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 0xf53770424f542b1b3944858eba46e93381193154c41c4ac8bf69bb80d281d9d6. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8948f87b-7bd6-453a-97f5-56e4dbbbb899.json and https://artists.proofprofile.net/proofs/artist/8948f87b-7bd6-453a-97f5-56e4dbbbb899.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xfb25b4ffb4bca628726b2304d283c5a3556da50d62fee5b8a4e429040ec4417a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691901 — a six-check JSON result.
Messiah, HWV 56: Part I: Accompagnato: Comfort ye my people (Tenor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4eb2c9aaab78dfa624c3c44625489c7bf8ffbcbd19cbac1e56fae106688817c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691902 — a six-check JSON result.
Messiah, HWV 56: Part I: Aria: Every valley shall be exalted (Tenor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cde062e1511df921b2c336bcbadfab093494e8772ddb78b7c18558e1683853d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691903 — a six-check JSON result.
Messiah, HWV 56: Part I: And the glory of the Lord shall be revealed (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22c6f2014eab29625a8045058ea1cfd039a83ff96e5d4d30eb64a39fe9036f6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691904 — a six-check JSON result.
Messiah, HWV 56: Part I: Aria: But who may abide the day of His coming? (Alto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802d39262a585232828592ce48ebefa2d46224846bd03097cf3fbcee8b809a59. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691906 — a six-check JSON result.
Messiah, HWV 56: Part I: And He shall purify the sons of Levi (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9ceb79050cf0088a8c24cafd14bd83baa4cde7c1430cff81705c743f786d17. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691907 — a six-check JSON result.
Messiah, HWV 56: Part I: Aria: O thou that tellest good tidings to Zion (Alto, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3490dc29b155662220bc8a53bb58e8976c9215749e892480689996248747d3eb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691909 — a six-check JSON result.
Messiah, HWV 56: Part I: Recitative: For behold, darkness shall cover the earth (Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bdbeb0c80e7085d69b1f5d416ae22ae756a63ec174f5387283acd402af5d373. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691910 — a six-check JSON result.
Messiah, HWV 56: Part I: Aria: The people that walked in darkness (Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75ad5a2a105c419c5fe3a4eb092c36fd7ab7eec4d683d6ec70e4156b9d93d7b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691911 — a six-check JSON result.
Messiah, HWV 56: Part I: For unto a child is born (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf971dc16daa25b279a26f6e4aaaf5f3abcb9397c9a5b1739e3d83d59e05a4226. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691912 — a six-check JSON result.
Messiah, HWV 56: Part I: Symphony Pastoral: Pifa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a49ee578b93ed60617af3a59409955cfbca0040c768839c4cd92a46ae475d9. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691913 — a six-check JSON result.
Messiah, HWV 56: Part I: Glory to God in the highest (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663e6fe4e1a1a3ca939ef3ce6bfc384016a31c07e6d1ecd284ded9af06bfe1a8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691917 — a six-check JSON result.
Messiah, HWV 56: Part I: Aria: Rejoice greatly, O daughter of Zion (Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff1fde9f791678d37a5494e750573d62caee2b1b360904441ba4d7302c7204d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US4BV0691918 — a six-check JSON result.