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About 10,000 papers for “Timestamp”

Testing timestamp

Pharmaceutical journal/˜The œpharmaceutical journal · 2024

Cited by 0

DR timestamp

Panagis, Christoforos · Zenodo (CERN European Organization for Nuclear Research) · 2025

This is a personal timestamp record.

Cited by 0Open access

GP timestamp

Christoforos Panagis · Zenodo (CERN European Organization for Nuclear Research) · 2025

This record serves solely as a time-stamped registration of a private research document. The purpose of this entry is to establish provenance and authorship at a specific point in time, independent of public dissemination or peer review. Access to the underlying material is withheld by design.

Cited by 0Open access

DR timestamp

Panagis, Christoforos · Zenodo (CERN European Organization for Nuclear Research) · 2025

This is a personal timestamp record.

Cited by 0Open access

Timestamp snooping

Milo M. K. Martin, Daniel J. Sorin, Anatassia Ailamaki et al. · 2000

Cited by 42

GP timestamp

Christoforos Panagis · Zenodo (CERN European Organization for Nuclear Research) · 2025

This record serves solely as a time-stamped registration of a private research document. The purpose of this entry is to establish provenance and authorship at a specific point in time, independent of public dissemination or peer review. Access to the underlying material is withheld by design.

Cited by 0Open access

Photos with Timestamp

Mlejnek, Matěj · Brno University of Technology Digital Library (Brno University of Technology) · 2019

Tato práce řeší způsob návrhu a implementace systému pro vytváření časových razítek k fotografiím po skupinách. Zabývá se možnostmi zpětného ověřování autentičnosti těchto vytvořených skupinových (hromadných) časových razítek. Celý systém je možné rozdělit na čtyři části. Část s mobilním zařízením, ve kterém jsou vytvářeny uživatelem fotografie. Druhá čast je server, na kterém jsou jednotlivé fotografie zálohovány a přeposílány k časovému orazítkování. Třetí část se skláda ze serveru zařizujícího vytváření hromadných časových razítek. Čtvrtá je složena z implementace uživelských nástroju pro zpětné ověření, zda byla fotografie úspěšně časově orazítkována.

Cited by 0

Timestamp Manipulation: Timestamp-based Nakamoto-style Blockchains are Vulnerable

Junjie Hu, Sisi Duan · ArXiv.org · 2025

Nakamoto consensus are the most widely adopted decentralized consensus mechanism in cryptocurrency systems. Since it was proposed in 2008, many studies have focused on analyzing its security. Most of them focus on maximizing the profit of the adversary. Examples include the selfish mining attack [FC '14] and the recent riskless uncle maker (RUM) attack [CCS '23]. In this work, we introduce the Staircase-Unrestricted Uncle Maker (SUUM), the first block withholding attack targeting the timestamp-based Nakamoto-style blockchain. Through block withholding, timestamp manipulation, and difficulty risk control, SUUM adversaries are capable of launching persistent attacks with zero cost and minimal difficulty risk characteristics, indefinitely exploiting rewards from honest participants. This creates a self-reinforcing cycle that threatens the security of blockchains. We conduct a comprehensive and systematic evaluation of SUUM, including the attack conditions, its impact on blockchains, and the difficulty risks. Finally, we further discuss four feasible mitigation measures against SUUM.

Cited by 0Open access

Timestamp Data Type

National Cancer Institute · Definitions · 2020

A variation of the Date datatype that's useful for storing very precise datetime values, down to small fractions of seconds. The Timestamp datatype stores all the information that the Date datatype stores, but also includes fractional seconds.

Cited by 0Open access

ATGC Timestamp Test

Sung Hun Yu · Zenodo (CERN European Organization for Nuclear Research) · 2026

Cited by 0Open access

Timestamp boson sampling

Wenhao Zhou, Jun Gao, Zhi‐Qiang Jiao et al. · Applied Physics Reviews · 2022

Quantum advantage, benchmarking the computational power of quantum machines outperforming all classical computers in a specific task, represents a crucial milestone in developing quantum computers and has been driving different physical implementations since the concept was proposed. A boson sampling machine, an analog quantum computer that only requires multiphoton interference and single-photon detection, is considered to be a promising candidate to reach this goal. However, the probabilistic nature of photon sources and the inevitable loss in evolution network make the execution time exponentially increasing with the problem size. Here, we propose and experimentally demonstrate a timestamp boson sampling scheme that can effectively reduce the execution time for any problem size. By developing a time-of-flight storage technique with a precision up to picosecond level, we are able to detect and record the complete time information of 30 individual modes out of a large-scale 3D photonic chip. We perform the three-photon injection and one external trigger experiment to demonstrate that the timestamp protocol works properly and effectively reduce the execution time. We further verify that timestamp boson sampler is distinguished from other samplers in the case of limited datasets through the three heralded single photons injection experiment. The timestamp protocol can speed up the sampling process, which can be widely applied in multiphoton experiments at low-sampling rate. The approach associated with newly exploited resource from time information can boost all the count-rate-limited experiments, suggesting an emerging field of timestamp quantum optics.

Cited by 9Open access

Timestamp Boson Sampling

Wenhao Zhou, Jun Gao, Zhi‐Qiang Jiao et al. · Figshare · 2020

Quantum advantage, benchmarking the computational power of quantum machines outperforming all classical computers in a specific task, represents a crucial milestone in developing quantum computers and has been driving different physical implementations since the concept was proposed. Boson sampling machine, an analog quantum computer that only requires multiphoton interference and single-photon detection, is considered to be a promising candidate to reach this goal. However, the probabilistic nature of photon sources and inevitable loss in evolution network make the execution time exponentially increasing with the problem size. Here, we propose and experimentally demonstrate a timestamp boson sampling that can reduce the execution time by 2 orders of magnitude for any problem size. We theoretically show that the registration time of sampling events can be retrieved to reconstruct the probability distribution at an extremely low-flux rate. By developing a time-of-flight storage technique with a precision up to picosecond level, we are able to detect and record the complete time information of 30 individual modes out of a large-scale 3D photonic chip. We successfully validate boson sampling with only one registered event. We show that it is promptly applicable to fill the remained gap of realizing quantum advantage by timestamp boson sampling. The approach associated with newly exploited resource from time information can boost all the count-rate-limited experiments, suggesting an emerging field of timestamp quantum optics.

Cited by 2Open access

Common Calendar Timestamp System

Brooks Harris · Proceedings of the ... annual Precise Time and Time Interval (PTTI) Systems and Applications Meeting/Proceedings of a meeting - Precise Time and Time Interval (PTTI) Systems and Applications Meeting · 2023

Civil timekeeping demands timestamps with sufficient information to represent accurate local time. We present a system called Common Calendar Timestamp System (CCT) that produces binary and character timestamp formats providing technically accurate and human readable local time incorporating Coordinated Universal Time (UTC) leap?seconds, time zones and geographic coordinates. CCT is organized into layered specifications to provide clear guidance on the interpretation of International Earth Rotation Reference Systems Service (IERS) leap?seconds, Internet Assigned Numbers Authority (IANA) Time Zone Database (Tz Database) information and GIS coordinates, algorithms for UTC calculation, binary and character timestamp formats, methods for populating and reading the two formats, and a high?level Application Programming Interface (API) for convenient manipulation of calendaring operations. The binary format is a compound counter composed of [day?number][leap?seconds][time?of?day] with additional local time metadata to enable efficient machine interchange. The character format is a human readable form with additional metadata reflecting the information in the binary format. For example: D2023?01?26T12:00:00U?08Zamerica/los_angelesApstV2021aL27SwcMuX CCT is designed to satisfy people's expectations by representing the local time as known to the emitting system. The formats are designed to facilitate calculation of time marks within the current day without need for access to external metadata. Normalization to UTC is an inherent quality. Geographic coordinate data may be included to provide traceability provenance for 4D GIS applications. Central to the CCT implementation is incorporation of the open source Tz Database data and code. The local time rules in the many time zones all over the world are quite complex. Tz Database has undergone years of development to accommodate these intricate variations and is used directly or indirectly in most operating systems and timekeeping implementations. CCT now employs its functionality for interoperation with existing systems such as Linux, Apple and Android. CCT supports use of Unicode Common Locale Data Repository (CLDR) to map Tz Database time zones to Microsoft Windows time zones. CCT treatment of UTC is implemented with counting methods to accommodate the common practice of leap?second introduction in local time simultaneous with UTC or "rolling leap?seconds" as used by some systems. It also can accommodate the variations used by NTP and Posix time. Negative leap?seconds are supported. Common Calendar Timestamp provides a robust timestamp system for general purposes and may be implemented with sufficient accuracy to satisfy financial regulations and be suitable for use as legal time and traceability provenance. The author hopes the proposal may find support for standardization and looks forward to the community's suggestions for refinement. Common Calendar has undergone significant refinement since its introduction at PTTI 2019 and addition of geographic coordinates for Geostamp in 2021. Improvements include development of CCTMetaGen, an application to produce consolidated leap?second, time zone, and Windows time zone metadata for CCT Client writers and readers.

Cited by 0