Lee Yoon-sang (; born 11 May 1968), known professionally as Yoon Sang, is a South Korean composer, record producer, singer and songwriter. He currently serves as a contemporary music professor at Sung
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 0x082fa648e563c857152821b35e988daf76614c67f02305a67b2394768bef8c08. 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/c71a15d8-922e-4c3f-8902-f4becee01270.json and https://artists.proofprofile.net/proofs/artist/c71a15d8-922e-4c3f-8902-f4becee01270.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 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 0xd64c9368bddf46ddc1ac90a205910c040f065f37c2ee5e8ea1b3ceff1e844cd8. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZEKE1801613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3efac40db2de05c373ff618ab34b3de8dc5b38c242ea49298ddf8224e3d70e5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZEKE1801614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd518e5d5f10b33936e0f83f04ea046e2d6a86b037b211116d601413f4359d3. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZEKE1801615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4259807232580a07b7cf0d9e99807e552c23484571795aaa398ddbf975c70dd. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZEKE1801617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f82b1ac7db79e7f860a41d5b2279fd800f320a55498798343d0846929c48334. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZEKE1801621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474ff0e6a728ab83e1d82f974036faf9b7b18bc0f791e3f2db4486e02c8ff01f. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/KRA340913389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fe02b5cc92cc9a35020b0a67162c1d2294dbd513377e6c0825ced2b66bfebc. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/KRA340913394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa552a55ba2d0f8ea24a0d7617ce569cf78c55264069ae73c2adc9459320f6a6d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/KRA381001435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65f56c590e95427f8131627038781ff1ed345e3b385943561eff928cc928965. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/KRA381001410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be018056916f9ab189623cc08b473c3a0ca8fdbeac7a6c09c4774a3d308934b. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/KRA381001413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aeab75e23dd78e61430da955a3c70954bb4f36569413a5adeb85606789ea109. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/KRA381001440.
Caught Between Marriage & Divorce Season 2 BGM Playlist - Produced by yoonsang
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ded1316c12794c08534838fde8cecd77d59e47f773d32525ce2df22e24e7ed. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/KRA381002289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6dd73439a1c4753b865003d848411f2db3a24a165c8c56ea8fe9fab0052d354. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/KRZ291610197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3267e1d86945d394125107c0a9de8adc1b30016eb69cc60b02f7038284be9a24. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/KRZ291610207.
You, give me all the burden (Vocal yoonsang)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee89dc99494440c0a65bd7ab754185a4c0d9bfbcdaf4298ef770f02c56a0b79. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/KRA382204968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659a655c52019337c282027242f110da514244bc373c41c58d8387c310aa8f1d. 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/KRA301900349.