Blockchain Papers

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92,314 papersLast indexed Aug 16, 2026
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92,314 results · page 65 of 3,847

Jun 16, 2026·Zenodo (CERN European Organization for Nuclear Research)
0 cites
Sovereign Personal Evidence

W Gordon

Sovereign Personal Evidence is a defensively disclosed local-first architecture for preserving externally issued, high-assurance signed assertions and their verification transactions as durable, user-controlled evidence artifacts. The architecture extends the deterministic provenance engine first disclosed in Sovereign v1.0 (DOI 10.5281/zenodo.19056811) to a new evidence class: externally issued personal assertions such as verifiable credentials, selective-disclosure presentations, zero-knowledge identity proof results, and passport- or NFC-derived verification artifacts. The disclosed system ingests an external assertion, validates it according to its native trust model, cryptographically binds it to the specific request context and a local holder anchor, records it as a typed event in an append-only hash-chained personal provenance ledger, and exports a portable proof bundle for later independent verification — without requiring continued access to the original verification platform. This document constitutes a public defensive disclosure establishing prior art for the disclosed combination of elements, including composite assertion-to-context binding, a two-mode verification-engine fork, timestamped status and revocation evidence preservation, minimal-disclosure evidence packaging, and a personal evidence threat model. Publication is intended to prevent future patent claims covering the same or substantially similar system design.

Open access
2 source records
Digital and Cyber Forensics
Scientific Computing and Data Management
Blockchain Technology Applications and Security
Original source
Jun 16, 2026·F1000Research
0 cites
Mapping the Global Landscape of Sustainable Venture Capital: A Bibliometric Analysis of Research Evolution and Collaboration Networks

Hasni Dyah Kurniawati, Saefudin Saefudin, fernando julio parera, Nurlyana Puspitasari · 7 authors

<ns3:p> Research background In recent decades, venture capital (VC) has increasingly incorporated sustainability principles, reflecting the global shift toward environmentally and socially responsible investment. The alignment of VC with sustainability goals responds to the climate crisis, technological transformation, and social expectations for ethical finance. However, research on the VC–sustainability nexus remains fragmented across disciplines, requiring systematic mapping to clarify key trends and research gaps. This study aims to map the global evolution of VC research within the context of sustainability. It identifies publication trends, collaboration patterns, main thematic clusters, and emerging research areas to provide an integrated understanding of this growing field. Methods A mixed-methods bibliometric analysis was conducted using data retrieved from the Scopus database for the period 2002–2025. Analytical tools including <ns3:italic>RStudio and VOSviewer</ns3:italic> were applied to examine publication dynamics, co-authorship networks, and conceptual structures. The SPAR-4-SLR protocol was adopted to ensure methodological transparency and rigor. Discussion Results show that international collaboration—particularly among China, the United States, and the United Kingdom—drives sustainable innovation in the VC ecosystem. Three main clusters were identified: the theoretical evolution of VC, long-term policy and economic frameworks, and VC’s role in green entrepreneurship and sustainable technology. Research on emerging themes such as decentralized finance (DeFi), machine learning, and risk modeling remains limited. This study adds value by offering a systematic overview of the intellectual landscape and highlighting future research directions to strengthen VC’s contribution to global sustainability. </ns3:p>

Open access
Private Equity and Venture Capital
Community Development and Social Impact
Entrepreneurship Studies and Influences
Original source
Jun 16, 2026·Zenodo (CERN European Organization for Nuclear Research)
0 cites
BRIDGING TRADFI AND DEFI: EVENT-DRIVEN INTEROPERABILITY PROTOCOLS FOR REAL-TIME FIAT-TO-CRYPTO SETTLEMENTS

Abhinav Reddy Jutur

The division between traditional finance (TradFi) and decentralized finance (DeFi) continues tohinder seamless capital mobility across ecosystems. Real‑Time Payment Systems (RTPS) achievenear‑instant fiat settlements, yet bridging these assets into blockchain environments remainsdependent on fragmented, high‑latency, and centralized gateways. This gap limits the naturalstrengths of both worlds, especially speed and efficiency. Based on the publish/subscribe model, theEDSP protocol operates as a decentralized oracle system that allows for synchronization of stateupdates between two separate ledgers. This protocol will allow smart contracts to initiate fiatpayments and bank payment systems to trigger corresponding blockchain settlement actions. Themodel stresses cryptographic protections against oracle tampering through multi-party authenticationand zero-trust routing methodologies. A simulation of latency shows that an event-driven architectureis capable of resolving the deterministic nature of TradFi operations and the probabilistic aspect ofblockchain networks. Incorporating compliance events into the settlement process enables institutionsto meet their demands for regulatory and transparency obligations. This article sets a roadmap forfuture liquidity bridging models based on a secure, scalable, and compliant approach to bridgingecosystems. This article proves the value that event-driven models bring to the table in terms ofinterconnectivity and liquidity, which will allow institutional-level interactions to take place withinfiat and decentralized networks.

Open access
2 source records
Blockchain Technology Applications and Security
Mobile Agent-Based Network Management
Cryptography and Data Security
Original source
Jun 16, 2026
0 cites
Innovative Financing and Technology Pathways for Scaling Renewable Energy Deployment Across Africa's Emerging Economies

A. S. Edet, Etta Agbor

Abstract Despite Africa's vast and diverse renewable energy resource base, large-scale deployment remains limited by persistent financing gaps, elevated investment risks, and weak project bankability. This paper evaluates how the strategic integration of innovative financing mechanisms with enabling digital and energy technologies can accelerate renewable energy deployment while strengthening resilience, affordability, and long-term sustainability across Africa's emerging economies. The study employs a mixed methods approach combining regulatory and policy analysis, comparative case studies from selected African countries, and techno-economic assessments of grid-connected, mini-grid, and off-grid renewable energy projects. It examines blended finance instruments including public private partnerships, development finance institution guarantees, carbon finance, and climate funds alongside technology-enabled solutions such as pay-as-you-go business models, blockchain supported energy transactions, and data-driven performance and risk monitoring systems. The analysis demonstrates that renewable energy projects that align innovative financing structures with digital technologies exhibit significantly improved financial performance and reduced risk exposure. Blended finance mechanisms are shown to mobilize private capital at leverage ratios exceeding 1:5 in conducive policy environments, while digitally enabled financing platforms enhance revenue predictability, operational transparency, and asset performance by approximately 30–40%. These synergies lower the cost of capital, improve investor confidence, and enable scalable deployment, particularly for decentralized energy systems serving underserved and remote communities. The findings highlight that Africa's renewable energy scale-up challenge extends beyond resource availability to include systemic financial and technological barriers. Effective and sustainable deployment requires an integrated ecosystem where innovative financing, digital technologies, and supportive regulatory frameworks are deliberately aligned. This paper proposes a holistic framework that explicitly links financing innovation with digital energy technologies to derisk renewable investments in Africa. The framework offers a practical and replicable pathway for policymakers, investors, and developers to accelerate renewable energy deployment while supporting inclusive economic growth and enhancing energy security across the continent.

Energy and Environment Impacts
Hybrid Renewable Energy Systems
Integrated Energy Systems Optimization
Original source
Jun 16, 2026
0 cites
Emission Impossible: Cryptographically Verifiable Carbon Emissions Reporting for Cloud Computing

Jessica Man, Martin Kleppmann

Cloud providers need to report to their customers what carbon emissions have arisen from their use of computing resources, so that customers can include them in their own mandated emissions reporting. At present, these reports are neither verifiable nor audited. We show how a data centre operator can produce cryptographic zero-knowledge proofs to each customer that the emissions reported to that customer are accurate, without the customer being able to learn sensitive information about the data centre operator or other customers. Our approach is scalable, costing a data centre operator with one million customers an estimated $150 USD per month plus $0.01 USD for each customer who requests a verifiable emissions report. For customers, a proof is 37 KiB in size, and verifying it takes less than a second. By making emissions reports more trustworthy, we hope to give companies and policymakers the data they need to push towards decarbonisation.

Open access
Green IT and Sustainability
Cloud Data Security Solutions
Blockchain Technology Applications and Security
Original source
Jun 16, 2026·Frontiers in Blockchain
0 cites
Pricing trends of cryptocurrency: an empirical analysis of Bitcoin and Ethereum, 2020–2025

Kai Yang, Jialiang Liu, Yunrui Guan

A current, urgent problem is whether the price behavior pattern of significant quantities of digital assets reflects a single direction trend line or multiple phases that exhibit different structures, adjusted inter-asset relationship differences, and changes in management systems, given the growing importance of digital assets in investment portfolios and collateral holdings, exchange-traded funds (ETFs), new forms of financial activities, and system risks over the period from 2020 through 2025. Because of this period’s post-pandemic recovery, speculative overextension, sharp decline, stabilization, and the re-entry of large-scale institutions into practice, these changes in prices are more clearly identified under such a context. Empirically, this study integrates descriptive statistics, rolling volatility analysis, augmented Dickey–Fuller’s unit-root test, segmented trend regression model with structural breaks, and vector autoregression (VAR) for return interactions. Based on these bases, both Bitcoin and Ethereum have demonstrated a relatively strong direction of continuous appreciation, together with quite considerable regime-specific instability. The log-price series is non-stationary, but the daily return series is stationary; so a level model is appropriate for medium-term trend analysis, and returns-based models can be applied more flexibly at shorter timespans. The segmented trend-regression analysis shows that close to peaks, such as those that occurred in 2021 for a long period, the 2022 correction, and the resumption of investment in 2024, are relatively distinct from the overall linear change pattern across all time periods. Both Bitcoin and Ethereum display pronounced contemporaneous co-movement, but they show no substantial lags via VAR or Granger causality tests conducted in the context of time-varying parameters. This study employs an integrated empirical research approach based on various perspectives to explore the long-term structural adjustment and near-instantaneous cross-market relationship dynamics, as well as regulatory mechanisms within a systemic context.

Open access
Blockchain Technology Applications and Security
FinTech, Crowdfunding, Digital Finance
Security, Politics, and Digital Transformation
Original source
Jun 16, 2026·Zenodo (CERN European Organization for Nuclear Research)
0 cites
Identification and characterization of inference bottlenecks and class imbalance in Transformer-based Smart Contract Auditors

Wathsala Lakmini Priyankara Piyankarage

This research investigates critical challenges in Transformer-based smart contract auditing systems, with a specific focus on inference instability and class imbalance in CodeBERT-based binary vulnerability classification. Layer-2 blockchain networks introduce highly complex architectures that increase the risk of smart contract exploits, where traditional static analysis tools such as Slither often produce large volumes of noisy, rule-based alerts. Recent advancements in pre-trained Transformer models, particularly CodeBERT, have demonstrated strong capabilities in semantic code understanding and vulnerability detection. However, during deployment of a fine-tuned CodeBERT-base model, we observe significant performance and stability issues. Initial inference experiments show a 100% false-positive rate, primarily attributed to severe class imbalance in the slither-audited-smart-contracts dataset and model sensitivity to specific smart contract patterns such as raw Ether transfer functions. In addition, system-level execution profiling reveals a silent segmentation fault during model initialization. Further investigation using Windows OS logs identifies dependency conflicts between PyTorch and PyArrow (via Hugging Face Datasets), particularly related to C++ DLL load-order issues. Experimental analysis demonstrates that modifying dependency import order, prioritizing PyArrow initialization, and enforcing strict model.eval() state management significantly improves inference stability. These findings highlight important architectural and deployment considerations for Transformer-based blockchain security systems and provide practical insights for improving the robustness of automated smart contract auditing pipelines in Layer-2 Web3 ecosystems.

Open access
2 source records
Software System Performance and Reliability
Security and Verification in Computing
Adversarial Robustness in Machine Learning
Original source
Jun 16, 2026·International Journal of Data Science and IoT Management System
0 cites
Block Heal: A Patient-Governed Blockchain Framework for Secure Clinical Data Exchange

Dr. B. Indira Reddy, Naga Siva Jyothi Kompalli, Dr. Rohita yamaganti, CH Sai Saketh · 6 authors

The ongoing digital evolution in the healthcare sector has increased the demand for reliable and secure systems to manage medical records. Conventional centralized storage methods are vulnerable to security threats such as data breaches, unauthorized usage, and potential data alteration, which can compromise patient confidentiality and data integrity. To overcome these challenges, this work presents a blockchain-enabled medical record management system designed to provide secure and tamper-resistant data storage. The proposed system is implemented as a decentralized web application, utilizing React.js for the user interface and Web3.js or Ethers.js to enable interaction with the blockchain network. Smart contracts written in Solidity are deployed on the Ethereum platform to handle record management and enforce strict access permissions. User authentication is facilitated through MetaMask, ensuring a secure and decentralized method of identity verification. Healthcare information, including patient records, diagnoses, prescriptions, and treatment details, is maintained on the blockchain to guarantee transparency and immutability. The system empowers patients by allowing them to control access to their data, including granting and revoking permissions for healthcare providers. Tools such as Truffle and Ganache are used during development for efficient testing and deployment. In summary, the proposed solution improves data security, privacy, and accessibility, offering a dependable and scalable approach for managing healthcare records in modern digital environments.

Open access
Blockchain Technology Applications and Security
Cryptography and Data Security
Cloud Data Security Solutions
Original source
Jun 16, 2026·Journal of Knowledge Dynamics.
1 cites
INFORMATICS TECHNOLOGIES IN SCIENTIFIC DIPLOMACY, IN THE CONTEXT OF CLASSICAL AND CYBER DIPLOMACY

Bogdan TIGANOAIA, Petrisor-Ionut ANGHEL

The paper presents the results of the authors' research for 14 months within a project funded by the Romanian Academy of Scientists. The design, implementation and testing of a decentralized web3 platform, based on Blockchain technologies – including smart contracts and Quantum, useful for education and diplomacy, is presented. The platform can also be used for knowledge management - for explicit knowledge flows. Our architecture allows quantum-enhanced authentication – offering an experimental, but future-oriented alternative to completely classical systems. It consists of a modular, layered structure, which includes the components: frontend, backend, quantum service integration, decentralized storage (IPFS) and blockchain registry. The platform is implemented and tested using several work scenarios. The paper demonstrates the efficacy of a decentralized academic infrastructure capable of harmonizing hybrid security paradigms with distributed storage technologies. Theoretically and technically, the major contribution of this work lies in the transition from a theoretical model to a fully operational system validated through an end-to-end workflow.

Blockchain Technology Applications and Security
Cloud Data Security Solutions
Big Data and Digital Economy
Original source
Jun 16, 2026·Zenodo (CERN European Organization for Nuclear Research)
11 cites
PrismEco, Use Case Demonstration: The Complete Authentication Triangle, Biometrics, NFC, and Zero-Knowledge Proof in One Flow

I. Smid -Woelders

PrismEco is the showcase demonstration of the Prism Ecosystem. Where the other component demos each illustrate one capability in isolation, PrismEco shows the complete authentication triangle in a single flow: biometric authentication via WebAuthn, a Zero-Knowledge Proof generated in the browser, and NFC presence verification via a physical tag. This technical note follows a single user through the complete login flow on prismeco.globalsecurity.nu. At each step, it documents what the server receives and what it does not receive. The goal is to make visible what is structurally invisible by design: that a working authentication system can process a login without ever knowing who the user is. The three factors are verified independently and must all succeed for the session to open. No single factor is sufficient on its own. The combination is structurally resistant to remote attacks: an attacker would need to compromise biometrics, the device, and physical proximity simultaneously. The complete authentication triangle has been proven in a working PoC as of 12 June 2026. WebAuthn registration and login, ZKP generation and server-side verification (proven 10 June 2026), and NFC tap confirmation with RELAY_TOKEN verification (proven 12 June 2026) all function as an integrated flow on live infrastructure at prismeco.globalsecurity.nu. Screenshots in this document are taken from the live running demonstration. All claims are classified by status: proven in PoC, follows from open standard, or architectural design choice. Part of the Prism Ecosystem. Full technical architecture: The Prism Protocol, Invention Disclosure v20, DOI: 10.5281/zenodo.20029291.

Open access
2 source records
User Authentication and Security Systems
RFID technology advancements
Biometric Identification and Security
Original source
Jun 15, 2026·arXiv
0 cites
Beyond the Smile: A Hybrid Convolutional VAE for Crypto Volatility Surfaces

Sadanand Singh, Allam Reddy, Manan Chopra

We present a convolutional variational autoencoder for cryptocurrency implied-volatility surfaces, together with a deployable predictor that combines it with a quadratic smile re-fit through a deterministic per-tenor routing rule. Trained on 6,034 fully-filled hourly Binance Options surfaces of BTC and ETH spanning May-October 2023 and parameterised on a common $6 \times 7$ tenor-delta grid, the model attains a hidden-cell surface-completion RMSE in the 0.94-1.56 vol-point range across both markets and mask rates 10-50%. The hybrid predictor attains 0.83 vol points at 50% masking against 7.00 for the smile re-fit alone, an eightfold reduction obtained at no additional inference cost. Under structurally-correlated hole patterns that emulate the withdrawal of an entire tenor of strikes, the smile re-fit incurs 9.6-13.1 vol points of error while the learned model remains at 1.5-1.9, isolating a regime in which the generative model is the only viable predictor. Joint training on BTC and ETH improves the in-distribution model on both markets by 9-27% relative to the better-performing single-symbol counterpart, indicating a substantially shared vol-surface manifold across the two largest cryptocurrencies over the observation window. The hybrid is calendar- and butterfly-arbitrage-free at the listed strikes, a property that the parametric smile re-fit alone fails at high mask rates. The per-snapshot reconstruction error of the trained model flags the late-October ETF-anticipation rally and the August $17$, $2023$ flash crash as elevated-error periods without supervision. All training and evaluation infrastructure is released to support reproducible follow-on work.

Open access
cs.LG
q-fin.CP
Original source
Jun 15, 2026·arXiv
0 cites
Crashing Together, Rallying Apart: Dynamic Conditional Tail Dependence in Cryptocurrency Markets

Rama Siva Sarwari Mallela, Manuele Leonelli

Cryptocurrency markets are prone to violent, synchronised drawdowns, challenging the claim that a basket of crypto-assets offers genuine internal diversification. Because standard covariance-based metrics fail to capture asymptotic tail dependence, they systematically understate systemic risk and overstate diversification benefits precisely when markets crash. This study maps the conditional dependence structure of the cryptocurrency market directly in the joint tails, isolating direct extremal linkages from those mediated by the rest of the system. We analyse the daily returns of the thirteen largest cryptocurrencies over a sequence of 89 overlapping windows spanning late 2021 to 2025. We apply dynamic Hüsler-Reiss graphical models of extremes, estimated separately for joint crashes and rallies, and benchmark them against a Gaussian graphical model of ordinary co-movement. The results reveal a near-complete and stable lower-tail graph, an upper tail that thins over time to re-form sectoral structures, and the dissolution of ordinary token categories into a single block anchored by a Bitcoin-Ethereum core. These findings imply that intra-crypto diversification fails on the downside, standard risk models underestimate market-wide crash probabilities by roughly eight-fold, and dynamic extremal graphs offer a superior tool for systemic risk monitoring.

Open access
q-fin.ST
Original source
Jun 15, 2026·arXiv
0 cites
Robust and Automated Reconfiguration of Byzantine Wide-Area Replication

Rowdy Chotkan, Bulat Nasrulin, Johan Pouwelse, Jérémie Decouchant

Distributed systems handle adversarial nodes through redundancy, which imposes a significant performance overhead. In blockchain systems, Byzantine fault-tolerant state-machine replication (BFT-SMR) is the replicated service that totally orders client transactions before execution. While prior research has primarily focused on designing novel consensus algorithms with improved performance, recent studies have shown that further gains can be achieved through configuration optimization. More precisely, replicas can monitor network latency to dynamically assign the leader role and tune voting weights, thereby improving consensus performance. However, we identify three vulnerabilities in this process that Byzantine nodes can exploit. To address these weaknesses, we propose Beware, a reconfiguration framework that filters out falsified latency reports, computes robust weight distributions, and applies machine learning to converge towards Byzantine-resilient configurations. Our evaluation shows that Beware reduces consensus latency by up to 45% compared to existing solutions.

Open access
cs.DC
cs.CR
cs.NI
Original source
Jun 15, 2026·arXiv
0 cites
Fractional Verkle Trees: A Hypertree Decomposition and Verified Proof Serialization Architecture for High-Performance Blockchain State Accumulators

Ekleen Kaur, Everton Fraga

Modern blockchain state management faces a critical scalability bottleneck: maintaining cryptographic commitments over hundreds of millions of entries becomes computationally prohibitive. Ethereum's transition to Verkle Trees: polynomial commitment accumulators reducing proof sizes from O(width * depth) to O(depth) via constant-size IPA vector commitments, is a critical step toward stateless operation. Yet, current implementations exhibit pathological characteristics that burden home validators. We identify four inefficiencies in the reference go-verkle implementation \cite{kaur2025goverkle, kaur2025goethereum}: (1) phantom node creation during non-existent account deletion; (2) 64-byte database keys triggering excessive LSM-tree compaction; (3) redundant memory copying in proof deserialization; (4) a Proof of Absence wire format incompatibility causing non-deterministic serialization. We present Fractional Verkle Trees (FVT), a hypertree decomposition partitioning global state into N independent sub-accumulators coordinated by a Merkle commitment tree, achieving improved cache locality, zero-lock-contention goroutine-parallel commitment computation, and faster root recomputation (91 $μ$s vs $\sim$500 ms). We address each inefficiency via existence checks, 32-byte SHA256 node references, zero-copy reference-counted buffers, and HashMap-based lexicographic deduplication. Benchmarks on Apple M1 Pro show 57\% heap allocation reduction (566,760 to 242,004 bytes per 10K proofs), parallel insertion at 2,433 ns/op, and network-wide elimination of 4.85 PB/year across 6,000 full nodes, advancing the Ethereum stateless roadmap.

Open access
cs.CR
cs.DC
cs.PF
Original source
Jun 15, 2026·arXiv
0 cites
did:crdt: Coordination-Free Decentralised Identifiers via Signed CRDTs

Hugo O'Connor, Claire Barnes

Existing Decentralised Identifier (DID) methods require coordination, an agreed global order of operations, to update a DID document: blockchain-anchored methods incur fees and latency; lightweight peer methods (did:key, did:peer) offer no update mechanism; and Sidetree methods still require blockchain ordering for finality. We present did:crdt, a DID method that targets W3C DID Core and removes the need for coordination entirely: there is no ledger, no sequencer, and no global total order. Each DID document is composed of signed Conflict-Free Replicated Data Types (CRDTs), one per document field, each chosen so that concurrent edits merge deterministically. By the CALM Theorem, the state-merge path is then confluent: replicas that see the same updates reach the same document in any arrival order. The signed-delta path needs only causal delivery, applying an update after those it builds on, which is far weaker than the total ordering ledgers impose and needs no agreement protocol. We are explicit about scope: every untrusted-peer path is authenticated, so Byzantine fault tolerance (safety even when peers lie or send malformed data) holds for signed deltas and verified-bundle replay, while the unauthenticated state-merge path is a trusted-domain optimisation and key-compromise recovery is bounded by revocation semantics. We give the data and threat model, CRUD semantics, conflict resolution, and a Rust reference implementation with property-based convergence tests and microsecond-scale merge latency.

Open access
cs.CR
cs.DC
Original source
Jun 15, 2026·In Proceedings of IEEE International Conference on Blockchain and Cryptocurrency (IEEE ICBC 2026)
0 cites
Efficient Data Availability Sampling via Coded Distributed Arrays

Dang Pham Minh, Hung Vuong Huu, Duc A. Tran

Data availability is a fundamental bottleneck in modern blockchain networks. Most blockchain systems rely on a full-replication model, which requires downloading of a full block to verify its availability. This model does not scale with block size because every node must handle large volumes of data, leading to slower block propagation, duplicated data transfer, and longer consensus agreement. This issue is well-known in Ethereum, where layer-2 rollups publish data directly into the chain. To overcome, Ethereum adopts Data Availability Sampling (DAS) to let nodes keep only a small fragment of the data while still ensuring availability. Prior work on DAS has focused on cryptographic foundations. Meanwhile, the peer-to-peer network layer that provides Byzantine-tolerant and scalable mechanisms for discovery and routing of DAS fragments is underexplored. We propose CDA, a new design for DAS based on coded distributed arrays that leverages network coding to ensure both robustness and efficiency. Our evaluation study compares CDA to RDA, the latest DAS development of Ethereum, showing an improvement of several times better.

Open access
cs.DC
Original source
Jun 15, 2026·Digilib Repository Unila (Lampung University)
0 cites
PENERAPAN METODE HYBRID AUTOREGRESSIVE INTEGRATEDMOVING AVERAGE DENGAN SUPPORT VECTOR REGRESSION (ARIMASVR)PADAHARGAETHEREUM

ASTUTI INSYAFIATUL M.D

Metode hybrid Autoregressive Integrated Moving Average dengan Support Vector Regression (ARIMA-SVR) merupakan salah satu metode untuk peramalan deret waktu yang mampu menangkap pola linear dan nonlinear secara bersamaan. Penelitian ini bertujuan menerapkan model hybrid ARIMA-SVR untuk meramalkan harga Ethereum dan mengetahui akurasi model hybrid ARIMA-SVR yang diperoleh pada harga Ethereum. Data yang digunakan yaitu data harga penutupan Ethereum pada rentang waktu 11 Desember 2020 sampai 10 Desember 2025, penelitian dimulai dengan membagi data menjadi data training dan data testing dengan tiga skema pembagian data yaitu 70%:10%, 80%:20%, dan 90%:10%. Hasil penelitian menunjukkan model terbaik yaitu ARIMA(2,1,2)-SVR dengan parameter terbaik sebesar 0.8125, parameter sebesar 5, dan parameter sebesar 0.125 pada skema pembagian data 90% data training dan 10% data testing. Akurasi model hybrid ARIMA(2,1,2)-SVR ditunjukkan oleh nilai Mean Absolute Percentage Error (MAPE) yang diperoleh yaitu 2.83% untuk data training dan 2.72% untuk data testing. Kata Kunci : ARIMA, SVR, Hybrid ARIMA-SVR, Ethereum The hybrid Autoregressive Integrated Moving Average with Support Vector Regression (ARIMA-SVR) method is a time series forecasting method capable of capturing both linear and nonlinear patterns simultaneously.This study aims to apply the ARIMA-SVR hybrid model to forecast Ethereum prices and determine the accuracy of the ARIMA-SVR hybrid model obtained for Ethereum prices. The data used consists of Ethereum closing prices from December 11, 2020, to December 10, 2025, the study began by dividing the data into training and testing sets using three data partitioning schemes is 70%:10%, 80%:20%, dan 90%:10%. The results indicate that the best model is the ARIMA(2,1,2)-SVR with optimal parameters = 0.8125, = 5, and = 0.125, under the 90% training dan 10% testing data split. The accuracy of the ARIMA(2,1,2)-SVR hybrid model is demonstrated by the Mean Absolute Percentage Error (MAPE) values obtained, which are 2.83% for the training data and 2.72% for the testing. Keywords : ARIMA, SVR, Hybrid ARIMA-SVR, Ethereum

Open access
Forecasting Techniques and Applications
Data Mining and Machine Learning Applications
Multimedia Learning Systems
Original source
Jun 15, 2026
0 cites
Health Policy in Latin America

José Ângelo Machado, Natália Guimarães Duarte Sátyro, Ana Luiza Martins de Medeiros

Abstract This chapter maps the scientific production on health policies and systems in Latin America over the past forty years and highlights the main findings on their reforms and the characteristics that shape the various organizational models. Using bibliometric and scientometric techniques, we find a progressive increase in scientific production over the period, a predominance of authorship among Latin Americans themselves, and a lesser prominence of comparative studies in favour of case studies. In contrast, we identify two waves of reform. The first, in the late twentieth century, reinforced co-participation, privatization, decentralization, and segmentation of publics. The second, which began in the 2000s, prioritizes the universalization and extension of primary care, but—despite advances in expanding financing, coverage, and benefits—has not overcome the segmentation of systems and the low integration between levels of health care that still characterize most countries in the region.

Healthcare Systems and Reforms
Global Maternal and Child Health
Primary Care and Health Outcomes
Original source
Jun 15, 2026·Finance research letters
0 cites
Bitcoin option expiration, gamma exposure, and intraday price reversals

Dustin Weiss, Robert Gaudiosi, Z. Ivy Zhou, Robert I. Webb

This paper examines intraday Bitcoin spot returns and trading activity around the expiration of Deribit Bitcoin options. Using data from spot exchanges and Deribit perpetual futures, we document a statistically and economically significant return reversal around expiration. The effect concentrates on days with elevated at-the-money open interest and is strongest when cumulative gamma exposure is negative, which is consistent with positive feedback trading pressure induced by option market makers hedging net short exposure. Trading activity also rises around expiry in Deribit perpetual futures and in the spot exchanges used to determine the Deribit settlement price. These intraday price effects are economically meaningful, implying annual wealth transfers of approximately USD 50 million between option writers and holders. Overall, the findings highlight the role of daily option expirations in shaping short-horizon price formation in Bitcoin markets and have implications for regulated investment products that rely on spot-market reference prices.

Open access
Blockchain Technology Applications and Security
Consumer Market Behavior and Pricing
Decision-Making and Behavioral Economics
Original source
Jun 15, 2026·Zenodo (CERN European Organization for Nuclear Research)
0 cites
U.S. Patent Application No.: 19/693,343

Leon Calvin II long, Benjamin Lawrence Eckenfels

System and Method for Reinforcement Learning‑Based Token Minting and Cross‑Chain Cryptographic Anchoring This archive contains the full non‑provisional patent submission for a unified digital‑asset lifecycle system integrating reinforcement‑learning‑based token minting, Merkle‑structured ledgering, and synchronized cross‑chain cryptographic anchoring. The invention establishes a deterministic, mathematically governed framework for creating, operating, and verifying digital asset states across heterogeneous blockchain networks including Bitcoin, Ethereum, and Solana. The system introduces a blueprint‑based binding mechanism, a formal kernel governed by a unified state equation, and a sovereign ledger enabling long‑term provenance and deterministic replay. A reversible 32‑byte commitment value is computed using a Sponge‑586 invariant and anchored to Bitcoin via Taproot tweaks and OP_RETURN payloads. Parallel anchoring events emit the authenticated Merkle Mountain Range (MMR) root on Ethereum and Solana, producing tamper‑evident, multi‑consensus proofs of state. A reinforcement‑learning engine dynamically adjusts minting rates based on real‑time market conditions, behavioral metrics, and system‑level variables. The system further supports gasless user interactions (EIP‑2771), zero‑knowledge compliance pathways, federated‑learning simulations, and deterministic state reconstruction through Kolmogorov integrity scoring and synthesis restoration. This archive includes the complete specification, mathematical formulations, alternative embodiments, and references to supporting research hosted on Zenodo. It documents the developmental lineage, reduction‑to‑practice demonstrations, and cross‑chain anchoring methodology associated with U.S. Patent Application No. 19/693,343.

Open access
2 source records
Blockchain Technology Applications and Security
Intellectual Property and Patents
Physical Unclonable Functions (PUFs) and Hardware Security
Original source
Jun 15, 2026·International Journal of Creative and Open Research in Engineering and Management
0 cites
A Streaming Data Collection and Analysis for Bitcoin Using LSTM Algorithm

A. B. Hajira Be A. B. Hajira Be, S.Bhuvaneshwari S.Bhuvaneshwari, Sankari.S Sankari.S

Cryptocurrency markets have gained significant global attention due to their decentralized nature and high financial value. Among various cryptocurrencies, Bitcoin is the most widely traded and exhibits highly volatile price behavior. Accurate analysis and prediction of Bitcoin price trends are challenging because the market is influenced by rapid trading activities, large data streams, and complex temporal patterns. This paper presents a streaming data collection and analysis system for Bitcoin using the Long Short-Term Memory (LSTM) deep learning algorithm. The proposed system continuously collects real-time Bitcoin market data from online cryptocurrency exchanges through streaming APIs. The collected data is then preprocessed and analyzed using an LSTM-based predictive model capable of learning long-term dependencies in time-series data. The LSTM network processes sequential historical price data to forecast future market trends and provide analytical insights into Bitcoin price movements. The system integrates data acquisition, preprocessing, deep learning-based prediction, and visualization modules to create an efficient cryptocurrency analysis framework. The proposed approach focuses on improving prediction accuracy by combining real-time streaming data with advanced neural network models. This system can assist researchers, financial analysts, and investors in understanding cryptocurrency market behavior and making informed trading decisions. The proposed design demonstrates the feasibility of integrating streaming data technologies with deep learning models for real-time financial market analysis. Keywords— Cryptocurrency, Bitcoin, Streaming Data, LSTM Algorithm, Deep Learning, Time-Series Prediction, Financial Data Analysis.

Open access
Stock Market Forecasting Methods
Blockchain Technology Applications and Security
Data Stream Mining Techniques
Original source
Jun 15, 2026·The interdisciplinary journal of Discontinuity Nonlinearity and Complexity
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Complex Dynamics and Nonlinear Interactions in Bitcoin Price Modeling

Jules Clément, Gomolemo Goodwill Motloba, Abdulrazak Abdulrahman Abubakar

This paper develops a mathematical framework for modeling Bitcoin price dynamics through a system of coupled stochastic differential equations (SDEs). We capture the complex nonlinear interactions between Bitcoin price and five key factors: investor sentiment, trading volume, mining hashrate, transaction fees, and transaction counts. The model incorporates jump processes to account for sudden price movements and regime-switching to capture state-dependent dynamics. We derive the resulting partial differential equations for derivative pricing and analyze the system's behavior through simulation. Our empirical findings suggest significant feedback mechanisms between network metrics and price dynamics, with hashrate exhibiting the strongest correlation with price movements. The framework provides a foundation for understanding the complex, non-linear, and fractal-like behavior observed in cryptocurrency markets while enabling the pricing of derivatives in this emerging asset class.

Blockchain Technology Applications and Security
Complex Systems and Time Series Analysis
Economic theories and models
Original source