NO ENTRY FEE IS REQUIRED TO PARTICIPATE IN OR SUBMIT SOLUTIONS FOR THE TEN (10) PRIZE-BEARING CTF PUZZLES. K4 submissions may require payment of a $1 submission fee through Stripe or another payment method or payment processor designated by Sponsor, but no prize will be awarded for K4 unless Sponsor states otherwise. To participate in the Paradigm CTF Challenge (the “Contest”), eligible participants must visit http://paradigm.xyz/kryptos-ctf during the Contest Period, create or log into an account if required, agree to the Official Rules and applicable terms, and submit a solution to one or more cryptography puzzles or challenges in accordance with Sponsor's instructions. This is a skill-based cryptography puzzle contest. Winners will be determined based on objective skill-based performance, as described in the Official Rules, and not by random drawing or chance. The Contest begins when Sponsor announces that the Contest is open on or about the morning of Friday, June 12, 2026, and continues until all ten (10) prize-bearing CTF puzzles or challenges have been solved, Sponsor ends the Contest, or as otherwise described in the Official Rules. The Contest is open globally, except where prohibited by law or restricted by sanctions, export controls, or other legal restrictions, to individuals of all ages, including minors, subject to the Official Rules. If a participant is under eighteen (18) years of age or under the age of majority in the participant's jurisdiction of residence, Sponsor may require parent or legal guardian consent, documentation, releases, KYC or identity verification, tax documentation, payment information, publicity/IP consent, sanctions/export-control screening, and other verification or fulfillment materials before participation, continued participation, prize eligibility, or prize fulfillment. Participation may be by individuals or teams, as permitted by Sponsor and described in the Official Rules. One or more prizes may be awarded, including $1,000 USD cash challenge prizes for PK1-PK10 / the ten prize-bearing CTF puzzles. Total ARV of all prizes is up to $10,000 USD. No prize will be awarded for K4 unless Sponsor states otherwise. Sponsor may require winner verification, KYC or other identity verification, tax documentation, sanctions/export-control screening, payment information, parent or legal guardian documentation if applicable, and other required documents before awarding any prize.

Official Rules: paradigm.xyz/kryptos-ctf/official-rules

Sponsor: Paradigm Operations LP. This Contest is not sponsored, endorsed, or administered by any social media platform or other third-party platform or service on which the Contest may be promoted, accessed, administered, or discussed, including X (formerly Twitter), Discord, GitHub, Stripe, or any other third-party platform or service identified in Contest-related materials. Stripe or another payment method or payment processor designated by Sponsor may be used to process K4 submission-fee payments, if applicable, but no such payment processor is a sponsor of the Contest.