Mark Blair (born 27 November 1974) is a British racing driver. He started his racing career in karting in 1986, and represented England in the 1990 World Kart Championships. In 1992, he switched to ra
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 0x60192612f01207bb13a1679e750058695b2f25c0ec03932eea8ace78d001c5e6. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d9b89df-0edd-4118-9d35-8c96a9fb4b77.json and https://artists.proofprofile.net/proofs/artist/0d9b89df-0edd-4118-9d35-8c96a9fb4b77.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 0x8f9c7812506bad8109f95369956507381aeaf513d5c484056cc0653c17f994f3. 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/QZTBB2303159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e21543028c4f1231d4046341bf3e31565bbca218e3d4609f850a4282586704e. 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/QZTB22328019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8545f45de5fa7b41965eef6f87552094a08f2d4fb20435bfcd9d3a6bc89490. 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/QZTAZ2366327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2744555084404bbd3b93d004e419e9e6586ba2eee2a6cf972536907ad0d59422. 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/QZRP42323515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcc2c4c5abaa7b4cbfb01bb659c9914b06986eb2a165bc1de668b14133052d6. 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/QZK6F2390583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62560a299011a0fa5af5be5ebfc13984544d98c4b451a12d765da35d4b9fffee. 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/QZHN42392107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e9e6efbd447ef5b667bc6703fc69c0c58c76ab0a19496453828944a193bf34. 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/QZES72379852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3076cd17a2cc48f173746a605d861f5bfeb47b5ecf70d3a0e6441bc09c5f267f. 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/QZES72379853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2249ebe30ee70b7c3a2b8e6e465917c1ce90330c03cd2781431468110a97d488. 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/QZDA52331276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdedf22b38d4caf4ff82438beddaa21bb7109d948d928c8b0874905b92a47d96f. 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/QZFZ42326355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50161c766129f80fe17b04b6376ee17fc5a538574a6ec7eeacb668aba6f2119. 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/QZTB72272806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf30cd4b2fcc842548acbe5e2b87943cb307e59d213f436dd54ca668930a2c97. 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/QZTAU2241802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec37c9efeaf2a880f23e0848b9cddfd3e810e1d5fc39b476d290532e6b98ee5. 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/QZMEQ2292197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734cfd474d503daeabd0434442f047870ea1825ba266014abd168dc64091eff3. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZK6L2291032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd3bb5cd3c492c37d949230bfa8d0e4441ba137cafd625d7c2d2dc561ff21ec. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZK6L2291033.
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 0x76ace2f42e8b4d9ee2d66f38fecebdfa1c0b5bcebf78571712f8fdf757e6370c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZES82292704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4171d8f96bd4aeb5c3dca0cd4044afc3c54120c2f8c18c1e147ec215c479d7. 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/QZES82292706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbd14bd0b44ca09c9d3d2835d46d9c9f3e350c5a539e5aafa85e69e9e0e4b21. 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/QZDA52257235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe8479e084ba9c52a76a8d962ca8286fab51cc9778c9b7564683fa53c71f600. 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/QZNWV2162810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7ee5002e85cae3f1211893a8387b04e2f1e6b549514659aecd184c3f5b5877. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UKN6K2003330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e33d1cbb4ca18768cb3ca436920b3f7b370f7abc23768d5c3e4fa2f4dbb66c4. 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/UKN6K2003332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf563298f41889111d7b804ec775aea83aff8a41ae84a02443c719a6087f7c10. 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/FR59R2132736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c4b21930e1fa4eb061a4cea874655eafa0f4dc0be9395f7588e353660b88b3. 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/QZHN42193245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e6293355ed9e80fc36b75e47fc5d93a8c7602844e8a269118a1685c3c7f33f. 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/GBJX32163008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba663f7f7cb2d50e1f9e2f182b09386c037bc3b6ba4ee0eec08acf0f7520095. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/GBJX32163009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3004def7d4120695e995fa0df725dbe78f2beca09500e5a0f7328ea1f5d44ddf. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GBJX32163010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4857ce275156bf273685f91ba1deb620a12eb9970b5c8e0e2e9906dc09396b88. 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/GBJX32163011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f07f191c976195b3e8fb88ec9acfba6cf1ba005de644c00903dcabf0f93afe5. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZNWY2047988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2e60563f0c9388937612cbbe381d18980fcb45f7a118a1fb61ab7ad15138b2. 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/QZNWR2020611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b78ac1bc3f5fabda5732ff270768187109443df5749a6b3a8b61650d24d1073. 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/QZHNB2062745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c9c7f57022dcac7d139ad5d1d214a6c5e2033c7b28d33e635de1dd45f9d23c. 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/QZES82093526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea5ca806f5724f86a088311da1ae91b3fd58b7e59702f40aa1fb48055d0c8cc. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZFZ22052544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6833b501be651594f75a66630e554303b6472667193ce072d70c13b00816c3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZFZ22052545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed66a8aa0147cf2784b1cb3f6c1d42451e2f9723cf9c10ba5ce37f239b525231. 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/USA2P1888863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446eb12ea407cccde7807da9db5bb1ea39a5972f7a1bc8d178ed680a49f9f851. 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/CACWV1839465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff4548275dc4597f1fc03675400101d0ba646fd7396dab82eddf4b8e1ad4f40. 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/QZTRX2495550.