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#COLDCARD Firmware Update # Shared Mk4 & Q New Features: 📳 PushTX: once enabled with a service provider's URL, you can tap the COLDCARD and your phone will open a webpage that transmits your freshly-signed transaction onto the blockchain. See Settings > NFC Push Tx to enable and select...

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COLDCARD

67,997 subscribers

211,674 просмотров • 2 лет назад •via X (Twitter)

ФинансыНаука и технологии#COLDCARD
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Комментарии: 10

Фото профиля COLDCARD
COLDCARD2 лет назад

Full post - Firmware Upgrade - PushTX spec - Our telegram community - Full demo video

Фото профиля I)ruid
I)ruid2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite Can it not just send through Tor? Why the need for a broadcast "service provider"?

Фото профиля Hodlingbtc
Hodlingbtc2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite Appreciate all you do but why is explanation of new functionality never in English? I know intuitively that these upgrades will improve my user experience but I tend to ignore them because the descriptions are overwhelming and don't really tell me why they are important for me

Фото профиля COLDCARD
COLDCARD2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite We are nerds. Trying to improve comms. We have an open position :)

Фото профиля Meat Mech Architect
Meat Mech Architect2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite Okay, I’m getting one of these. As soon as I have income again.

Фото профиля BTCMAT
BTCMAT2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite Will this work with nunchuk?

Фото профиля COLDCARD
COLDCARD2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite ANY wallet.

Фото профиля SF Hodl
SF Hodl2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite Wow wow wow! PS - I've never been able to scan PSBT QRs from Sparrow. Is that supported?

Фото профиля Mountain_HODL
Mountain_HODL2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite On a new Coldcard Q, should firmware be updated prior to seed generation?

Фото профиля Stefan K - e/acc
Stefan K - e/acc2 лет назад

@SparrowWallet @mempool @nunchuk_io @Coinkite I like COLDCARD, even tho it requires some level of trust, because not everyone has the time or expertise to verify everything. If you're interested in a more minimalistic approach, please check out my project.

Похожие видео

#COLDCARD Firmware Release 1.3.4Q & 5.4.4Mk4 🍄⏫ 🔐 Single-Sig Spending Policies & 📱2FA! You can now reconfigure your existing COLDCARD with a policy📑, so it will refuse to sign transactions that are too large, too frequent, or sent to an address not on your whitelist 1/3
0:57

#COLDCARD Firmware Release 1.3.4Q & 5.4.4Mk4 🍄⏫ 🔐 Single-Sig Spending Policies & 📱2FA! You can now reconfigure your existing COLDCARD with a policy📑, so it will refuse to sign transactions that are too large, too frequent, or sent to an address not on your whitelist 1/3

COLDCARD

111,310 просмотров • 1 год назад

It’s never been easier to broadcast a transaction. PushTX lets you broadcast signed transactions directly from your device using NFC. Just tap and broadcast.
0:25

It’s never been easier to broadcast a transaction. PushTX lets you broadcast signed transactions directly from your device using NFC. Just tap and broadcast.

COLDCARD

14,382 просмотров • 5 месяцев назад

I built a wallet app that sends sBTC using bitcoin addresses instead of Stacks addresses. That's layer 2 sats sent from bitcoin address to bitcoin address in seconds for < $0.01 via the Stacks network: ✅Standard bitcoin addresses ✅Standard sign and broadcast semantics ✅Confirmation in seconds ✅Low fees ✅Self-custody ✅Bitcoin finality While this wallet is a prototype that works only with native Segwit addresses and requires or Leather - Grow your Bitcoin for transaction signing, Bitcoin addresses for sBTC (or all Stacks assets) could be adopted natively by any wallets. It doesn't require any changes to the Stacks core network. This address scheme could even be expanded so that fast, easy and cheap layer 2 BTC transactions could also work with legacy addresses. Here's how it works: Bitcoin legacy and native segwit addresses along with Stacks addresses all encode the so-called "hash160" of the user's public key. This means we can convert these two types of bitcoin addresses into a Stacks address and any Stacks address into either a legacy or native segwit bitcoin address. Using bitcoin addresses instead of Stacks addresses allows us to reuse many of the payment standards and QR code formats that have already been developed for bitcoin. It makes sBTC a true layer 2 bitcoin.
6:33

I built a wallet app that sends sBTC using bitcoin addresses instead of Stacks addresses. That's layer 2 sats sent from bitcoin address to bitcoin address in seconds for < $0.01 via the Stacks network: ✅Standard bitcoin addresses ✅Standard sign and broadcast semantics ✅Confirmation in seconds ✅Low fees ✅Self-custody ✅Bitcoin finality While this wallet is a prototype that works only with native Segwit addresses and requires or Leather - Grow your Bitcoin for transaction signing, Bitcoin addresses for sBTC (or all Stacks assets) could be adopted natively by any wallets. It doesn't require any changes to the Stacks core network. This address scheme could even be expanded so that fast, easy and cheap layer 2 BTC transactions could also work with legacy addresses. Here's how it works: Bitcoin legacy and native segwit addresses along with Stacks addresses all encode the so-called "hash160" of the user's public key. This means we can convert these two types of bitcoin addresses into a Stacks address and any Stacks address into either a legacy or native segwit bitcoin address. Using bitcoin addresses instead of Stacks addresses allows us to reuse many of the payment standards and QR code formats that have already been developed for bitcoin. It makes sBTC a true layer 2 bitcoin.

Larry Salibra | larry.btc

34,731 просмотров • 1 год назад

we just added support for bip-360 (p2mr) address, still in draft but soon. possibly the first wallet in the world to ship a quantum-ready address. bc1z is a segwit v2 output defined in bip-360. p2mr stands for pay to merkle root. unlike taproot, it commits only to a script-tree merkle root and completely removes the key-path spend. there is no internal public key embedded or committed in the output itself. in taproot, an internal public key is always part of the output, even if it is never used. with p2mr, the output contains only the merkle root of the script tree. a public key is revealed only at spend time, inside the executed script branch, not at receive time. this design avoids publishing long-lived public keys on chain in advance, reduces long-term public key exposure, and shrinks the attack surface in a potential quantum future where exposed public keys could become vulnerable. it is a structural hardening step at the address level. it does not change consensus rules, does not break existing wallets, and existing addresses continue to work as usual. job’s not done 🫡
0:20

we just added support for bip-360 (p2mr) address, still in draft but soon. possibly the first wallet in the world to ship a quantum-ready address. bc1z is a segwit v2 output defined in bip-360. p2mr stands for pay to merkle root. unlike taproot, it commits only to a script-tree merkle root and completely removes the key-path spend. there is no internal public key embedded or committed in the output itself. in taproot, an internal public key is always part of the output, even if it is never used. with p2mr, the output contains only the merkle root of the script tree. a public key is revealed only at spend time, inside the executed script branch, not at receive time. this design avoids publishing long-lived public keys on chain in advance, reduces long-term public key exposure, and shrinks the attack surface in a potential quantum future where exposed public keys could become vulnerable. it is a structural hardening step at the address level. it does not change consensus rules, does not break existing wallets, and existing addresses continue to work as usual. job’s not done 🫡

Yishi

37,709 просмотров • 8 месяцев назад

Why settle for one way to sign when you can have the airgapped signing trifecta? The COLDCARD Q has it all: 📸 QR 📲 NFC 💾 MicroSD Repost + reply with which signing method you prefer. One reply will win a Q.
0:27

Why settle for one way to sign when you can have the airgapped signing trifecta? The COLDCARD Q has it all: 📸 QR 📲 NFC 💾 MicroSD Repost + reply with which signing method you prefer. One reply will win a Q.

COLDCARD

10,835 просмотров • 1 год назад

So we tried a thing... A multi-key, multi-app, multi-device, multi-OS, multi-entropy-source 2-of-3 Collaborative Wallet with Bitcoin Keeper as the coordinator and BlueWallet plus Sparrow Wallet 🐦 as co-signers. Boom💥... worked like magic. You don't need to trust any one party/ platform/ team/ device/ OS here. Also, cost = $0.00. > Keeper on iOS > BlueWallet on Android > Sparrow on Mac/ desktop You can see the same first address generated by all three which confirms that they are the same wallet. Now you can use Sparrow to create a PSBT/ transaction and get it signed by the two mobile based apps. Note: Keeper also supports Airdrop, NFC, and QR for wallet creation and txn signing - which can be used based on it's counterparties capabilities.
3:04

So we tried a thing... A multi-key, multi-app, multi-device, multi-OS, multi-entropy-source 2-of-3 Collaborative Wallet with Bitcoin Keeper as the coordinator and BlueWallet plus Sparrow Wallet 🐦 as co-signers. Boom💥... worked like magic. You don't need to trust any one party/ platform/ team/ device/ OS here. Also, cost = $0.00. > Keeper on iOS > BlueWallet on Android > Sparrow on Mac/ desktop You can see the same first address generated by all three which confirms that they are the same wallet. Now you can use Sparrow to create a PSBT/ transaction and get it signed by the two mobile based apps. Note: Keeper also supports Airdrop, NFC, and QR for wallet creation and txn signing - which can be used based on it's counterparties capabilities.

Bitcoin Keeper

35,562 просмотров • 2 лет назад

Alex Thorn on self-custody: the Coldcard exploit makes the case for multisig, with not one satoshi stolen from a multisig wallet "This is a tough time to be relying on a company for your self custody. I think one of the big lessons has been the primacy and efficacy of multisig if you're self custodying." "Not one Satoshi was stolen in the Coldcard exploit from a multisig wallet. We can see that onchain when you spend coins. You reveal the entire script of the transaction that was holding them." "I think probably, in my opinion, the best option if you're doing self custody is to use multisig. Multiple hardware wallets. You can use collaborative custody like Casa and Unchained and AnchorWatch." "You're getting redundancy by having multiple signing devices rather than by storing a copy of the seed of the device." "You screenshot your 12 word seed or 24 word seed. It's one of the first things that hackers look for if they break into an email account or a computer." "We know all the possible words. They come from a dictionary of 4-BIP39. So it's very easy for them to just search for combinations of those words on your machine and instantly sweep your seed."
1:56

Alex Thorn on self-custody: the Coldcard exploit makes the case for multisig, with not one satoshi stolen from a multisig wallet "This is a tough time to be relying on a company for your self custody. I think one of the big lessons has been the primacy and efficacy of multisig if you're self custodying." "Not one Satoshi was stolen in the Coldcard exploit from a multisig wallet. We can see that onchain when you spend coins. You reveal the entire script of the transaction that was holding them." "I think probably, in my opinion, the best option if you're doing self custody is to use multisig. Multiple hardware wallets. You can use collaborative custody like Casa and Unchained and AnchorWatch." "You're getting redundancy by having multiple signing devices rather than by storing a copy of the seed of the device." "You screenshot your 12 word seed or 24 word seed. It's one of the first things that hackers look for if they break into an email account or a computer." "We know all the possible words. They come from a dictionary of 4-BIP39. So it's very easy for them to just search for combinations of those words on your machine and instantly sweep your seed."

The Wolf Of All Streets

18,983 просмотров • 15 дней назад

PSBT signing has never been this easy. Create the transaction with Sparrow Wallet 🐦. Sign on COLDCARD. No USB. No internet. Just a MicroSD. We’re giving away a COLDCARD Q to a Bitcoiner who replies with the moment they knew it was time to go airgapped.
0:40

PSBT signing has never been this easy. Create the transaction with Sparrow Wallet 🐦. Sign on COLDCARD. No USB. No internet. Just a MicroSD. We’re giving away a COLDCARD Q to a Bitcoiner who replies with the moment they knew it was time to go airgapped.

COLDCARD

24,513 просмотров • 1 год назад

Let's be honest: sending crypto is tricky. The interfaces can be confusing, and there's always some anxiety about entering the correct address and amount and making sure everything is accurate. Plus, there's the hassle of managing transaction fees. Someone had to put a stop to that, and we did. With this Tangem app update, you can: — Use a simple and smooth interface to send funds. — Select addresses from recent transactions or your own wallets — see all your addresses even if you have multiple wallets. — Enter amounts in the sending currency or fiat for your convenience. — Manually adjust transaction fees for greater flexibility. — Benefit from a clear confirmation screen to avoid mistakes. Enjoy the new and improved Tangem app now, available on the App Store and Google Play. 🖤
0:26

Let's be honest: sending crypto is tricky. The interfaces can be confusing, and there's always some anxiety about entering the correct address and amount and making sure everything is accurate. Plus, there's the hassle of managing transaction fees. Someone had to put a stop to that, and we did. With this Tangem app update, you can: — Use a simple and smooth interface to send funds. — Select addresses from recent transactions or your own wallets — see all your addresses even if you have multiple wallets. — Enter amounts in the sending currency or fiat for your convenience. — Manually adjust transaction fees for greater flexibility. — Benefit from a clear confirmation screen to avoid mistakes. Enjoy the new and improved Tangem app now, available on the App Store and Google Play. 🖤

Tangem

30,187 просмотров • 2 лет назад

A Monero transaction key is a unique cryptographic key created for each transaction. It lets you prove a payment was sent to a specific Monero address without breaking Monero’s privacy. If you don’t save your transaction key, you can’t recover it later. Edge makes it super easy to always find your transaction keys! Your transaction keys are encrypted and automatically backed up in Edge. This allow you to always access them when you need proof of payment. #XMR #Privacy
1:37

A Monero transaction key is a unique cryptographic key created for each transaction. It lets you prove a payment was sent to a specific Monero address without breaking Monero’s privacy. If you don’t save your transaction key, you can’t recover it later. Edge makes it super easy to always find your transaction keys! Your transaction keys are encrypted and automatically backed up in Edge. This allow you to always access them when you need proof of payment. #XMR #Privacy

Bri Teresi

34,722 просмотров • 10 месяцев назад

Want to send #Bitcoin without risking your keys? That’s what PSBTs are for. COLDCARD Q signs them 3 ways, all air-gapped: – MicroSD – QR – NFC Repost + reply with your favorite signing method 👇 One reply will win a COLDCARD Q.
0:35

Want to send #Bitcoin without risking your keys? That’s what PSBTs are for. COLDCARD Q signs them 3 ways, all air-gapped: – MicroSD – QR – NFC Repost + reply with your favorite signing method 👇 One reply will win a COLDCARD Q.

COLDCARD

16,316 просмотров • 1 год назад

for better understanding of how bitcoin works, i decided to build a fork called TETSUO. bitcoin uses secp256k1 ECDSA with SHA256/RIPEMD160 hashing for addresses and transaction signing. TETSUO maintains that exact same cryptographic foundation, we inherit decades of security research. but we optimized the transaction format: - sequence numbers set to 0xffffffff for full script compatibility - SIGHASH_ALL appended to the signing preimage before hashing (not after) - proper little-endian encoding throughout this meant rebuilding the entire signing pipeline. started by forking the bitcoin-core codebase, then built a complete TypeScript wallet SDK on top. implemented BIP39 mnemonic generation, UTXO selection, fee estimation, all the stuff wallets need. the critical part: client-side signing only. your private keys never touch any server. transaction is built locally, signed locally, broadcast to network. open source: (the node) (the SDK) (block explorer) understanding bitcoin meant understanding every layer of the protocol.
1:47

for better understanding of how bitcoin works, i decided to build a fork called TETSUO. bitcoin uses secp256k1 ECDSA with SHA256/RIPEMD160 hashing for addresses and transaction signing. TETSUO maintains that exact same cryptographic foundation, we inherit decades of security research. but we optimized the transaction format: - sequence numbers set to 0xffffffff for full script compatibility - SIGHASH_ALL appended to the signing preimage before hashing (not after) - proper little-endian encoding throughout this meant rebuilding the entire signing pipeline. started by forking the bitcoin-core codebase, then built a complete TypeScript wallet SDK on top. implemented BIP39 mnemonic generation, UTXO selection, fee estimation, all the stuff wallets need. the critical part: client-side signing only. your private keys never touch any server. transaction is built locally, signed locally, broadcast to network. open source: (the node) (the SDK) (block explorer) understanding bitcoin meant understanding every layer of the protocol.

acidburn

80,905 просмотров • 10 месяцев назад

In the video, we show how the attacker gained access to our wallet seed and simultaneously used his Sparrow Wallet to transfer the funds to a Bitcoin address under his control. At the same time, Wesatoshis, which monitors our wallet in real time, detected the unauthorized transaction and immediately executed a pre-signed panic transaction. By leveraging Replace-By-Fee (RBF), it replaced the attacker’s transaction and redirected the funds back to a Bitcoin address under our control.
0:39

In the video, we show how the attacker gained access to our wallet seed and simultaneously used his Sparrow Wallet to transfer the funds to a Bitcoin address under his control. At the same time, Wesatoshis, which monitors our wallet in real time, detected the unauthorized transaction and immediately executed a pre-signed panic transaction. By leveraging Replace-By-Fee (RBF), it replaced the attacker’s transaction and redirected the funds back to a Bitcoin address under our control.

wesatoshis

91,713 просмотров • 8 месяцев назад

Better late than never! Samsung now supports NFC Access Cards in Samsung Wallet. So, your office and apartment NFC access cards can now be stored and used on your Galaxy phone. You can also use the card information stored on your phone as a base for other supported Samsung phones to copy and scan. Unlike payment cards, there’s no authentication required before using the card. Hence, it’s both a convenience and a security risk. To access this feature under Digital Key, you will need to be running One UI 7 at least and updated to Samsung Wallet version 6.0.85 #Samsung #SamsungWallet #NFCCard
1:35

Better late than never! Samsung now supports NFC Access Cards in Samsung Wallet. So, your office and apartment NFC access cards can now be stored and used on your Galaxy phone. You can also use the card information stored on your phone as a base for other supported Samsung phones to copy and scan. Unlike payment cards, there’s no authentication required before using the card. Hence, it’s both a convenience and a security risk. To access this feature under Digital Key, you will need to be running One UI 7 at least and updated to Samsung Wallet version 6.0.85 #Samsung #SamsungWallet #NFCCard

SoyaCincau

14,344 просмотров • 1 год назад

Join us at our booth at BTC Prague where we show off the SeedHammer II and how easy it is to engrave a seed through a NFC device such as a COLDCARD Q or Mk4. All orders will receive a 5% discount in the Coinkite store.
0:32

Join us at our booth at BTC Prague where we show off the SeedHammer II and how easy it is to engrave a seed through a NFC device such as a COLDCARD Q or Mk4. All orders will receive a 5% discount in the Coinkite store.

SeedHammer

18,891 просмотров • 1 год назад

Introducing Combos to Polymarket ⏫ Combine any &amp; all events for even better returns. Stack your trades and win, only on Kreo. ⚡
0:32

Introducing Combos to Polymarket ⏫ Combine any &amp; all events for even better returns. Stack your trades and win, only on Kreo. ⚡

Kreo

28,071 просмотров • 4 месяцев назад