전자계약 보관 시스템에 법적 증거력을 부여하기 위해 두 가지를 동시에 구현해야 했다: 블록체인 Merkle Tree 앵커링 — 계약 해시들을 모아 Merkle Root를 L2 체인에 기록 RFC 3161 TSA 타임스탬프 — 신뢰할 수 있는 제3자 시간 증명 간단해 보였는데, 삽질의 연속이었다. 1. RFC 3161 TSA란? RFC 3161은 Time-Stamp Authority(TSA) 프로토콜로, 특정 데이터가 특정 시점에 존재했음을 제3자가 증명해주는 표준이다. 흐름은 간단하다: 클라이언트 → SHA-256 해시 생성 → TSA 서버에 요청 → 서명된 타임스탬프 토큰 수신 무료 TSA 서버들: ...
This documents the problems encountered while implementing a pet profile avatar selection feature (image or color) on a Rails 8 + Inertia.js + Svelte 5 stack. Problem 1: Colors Were Not Stored in the DB Symptoms Looking at the initial code, pet card colors were displayed like this: const PET_COLORS = ['#f3caa1', '#b7ddf9', '#d3c8ff', '#c5d5f4', '#ffd9aa'] function petColor(index: number): string { return PET_COLORS[index % PET_COLORS.length] } Colors were determined by the order (index) in which pets were created. Since colors were not stored in the DB at all, even if a user changed a color, it would revert to the original on refresh. ...
I received a report that sign-up and login were completely broken. The app just repeated “An unexpected error occurred.” Symptoms Sign-up attempt -> 500 Internal Server Error Login attempt -> same 500 Health check API -> 200 OK, DB connection normal The server was alive and DB was connected, but all authentication features were dead. Investigation Process Step 1: Check Server Status SSH in and check the Rails environment. rails runner "puts Rails.env" # => production rails runner "puts User.count" # => 13 Server normal, DB connection normal, user data exists. ...