We built an ad-free, scam-free, Bitcoin QR Code Generator. Help us stop the scam sites!
I am part of a group spreading the Bitcoin love in Hawaii. We recently gave a talk at the University of Hawaii and gave everyone who attended a paper wallet with 0.10 BTC on it. After the discussion we had to walk several people through how to load the private key. I was wondering if there is a way to create a QR code that will just send money to whoever scans it. Like free money already signed by a private key and just waiting for a public address to complete it. This would make it much easier for participants to get the coins compared to loading a private address (which we created so it's not very secure on their end anyways). I know some of the exchanges do "coupon" codes but is there a way to do this without being tied to a specific service?
Julian Assange was recently arrested violating his civil liberty and hurting the free media all around the world! This is why this t-shirt has been designed and being sold complete with the Bitcoin QR code on the back so that you may skin and donate money to Julian Assange and WikiLeaks! Click it!
06-22 16:42 - 'I live in one of the biggest finance cities in the world. I made these flyers to hang around town. Feel free to reproduce with a QR code/Wallet of your choosing.' (i.redd.it) by /u/CryptoCosmonaut removed from /r/Bitcoin within 0-8min
Stickers with free Bitcoin Tips (QR codes) all around your Town.
Okay, you want your neighborhood know about Bitcoin? Just print QR codes + i.e. Love-Bitcoin Logo on weather-proof laser sticker paper. Put some Cents on each (depending on #stickers and your generosity). Get some friends and do a night of putting those on any corner of your city. It will be a simple runner, because people will recognize the numbers and talk about it, because its worth something, its somehow geeky, its rather unknown... FunFact: watch as people collect the tips on the Blockchain. If you write down the coordinates you can also find out the most active areas. And you can re-collect unclaimed unspend outputs at any time. If you are creative you can utilize BIP38 with some quiz on each sticker. Example: If you put one sticker on EACH gas-streetligth in a city of ~600.000 people you need "only" 3000$ to put 20Ct on each gas-streetlight (numbers from my hometown). Sure, this example is a bit extreme. Just take your local district and place a couple of hundred bucks will have an effect that, if luckily, you can also read in your local newspaper. When I'm going to test it, ill post results here. Maybe we can make a collection and organize this for a certain area together.
I've made few free apps for SW2, QR codes, Bitcoin, easy share
Hi, I have made lately... 1)Bitcoin Widget 2)Easy share - you can paste any text to smartwatch, or share any image, or other content to it 3)QR Codes! You can generate any kind of QR code, and show it on smartwatch, great as a bussines card Hope you will like it. If you have any questions just ask.
Ultimate glossary of crypto currency terms, acronyms and abbreviations
How to make kid-friendly bitcoin QR faucet for Halloween??
The other day I was looking at this article regarding a bitcoin cyber city and the QR code faucet inside the world that gives out 1 satoshi per hour caught my attention. I thought this would be a fucking awesome idea to print on a piece of paper to distribute alongside candy this Halloween! Even kids under 10 have cellphones these days so they'll be able to scan the code pretty quickly and thus have some exposure to bitcoin; and at the very least it will create some sort of dialogue (whether good or bad idgaf). As of right now, it looks like I can make one pretty easily on this site, which I found from my brief adventures in crypto city from the article above. However, that bitcoin QR faucet site ONLY WORKS on the Lightning Network, and when a random cell phone scans the QR code all they get is an incredibly lengthy scramble of numbers and letters. No instructions, no "congratulations you've just received some bitcoin," absolutely fucking no information as to what to do regarding the QR code whatsoever. This is obviously problematic for what I'm looking for. Does anyone know how I could make a bitcoin or ethereum QR code faucet that would actually tell the person using it what was required in order to claim the free crypto dust??? Something simple that a kid might be able to figure out?
This is a follow-up on https://old.reddit.com/Bitcoin/comments/hqzp14/technical_the_path_to_taproot_activation/ Taproot! Everybody wants it!! But... you might ask yourself: sure, everybody else wants it, but why would I, sovereign Bitcoin HODLer, want it? Surely I can be better than everybody else because I swapped XXX fiat for Bitcoin unlike all those nocoiners? And it is important for you to know the reasons why you, o sovereign Bitcoiner, would want Taproot activated. After all, your nodes (or the nodes your wallets use, which if you are SPV, you hopefully can pester to your wallet vendoimplementor about) need to be upgraded in order for Taproot activation to actually succeed instead of becoming a hot sticky mess. First, let's consider some principles of Bitcoin.
You the HODLer should be the one who controls where your money goes. Your keys, your coins.
You the HODLer should be able to coordinate and make contracts with other people regarding your funds.
You the HODLer should be able to do the above without anyone watching over your shoulder and judging you.
I'm sure most of us here would agree that the above are very important principles of Bitcoin and that these are principles we would not be willing to remove. If anything, we would want those principles strengthened (especially the last one, financial privacy, which current Bitcoin is only sporadically strong with: you can get privacy, it just requires effort to do so). So, how does Taproot affect those principles?
Taproot and Your /Coins
Most HODLers probably HODL their coins in singlesig addresses. Sadly, switching to Taproot would do very little for you (it gives a mild discount at spend time, at the cost of a mild increase in fee at receive time (paid by whoever sends to you, so if it's a self-send from a P2PKH or bech32 address, you pay for this); mostly a wash). (technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash, so the Taproot output spends 12 bytes more; spending from a P2WPKH requires revealing a 32-byte public key later, which is not needed with Taproot, and Taproot signatures are about 9 bytes smaller than P2WPKH signatures, but the 32 bytes plus 9 bytes is divided by 4 because of the witness discount, so it saves about 11 bytes; mostly a wash, it increases blockweight by about 1 virtual byte, 4 weight for each Taproot-output-input, compared to P2WPKH-output-input). However, as your HODLings grow in value, you might start wondering if multisignature k-of-n setups might be better for the security of your savings. And it is in multisignature that Taproot starts to give benefits! Taproot switches to using Schnorr signing scheme. Schnorr makes key aggregation -- constructing a single public key from multiple public keys -- almost as trivial as adding numbers together. "Almost" because it involves some fairly advanced math instead of simple boring number adding, but hey when was the last time you added up your grocery list prices by hand huh? With current P2SH and P2WSH multisignature schemes, if you have a 2-of-3 setup, then to spend, you need to provide two different signatures from two different public keys. With Taproot, you can create, using special moon math, a single public key that represents your 2-of-3 setup. Then you just put two of your devices together, have them communicate to each other (this can be done airgapped, in theory, by sending QR codes: the software to do this is not even being built yet, but that's because Taproot hasn't activated yet!), and they will make a single signature to authorize any spend from your 2-of-3 address. That's 73 witness bytes -- 18.25 virtual bytes -- of signatures you save! And if you decide that your current setup with 1-of-1 P2PKH / P2WPKH addresses is just fine as-is: well, that's the whole point of a softfork: backwards-compatibility; you can receive from Taproot users just fine, and once your wallet is updated for Taproot-sending support, you can send to Taproot users just fine as well! (P2WPKH and P2WSH -- SegWit v0 -- addresses start with bc1q; Taproot -- SegWit v1 --- addresses start with bc1p, in case you wanted to know the difference; in bech32 q is 0, p is 1) Now how about HODLers who keep all, or some, of their coins on custodial services? Well, any custodial service worth its salt would be doing at least 2-of-3, or probably something even bigger, like 11-of-15. So your custodial service, if it switched to using Taproot internally, could save a lot more (imagine an 11-of-15 getting reduced from 11 signatures to just 1!), which --- we can only hope! --- should translate to lower fees and better customer service from your custodial service! So I think we can say, very accurately, that the Bitcoin principle --- that YOU are in control of your money --- can only be helped by Taproot (if you are doing multisignature), and, because P2PKH and P2WPKH remain validly-usable addresses in a Taproot future, will not be harmed by Taproot. Its benefit to this principle might be small (it mostly only benefits multisignature users) but since it has no drawbacks with this (i.e. singlesig users can continue to use P2WPKH and P2PKH still) this is still a nice, tidy win! (even singlesig users get a minor benefit, in that multisig users will now reduce their blockchain space footprint, so that fees can be kept low for everybody; so for example even if you have your single set of private keys engraved on titanium plates sealed in an airtight box stored in a safe buried in a desert protected by angry nomads riding giant sandworms because you're the frickin' Kwisatz Haderach, you still gain some benefit from Taproot) And here's the important part: if P2PKH/P2WPKH is working perfectly fine with you and you decide to never use Taproot yourself, Taproot will not affect you detrimentally. First do no harm!
Taproot and Your Contracts
No one is an island, no one lives alone. Give and you shall receive. You know: by trading with other people, you can gain expertise in some obscure little necessity of the world (and greatly increase your productivity in that little field), and then trade the products of your expertise for necessities other people have created, all of you thereby gaining gains from trade. So, contracts, which are basically enforceable agreements that facilitate trading with people who you do not personally know and therefore might not trust. Let's start with a simple example. You want to buy some gewgaws from somebody. But you don't know them personally. The seller wants the money, you want their gewgaws, but because of the lack of trust (you don't know them!! what if they're scammers??) neither of you can benefit from gains from trade. However, suppose both of you know of some entity that both of you trust. That entity can act as a trusted escrow. The entity provides you security: this enables the trade, allowing both of you to get gains from trade. In Bitcoin-land, this can be implemented as a 2-of-3 multisignature. The three signatories in the multisgnature would be you, the gewgaw seller, and the escrow. You put the payment for the gewgaws into this 2-of-3 multisignature address. Now, suppose it turns out neither of you are scammers (whaaaat!). You receive the gewgaws just fine and you're willing to pay up for them. Then you and the gewgaw seller just sign a transaction --- you and the gewgaw seller are 2, sufficient to trigger the 2-of-3 --- that spends from the 2-of-3 address to a singlesig the gewgaw seller wants (or whatever address the gewgaw seller wants). But suppose some problem arises. The seller gave you gawgews instead of gewgaws. Or you decided to keep the gewgaws but not sign the transaction to release the funds to the seller. In either case, the escrow is notified, and if it can sign with you to refund the funds back to you (if the seller was a scammer) or it can sign with the seller to forward the funds to the seller (if you were a scammer). Taproot helps with this: like mentioned above, it allows multisignature setups to produce only one signature, reducing blockchain space usage, and thus making contracts --- which require multiple people, by definition, you don't make contracts with yourself --- is made cheaper (which we hope enables more of these setups to happen for more gains from trade for everyone, also, moon and lambos). (technology-wise, it's easier to make an n-of-n than a k-of-n, making a k-of-n would require a complex setup involving a long ritual with many communication rounds between the n participants, but an n-of-n can be done trivially with some moon math. You can, however, make what is effectively a 2-of-3 by using a three-branch SCRIPT: either 2-of-2 of you and seller, OR 2-of-2 of you and escrow, OR 2-of-2 of escrow and seller. Fortunately, Taproot adds a facility to embed a SCRIPT inside a public key, so you can have a 2-of-2 Taprooted address (between you and seller) with a SCRIPT branch that can instead be spent with 2-of-2 (you + escrow) OR 2-of-2 (seller + escrow), which implements the three-branched SCRIPT above. If neither of you are scammers (hopefully the common case) then you both sign using your keys and never have to contact the escrow, since you are just using the escrow public key without coordinating with them (because n-of-n is trivial but k-of-n requires setup with communication rounds), so in the "best case" where both of you are honest traders, you also get a privacy boost, in that the escrow never learns you have been trading on gewgaws, I mean ewww, gawgews are much better than gewgaws and therefore I now judge you for being a gewgaw enthusiast, you filthy gewgawer).
Taproot and Your Contracts, Part 2: Cryptographic Boogaloo
Now suppose you want to buy some data instead of things. For example, maybe you have some closed-source software in trial mode installed, and want to pay the developer for the full version. You want to pay for an activation code. This can be done, today, by using an HTLC. The developer tells you the hash of the activation code. You pay to an HTLC, paying out to the developer if it reveals the preimage (the activation code), or refunding the money back to you after a pre-agreed timeout. If the developer claims the funds, it has to reveal the preimage, which is the activation code, and you can now activate your software. If the developer does not claim the funds by the timeout, you get refunded. And you can do that, with HTLCs, today. Of course, HTLCs do have problems:
Privacy. Everyone scraping the Bitcoin blockchain can see any HTLCs, and preimages used to claim them.
This can be mitigated by using offchain techniques so HTLCs are never published onchain in the happy case. Lightning would probably in practice be the easiest way to do this offchain. Of course, there are practical limits to what you can pay on Lightning. If you are buying something expensive, then Lightning might not be practical. For example, the "software" you are activating is really the firmware of a car, and what you are buying is not the software really but the car itself (with the activation of the car firmware being equivalent to getting the car keys).
Even offchain techniques need an onchain escape hatch in case of unresponsiveness! This means that, if something bad happens during payment, the HTLC might end up being published onchain anyway, revealing the fact that some special contract occurred.
And an HTLC that is claimed with a preimage onchain will also publicly reveal the preimage onchain. If that preimage is really the activation key of a software than it can now be pirated. If that preimage is really the activation key for your newly-bought cryptographic car --- well, not your keys, not your car!
Trust requirement. You are trusting the developer that it gives you the hash of an actual valid activation key, without any way to validate that the activation key hidden by the hash is actually valid.
Fortunately, with Schnorr (which is enabled by Taproot), we can now use the Scriptless Script constuction by Andrew Poelstra. This Scriptless Script allows a new construction, the PTLC or Pointlocked Timelocked Contract. Instead of hashes and preimages, just replace "hash" with "point" and "preimage" with "scalar". Or as you might know them: "point" is really "public key" and "scalar" is really a "private key". What a PTLC does is that, given a particular public key, the pointlocked branch can be spent only if the spender reveals the private key of the given public key to you. Another nice thing with PTLCs is that they are deniable. What appears onchain is just a single 2-of-2 signature between you and the developemanufacturer. It's like a magic trick. This signature has no special watermarks, it's a perfectly normal signature (the pledge). However, from this signature, plus some datta given to you by the developemanufacturer (known as the adaptor signature) you can derive the private key of a particular public key you both agree on (the turn). Anyone scraping the blockchain will just see signatures that look just like every other signature, and as long as nobody manages to hack you and get a copy of the adaptor signature or the private key, they cannot get the private key behind the public key (point) that the pointlocked branch needs (the prestige). (Just to be clear, the public key you are getting the private key from, is distinct from the public key that the developemanufacturer will use for its funds. The activation key is different from the developer's onchain Bitcoin key, and it is the activation key whose private key you will be learning, not the developer's/manufacturer's onchain Bitcoin key). So:
Privacy: PTLCs are private even if done onchain. Nobody else can learn what the private key behind the public key is, except you who knows the adaptor signature that when combined with the complete onchain signature lets you know what the private key of the activation key is. Somebody scraping the blockchain will not learn the same information even if all PTLCs are done onchain!
Lightning is still useful for reducing onchain use, and will also get PTLCs soon after Taproot is activated, but even if something bad happens and a PTLC has to go onchain, it doesn't reveal anything!
Trust issues can be proven more easily with a public-private keypair than with a hash-preimage pair.
For example, the developer of the software you are buying could provide a signature signing a message saying "unlock access to the full version for 1 day". You can check if feeding this message and signature to the program will indeed unlock full-version access for 1 day. Then you can check if the signature is valid for the purported pubkey whose private key you will pay for. If so, you can now believe that getting the private key (by paying for it in a PTLC) would let you generate any number of "unlock access to the full version for 1 day" message+signatures, which is equivalent to getting full access to the software indefinitely.
For the car, the manufacturer can show that signing a message "start the engine" and feeding the signature to the car's fimrware will indeed start the engine, and maybe even let you have a small test drive. You can then check if the signature is valid for the purported pubkey whose privkey you will pay for. If so, you can now believe that gaining knowledge of the privkey will let you start the car engine at any time you want.
(pedantry: the signatures need to be unique else they could be replayed, this can be done with a challenge-response sequence for the car, where the car gathers entropy somehow (it's a car, it probably has a bunch of sensors nowadays so it can get entropy for free) and uses the gathered entropy to challenge you to sign a random number and only start if you are able to sign the random number; for the software, it could record previous signatures somewhere in the developer's cloud server and refuse to run if you try to replay a previously-seen signature.)
Taproot lets PTLCs exist onchain because they enable Schnorr, which is a requirement of PTLCs / Scriptless Script. (technology-wise, take note that Scriptless Script works only for the "pointlocked" branch of the contract; you need normal Script, or a pre-signed nLockTimed transaction, for the "timelocked" branch. Since Taproot can embed a script, you can have the Taproot pubkey be a 2-of-2 to implement the Scriptless Script "pointlocked" branch, then have a hidden script that lets you recover the funds with an OP_CHECKLOCKTIMEVERIFY after the timeout if the seller does not claim the funds.)
Now if you were really paying attention, you might have noticed this parenthetical:
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash...)
So wait, Taproot uses raw 32-byte public keys, and not public key hashes? Isn't that more quantum-vulnerable?? Well, in theory yes. In practice, they probably are not. It's not that hashes can be broken by quantum computes --- they're still not. Instead, you have to look at how you spend from a P2WPKH/P2PKH pay-to-public-key-hash. When you spend from a P2PKH / P2WPKH, you have to reveal the public key. Then Bitcoin hashes it and checks if this matches with the public-key-hash, and only then actually validates the signature for that public key. So an unconfirmed transaction, floating in the mempools of nodes globally, will show, in plain sight for everyone to see, your public key. (public keys should be public, that's why they're called public keys, LOL) And if quantum computers are fast enough to be of concern, then they are probably fast enough that, in the several minutes to several hours from broadcast to confirmation, they have already cracked the public key that is openly broadcast with your transaction. The owner of the quantum computer can now replace your unconfirmed transaction with one that pays the funds to itself. Even if you did not opt-in RBF, miners are still incentivized to support RBF on RBF-disabled transactions. So the extra hash is not as significant a protection against quantum computers as you might think. Instead, the extra hash-and-compare needed is just extra validation effort. Further, if you have ever, in the past, spent from the address, then there exists already a transaction indelibly stored on the blockchain, openly displaying the public key from which quantum computers can derive the private key. So those are still vulnerable to quantum computers. For the most part, the cryptographers behind Taproot (and Bitcoin Core) are of the opinion that quantum computers capable of cracking Bitcoin pubkeys are unlikely to appear within a decade or two.
Current quantum computers can barely crack prime factorization problem for primes of 5 bits.
The 256-bit elliptic curve use by Bitcoin is, by my (possibly wrong) understanding, equivalent to 4096-bit primes, so you can see a pretty big gap between now (5 bit primes) and what is needed (4096 bit primes).
A lot of financial non-Bitcoin systems use the equivalent of 3072-bit primes or less, and are probably easier targets to crack than the equivalent-to-4096-bit-primes Bitcoin.
Quantum computers capable of cracking Bitcoin are still far off.
Pay-to-public-key-hash is not as protective as you might think.
We will probably see banks get cracked before Bitcoin, so the banking system is a useful canary-in-a-coal-mine to see whether we should panic about being quantum vulnerable.
For now, the homomorphic and linear properties of elliptic curve cryptography provide a lot of benefits --- particularly the linearity property is what enables Scriptless Script and simple multisignature (i.e. multisignatures that are just 1 signature onchain). So it might be a good idea to take advantage of them now while we are still fairly safe against quantum computers. It seems likely that quantum-safe signature schemes are nonlinear (thus losing these advantages).
If you are a singlesig HODL-only Bitcoin user, Taproot will not affect you positively or negatively. Importantly: Taproot does no harm!
If you use or intend to use multisig, Taproot will be a positive for you.
If you transact onchain regularly using typical P2PKH/P2WPKH addresses, you get a minor reduction in feerates since multisig users will likely switch to Taproot to get smaller tx sizes, freeing up blockspace for yours.
If you are using multiparticipant setups for special systems of trade, Taproot will be a positive for you.
Remember: Lightning channels are multipartiicpiant setups for special systems of lightning-fast offchain trades!
I Wanna Be The Taprooter!
So, do you want to help activate Taproot? Here's what you, mister sovereign Bitcoin HODLer, can do!
If you have developer experience especially in C, C++, or related languages
Review the Taproot code! There is one pull request in Bitcoin Core, and one in libsecp256k1. I deliberately am not putting links here, to avoid brigades of nontechnical but enthusiastic people leaving pointless reviews, but if you are qualified you know how to find them!
But I am not a cryptographeBitcoin Core contributomathematician/someone as awesome as Pieter Wuille
That's perfectly fine! The cryptographers have been over the code already and agree the math is right and the implementation is right. What is wanted is the dreary dreary dreary software engineering: are the comments comprehensive and understandable? no misspellings in the comments? variable names understandable? reasonable function naming convention? misleading coding style? off-by-one errors in loops? conditions not covered by tests? accidental mixups of variables with the same types? missing frees? read-before-init? better test coverage of suspicious-looking code? missing or mismatching header guards? portability issues? consistent coding style? you know, stuff any coder with a few years of experience in coding anything might be able to catch. With enough eyes all bugs are shallow!
If you are running a mining pool/mining operation/exchange/custodial service/SPV server
Be prepared to upgrade!
One of the typical issues with upgrading software is that subtle incompatibilities with your current custom programs tend to arise, disrupting operations and potentially losing income due to downtime. If so, consider moving to the two-node setup suggested by gmax, which is in the last section of my previous post. With this, you have an up-to-date "public" node and a fixed-version "private" node, with the public node protecting the private node from any invalid chainsplits or invalid transactions. Moving to this setup from a typical one-node setup should be smooth and should not disrupt operations (too much).
If you are running your own fullnode for fun or for your own wallet
Be prepared to upgrade! The more nodes validating the new rules (even if you are a non-mining node!), the safer every softfork will be!
If you are using an SPV wallet or custodial wallet/service (including hardware wallets using the software of the wallet provider)
Contact your wallet provider / SPV server and ask for a statement on whether they support Taproot, and whether they are prepared to upgrade for Taproot! Make it known to them that Taproot is something you want!
But I Hate Taproot!!
Raise your objections to Taproot now, or forever hold your peace! Maybe you can raise them here and some of the devs (probably nullc, he goes everywhere, even in rbtc!) might be able to see your objections! Or if your objections are very technical, head over to the appropriate pull request and object away!
Maybe you simply misunderstand something, and we can clarify it here!
Or maybe you do have a good objection, and we can make Taproot better by finding a solution for it!
How can I make this "bitcoin geocache" project happen without letting wallets get imported?
I read an article about how people are hiding BCH wallets around San Francisco and had an idea for a cool project. I want to put stickers with private key QR codes around town and allow people to scan them when they find them and sweep the funds into their account. Kind of like some of the existing "bitcoin geocache" projects that are out there. But, I want the wallets to be re-usable, so that once a sticker is found, I can re-fund that wallet for the next lucky person. Sure, someone could keep a picture of the QR code and sweep it regularly, which is fine, but what I am worried about is people importing the wallets and getting notifications any time they are funded and immediately draining them. Is there a way to allow wallet sweeping but prevent someone from importing the wallet into their app? Does anyone see any other viable way I could do this? I'm hoping to fund the project with donations, was thinking I could have a public address and write some script or something to automatically distribute donations to random wallets around town. The idea is to spread awareness and educate locals about crypto by letting them find free money.
I've been using my own bitcoin lightning/full node for about a month now and would like to share my findings as well as ask a few questions to the community. For those that might be curious as to my setup, I am using a Lenovo M900 ThinkCentre with a 1 TB Samsung SSD and 32GB of ram. I'm actually running several VM's on it, for different reasons. One of which is the full Bitcoin/lightning node using Ubuntu Desktop in which I dedicate 8 GB to (more than enough) and most of my disk space to. I wanted a power efficient setup so that I could keep it running 24/7 and this is about as good as it gets short of a Raspberry Pi. When I only have my Bitcoin VM running, I'm consuming ~10 Watts. With everything else running it's ~30 Watts. I bought all of the equipment used (apart from the ram) so it was very cost effective. What I've learned in my experience:
You CAN setup a full Bitcoin (contributing node) and Lightning node to both run over the Tor network WHILE still being able to connect to it remotely from a mobile device on a different network. I've accomplished this using Orbot (Tor) for Android and Zeus - Bitcoin/Lightning Wallet for Android. Connected using lndconnect QR code.
Your node can go offline momentarily or even for days even while you have channels open, and you won't run into issues when you boot it back up from what I've tried. I'll note that I only have 4 channels open at the moment, so don't take this as solid evidence.
Zap desktop wallet is amazing for Linux. I haven't been able to use it on Android with Orbot though.. so I went with Zeus for this reason. It's also very good on mobile.
Payments are easy to make once everything is setup. I've purchased some goods, donated to Johoe's Bitcoin Mempool (I use that site all the time. Big help), and bought some eGift cards annonomously.
Is it possible to close a channel (while the peer is online and the channel is online, not force closing) with a custom fee set? All of the channels I opened so far were opened using 1 sat per byte (lncli openchannel amount --sat_per_byte 1). This usually takes more than a day to open, but only costs about $0.02 to open. When I try to close a channel in a similar fasion (lncli closechannel --sat_per_byte 1
How dangerous is it to go offline for longer periods of time (say a week or month) with open channels? If I was to go back online after, is it possible that I might unintentionally broadcast an old channel state causing a loss of funds on my part?
Is there a method of determining a connected peer nodes uptime history before opening a channel with them to prevent having to force close a channel due to their node going offline for a long period of time, thus having to pay high fees (Commit Fee) to force close?
Is there a way to show transaction fees for lightning payments BEFORE they are paid? I had to pay over 100 satoshis once to send a lightning payment and there was no way of checking the transaction fee before the payment was sent out. Is there anything stopping people from charging say, 100000 satoshis to route a payment through their node without the user knowing beforehand?
Any info would be appreciated. If anybody has any question that they would like to ask me, feel free to ask!
How to buy Bitcoin and Deposit on Roobet Full Tutorial
Hello! In this thread I will do my very best to explain how to purchase Bitcoin safely and deposit it onto Roobet.com ! If anything is too confusing or you need further instructions feel free to message a mod for help!Be very aware of other users offering to sell you bitcoin or purchase on your behalf.If you are new to Bitcoin in general I strongly recommend watching this quick video on the basics of bitcoin safety https://www.youtube.com/watch?v=2z2xggmeW1AAfter you have watched that or you already understand bitcoin skip to down below! Buying Bitcoin Step 1 Chosing an exchange Ok so you want to buy bitcoin to play on roobet? No problem! Bitcoin is super easy to use once you understand it! The first thing you need to do is pick an exchange to purchase from. I would recommendcoinbaseas it is a very large and trusted exchange.If coinbase does not work in your region then I would recommendBinance The last option if buying online doesn't work would be a local Bitcoin ATM use google to find one close to you. Step 2 Signing up -coinbase Sign up using https://www.coinbase.com/join/carava_zo to get a bonus 10$ btc on your first purchase Once you create an account you will be prompt to verify both a Email & Phone Number *Sometimes a photo id is required* *(It is recommend to add one as it will improve account security and increase your buying limit)* Follow the on screen prompts until you get to Add Payment Method Add your method of payment Once you link a Bank/Credit Card you will now be in the main page https://preview.redd.it/a58hftutv8d51.png?width=1892&format=png&auto=webp&s=9ce87ba198fdcaad10a2da4725c1030fca4d1741
Copy the Bitcoin Address (Your bitcoin address not the one in the screenshot)
Head back to coinbase
You should still have the Sent/Receive tab open if not open it back up
Put in the amount of BTC you wish to send
I like to add a note to keep my purchases organized this is optional
PASTE THE ROOBET DEPOSIT ADDRESS WE COPIED FROM STEP 1
DOUBLE TRIPLE QUADRUPLE CHECK THE ADDRESS IS CORRECT YOU ONLY GET 1 SHOT AT THIS GO SLOW
If everything looks good click send
TRIPLE CHECK BEFORE CLICKING SEND You will be given a confirmation screen again take note of the fees It is easy to get confused especially with currency conversion its always best to look at the BTC amount not the $ amount. (pro tip) Last chance to check everything Once you confirmed everything click send and the BTC is on its way! Go back to roobet and keep an eye on your notifications. Thanks to Roobet Instant funding you only need 1 confirmation before your funds are ready to go! https://preview.redd.it/14x2wwmo59d51.png?width=524&format=png&auto=webp&s=d40212fd1b67555fecb6e7f69c78d47c1abe569f Thats it!!!!You have successfully purchased and added BTC to your roobet account! Things to note Bitcoin is risky be safe take time to learn it Gambling is risky... Crpto is risky this website combines both please take the appropriate steps to ensure not only your financial safety but also your metal health Play Smart Play Safe Thank you for reading!if this helped you at all I would love it if you used my links above when signing up This was my first reddit guide I apologize if it is messy/confusing I will work on the formatting any Feedback is appreciated -Dom
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This is how I've been doing things in my Digital Perdition chronicle / narrative for Shadowrun for years. If this is useful, feel free to steal it. I assume this probably isn't a new idea, but in my world, Nuyen is a form of cryptocurrency, like bitcoin or ethereum. It's also a "smart" currency, in that it can autonomously do things, all by itself. Any "nuyen app" on any comlink can, with a very simple user-facing interface, create things like escrows, trusts, provisional holdings, task verified transactions, etc. As long as the system can autonomously verify the information some how in the outside world, it can interact with it. (This also means the system is somewhat fallible and can be hacked / spoofed / fooled, which can lead to interesting emergent narratives / plots all on its own). The fact that it's a cryptocurrency also informs the logic of what happens if Nuyen is copied. Ordinarily, this doesn't happen, and "naked nuyen" (nucoin outside of a wallet app or not encrypted on a credstick) is very suspicious, and if you're going to accept it, you need to be able to verrify it in real time, like right now, and transfer it to your account before you leave this dark alley / a abandoned warehouse transaction, or not accept it at all if you don't have signal. But if you do some how manage to clone some Nuyen, then just like crypto, and there's two of the exact same nucoin, then it's whoever syncs it to their account first. The other is considered the forgery. So that can create a "race against the clock" scenario if two opposing forces have the bag, the same bag, and need to get back to civilization before the other guy does. (This might not even come up in your games, but I play in a lot of areas like, in the middle of the ocean, pirates and atolls, as well as extremely rural northern Canada, South American jungles, and sub-Saharian Africa, exploring ancient blood mage / cultist desert ruins, etc, so often, "spotty signal" is an environmental hurdle / plot point.) We also have "credcoins" in addition to regular old credsticks. A "credcoin" is basically like an SD card, but with a poker-chip style plastic housing around it, to make it more handleable. The chip holds the actual encrypted nucoin (like a credstick) so they're not naked nuyen (see above), but they've also got an optical code, like a QR code, printed on them. They can be used in vending machines in 3rd world areas where signal might be spotty, or traded in physical transactions. The way they work, is that we've written into the narrative that a certain block of numbers in the "nuyen hash" of each nucoin, maybe like the last five digits or something, who knows, but that there's a world wide industry standard number to indicate that these nuyen are dedicated for physical use. Sort of like how some IP addresses are reserved for localhost or LAN. If any system, any wallet app, sees these digits, it wont let them be "deposited". Only a physical bank can do it. This prevents someone from just scanning a credcoin, depositing the nuyen, and now the coins still look valid, but are useless. If you wanted to "deposit" them, you'd take them to a bank, they would scan them and verify, add them to your account, and remove those coins from circulation immediately by physically destroying them (or feeding them into a hopper to be able to 3d print new ones). They'd also charge you a fee for the overhead of the cost of actually producing currency, sort of like those CoinStar machines at Walmart that charge you a fee for counting all your change. Speaking of counting change... That there's an optical code on credcoins makes that easy, too. Anyone with AR (augmented reality -- so basically, anyone, even if it's only through a hand held comlink screen, but usually AR contact lenses, glasses, goggles, or cybereyes) can just look at a credcoin and immediately know how much it is. You can also dump them out on the table, stand back so you get them all in frame, and just see a total for how much the value of all of them are. Each credcoin already has an ARO, but if there's a shit load of them together in close proximity, the AROs just merge together into a single one so as not to be "spammy". If you want to block the AROs, you can store your credcoins in signal blocking bags, containers, or metal coin rolls. Credcoins are also slightly different sizes and colors to tell the denomination at a glance, as well. Anyway, I hope some of those ideas are useful for your games. :)
Is there a website where I can put all my crypto addresses where people can send me money?
Surely this has to exist by now, but I googled around for 5-10 min and couldn't find anything. I'm looking for a site where users can create a single landing page where they show the methods of payment that they accept, for example Bitcoin and Paypal. Ideally, it would support: - All major cryptocurrencies (e.g. Bitcoin) - All major fiat apps (e.g. PayPal) - QR codes - Custom url for sharing Please drop the link if you know of a site where I can do this! Thanks! UPDATE: I created a free open-source app to do this. It's live! https://Coindrop.to
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