Ryu Sang-gu (; born 1984), known by the stage name Deepflow () is a South Korean rapper, music producer, and CEO of the hip hop record label Vismajor Company. He won the award for Musician of the Year
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 0xb7bcf2f9ba06f62bcf4b57375e22dfd7c34a8aea97b8ecdb7fafa5bcdd24ff89. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d64dbbc-eb43-4621-a04a-e0fcb9446782.json and https://artists.proofprofile.net/proofs/artist/6d64dbbc-eb43-4621-a04a-e0fcb9446782.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x0eac17553427f8c651cb09e5cfa39619690d89c6db225a2e3c11f09fcdc910b0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/KRB471900022.
Cut Cut Cut (feat. Nucksal, Huckleberry P)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4567115bdc2c4c8fd587ed0db8b9dbc44cc9b383206a733d9665cc76a9bae645. 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/KRB471900035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ae920d2ce535be67e6a164a08d1f3c0100f1a06a541c035f1139f35bf923a1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KRB471900036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9a3e5e9ad1ad4aa30441a098fd40d4bf5828aa179a158ef9278cb913c417f3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/KRB471900040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037d0ba046ad25c7617879d43460e21b48a43b29b6fe9cc773a07b6dcde376f8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KRB471900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd924ebbbee411ebbda7492b64399cea2cf1eee75dac3a3637a412dcf166c1a19. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/KRE502000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457d32df4a115b89e29aa6e2e82ed023072061ae3cdc051e3a36bab77bd9ddb2. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/KRE502000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6325b59dc061e8967a9c356576d7cbf334086cf7d8306d6155c5fe668586424f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/KRE502000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2507ea100c6d4b7c85be76e03c62a733f03d5879b4eee9bad6d9a1bf9f19cf9c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/KRE502000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad330a58f0b1d5813fe9f7e237a7de1dece07483c1d132f7aba30a029a82f30. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/KRE502000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7678d4ab9c5aaa4c5797d6702fd530db284742212f789d18073e989ea74b058f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KRE502000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8815bcf28865ee8bcf1b560531b8f14eda55042f0f44c7f23fe7307e2e9a7d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/KRE502000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7270c6b730dfbfe5da96a079ef28bff5cb51761bfff00c059fed4149a08b993f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/KRE502000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270adaffd80e402e8a86590096291efc03ace612a5367a791dffac4892a41998. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/KRB462301228.
Mills Gon Do It REMIX (feat. Woodie Gochild, ZENE THE ZILLA, EK, BILL STAX, ODEE, Deepflow, 창모)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25797535a55cd7552f0db4e92dbe9a960ec62e0787cec136f22c35c3f701764. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/KRE501800005.
Visty (Feat. Wutan, Hwaji, Deepflow, Don Mills, Rohann, QM, Big One, Nucksal, Odee)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398bf854b7d98797ad54e2954b856d7eb2d002d0066f7c58de0a9ced4177804f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/KRMIM2444262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a92946fa11664e6d853a656a0492b2b3909bc4730e7d199d441cbdd2f47c99. 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/KRC711800054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa549afd77c1ac1a24543f23e38668a1e47d189f57f74737682d209d98c8326ce. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/KRA381500208.
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