Ryu Si-won (; born 6 October 1972) is a South Korean actor and singer. After he made his debut in the KBS drama Feeling in 1994, Ryu pursued a singing career. Early life Ryu was born in Andong, North
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c08edcca5551de25e589a81e13927a74c7cc5f56b48f6a69381e6e6d92af3d. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62d6b62e-b539-4036-abac-7489c3a04ad7.json and https://artists.proofprofile.net/proofs/artist/62d6b62e-b539-4036-abac-7489c3a04ad7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Siwon's Racing Diary Season 3 (류시원의 레이싱 다이어리 시즌 3)
Siwon's Racing Diary Season 4 (류시원의 레이싱 다이어리 시즌 4)
Siwon's Racing Diary Season 5 (류시원의 레이싱 다이어리 시즌 5)
Siwon's Racing Diary Season 6 (류시원의 레이싱 다이어리 시즌 6)
Siwon's Racing Diary Season 7 (류시원의 레이싱 다이어리 시즌 7)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82a41eee9b6f97d018d77f1261195703db57e959afd90e9131005c9410ed67f. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB601247707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cede664c86d30ac3b5ebafe695eb01c172f20fa841af1f7d66c20892a5275e0. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO01620136.
Ryu Siwon 20th ANNIVERSARY COLLECTION～いつも春～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f33184adaefe4ebead4d1d17d5735a2d38c1ad992e06dc122d2d092974f7557. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTK00501680.
Ryu Siwon 20th ANNIVERSARY COLLECTION～いつも春～ (Copy)