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Verify a decision

Every moderation decision on AVOID.NET is anchored to the Solana blockchain. You don't have to trust us — you can verify cryptographically that we committed to a verdict at a specific moment and have not rewritten it.

How verification works

  1. We commit. When a moderator accepts/rejects a submission, we serialize the decision into deterministic UTF-8 bytes (payload_canonical_string), hash it with SHA-256, encode the digest as base58, and write it to Solana inside an SPL Memo v2 transaction.
  2. We store the bytes. The exact bytes we hashed are stored alongside the decision in our database. Anyone can read them and recompute the hash in any language.
  3. You compare three values. Database hash, your independently-recomputed hash, and the hash inside the on-chain memo. If all three match, the decision is authentic and timestamped.
The on-chain memo format is AVOID.NET|v1|h:<b58-sha256>|d:<id>|t:<iso>

Find a signature on any investigation page's decision log, or run python -m src.verify_decision --signature <sig> for a CLI check.

Decision
publish · GDAC
View on Solana ↗
Sequence
#1
Score
Cluster
mainnet-beta
Slot
421041180
Off-chain at
2026-05-20T18:36:40.313Z
Anchored at
Block time

Independent verification

1. Database (off-chain)
ZimCUprNozk6X9GWr38RgqXMUdiJMBEhgoqQTVtsWPB
2. Recomputed (your browser)
computing…
3. On-chain (Solana memo)
fetching…
Canonical bytes hashed (4076 chars)
{"actor":"system:backfill","investigation_id":"3f9c6113-47e0-4ee0-ba5a-58c66689389f","kind":"publish","page_slug":"gdac","published_at":"2026-05-20T18:36:40.239Z","sequence_num":1,"snapshot":{"content_type":"investigation","entity_name":"GDAC","sections":[{"content":"","heading":"","severity":"medium","sources":[{"credibility":3,"name":"","type":"other","url":"https://peertec.com/we-are/"},{"credibility":3,"name":"","type":"other","url":"https://www.crunchbase.com/organization/gdac-peertech"},{"credibility":3,"name":"","type":"other","url":"https://www.cryptowisser.com/exchange/gdac/"}]},{"content":"","heading":"","severity":"medium","sources":[{"credibility":3,"name":"","type":"other","url":"https://www.coindesk.com/tech/2023/04/10/s-korean-crypto-exchange-gdac-hacked-for-nearly-13m"},{"credibility":3,"name":"","type":"other","url":"https://www.financemagnates.com/cryptocurrency/south-korea-crypto-exchange-gdac-loses-23-of-assets-to-hackers/"},{"credibility":3,"name":"","type":"other","url":"https://decrypt.co/125834/hackers-rob-south-korean-exchange-13m-bitcoin-ethereum-other-assets"},{"credibility":3,"name":"","type":"other","url":"https://cointelegraph.com/news/south-korean-crypto-exchange-gdac-hacked-for-nearly-14m"},{"credibility":3,"name":"","type":"other","url":"https://cryptoslate.com/korea-based-exchange-gdac-suspends-withdrawals-and-deposits-after-13m-hack/"}]},{"content":"","heading":"","severity":"medium","sources":[{"credibility":3,"name":"","type":"other","url":"https://www.chaincatcher.com/en/article/2166179"},{"credibility":3,"name":"","type":"other","url":"https://sumsub.com/blog/south-korea-crypto-and-travel-rule-regulations-all-you-need-to-know/"},{"credibility":3,"name":"","type":"other","url":"https://www.thekoreanlawblog.com/2024/10/registering-a-virtual-asset-service-provider-in-korea.html"}]},{"content":"","heading":"","severity":"medium","sources":[{"credibility":3,"name":"","type":"other","url":"https://glavx.org/gdac-crypto-exchange-review-what-happened-and-why-it-failed"},{"credibility":3,"name":"","type":"other","url":"https://www.coinspeaker.com/gdac-deposits-withdrawals-14m-hack/"}]},{"content":"","heading":"","severity":"medium","sources":[{"credibility":3,"name":"","type":"other","url":"https://www.coindesk.com/tech/2023/04/10/s-korean-crypto-exchange-gdac-hacked-for-nearly-13m"},{"credibility":3,"name":"","type":"other","url":"https://www.financemagnates.com/cryptocurrency/south-korea-crypto-exchange-gdac-loses-23-of-assets-to-hackers/"},{"credibility":3,"name":"","type":"other","url":"https://www.chaincatcher.com/en/article/2166179"}]}],"sources_used":[],"summary":"GDAC was a South Korean cryptocurrency exchange operated by Peertec Co., Ltd. that launched in May 2018 and was registered as a Virtual Asset Service Provider (VASP) with Korea's Financial Intelligence Unit (KoFIU). On April 9, 2023, attackers drained approximately $13–14 million from its hot wallets — representing 23% of total custodial assets — causing the exchange to permanently shut down with no compensation offered to affected users.","timeline":[{"date":"2017-12","event":"Peertec Co., Ltd. incorporated in Seoul, South Korea.","source":""},{"date":"2018-05","event":"GDAC cryptocurrency exchange launches.","source":""},{"date":"2018-09","event":"GDAC opens Korean Won (KRW) fiat trading market.","source":""},{"date":"2023-04-09","event":"Attackers drain approximately $13–14.2M from GDAC hot wallets at 7:00 a.m. KST, stealing ~60.8 BTC, 350.5 ETH, 10M WEMIX, and 220,000 USDT — 23% of total custodial assets.","source":""},{"date":"2023-04-10","event":"GDAC CEO Seunghwan Han publicly confirms the breach. Exchange suspends all deposits and withdrawals. KISA, KoFIU, and Korean National Police Agency are notified.","source":""},{"date":"2023-04","event":"GDAC permanently ceases operations. No compensation plan announced for affected users.","source":""},{"date":"2025-02","event":"KoFIU confirms GDAC has been removed from the South Korean VASP registry, alongside ProBit and Huobi Korea.","source":""}]},"v":1}