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 0x34a9e5975ea605ff543d3e4324698002ad2008808d3c7434e4601edf4fdac00c. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/839e9527-7f3b-4bf5-a93f-013abc6a41d6.json and https://artists.proofprofile.net/proofs/artist/839e9527-7f3b-4bf5-a93f-013abc6a41d6.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 0x8d27f9163d7f6f1f87cd35966c7292900f8abb41d32280218de24beb14f9c3a7. 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/GBLLT2335154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd499facafbb89dcfdee793cdc3a5d05f43a07a13114e616ad939b7e799af0b91. 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/GBLLT2335155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac5364f197710bc76b73466d3b1a185ce6a804d0407c8fcabd864d44edffdf7. 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/GBLLT2335156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59ffd71426d45050fa032c2e8ccd733ba237ef970081acdfa30d3750a5b37c6. 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/GBLLT2335157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0208497badfdd95314a8dc6fe45de918c4196908ee230dcb6740a4b990e7d126. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/GBLLT2335158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e47727e6c142d9e2430a7872d1203a8ec138d2fc3035d8efff6bfa7f2b736a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBLLT2335159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d949a30ecfe630dd1aa822ac933ecf9a3cbf16c3078de3813ce23335102ac24. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/GBLLT2335160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a7a2976e0f42cab74f713b8227d3ffe527b849c9cef5689ea54238d9388828. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBLLT2335161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec5189754c8465bd84eed2ea9899941db4af521113b8f1b55e2cbfdb49667d6. 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/GBLLT2335163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd3aabcc2e8b29513079081336873d9031083d73d73009e2a01b98b5bc7cbd2. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/GBLLT2335164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfadd5447158ea22a232a1cbf3725cd4ae4fab54177c331e5a22601d2c189ba. 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/GBLLT2335165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa818063d32d93ec06c07b954733ba7711497afb6a4aff902e3c69390e5a95f9. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/GBLLT2335166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82dd3fbaa2c3b32e836c84d66b72f1044f2027e78e917d787daacd6d9e2e39c. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/GBLLT2335167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb16870352133214448795211f8e53c77c3256a57e5c0ced23b24131409756e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBLLT2335168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b31eed33389434e96507d7678500aa906ce2b8c4fb402dfd7b517b192f5380d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBLLT2335169.