Jo Hyun-soo (; born September 29, 1993), better known by his stage name twlv (, pronounced "twelve"), is a South Korean singer-songwriter and record producer. He began his music career by uploading so
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 0x4070684f065b985b7831fece92fa1551e558c689438fc512f239892f48eedb2d. 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/d24f8c52-432d-462c-a830-55f40aea145d.json and https://artists.proofprofile.net/proofs/artist/d24f8c52-432d-462c-a830-55f40aea145d.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 0x2d04c0945f2cd3e0411437832d45794828768a43336b3b1f45b0cf84c18c57b2. 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/ZZA0P2404149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf096273a624796937f1ffc6947dd5d8ce34f9a36627450e2393bd89ef2c4d0. 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/ZZA0P2404152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f21039a5eaa70f04e4f9b8702033e7ee04c5c917c59adb72bb5d7b99b7945fd. 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/KRNAR2235169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7c73d96353f85efd344f820696a844ceb6830e48109d9353c9a343fc0d086c. 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/KSA012153717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cb1925650a9239c62bb2dea456332e0daa09354475f745865ab262f2bb0a16. 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/KRA382000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ef7199d5442f47eed0248505484532dcc44551e041ef0604cfe7d56d44f938. 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/KRA382000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c90ae9d7557fddce2d0fdfaa29992f77105103698227a41c864bd25e465424. 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/KRA382000051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21636a0af7b9b903222bf16e213dd7d000c2ce47957157d9da12b95dc0cba77c. 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/KRA382000054.
The sword of Aramun, Pt. 2 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c3322997ba90e877124d7349be919e94988c8deff05dcfb9618c9db18845d3. 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/KRA492300882.
Bad Prosecutor (Original Television Soundtrack)
Hugs & Loyalty (feat. Reddy, IV & Owell Mood)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa2e1d03aa7929ac213099e59f556c1e6e5059b67aaa4be4c50766ac510d9ab. 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/KRMIM2246090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9da2d318fddfc871bb57fd570896e5175232115af16f45ca0d3bbe83843975d. 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/KRMIM2129082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00388114389e8ce098da2f7c7490279ff445bfd47e43d2840893a30a4ef23602. 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/KRMIM2118252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd73d6edf6cd8c683ccb5070e0422082ece7ea56a717897f281eba0aa09be990. 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/KRA382003387.
8282(Party) (Feat. SUPERBEE, UNEDUCATED KID)
8282(Party) (feat. SUPERBEE, UNEDUCATED KID)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda93fd78a6090f6b8905670f10b5f83a3315736f424645aa2d572a1a4866574. 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/KRA381903800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4198a6cefbeed2eb3ddac0fdf9886531854d71430007c673fe1ae0f398483e01. 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/KRMIM1912102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c3cfe44f2328ea2c30fbcc8402f68527bcb336830cb4d1a15d57027c028b01. 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/KRA381900727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e66e16b313dcd366d4193d36092e1a7722fe299fc3b8637d890c195e6a7961. 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/KRA381900728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa0e3c58082ed265eb32a9b8c0c175f32aee45ff9c98079ed87cec0ddbb4b81. 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/KRA381900729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2485d913b560b9580b849ac09070d6aab85ead735ad51c9809ac3a6d767e8b4d. 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/KRA381800449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06f7ca3d5989a04f84a867acc9c81d53ac91559026a7663f4e4dea87971d453. 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/KRA491800606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9fe2cbed79bb0c8081937866fa86f28ff56d7aae1835b1e534c2e0271dde40. 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/KRMIM1803008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a86f37731ee3c79b0600e625fcd8475c968892d11261a45a83d8b2fcc7d8a5. 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/ZZA0P2520683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860509f725c09c95132bbe242e41500a017193536773965af1d3cd3a6936fd70. 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/ZZA0P2502652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98c25d4e1323c37d808d9633cf97f3af38f9bb836576e17dc09a1dc945dfcc8. 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/KRMIM2016286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fab3d9eee3929366bf8c143565ad5bc8ab996466bc0836c09aff882b5331c65. 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/KRMIM2010687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd520ade9f4defcbf040d7ed0bcf951fdbfc71473a5ac1a69317bf119420b42. 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/KRA382005883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3389d392344d2d2bd945f3c06ac07df480cbd2f15bc3dcbe5e1edfe5151a42d2. 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/KRA382006255.