8 Can nLockTime TX be used to flood Mempools? 2013-03-15T08:19:59.533

8 If SHA256 were compromised tomorrow, would Bitcoin collapse, or is there some contingency plan to move the network to a new hashing algorithm? 2013-11-03T08:40:45.963

8 Creating a fake transaction 2014-01-31T10:48:15.813

8 How can an online wallet be more secure than paper wallets or cold storages? 2014-10-02T07:25:21.407

8 What is the "1 RETURN" bug? 2015-06-17T09:58:50.980

8 How can importprivkey compromise wallet security when importing a publicly known private key? 2015-09-11T05:02:11.663

8 Could cryptocurrency "insurance" slow Bitcoin adoption? 2016-06-20T17:21:33.873

8 Is it safe to store all my coins on Coinbase? 2017-05-04T02:02:28.270

7 How should centralized wallets handle user accounts? 2011-09-16T00:00:26.740

7 Who controls Solidcoin's special millionaire accounts? 2011-10-17T02:22:23.463

7 Do no-fee transaction represent a greater risk if the product is delivered instantly? 2011-11-03T11:24:46.647

7 How can one download the initial Blockchain data files securely? 2012-05-02T21:36:20.417

7 Has someone compared the cost of mining vs. that of brute-forcing addresses? 2012-05-15T09:41:51.460

7 What happens if my wallet gets "hacked" and my BTC is stolen? 2012-12-12T15:48:01.380

7 Is it safe to run bitcoind on another server 2013-01-25T23:54:50.107

7 What alternatives are there to hardcoding checkpoints into the Bitcoin client? 2013-02-21T10:11:16.340

7 What are the security considerations for hosting *your own* Electrum server? 2013-03-07T15:48:13.870

7 Possible to create a double spend attack by replacing a Tx in the merkle tree? 2013-03-19T17:02:28.747

7 Does it hurt the network to reuse addresses? 2014-02-19T09:34:43.430

7 Can the blockchain be outpaced by a chain of low-difficulty blocks? 2014-05-07T14:47:15.713

7 Does GHashIO already have above 51% hashrate? 2014-06-19T00:53:58.790

7 Is there a fallback plan if bitcoin's underlying cryptography is cracked? 2014-11-14T22:00:18.563

7 Proving a transaction is mine 2015-01-09T11:14:48.547

7 Receiving donation on a bitcoin address and security issues of reusing the same address 2015-03-04T13:23:14.570

7 How do I know that my bitcoins are real 2016-08-30T02:05:26.063

7 Miner modifies unconfirmed transactions and put it into the block 2018-03-13T15:21:04.750

7 Is a bitcoin address collision possible if generating 90 million addresses every 4 hours? 2019-01-19T20:12:31.507

6 Is the authentication system of the Bitcoin <-> SMS service PHONECO.IN adequate? 2011-09-01T11:36:02.573

6 What is meant by "releasing code tells the hackers what to attack"? 2011-09-05T08:10:19.533

6 Are there any attacks with a plurality of computing power? 2011-09-24T18:19:43.290

6 Two bitcoin addresses - Can you link them together? 2011-12-17T22:40:32.950

6 How can I copy the blockchain from my working client for use with a live CD savings wallet? 2011-12-20T23:12:06.890

6 Is there any software available for testing of Bitcoin security? 2012-02-27T13:09:19.930

6 How secure are the DNS servers for Bitcoin? 2012-05-01T17:14:47.067

6 Where can I learn more about BIP30; namely the exploit and the background discussion? 2012-12-22T18:35:03.500

6 Could miners steal money? 2013-02-06T02:51:07.237

6 How does Ripple solve the sock-puppet problem during consensus? 2013-02-14T10:27:13.087

6 How exactly is my account/wallet at ripple.com secure? 2013-04-15T01:53:20.760

6 How did the FBI "seize 260000 BTC"? 2013-10-22T07:57:44.130

6 How do we know that the algorithm of Bitcoin does not embed bugs since inception? 2013-12-09T15:15:18.073

6 Is there a way to stop a man-in-the-middle attack when communicating addresses? 2014-02-24T12:59:33.030

6 Supermajority to prevent 51% attack? 2014-06-16T15:33:30.187

6 Can you mine without transactions? 2014-09-08T18:14:31.147

6 How to generate a public key from a private key using Elliptic Curve Digital Signature Algorithm 2014-10-27T19:46:51.090

6 Which exchanges support U2F authentication? 2014-12-02T17:58:53.827

6 Why can't bitcoin miners modify transaction outputs? 2015-11-02T00:24:13.960

6 Bitcoin safe if ECDSA is broken? 2016-06-06T13:46:12.833

6 What is the most secure operating system that I can use to store bitcoins without having to fear a hacker stealing them? 2017-01-12T18:10:31.220

6 How to make totally secure Bitcoin transactions? 2017-11-08T19:54:12.073

6 If a single private key of the HD bitcoin account is compromised, is the whole HD account compromised? 2017-11-27T18:33:31.580

6 Why is increasing block size in the Bitcoin network considered to decrease security? 2018-12-06T10:11:10.077

6 Can a full node provide a bogus block bloomfilter to a Neutrino node? 2019-01-18T21:31:51.473

6 Why is the length of the transport messages on the lightning network encrypted? 2019-03-12T14:00:29.107

5 What incentive is there for a miner to not include a bad transaction? 2011-09-10T12:18:03.120

5 How to perform a double spend attack in websites that accept transactions with 0 confirmations? 2011-11-03T13:39:14.293

5 How does Alice know she is receiving the correct address? 2012-03-18T17:34:52.513

5 When MtGox was hacked on 15th June 2011, how many bitcoins were actually stolen? 2012-05-18T01:45:17.133

5 Is bitcoinica.com planning to reopen after the 11th May 2012 theft? 2012-05-18T03:41:06.580

5 Can a miner remain anonymous? 2012-07-24T18:32:15.890

5 Setting up BAMT root access 2012-08-20T20:28:58.207

5 How can one use multi signature transactions/addresses to improve the security of their services? 2012-09-18T12:32:50.553

5 Must mining be profitable for Bitcoin to succeed? If no, what are the mitigations? 2012-09-19T01:23:10.340

5 What is the reputation of bitfloor? 2012-10-09T14:11:56.030

5 If miners pay income tax, could a change in tax laws affect network security? 2012-11-22T18:45:45.853

5 What's the risk of publicizing a Bitcoin address? 2012-11-26T09:21:08.370

5 How to redeem a private key in case it is compromised 2012-12-07T10:58:14.157

5 Does a Vanity Address reduce the randomness / entropy of the private key? Is there cryptographic proof? 2013-01-06T16:29:48.593

5 How do Javascript-based wallets generate random numbers and is this cryptographically secure? 2013-01-09T12:58:45.473

5 Securing bitcoin addresses in database 2013-01-16T14:41:17.293

5 How would Bitcoin usage be affected within a country that severed its Internet connection? 2013-01-21T23:28:27.023

5 Can someone with an unlimited amount of money compromize the network? 2013-03-26T05:03:11.097

5 Wouldn't compromised crypto require entire block chain to be recomputed? 2013-04-12T13:55:48.857

5 What precautions should be taken to protect a Ripple wallet? 2013-04-17T21:29:37.813

5 How do I recover Bitcoins from a Change address that is in a corrupted wallet? 2013-06-02T21:13:11.160

5 How is it possible that webservers with deterministic wallets can produce public keys without knowing the underlying private key? 2013-10-17T09:17:16.877

5 Can ISP intercept network messages to identify the IP of the transaction issuer? 2014-02-18T09:38:41.013

5 Bitcoin value vs. Supercomputing 2014-05-09T15:56:04.267

5 How could a time warp attack be prevented? 2015-01-07T06:16:19.223

5 Why is a chain code needed for entropy in HD wallets? 2015-12-01T02:26:58.377

5 Can a clever hacker still steal everyone's money from the blockchain.info wallet? 2016-02-24T19:45:47.077

5 Capturing IP address of transactions submitted to Bitcoin 2016-04-02T01:27:08.573

5 Why can malicious miners not award themselves with any number of bitcoins? 2016-06-26T17:38:59.370

5 Can a blockchain from the future be synchronized today? 2016-10-07T22:01:42.150

5 Will Bitcoin scaling affect the amount of hashing power required to keep the network secure? 2016-10-21T16:15:23.177

5 Can we report a fraudster by their bitcoin wallet address? 2018-01-03T21:49:27.157

5 How can all possible numbers in 256-bit space be squeezed into 160-bit space? 2018-07-26T16:56:33.643

5 Does MuSig have the same security as 2-2 multisig? 2019-03-06T12:48:17.927

5 How can I protect my funds in the event a quantum computer breaks the ECDLP that Bitcoin relies on? 2019-10-17T04:52:05.623

4 How many consumer computers would it take to launch a 51% attack 2011-09-14T18:24:08.857

4 Would it be possible to create a mining pool service that specifically processed only certain transactions? 2012-01-06T11:10:52.333

4 Are there any transaction-related artifacts left in the database? 2012-02-11T21:49:19.380

4 How to secure one's Bitcoin Client from packet sniffing? 2012-04-07T13:48:27.757

4 How can multifactor authentication be used when there needs to be two people with access? 2012-07-18T06:55:24.800

4 What happened to my coins, hacked? 2012-12-12T12:50:25.643

4 Is JavaScript wallet generator available at bitaddress.org relatively secure? 2013-02-26T19:45:27.650

4 Use Stolen Private Key? 2013-03-02T17:59:57.977

4 What has a lower long term cost per hash: LTC, BTC or other alt coin? 2013-03-08T18:14:04.110

4 How should webapps handle addresses/wallets? 2013-04-14T13:56:02.380

4 How do I reconfigure a Mt. Gox Yubikey? 2013-06-22T03:31:14.153