Cho Seung-youn (, born August 5, 1996), known professionally as Woodz (; stylized in all caps), is a South Korean singer-songwriter, rapper, and record producer. He rose to fame as the main rapper of
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771d16c6c7e08194c4be9d230f89b95d35f120f5bfc64a1bd524f0a984b209c1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09e1b956-601a-4f97-8ecc-d126432ec3dc.json and https://artists.proofprofile.net/proofs/artist/09e1b956-601a-4f97-8ecc-d126432ec3dc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sing For You- 7th Challenge - Eating Alone
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a784be2896188b18dcc38c6750170bcb12abbe4c592fe943e30ad797e34fda. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/KRA341747650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24d8fb13c9d38330f86e81194d08d9db5381d9160c8d5d616c1896a9a7afbd1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/KRNAR2327052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f17ad20860220d10718e0a0ee7bce507a3a3d704bc5c55d48dd03e29b8a084. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/KRMIM2144788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f17ad20860220d10718e0a0ee7bce507a3a3d704bc5c55d48dd03e29b8a084. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/KRMIM2144788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb16db5fe8cff85006ce3d79eca441a1dc9d9df85f459ef39fc8e1b502f974c4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/KRD441800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cd234e99024eb217b5e81278c3e75b14255c4fa77abe755699c0160d7b7447. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZF452001982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84490948ab22852507167cf043ddd76c1c441e65934634c2b72182cbafde13cc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/KRB462200792.
YUMI's Cells 2 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71d9b2b564591fd59e6398c985471cfdffcef104f6d3e9f942a14357c259bd0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/KRA492200552.