Mark Tuan (born Mark Yien Tuan (; ); September 4, 1993), also known mononymously as Mark, is an American rapper and singer. He is a member of the South Korean boy band Got7. In 2022, Tuan released hi
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 0x503857cc3a8ec382737ea0e73bfbc67e8613ab9ac09c1f830af1648da46f2641. 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/f02dfac7-7d39-402b-8c51-e206101be06b.json and https://artists.proofprofile.net/proofs/artist/f02dfac7-7d39-402b-8c51-e206101be06b.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 0x03e62363d83c3c123a0e4317caf5f32000d9198736a4891131308e729c353bea. 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/QMFF92000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65428747b7171d074570fd01b1dabe954412633f4e0b60c114bd8679d1189c94. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/HKG732264614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06afa2ad78039f785040068fb7d66a94c8390b6483d0d2d819edea9c8c62a0c9. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/HKG732264615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8545ca20ba2c5d3f283d6530d9263c2096856e9c32d40484831376c92ab767e. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/HKG732264616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf099e1a220f3d3e1854ded964fe4e70c6bfbbdbc9f05e89d574abf8154f1a084. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/HKG732264619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3929d700e7c1c2a3ef3b6d1dddb18b8c280e64291c24438e8025dd2edf7c93c8. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/HKG732264621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a92b7eb52531439c1fb1ef913bd707335df03f52641dd3a4aa2981bf1a9410b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/HKG732264624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1466bd32941165ab4d2df85a423a5ab7e8ce629ce1d0cb1dd2cb6d1eb22eb8ec. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/HKG732264626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1033ca806fc5fcf1885af16ecec2301575e33e6f862bcb028e7c5dc716deb3. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/HKG732264627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefacb78a56411cd79d3fd76245f4f6aa7924143faa8a218d419e346777a8475. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/HKG732264632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e6fd48416dedc429994bd24876398bf62e0bbc57b5da5b500c069860e541da. 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/US5TA1800076.
Shang-Chi and The Legend of The Ten Rings: The Album
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b37fbcfbb9dc832ad19682878629b91f5c80f24ab9ebbcf5c4f4daf137052fd. 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/USUM72113052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2742fd3c7b220916bd4e6c28497cb3153f47ceb2e4a375026f392b386a784a6. 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/QZH6S1900956.