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 0xfa5339d5e1a5fe54731bc2e2d88b7202a8223796bda08d74e2a3196d7f3183c6. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1deb12a3-c226-4485-8137-290cde9079e4.json and https://artists.proofprofile.net/proofs/artist/1deb12a3-c226-4485-8137-290cde9079e4.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 0xa4f809574cf86ef35e51d31c9c80e44b9404ba354d6bbc022f381bb7cf28241b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/TCAEO1954031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5c253570bca884198198cd1bfaea859ce96717303ac3710128d52212185ff2. 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/TCAEO1954035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446b6c60dbb8db0c32725571cbac7b054f85105c0eb045aaacd41a10355cabe3. 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/TCAEO1954049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ad6cfbae3090ae35e11086dfdd2714b904e940739866d4344c0077a1d91169. 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/TCAEO1954082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dce80939553e8f5e15727493eaebbcf707693ff19205217763cfe53c334c506. 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/QZ4JJ1926481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d639f1a078e8a7f8d983e7c12904194cf51f37479d773b003519e30db63cd22. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZDA81936087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444d723c60593cf3084e94715bcba9105f5e8cb26a26d8dbdad132751aadd76e. 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/QZNWT2300259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c7afbc0c4f6d9d780bcb92141d535534b4417d5ef9e858dd00748f6efe2798. 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/QZTAW2411202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9f32fb4f74d7fe54478ec1d03ec9b040c61d9b5f5362c90b41ffb1dc5691ae. 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/QZTAW2411203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33fa28f0a08fbaa07b0670450184510c8bc303b306027adca284709007b6961. 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/QZTAW2411204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47df6129f6febffd8fa935b48243fb7ca5e6269c22e41b6c1b8eecba518a55f5. 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/QZTAW2411205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f687011576bf38ed3f0c45eef8cf95507d7e761bc2776ebe9b2a06c3f5291f6. 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/QZTAW2411206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0a72a7832621da8532c7f3a0ec5948cd91c2eaccd8e2c18d245bf407c44e8c. 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/QZTAW2411207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10eceb4cfa4b6a581ef7b8384432ad5765dfa2456f5bc9ce9000a570429e708. 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/QZTAW2411208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edc0b626858a1e7696a715e867da5c449ba4096808cb13b7c462fbd0e49e6be. 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/QZTAW2411209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1dda1a4f4d29f8d2bba01e1716f1489392d97735550c31316b4cae998f99d7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTAW2411210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ad7528a426f333381c0e2d82c158a44f0a8b98fe73df3a4b5efd98ee7a458a. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/QZTAW2411211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2182d35c4ec81de4a742d64979d78f22610cfea19204e4696f0b94e30f3b001d. 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/QZTAW2411212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f4fc99597eb06e0bc315edcef9e46f3078a1780e7bf3d4cf76cdfe58be54b9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEQ121749893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b695fbb7ee85ea043b1d1ae8cc1bc40a0c40e12dd44c2aeece0120706b05e4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEQ121749891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d457452a90c2f7d67dd6f9370d5e63101ab4b8f34d074c509e2f721cb1c5739. 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/DEQ121749898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b041c499dc51d46100be718ac55f6d96677e7e859262de40ac4775cea92c63. 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/SE5751895953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd163aac09f1edf44f5314dbeef1cf82704017a8a0862e2953a8842ed09bccc. 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/SE5751895954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1cd33874a2fb43f4e4537d7de7b7f80267a687f35fda7f90e7cc29d115a5ee. Chain 2 (Bitcoin): anchored in block 957227 (2026-07-08T21:49:37Z), 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/QM24S1900941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d251965218d76c95d0ac5514f48ff62fb380517a209461fbd02a9fd33b983ea. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZFZ72256462.