Kwon Sung-hwan (; born May 27, 1989), known professionally as Peakboy ( ), is a South Korean rapper, singer-songwriter and record producer. He released his debut single "Gin & Tonic" in 2017 via Sound
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 0x54541dd2934a9fdddc1546eb9824f4c322dfdaf73f3a7024a6f2affdd0ee0781. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fcd68a2-504d-4f85-9ae1-57141ffa7735.json and https://artists.proofprofile.net/proofs/artist/8fcd68a2-504d-4f85-9ae1-57141ffa7735.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 0xe5130c71ab536c1683d8d2ae6fd1cef5a686f0c206a5bbd97387c3350d9f6feb. 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/KRNAR1803462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aee1c863fbcdc73c4e0245079e010ab5136954492564b4031ff895c0decf622. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/KRNAR1803463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b3e97c07771ee76e6b7b985514dba779c89adcd4f1181ea684d58c79c26035. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-21T16:27:21Z), 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/KRNAR1803464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bd2145fb66b4fa901b72d81a550822fab09f23db97e405eec821bde49d7176. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/KRA381901551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49dcf3c32d06be50e8a0561866e8df25548caa07eeda5ddd11180c78a90d837. 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/KRA381901552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2250bfd5a4cf9e5cdcfd5354393dc1739f7127461e5b050b593eb48c7f9cd4c5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/KRA381901554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbedc31ae7c370ae10398a43081cbfe55ebec05f6f535562af0a8810a3d755e4e. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T14:51:33Z), 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/KRA381904106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00fe4ad8b4d17724c1204f3e11c64041a00dae2f83457eedcf36e2f57f3d06c. 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/KRA381904726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6693f11f99e23b84700fec84aebda558351e92c9c92de334c285e238584deff. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/KRA382003460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bc95fcddc7709fc55c9ef9d3f0d73a198c9127b1f7cf9cb51ad0aa6b7add0f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/KRA382003463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1655274cddeae070a5d4e21e811d47f4faacb0286dd75dc7003389fb0183bf47. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T04:45:37Z), 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/KRA382006822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9329bf7981b8ce8065de41deeac03eab78981f86b05687dd579061ae77c8b0. 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/KRA382102819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1df791ff13488eab7c857cdc9d1f3c65c261682237c7df5b5a61f15443e3291. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/KRA382205055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c45fa3715ff2aa1d0f87642ed37798c9a752440f7091fdacba0bd8e8e53d3d. 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/QMFMF2041669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd141f83fcdaca1b4bb6035a35e9cf08e100f7cd55877d60f22e215a1b6a0a2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/KRMIM1903454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8055980289c3ba25020d7fd70815a22deb0fcc719ebc0ebca6588d82078c553b. 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/KRE021900384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0dd3a4ddb50ebb86cca08520d663afc8aacb7da426753d9dfd5fb496cf7672. 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/KRE021900389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fedc0cc3c803700b495b7cef2bbbbdd4e1d0abe663be0e25aa923a2d0778c4a. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USCGH2026401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424d9b5168d3b5e75041c81e09320050c936dbc691ef149b398c0b5ee74e5981. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/KRMIM2102533.
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 0xe53af4a4887195fc7857eba3854339290552da5bce1f86b1bd19136067113f95. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/KRMIM1922805.