Word Randomization

For “maximum” entropy grids — which use a truly cosmic 19,580-bits of entropy — the EGG employs the Fisher-Yates shuffle algorithm and the browser’s cryptographically strong pseudo-random number generator seeded with truly random values for generating a random permutation of all BIP39 seed words.

The option to reproduce deterministic entropy grids using 12 words — created using 128-bits of entropy — uses Gibson Research Corporation’s ultra-high entropy pseudo-random number generator.

Applications For Bitcoin And Beyond

For Bitcoin, Border Wallets and entropy grids offer new applications and solutions for bitcoin cold storage and transportation, legacy planning, gifting, third-party custody assistance as well as, most obviously, border crossings.

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Looking beyond Bitcoin, however, we envisage the idea being applicable to other decentralized protocols where seed words are used for user account backup, i.e., Nostr, Web5 and other decentralized identifier-type systems.

This is a guest post by Wartime Microchad. Opinions expressed are entirely their own and do not necessarily reflect those of BTC Inc. or Bitcoin Magazine.

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El Salvador Takes First Step To Issue Bitcoin Volcano Bonds

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El Salvador Takes First Step To Issue Bitcoin Volcano Bonds

El Salvador’s Minister of the Economy Maria Luisa Hayem Brevé submitted a digital assets issuance bill to the country’s legislative assembly, paving the way for the launch of its bitcoin-backed “volcano” bonds.

First announced one year ago today, the pioneering initiative seeks to attract capital and investors to El Salvador. It was revealed at the time the plans to issue $1 billion in bonds on the Liquid Network, a federated Bitcoin sidechain, with the proceedings of the bonds being split between a $500 million direct allocation to bitcoin and an investment of the same amount in building out energy and bitcoin mining infrastructure in the region.

A sidechain is an independent blockchain that runs parallel to another blockchain, allowing for tokens from that blockchain to be used securely in the sidechain while abiding by a different set of rules, performance requirements, and security mechanisms. Liquid is a sidechain of Bitcoin that allows bitcoin to flow between the Liquid and Bitcoin networks with a two-way peg. A representation of bitcoin used in the Liquid network is referred to as L-BTC. Its verifiably equivalent amount of BTC is managed and secured by the network’s members, called functionaries.

“Digital securities law will enable El Salvador to be the financial center of central and south America,” wrote Paolo Ardoino, CTO of cryptocurrency exchange Bitfinex, on Twitter.

Bitfinex is set to be granted a license in order to be able to process and list the bond issuance in El Salvador.

The bonds will pay a 6.5% yield and enable fast-tracked citizenship for investors. The government will share half the additional gains with investors as a Bitcoin Dividend once the original $500 million has been monetized. These dividends will be dispersed annually using Blockstream’s asset management platform.

The act of submitting the bill, which was hinted at earlier this year, kickstarts the first major milestone before the bonds can see the light of day. The next is getting it approved, which is expected to happen before Christmas, a source close to President Nayib Bukele told Bitcoin Magazine. The bill was submitted on November 17 and presented to the country’s Congress today. It is embedded in full below.

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How I’ll Talk To Family Members About Bitcoin This Thanksgiving

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How I’ll Talk To Family Members About Bitcoin This Thanksgiving

This is an opinion editorial by Joakim Book, a Research Fellow at the American Institute for Economic Research, contributor and copy editor for Bitcoin Magazine and a writer on all things money and financial history.

I don’t.

That’s it. That’s the article.


In all sincerity, that is the full message: Just don’t do it. It’s not worth it.

You’re not an excited teenager anymore, in desperate need of bragging credits or trying out your newfound wisdom. You’re not a preaching priestess with lost souls to save right before some imminent arrival of the day of reckoning. We have time.

Instead: just leave people alone. Seriously. They came to Thanksgiving dinner to relax and rejoice with family, laugh, tell stories and zone out for a day — not to be ambushed with what to them will sound like a deranged rant in some obscure topic they couldn’t care less about. Even if it’s the monetary system, which nobody understands anyway.

Get real.

If you’re not convinced of this Dale Carnegie-esque social approach, and you still naively think that your meager words in between bites can change anybody’s view on anything, here are some more serious reasons for why you don’t talk to friends and family about Bitcoin the protocol — but most certainly not bitcoin, the asset:

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  • Your family and friends don’t want to hear it. Move on.
  • For op-sec reasons, you don’t want to draw unnecessary attention to the fact that you probably have a decent bitcoin stack. Hopefully, family and close friends should be safe enough to confide in, but people talk and that gossip can only hurt you.
  • People find bitcoin interesting only when they’re ready to; everyone gets the price they deserve. Like Gigi says in “21 Lessons:”

“Bitcoin will be understood by you as soon as you are ready, and I also believe that the first fractions of a bitcoin will find you as soon as you are ready to receive them. In essence, everyone will get ₿itcoin at exactly the right time.”

It’s highly unlikely that your uncle or mother-in-law just happens to be at that stage, just when you’re about to sit down for dinner.

  • Unless you can claim youth, old age or extreme poverty, there are very few people who genuinely haven’t heard of bitcoin. That means your evangelizing wouldn’t be preaching to lost, ignorant souls ready to be saved but the tired, huddled and jaded masses who could care less about the discovery that will change their societies more than the internal combustion engine, internet and Big Government combined. Big deal.
  • What is the case, however, is that everyone in your prospective audience has already had a couple of touchpoints and rejected bitcoin for this or that standard FUD. It’s a scam; seems weird; it’s dead; let’s trust the central bankers, who have our best interest at heart.
    No amount of FUD busting changes that impression, because nobody holds uninformed and fringe convictions for rational reasons, reasons that can be flipped by your enthusiastic arguments in-between wiping off cranberry sauce and grabbing another turkey slice.
  • It really is bad form to talk about money — and bitcoin is the best money there is. Be classy.

Now, I’m not saying to never ever talk about Bitcoin. We love to talk Bitcoin — that’s why we go to meetups, join Twitter Spaces, write, code, run nodes, listen to podcasts, attend conferences. People there get something about this monetary rebellion and have opted in to be part of it. Your unsuspecting family members have not; ambushing them with the wonders of multisig, the magically fast Lightning transactions or how they too really need to get on this hype train, like, yesterday, is unlikely to go down well.

However, if in the post-dinner lull on the porch someone comes to you one-on-one, whisky in hand and of an inquisitive mind, that’s a very different story. That’s personal rather than public, and it’s without the time constraints that so usually trouble us. It involves clarifying questions or doubts for somebody who is both expressively curious about the topic and available for the talk. That’s rare — cherish it, and nurture it.

Last year I wrote something about the proper role of political conversations in social settings. Since November was also election month, it’s appropriate to cite here:

“Politics, I’m starting to believe, best belongs in the closet — rebranded and brought out for the specific occasion. Or perhaps the bedroom, with those you most trust, love, and respect. Not in public, not with strangers, not with friends, and most certainly not with other people in your community. Purge it from your being as much as you possibly could, and refuse to let political issues invade the areas of our lives that we cherish; politics and political disagreements don’t belong there, and our lives are too important to let them be ruled by (mostly contrived) political disagreements.”

If anything, those words seem more true today than they even did then. And I posit to you that the same applies for bitcoin.

Everyone has some sort of impression or opinion of bitcoin — and most of them are plain wrong. But there’s nothing people love more than a savior in white armor, riding in to dispel their errors about some thing they are freshly out of fucks for. Just like politics, nobody really cares.

Leave them alone. They will find bitcoin in their own time, just like all of us did.

This is a guest post by Joakim Book. Opinions expressed are entirely their own and do not necessarily reflect those of BTC Inc or Bitcoin Magazine.

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RGB Magic: Client-Side Contracts On Bitcoin

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RGB Magic: Client-Side Contracts On Bitcoin

This is an opinion editorial by Federico Tenga, a long time contributor to Bitcoin projects with experience as start-up founder, consultant and educator.

The term “smart contracts” predates the invention of the blockchain and Bitcoin itself. Its first mention is in a 1994 article by Nick Szabo, who defined smart contracts as a “computerized transaction protocol that executes the terms of a contract.” While by this definition Bitcoin, thanks to its scripting language, supported smart contracts from the very first block, the term was popularized only later by Ethereum promoters, who twisted the original definition as “code that is redundantly executed by all nodes in a global consensus network”

While delegating code execution to a global consensus network has advantages (e.g. it is easy to deploy unowed contracts, such as the popularly automated market makers), this design has one major flaw: lack of scalability (and privacy). If every node in a network must redundantly run the same code, the amount of code that can actually be executed without excessively increasing the cost of running a node (and thus preserving decentralization) remains scarce, meaning that only a small number of contracts can be executed.

But what if we could design a system where the terms of the contract are executed and validated only by the parties involved, rather than by all members of the network? Let us imagine the example of a company that wants to issue shares. Instead of publishing the issuance contract publicly on a global ledger and using that ledger to track all future transfers of ownership, it could simply issue the shares privately and pass to the buyers the right to further transfer them. Then, the right to transfer ownership can be passed on to each new owner as if it were an amendment to the original issuance contract. In this way, each owner can independently verify that the shares he or she received are genuine by reading the original contract and validating that all the history of amendments that moved the shares conform to the rules set forth in the original contract.

This is actually nothing new, it is indeed the same mechanism that was used to transfer property before public registers became popular. In the U.K., for example, it was not compulsory to register a property when its ownership was transferred until the ‘90s. This means that still today over 15% of land in England and Wales is unregistered. If you are buying an unregistered property, instead of checking on a registry if the seller is the true owner, you would have to verify an unbroken chain of ownership going back at least 15 years (a period considered long enough to assume that the seller has sufficient title to the property). In doing so, you must ensure that any transfer of ownership has been carried out correctly and that any mortgages used for previous transactions have been paid off in full. This model has the advantage of improved privacy over ownership, and you do not have to rely on the maintainer of the public land register. On the other hand, it makes the verification of the seller’s ownership much more complicated for the buyer.

Title deed of unregistered real estate propriety

Source: Title deed of unregistered real estate propriety

How can the transfer of unregistered properties be improved? First of all, by making it a digitized process. If there is code that can be run by a computer to verify that all the history of ownership transfers is in compliance with the original contract rules, buying and selling becomes much faster and cheaper.

Secondly, to avoid the risk of the seller double-spending their asset, a system of proof of publication must be implemented. For example, we could implement a rule that every transfer of ownership must be committed on a predefined spot of a well-known newspaper (e.g. put the hash of the transfer of ownership in the upper-right corner of the first page of the New York Times). Since you cannot place the hash of a transfer in the same place twice, this prevents double-spending attempts. However, using a famous newspaper for this purpose has some disadvantages:

  1. You have to buy a lot of newspapers for the verification process. Not very practical.
  2. Each contract needs its own space in the newspaper. Not very scalable.
  3. The newspaper editor can easily censor or, even worse, simulate double-spending by putting a random hash in your slot, making any potential buyer of your asset think it has been sold before, and discouraging them from buying it. Not very trustless.

For these reasons, a better place to post proof of ownership transfers needs to be found. And what better option than the Bitcoin blockchain, an already established trusted public ledger with strong incentives to keep it censorship-resistant and decentralized?

If we use Bitcoin, we should not specify a fixed place in the block where the commitment to transfer ownership must occur (e.g. in the first transaction) because, just like with the editor of the New York Times, the miner could mess with it. A better approach is to place the commitment in a predefined Bitcoin transaction, more specifically in a transaction that originates from an unspent transaction output (UTXO) to which the ownership of the asset to be issued is linked. The link between an asset and a bitcoin UTXO can occur either in the contract that issues the asset or in a subsequent transfer of ownership, each time making the target UTXO the controller of the transferred asset. In this way, we have clearly defined where the obligation to transfer ownership should be (i.e in the Bitcoin transaction originating from a particular UTXO). Anyone running a Bitcoin node can independently verify the commitments and neither the miners nor any other entity are able to censor or interfere with the asset transfer in any way.

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transfer of ownership of utxo

Since on the Bitcoin blockchain we only publish a commitment of an ownership transfer, not the content of the transfer itself, the seller needs a dedicated communication channel to provide the buyer with all the proofs that the ownership transfer is valid. This could be done in a number of ways, potentially even by printing out the proofs and shipping them with a carrier pigeon, which, while a bit impractical, would still do the job. But the best option to avoid the censorship and privacy violations is establish a direct peer-to-peer encrypted communication, which compared to the pigeons also has the advantage of being easy to integrate with a software to verify the proofs received from the counterparty.

This model just described for client-side validated contracts and ownership transfers is exactly what has been implemented with the RGB protocol. With RGB, it is possible to create a contract that defines rights, assigns them to one or more existing bitcoin UTXO and specifies how their ownership can be transferred. The contract can be created starting from a template, called a “schema,” in which the creator of the contract only adjusts the parameters and ownership rights, as is done with traditional legal contracts. Currently, there are two types of schemas in RGB: one for issuing fungible tokens (RGB20) and a second for issuing collectibles (RGB21), but in the future, more schemas can be developed by anyone in a permissionless fashion without requiring changes at the protocol level.

To use a more practical example, an issuer of fungible assets (e.g. company shares, stablecoins, etc.) can use the RGB20 schema template and create a contract defining how many tokens it will issue, the name of the asset and some additional metadata associated with it. It can then define which bitcoin UTXO has the right to transfer ownership of the created tokens and assign other rights to other UTXOs, such as the right to make a secondary issuance or to renominate the asset. Each client receiving tokens created by this contract will be able to verify the content of the Genesis contract and validate that any transfer of ownership in the history of the token received has complied with the rules set out therein.

So what can we do with RGB in practice today? First and foremost, it enables the issuance and the transfer of tokenized assets with better scalability and privacy compared to any existing alternative. On the privacy side, RGB benefits from the fact that all transfer-related data is kept client-side, so a blockchain observer cannot extract any information about the user’s financial activities (it is not even possible to distinguish a bitcoin transaction containing an RGB commitment from a regular one), moreover, the receiver shares with the sender only blinded UTXO (i. e. the hash of the concatenation between the UTXO in which she wish to receive the assets and a random number) instead of the UTXO itself, so it is not possible for the payer to monitor future activities of the receiver. To further increase the privacy of users, RGB also adopts the bulletproof cryptographic mechanism to hide the amounts in the history of asset transfers, so that even future owners of assets have an obfuscated view of the financial behavior of previous holders.

In terms of scalability, RGB offers some advantages as well. First of all, most of the data is kept off-chain, as the blockchain is only used as a commitment layer, reducing the fees that need to be paid and meaning that each client only validates the transfers it is interested in instead of all the activity of a global network. Since an RGB transfer still requires a Bitcoin transaction, the fee saving may seem minimal, but when you start introducing transaction batching they can quickly become massive. Indeed, it is possible to transfer all the tokens (or, more generally, “rights”) associated with a UTXO towards an arbitrary amount of recipients with a single commitment in a single bitcoin transaction. Let’s assume you are a service provider making payouts to several users at once. With RGB, you can commit in a single Bitcoin transaction thousands of transfers to thousands of users requesting different types of assets, making the marginal cost of each single payout absolutely negligible.

Another fee-saving mechanism for issuers of low value assets is that in RGB the issuance of an asset does not require paying fees. This happens because the creation of an issuance contract does not need to be committed on the blockchain. A contract simply defines to which already existing UTXO the newly issued assets will be allocated to. So if you are an artist interested in creating collectible tokens, you can issue as many as you want for free and then only pay the bitcoin transaction fee when a buyer shows up and requests the token to be assigned to their UTXO.

Furthermore, because RGB is built on top of bitcoin transactions, it is also compatible with the Lightning Network. While it is not yet implemented at the time of writing, it will be possible to create asset-specific Lightning channels and route payments through them, similar to how it works with normal Lightning transactions.

Conclusion

RGB is a groundbreaking innovation that opens up to new use cases using a completely new paradigm, but which tools are available to use it? If you want to experiment with the core of the technology itself, you should directly try out the RGB node. If you want to build applications on top of RGB without having to deep dive into the complexity of the protocol, you can use the rgb-lib library, which provides a simple interface for developers. If you just want to try to issue and transfer assets, you can play with Iris Wallet for Android, whose code is also open source on GitHub. If you just want to learn more about RGB you can check out this list of resources.

This is a guest post by Federico Tenga. Opinions expressed are entirely their own and do not necessarily reflect those of BTC Inc or Bitcoin Magazine.

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