・SPIN : https://spin-project.org/
・SPIN開発秘話：https://prtimes.jp/story/detail/ErQk9DIX6RB
・LOCAL LETTER：https://localletter.jp/articles/spin_freewill/
・SOCIAL INNOVATION ACADEMY：
http://www.socialinnovationacademy.eu/blockchain-for-social-impact-increasing-trust-and-security-in-social-projects/