A Bitcoin address, or simply address, is an identifier of 26-35 alphanumeric characters, beginning with the number 1 or 3 , that represents a possible destination for a bitcoin payment. Addresses can be generated at no cost by any user of Bitcoin. For example, using Bitcoin Core, one can click "New Address" and be assigned an address. It is also possible to get a Bitcoin address using an account at an exchange or online wallet service.
There are currently three address formats in use:
- P2PKH which begin with the number 1 , eg: 1BvBMSEYstWetqTFn5Au4m4GFg7xJaNVN2 .
- P2SH type starting with the number 3 , eg: 3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy .
- Bech32 type starting with bc1 , eg: bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq .
A Bitcoin address is a single-use token
Like e-mail addresses, you can send bitcoins to a person by sending bitcoins to one of their addresses. However, unlike e-mail addresses, people have many different Bitcoin addresses and a unique address should be used for each transaction. Most Bitcoin software and websites will help with this by generating a brand new address each time you create an invoice or payment request.
Addresses can be created offline
Creating addresses can be done without an Internet connection and does not require any contact or registration with the Bitcoin network. It is possible to create large batches of addresses offline using freely available software tools. Generating batches of addresses is useful in several scenarios, such as e-commerce websites where a unique pre-generated address is dispensed to each customer who chooses a "pay with Bitcoin" option. Newer "HD wallets" can generate a "seed" token which can be used to allow untrusted systems (such as webservers) to generate an unlimited number of addresses without the ability to spend the bitcoins received.
Addresses are often case sensitive and exact
Old-style Bitcoin addresses are case-sensitive. Bitcoin addresses should be copied and pasted using the computer's clipboard wherever possible. If you hand-key a Bitcoin address, and each character is not transcribed exactly - including capitalization - the incorrect address will most likely be rejected by the Bitcoin software. You will have to check your entry and try again.
The probability that a mistyped address is accepted as being valid is 1 in 2 32 , that is, approximately 1 in 4.29 billion.
New-style bech32 addresses are case insensitive.
Proving you receive with an address
Most Bitcoin wallets have a function to "sign" a message, proving the entity receiving funds with an address has agreed to the message. This can be used to, for example, finalise a contract in a cryptographically provable way prior to making payment for it.
Some services will also piggy-back on this capability by dedicating a specific address for authentication only, in which case the address should never be used for actual Bitcoin transactions. When you login to or use their service, you will provide a signature proving you are the same person with the pre-negotiated address.
It is important to note that these signatures only prove one receives with an address. Since Bitcoin transactions do not have a "from" address, you cannot prove you are the sender of funds.
Current standards for message signatures are only compatible with "version zero" bitcoin addresses (that begin with the number 1).
Address validation
If you would like to validate a Bitcoin address in an application, it is advisable to use a method from this thread rather than to just check for string length, allowed characters, or that the address starts with a 1 or 3. Validation may also be done using open source code available in various languages or with an online validating tool.
Multi-signature addresses
Addresses can be created that require a combination of multiple private keys. Since these take advantage of newer features, they begin with the newer prefix of 3 instead of the older 1. These can be thought of as the equivalent of writing a check to two parties - "pay to the order of somebody AND somebody else" - where both parties must endorse the check in order to receive the funds.
The actual requirement (number of private keys needed, their corresponding public keys, etc.) that must be satisfied to spend the funds is decided in advance by the person generating this type of address, and once an address is created, the requirement cannot be changed without generating a new address.
What's in an address
Most Bitcoin addresses are 34 characters. They consist of random digits and uppercase and lowercase letters, with the exception that the uppercase letter "O", uppercase letter "I", lowercase letter "l", and the number "0" are never used to prevent visual ambiguity.
Some Bitcoin addresses can be shorter than 34 characters (as few as 26) and still be valid. A significant percentage of Bitcoin addresses are only 33 characters, and some addresses may be even shorter. Every Bitcoin address stands for a number. These shorter addresses are valid simply because they stand for numbers that happen to start with zeroes, and when the zeroes are omitted, the encoded address gets shorter.
Several of the characters inside a Bitcoin address are used as a checksum so that typographical errors can be automatically found and rejected. The checksum also allows Bitcoin software to confirm that a 33-character (or shorter) address is in fact valid and isn't simply an address with a missing character.
Addresses on the Bitcoin Testnet are generated with a different address version, which results in a different prefix. See List of address prefixes and Testnet for more details.
Misconceptions
Address reuse
Addresses are not intended to be used more than once, and doing so has numerous problems associated. See the dedicated article on address reuse for more details.
Address balances
Addresses are not wallets nor accounts, and do not carry balances. They only receive funds, and you do not send "from" an address at any time. Various confusing services and software display bitcoins received with an address, minus bitcoins sent in random unrelated transactions as an "address balance", but this number is not meaningful: it does not imply the recipient of the bitcoins sent to the address has spent them, nor that they still have the bitcoins received.
An example of bitcoin loss resulting from this misunderstanding is when people believed their address contained 3btc. They spent 0.5btc and believed the address now contained 2.5btc when actually it contained zero. The remaining 2.5btc was transferred to a change address which was not backed up and therefore lost. This has happened on a few occasions to users of Paper wallets.
"From" addresses
Bitcoin transactions do not have any kind of origin-, source- or "from" address. See the dedicated article on "from address" for more details.
What is my BTC address?
No, Ethereum addresses are not case sensitive.
Released as an open-source software in 2009, BTC (or Bitcoin) is often credited as the world’s first cryptocurrency and is best defined as a digital currency that only exists electronically.
You can get a BTC address by either: signing up on an exchange, using an online wallet, or purchasing a hardware wallet.
What is my BTC address?
Your BTC address is a string of 26-35 letters and numbers that identify your Bitcoin wallet. BTC addresses begin with either a 1 or a 3 and are case-sensitive.
When you want to receive funds, this is the information that you provide to the person paying you. Your BTC address is oftentimes called your wallet address or your public address.
This address is considered public because, unlike the private key that controls your wallet, it’s relatively safe to share with the public.
Most wallets make your BTC address readily accessible. You can usually find your address by tapping “Receive” or “Receive BTC” in your wallet. Some wallets also have it listed in your account settings.
How to get a BTC address
There’s no shortage of ways to get a BTC address. The 3 most popular methods are:
- Setting up an account on an exchange
- Using an online wallet
- Using an offline wallet (recommended)
Most exchanges give you a BTC address when you create an account. You don’t need to do any trading to have access to your public address.
Although convenient, it’s not recommended that you use this address for anything more than temporary storage. Exchanges are online which puts your funds at risk for hackers and/or malicious software.
Online wallets
There’s plenty of reputable online wallets that you can use to get a BTC address. Exodus and Jaxx are two solid options that not only support Bitcoin but other coins as well.
Coinbase, although known primarily as an exchange, also provides you with a wallet when you use their service.
Once again, there’s an inherent risk in using these platforms because they’re online.
Offline wallets
Offline wallets are the suggested way to get an address to store your Bitcoin. You can either use a hardware wallet like Trezor and Ledger or create a paper wallet for your funds. Because these wallets are offline, you mitigate the risk of being hacked by using them.
Hardware wallets are the most expensive option, but their security and multiple coin support usually make them worth the higher price tag.
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What is a Bitcoin Address and How Do You Sign It?
Short Answer: A Bitcoin address is a unique number that “holds” bitcoin currency. You use the address to receive and send bitcoins.
Medium Sized Answer: A Bitcoin address is the public key half of the public-private key pair that enables the validation of ownership of that address. WHOAH there, what in tarnation does that mean??
Bitcoin addresses are created as part of a key generation process that creates a pair of keys. They are a matched set, where one is public and the other is private. When you “sign” a bitcoin address you are running the public and private keys through an algorithm that checks to see that those keys belong together. Usually signing is talked about in the context of a message. Someone sends you a signed message and you can verify that the message came from the genuine person. You can verify the message because it was signed with their private key and you match it to their public key. When sending bitcoins the signed message is a portion of the bitcoin transaction and you do not explicitly see the message, it is just part of the transaction. This lets you validate the ownership of the address. The transaction (the transfer of value) was signed with the owner’s private key and you check that it’s valid using their public key.
A little diversion – public key cryptography is a really cool technology developed in the mid 1970’s. The amazing thing about public-private key pairs is that everyone can know the public key and the owner of the private key can prove that he is the owner of the message sent with the associated public key. For more information on PKI (Public Key Infrastructure) upon which much of bitcoin’s security is based see Mike Hearn’s (a core bitcoin developer) great description of many issues in “Why you think the PKI sucks…but can’t do any better“.
A Longer Story: Let look at the sequence of actions to create and then use the key pairs. First we need to generate the key pair, which will result in two keys the public and private keys. The Bitcoin address is actually a form of the public key (it’s a hash of the public key). From the Bitcoin protocol specification at: https://en.bitcoin.it/wiki/Protocol_specification#Signatures
A bitcoin address is in fact the hash of a ECDSA public key
Btc adresse
Help, I Just Sent Bitcoin Cash to a BTC Address! Can I Get It Back?
September 20, 2017 by Evan Faggart 171 Comments 11625 Views
Last week, Bitcoiners were surprised to find out about an entirely new way they could potentially throw their money away forever. As it turns out, those using the forked Bitcoin Cash (BCC) coin can actually send their coins to a Bitcoin (BTC) address, leaving their money at the mercy of whoever controls the BTC private keys.
Crossing Paths: Accidentally Sending Bitcoin Cash to a Bitcoin Address
Vice’s Motherboard put this issue in the spotlight last week when it published a report of Reddit users discussing their mistake of sending BCC to a BTC address and trying to get their coins back.
However, even experienced Bitcoiners can make this mistake using any kind of wallet — not just a hardware storage device.
Bitsonline editor Jon Southurst witnessed this first hand when testing a BCC wallet out with an acquaintance, who wished to remain unnamed in this article.
Jon sent a BCC payment to his friend, who had unknowingly given him a BTC address. Jon’s friend was using Bitcoin.com’s mobile app, which toggles between BTC and BCC wallets. He didn’t realize he was on the BTC screen at that moment, and accidentally created a receive address for BTC instead of BCC.
“Yes, I gave my Bitcoin (BTC) receiving address instead of Bitcoin Cash [BCC] to Jon by mistake,” Jon’s acquaintance told Bitsonline.
“So, I now have to figure out how to retrieve my [BCC] in my Bitcoin.com wallet.”
Real World Implications?
So, we know it’s possible to send BCC to the wrong address by accident, and our source proved that it’s an easy enough mistake to make. But what are the odds that someone will make this slip-up in the real world?
Jon said it’s actually pretty easy to make this mistake in the real world.
“Way too easy in fact. The wallets available now have BTC and BCC balances, so you have to switch between them yourself. They’re identical in format, and the app doesn’t always make it obvious which one you’re using.”
Lending to Jon’s statement, our anonymous source told us that he had actually sent BCC to a BTC address once before — in the real world.
“I sent my Bitcoin Cash to [a] Bitcoin address in an exchange, and I had to reach out to them to retrieve it,” our source said.
BCC Developer: Receiver ‘Can Do Anything’ With Keys They Control
And when you accidentally send your BCC to the wrong address, you’re really at the mercy of whoever controls the private keys, making this a potentially dangerous BCC flaw.
Some may be charitable and helpful in helping to retrieve your coins. However others won’t be — perhaps they’re inundated with similar requests, or it’s against their policy. Or they have a nice racket scooping up accidental BCC for themselves.
According to BCC lead developer Amaury Sechet, whoever controls the private key to the address you sent your coins to can “do anything with them, really,” all they need to do is import the private keys to that address into a software that supports BCC — then they have full control over your coins.
Essentially, if you send your BCC to a BTC address you don’t control, all you can do is hope the recipient is trustworthy. And as Bitcoiners have learned time and again, trustworthiness is in short order when it comes to cryptocurrency.
Prevention the Only Reliable Option, so Be Careful
So how can you prevent yourself from making this mistake? At this point, all you can really do is be extremely careful when sending a BCC payment: pay close attention to the recipient address.
“Maybe for the short term at least, they could put a warning, use a different color, or just make the currency symbol more prominent. It’s going to be a big problem if even experienced users are making the mistake.”
Sechet told Bitsonline that he and his fellow developers understand the difficulty created by this flaw, and have heard the community’s calls for a solution.
“We recognize this is an inconvenience for users and businesses,” Sechet said, “we are actively working on a new address format that will be incompatible with BTC addresses.”
Until then, be careful with your Bitcoin Cash.
Have you ever sent coins to the wrong address? What did you do?
US Search Mobile Web
Welcome to the Yahoo Search forum! We’d love to hear your ideas on how to improve Yahoo Search.
The Yahoo product feedback forum now requires a valid Yahoo ID and password to participate.
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Your search engine does not find any satisfactory results for searches. It is too weak. Also, the server of bing is often off
I created a yahoo/email account long ago but I lost access to it; can y'all delete all my yahoo/yahoo account except for my newest YaAccount
I want all my lost access yahoo account 'delete'; Requesting supporter for these old account deletion; 'except' my Newest yahoo account this Account don't delete! Because I don't want it interfering my online 'gamble' /games/business/data/ Activity , because the computer/security program might 'scure' my Information and detect theres other account; then secure online activities/ business securing from my suspicion because of my other account existing will make the security program be 'Suspicious' until I'm 'secure'; and if I'm gambling online 'Depositing' then I need those account 'delete' because the insecurity 'Suspicioun' will program the casino game 'Programs' securities' to be 'secure' then it'll be 'unfair' gaming and I'll lose because of the insecurity can be a 'Excuse'. Hope y'all understand my explanation!
I want all my lost access yahoo account 'delete'; Requesting supporter for these old account deletion; 'except' my Newest yahoo account this Account don't delete! Because I don't want it interfering my online 'gamble' /games/business/data/ Activity , because the computer/security program might 'scure' my Information and detect theres other account; then secure online activities/ business securing from my suspicion because of my other account existing will make the security program be 'Suspicious' until I'm 'secure'; and if I'm gambling online 'Depositing' then I need those account 'delete' because the insecurity 'Suspicioun' will program the casino game 'Programs' securities' to be… more
chithidio@Yahoo.com
i dont know what happened but i can not search anything.
Golf handicap tracker, why can't I get to it?
Why do I get redirected on pc and mobile device?
Rahyaftco@yahoo.com
RYAN RAHSAD BELL literally means
Question on a link
In the search for Anaïs Nin, one of the first few links shows a picture of a man. Why? Since Nin is a woman, I can’t figure out why. Can you show some reason for this? Who is he? If you click on the picture a group of pictures of Nin and no mention of that man. Is it an error?
Repair the Yahoo Search App.
Yahoo Search App from the Google Play Store on my Samsung Galaxy S8+ phone stopped working on May 18, 2018.
I went to the Yahoo Troubleshooting page but the article that said to do a certain 8 steps to fix the problem with Yahoo Services not working and how to fix the problem. Of course they didn't work.
I contacted Samsung thru their Samsung Tutor app on my phone. I gave their Technican access to my phone to see if there was a problem with my phone that stopped the Yahoo Search App from working. He went to Yahoo and I signed in so he could try to fix the Yahoo Search App not working. He also used another phone, installed the app from the Google Play Store to see if the app would do any kind of search thru the app. The Yahoo Search App just wasn't working.
I also had At&t try to help me because I have UVERSE for my internet service. My internet was working perfectly. Their Technical Support team member checked the Yahoo Search App and it wouldn't work for him either.
We can go to www.yahoo.com and search for any topic or website. It's just the Yahoo Search App that won't allow anyone to do web searches at all.
I let Google know that the Yahoo Search App installed from their Google Play Store had completely stopped working on May 18, 2018.
I told them that Yahoo has made sure that their Yahoo members can't contact them about anything.
I noticed that right after I accepted the agreement that said Oath had joined with Verizon I started having the problem with the Yahoo Search App.
No matter what I search for or website thru the Yahoo Search App it says the following after I searched for
www.att.com.
WEBPAGE NOT AVAILABLE
This webpage at gttp://r.search.yahoo.com/_ylt=A0geJGq8BbkrgALEMMITE5jylu=X3oDMTEzcTjdWsyBGNvbG8DYmyxBHBvcwMxBHZ0aWQDTkFQUEMwxzEEc2VjA3NylRo=10/Ru=https%3a%2f%2fwww.att.att.com%2f/Rk=2/Es=plkGNRAB61_XKqFjTEN7J8cXA-
could not be loaded because:
net::ERR_CLEARTEXT_NOT_PERMITTED
I tried to search for things like www.homedepot.com. The same thing happened. It would say WEBPAGE NOT AVAILABLE. The only thing that changed were all the upper and lower case letters, numbers and symbols.
Then it would again say
could not be loaded because:
net::ERR_CLEARTEXT_NOT_PERMITTED
This is the same thing that happened when Samsung and At&t tried to do any kind of searches thru the Yahoo Search App.
Yahoo needs to fix the problem with their app.
Yahoo Search App from the Google Play Store on my Samsung Galaxy S8+ phone stopped working on May 18, 2018.
I went to the Yahoo Troubleshooting page but the article that said to do a certain 8 steps to fix the problem with Yahoo Services not working and how to fix the problem. Of course they didn't work.
I contacted Samsung thru their Samsung Tutor app on my phone. I gave their Technican access to my phone to see if there was a problem with my phone that stopped the Yahoo Search App from working. He went to Yahoo and… more
Btc adresse
Saint Bitts LLC.
This is our official Bitcoin.com sales address: 1AHY8puC5G7jqfQS53ufbmCMHYWPpMLfRW
Please send only bitcoin to the above address in order to prevent phishing attempts.
Bitcoin is one of the most important inventions in all of human history.
For the first time ever, anyone can send or receive any amount of money with anyone else, anywhere on the planet, conveniently and without restriction.
It’s the dawn of a better, more free world.
What is a Bitcoin Address and How Do You Sign It?
Short Answer: A Bitcoin address is a unique number that “holds” bitcoin currency. You use the address to receive and send bitcoins.
Medium Sized Answer: A Bitcoin address is the public key half of the public-private key pair that enables the validation of ownership of that address. WHOAH there, what in tarnation does that mean??
Bitcoin addresses are created as part of a key generation process that creates a pair of keys. They are a matched set, where one is public and the other is private. When you “sign” a bitcoin address you are running the public and private keys through an algorithm that checks to see that those keys belong together. Usually signing is talked about in the context of a message. Someone sends you a signed message and you can verify that the message came from the genuine person. You can verify the message because it was signed with their private key and you match it to their public key. When sending bitcoins the signed message is a portion of the bitcoin transaction and you do not explicitly see the message, it is just part of the transaction. This lets you validate the ownership of the address. The transaction (the transfer of value) was signed with the owner’s private key and you check that it’s valid using their public key.
A little diversion – public key cryptography is a really cool technology developed in the mid 1970’s. The amazing thing about public-private key pairs is that everyone can know the public key and the owner of the private key can prove that he is the owner of the message sent with the associated public key. For more information on PKI (Public Key Infrastructure) upon which much of bitcoin’s security is based see Mike Hearn’s (a core bitcoin developer) great description of many issues in “Why you think the PKI sucks…but can’t do any better“.
A Longer Story: Let look at the sequence of actions to create and then use the key pairs. First we need to generate the key pair, which will result in two keys the public and private keys. The Bitcoin address is actually a form of the public key (it’s a hash of the public key). From the Bitcoin protocol specification at: https://en.bitcoin.it/wiki/Protocol_specification#Signatures
A bitcoin address is in fact the hash of a ECDSA public key
BitRef will help you view the current balance of any Bitcoin address. You need only a device with the Internet and a valid Bitcoin address string. This is a safe service because it uses only public data; there is no need for login and password.
It is possible to monitor many Bitcoin addresses with one request. Just separate the different addresses with a "+" (plus) sign in the address field or in the URL. This way you can enter all your wallet addresses and monitor the entire wallet.
The tool shows the last 50 transactions for every address (or combination of addresses). It shows the date, amount and current balance for every transaction. You can also check the number of confirmations by keeping the mouse pointer over each transaction.
We have a browser extension for Chrome, Firefox and Opera. With the extension you can check Bitcoin address balance by just typing: "btc
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