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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

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210,951 Aufrufe • vor 1 Jahr •via X (Twitter)

FinanzenWissenschaft & Technologie#COLDCARD
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Profilbild von COLDCARD
COLDCARDvor 1 Jahr

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

Profilbild von I)ruid
I)ruidvor 1 Jahr

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

Profilbild von Hodlingbtc
Hodlingbtcvor 1 Jahr

@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

Profilbild von COLDCARD
COLDCARDvor 1 Jahr

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

Profilbild von Meat Mech Architect
Meat Mech Architectvor 1 Jahr

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

Profilbild von BTCMAT
BTCMATvor 1 Jahr

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

Profilbild von COLDCARD
COLDCARDvor 1 Jahr

@SparrowWallet @mempool @nunchuk_io @Coinkite ANY wallet.

Profilbild von SF Hodl
SF Hodlvor 1 Jahr

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

Profilbild von Mountain_HODL
Mountain_HODLvor 1 Jahr

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

Profilbild von Stefan K - e/acc
Stefan K - e/accvor 1 Jahr

@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.

Ähnliche Videos

#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

111,252 Aufrufe • vor 8 Monaten

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

13,676 Aufrufe • vor 1 Monat

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

34,101 Aufrufe • vor 1 Jahr

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

10,801 Aufrufe • vor 10 Monaten

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

37,490 Aufrufe • vor 4 Monaten

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

24,330 Aufrufe • vor 10 Monaten

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 Aufrufe • vor 2 Jahren

One of the most valid criticisms of Abstract Global Wallet was crypto native users not being able to view the raw calldata of transactions before signing. To address this, we recently added: - Ability to view full tx details. - Transaction simulation to show impact of balances.
0:23

One of the most valid criticisms of Abstract Global Wallet was crypto native users not being able to view the raw calldata of transactions before signing. To address this, we recently added: - Ability to view full tx details. - Transaction simulation to show impact of balances.

Jarrod Watts

20,508 Aufrufe • vor 1 Jahr

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 Aufrufe • vor 5 Monaten

Clear Signing and Transaction Checks are available for Aave! It’s simple, connect wallet to Aave using WC, then follow the steps in Ledger Live. On your device, you can verify exactly what you’re signing and even view the results of transaction simulations. Earn yield on your assets while keeping full self-custody and end-to-end security. If your favorite dApp is not yet clear-signed, simply ask them to add the support here. It's really easy for them.
1:01

Clear Signing and Transaction Checks are available for Aave! It’s simple, connect wallet to Aave using WC, then follow the steps in Ledger Live. On your device, you can verify exactly what you’re signing and even view the results of transaction simulations. Earn yield on your assets while keeping full self-custody and end-to-end security. If your favorite dApp is not yet clear-signed, simply ask them to add the support here. It's really easy for them.

Charles Guillemet

40,105 Aufrufe • vor 8 Monaten

WHAT A WAY TO START THE DAY💥 Thanks HS🇱🇧🫶 🕊🦅 Cucan for sending my stocks to 🌝 Today😍 #BM8O 53%⏫ #BM8 43%⏫ #LU7 38%⏫ #LU7OB 29%⏫ $DAL 27%⏫ $AVMO 22%⏫ $AVM 19%⏫ $BMMO 13%⏫ $PLN 13%⏫ $VMM 7%⏫ $ALR 7%⏫ $BMM 7%⏫ Amazing Day at #ASX Casino &amp; in Mauritius💥♥️
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WHAT A WAY TO START THE DAY💥 Thanks HS🇱🇧🫶 🕊🦅 Cucan for sending my stocks to 🌝 Today😍 #BM8O 53%⏫ #BM8 43%⏫ #LU7 38%⏫ #LU7OB 29%⏫ $DAL 27%⏫ $AVMO 22%⏫ $AVM 19%⏫ $BMMO 13%⏫ $PLN 13%⏫ $VMM 7%⏫ $ALR 7%⏫ $BMM 7%⏫ Amazing Day at #ASX Casino &amp; in Mauritius💥♥️

YellowStripes💥

17,629 Aufrufe • vor 8 Monaten

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 Aufrufe • vor 9 Monaten

⏫DUBATHON 2025⏫ Thanks to Rob for helping me put it together, the boys for supporting me all the time and most importantly thanks to MrsDUBBY for not only holding down the stream, but allowing it to take over our lives for a month! #NEEDIT #NSFW
4:25

Sensitive content

⏫DUBATHON 2025⏫ Thanks to Rob for helping me put it together, the boys for supporting me all the time and most importantly thanks to MrsDUBBY for not only holding down the stream, but allowing it to take over our lives for a month! #NEEDIT #NSFW

DUBBY

35,308 Aufrufe • vor 1 Jahr

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

90,009 Aufrufe • vor 3 Monaten

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

18,760 Aufrufe • vor 1 Jahr

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

10,448 Aufrufe • vor 11 Monaten

If your wallet address gets poisoned 🐍 Better know the ingredients for the antidote! 🧪 🌿 Always double-check the addresses you're sending funds to 🌿 Never copy addresses from transaction histories 🌿 Use a wallet that supports whitelisting or bookmarks
0:38

If your wallet address gets poisoned 🐍 Better know the ingredients for the antidote! 🧪 🌿 Always double-check the addresses you're sending funds to 🌿 Never copy addresses from transaction histories 🌿 Use a wallet that supports whitelisting or bookmarks

Revoke.cash

204,371 Aufrufe • vor 1 Jahr

Hello Raccooners! 🦝🔜 To make collecting EVM addresses for testnetooors more convenient, here’s how you can submit yours, please follow the guide video attached: 1️⃣ Send any amount of any token to one of these addresses: init1l294mntap6m46gfgxpj7k2ffpzq7ea290wf58k sendyourevm.init 2️⃣ IMPORTANT: Add your MM/Rabby EVM address in the transaction memo. 📄 Eligible users: 💡 This is only for eligible testnetoooors listed in the spreadsheet. If you’re not on the list, please do not send anything. 🕒 Deadline: January 13th, 23:59 (GMT 0) Special thanks to Harvey, Scott, and Zaar 💊 – true chads for their help and support ❤️
0:47

Hello Raccooners! 🦝🔜 To make collecting EVM addresses for testnetooors more convenient, here’s how you can submit yours, please follow the guide video attached: 1️⃣ Send any amount of any token to one of these addresses: init1l294mntap6m46gfgxpj7k2ffpzq7ea290wf58k sendyourevm.init 2️⃣ IMPORTANT: Add your MM/Rabby EVM address in the transaction memo. 📄 Eligible users: 💡 This is only for eligible testnetoooors listed in the spreadsheet. If you’re not on the list, please do not send anything. 🕒 Deadline: January 13th, 23:59 (GMT 0) Special thanks to Harvey, Scott, and Zaar 💊 – true chads for their help and support ❤️

Raccoons

81,889 Aufrufe • vor 1 Jahr

NEXI Payment Received 🤑🫡 You can now check your $NEXI tokens on Etherscan. 🔎 Check here: Search your NEXI wallet address to see the transaction. ⚠️ Note: Tokens are not showing in the Nexira Trading Wallet yet, so withdrawal is not possible right now. ⏳ Please wait for the next official update. 📢 Join for updates:
0:23

NEXI Payment Received 🤑🫡 You can now check your $NEXI tokens on Etherscan. 🔎 Check here: Search your NEXI wallet address to see the transaction. ⚠️ Note: Tokens are not showing in the Nexira Trading Wallet yet, so withdrawal is not possible right now. ⏳ Please wait for the next official update. 📢 Join for updates:

Vishal Raj ✨

69,566 Aufrufe • vor 3 Monaten

🏃 As promised - we are allowing all Movers to claim their first 20% of $AMO earnings today on the Amino Move app. New versions for iOS and Android with the airdrop functionality have been uploaded to the app stores and are awaiting approval. Here is what you need to know! 1. Check the app stores for when the new version is available and update. 2. Hit the new “airdrop” button on the home page. 3. Enter the amount of $AMO you want to submit for withdrawal. (max 20% of your balance) 4. Enter your non-custodial BEP20 wallet address (Metamask or Trust Wallet recommended) 5. Wait for the BNB launch to happen and your tokens to show up in the wallet you provided. ⚠️ Please note, inputting an exchange wallet address instead of a non-custodial wallet address will likely result in the loss of your $AMO. An 100 $AMO fee is applied to cover gas fees. Not all ineligibly earned tokens have been removed yet. Remaining 80% of tokens and future earned tokens will be available for withdrawal after the BNB chain launch.
0:25

🏃 As promised - we are allowing all Movers to claim their first 20% of $AMO earnings today on the Amino Move app. New versions for iOS and Android with the airdrop functionality have been uploaded to the app stores and are awaiting approval. Here is what you need to know! 1. Check the app stores for when the new version is available and update. 2. Hit the new “airdrop” button on the home page. 3. Enter the amount of $AMO you want to submit for withdrawal. (max 20% of your balance) 4. Enter your non-custodial BEP20 wallet address (Metamask or Trust Wallet recommended) 5. Wait for the BNB launch to happen and your tokens to show up in the wallet you provided. ⚠️ Please note, inputting an exchange wallet address instead of a non-custodial wallet address will likely result in the loss of your $AMO. An 100 $AMO fee is applied to cover gas fees. Not all ineligibly earned tokens have been removed yet. Remaining 80% of tokens and future earned tokens will be available for withdrawal after the BNB chain launch.

Amino

269,271 Aufrufe • vor 2 Jahren