Re: [bitcoin-dev] How accurate are the Bitcoin timestamps?

2018-01-30 Thread Neiman via bitcoin-dev
On Mon, Jan 29, 2018 at 10:54 PM, Gregory Maxwell via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > On Mon, Jan 29, 2018 at 9:40 PM, Tier Nolan via bitcoin-dev > wrote: > > if there were tighter time requirements in the protocol > miners

Re: [bitcoin-dev] How accurate are the Bitcoin timestamps?

2018-01-30 Thread Neiman via bitcoin-dev
On Mon, Jan 29, 2018 at 10:40 PM, Tier Nolan via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > > Much of Bitcoin operates on the assumption that a majority of miners are > honest. If 50%+ of miners set their timestamp reasonably accurately (say > within 10 mins), then the actual

Re: [bitcoin-dev] How accurate are the Bitcoin timestamps?

2018-01-29 Thread George Balch via bitcoin-dev
The terms "simple ordering of blocks" and timestamp are essentially the same thing. On Jan 29, 2018 1:16 PM, "Neiman via bitcoin-dev" < bitcoin-dev@lists.linuxfoundation.org> wrote: > First time posting here, please be gentle. > > I'm doing a research project about blockchain timestamping. There

Re: [bitcoin-dev] How accurate are the Bitcoin timestamps?

2018-01-29 Thread Bryan Bishop via bitcoin-dev
On Mon, Jan 29, 2018 at 7:34 AM, Neiman via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > > But how accurate are Bitcoins timestamps? > A perspective on block timestamp and opentimestamps can be found here: https://lists.w3.org/Archives/Public/public-blockchain/2016Sep/0076.html

Re: [bitcoin-dev] How accurate are the Bitcoin timestamps?

2018-01-29 Thread Gregory Maxwell via bitcoin-dev
On Mon, Jan 29, 2018 at 9:40 PM, Tier Nolan via bitcoin-dev wrote: > For check locktime, the median of the last 11 blocks is used as an improved > indicator of what the actual real time is. Again, it assumes that a > majority of the miners are honest. It

Re: [bitcoin-dev] How accurate are the Bitcoin timestamps?

2018-01-29 Thread Tier Nolan via bitcoin-dev
On Mon, Jan 29, 2018 at 1:34 PM, Neiman via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > > *2.* Timestamps are not necessary to avoid double-spending. A simple > ordering of blocks is sufficient, so exchanging timestamps with enumeration > would work double-spending wise.

[bitcoin-dev] How accurate are the Bitcoin timestamps?

2018-01-29 Thread Neiman via bitcoin-dev
First time posting here, please be gentle. I'm doing a research project about blockchain timestamping. There are many such projects, including the fantastic OpenTimestamps. All of the projects essentially save some data in a block, and rely on the block timestamp as a proof that this data