A Secure Offline Bitcoin Payment System

A paper titled Secure Wallet-Assisted Offline Bitcoin Payments with Double-Spender Revocation (https://www.ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/system-security-group-dam/research/publications/pub2017/asia084.pdf) was published a while ago. The paper proposes the first solution for secure Bitcoin offline payments using an offline wallet with several novel security mechanisms to prevent double-spending and to verify the coin validity in offline setting. There are three phases: Online Bitcoin […]

No transactions are showing on my Blockchain page

I’m new to this but I know how to use the request button on BlockChain to receive money? The Bitcoin was sent to the address I provided and I didn’t get it. I’ve received money before and sent money and none of this is showing. Transactions aren’t even showing on my blockchain home page. I’ve […]

How are fees determined in the Lightning Network?

I’d simply like to expand on Andrew’s answer and mention that the routing algorithm used to find the various hops towards your final destination payment will also impact your resulting fee. The idea is that channels sometimes become almost exhausted – where most of the money is pushed towards one direction. This is bad for […]

Vitalik Buterin Demands Court Challenge Against New nChain Patent

Ethereum co-founder Vitalik Buterin has openly criticized Blockchain research company nChain’s latest patent award, calling for opponents to challenge it in court.Pure Invention?nChain, whose chief scientist Craig Wright claims to be Bitcoin creator Satoshi Nakamoto while heavily endorsing altcoin Bitcoin Cash, received its latest European patent for what it describes as a “digital security invention.”“This […]

doublespend – Security via Proof – of – Work

I am reading Satoshi’s original paper, merely for the sake of understanding the concept. I have minimal computer science background (some), mostly just mathematics. In Section 4. Proof of Work of Satoshi’s original paper, he (she? who knows) says ‘Once the CPU effort has been expended to make it satisfy the proof-of-work, the block cannot […]

High-Resolution Snapshot of Zika Virus Reveals Clues to Fighting It

The microscopic distinctions may explain why dengue sometimes develops into a hemorrhagic fever, while Zika manifests as birth defects, for example, said Michael G. Rossmann, a microbiologist at Purdue University and one of the study’s authors. “At a lower resolution, many of these viruses just look like matching spherical balls,” said Madhumati Sevvana, the study’s […]