Christopher A. Haigh (born 28 August 1944) is a British historian specialising in religion and politics around the English Reformation. Until his retirement in 2009, he was Student and Tutor in Moder
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 0x10c6c55c25208976debdaefd1eebbbf0dd946bc079d765622ced1e4e0491f385. 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/98eb2e5b-97b4-4813-85e2-e1ec352fb1d5.json and https://artists.proofprofile.net/proofs/artist/98eb2e5b-97b4-4813-85e2-e1ec352fb1d5.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 0x42933e8770755ddfcdb4ee46d7980ee38c252898a9637018a3599ddb682ceea7. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/GBEPU1200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f950554f7171cf99494f73b2fd0a1df022887e2ca26462d47c87eb45bec70a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GBEPU1500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7d30664b75708d01aa5fa5999825dff24c50bf373835507bed4922c426d4b0. 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/GBEPU1500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79592fbb9dda5104bcd155392272c8443a8d26bf49a28c30a489f25812ae98e. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:42:14Z), 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/GBEPU1500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88378959f44a1124d334df040d461c93af238ef0c85d58e8f8edfe5bcf491d6b. 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/GBEPU1500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c1aabea1a50f9587d86d2decb3dfaecb0ac2bce2031fb37570ac21db234c98. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/GBEPU1500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f37a474cf503d25b1bb5e077e06ba4e1846d6619254a688c53a5b02ff39460. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBEPU1841108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51aa75cebe64804640f50f26cb6096fe7576279f2db5b0d538b42e4efbf3796c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBEPU1241003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7227c2d1a84bbd12bf077207bda5a4eeff54445796c9b1545ec237a5e8989c6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBEPU1241005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333072461699b048ae18782bf8d94a6ee914a55fb6c81a64594b3496dc6621c1. 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/GBEPU1241006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdcafb851a631702a0e720eb3e4b354a341fad80acef467a7af5bb77b5e2b8e. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/GBEPU1241009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f63ac44fcf0a9d89baf267e01415e9a4a7b7a0c9e757b106f25996a531fb94. 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/GBEPU1241012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97690067da399aeae02a33d59a29a5df5aa6d22b02be48e3f327dc5c420fc258. 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/GBEPU2147101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8140b7e25c2e75dae832e10265da63dddb67a1ddf880ddf667a922afc8c944c. 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/GBEPU2147102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636c6f86a31314205c6abb3e3d48f2ff327552748eacc61001b43cd082045e0c. 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/GBEPU2147103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12c02656b09204fada5279b177b25039576fc1c9056701c4523a505bdb2b2e5. 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/GBEPU2147104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13744c1ebd9edcebf14603245e20e792ac053bcb535346709295884af832fc1e. 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/GBEPU2147105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0913d377630bdfc772fbc72c6eefa74aafaf764de7322af2dd9393544bca79. 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/GBEPU2147108.