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 0x15b880f5b4ce2726361c11e60fac6fbfb179da2c8845aee4a0dc9b250bbca8d6. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef4c1c5e-a2d0-408c-9bc9-2120fcef6f14.json and https://artists.proofprofile.net/proofs/artist/ef4c1c5e-a2d0-408c-9bc9-2120fcef6f14.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Uncovered, Vol. 1: Samuel Coleridge-Taylor
Piano Quintet in G Minor, Op. 1: I. Allegro con moto
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 0x3b410082e76782107dcbd44d8e282da7c1df75b4f9a3a762fb44dd682f0e3952. 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/USSF61800231.
Clarinet Quintet in F-Sharp Minor, Op. 10: I. Allegro energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f19dec3cf64fe6a5380f78f0e5ae878190b481c6f0911b447c426beabb57f76. 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/USSF61800240.
5 Fantasiestücke for String Quartet, Op. 5: No. 3, Humoresque
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984157b1f9733d8947421cd59c15a202a677c27f85d9315d0749cfd101d32ea0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSF61800237.
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
Clarinet Quintet in F-Sharp Minor, Op. 10: II. Larghetto affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ec96b2e61fee5a346564670b0f6ee48d49989eb6f35ed3ef69a8d7a2a341fd. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/USSF61800241.
Clarinet Quintet in F-Sharp Minor, Op. 10: III. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9cdb97f63f8b083e502548d2dfb4969d3bca0419b4cd7f15f738c8efeaeea3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USSF61800242.
Clarinet Quintet in F-Sharp Minor, Op. 10: IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6f576ff247636fda8128da010f7144a4128492dc78ade1a33c11deb6f8510d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USSF61800243.
Uncovered, Vol. 3: Coleridge-Taylor Perkinson, William Grant Still & George Walker
String Quartet No. 1 "Calvary": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595d7613f7cfa61227fc9eb3a63e9d6083d423232b1a468e75d429aeae1d4d76. 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/USSF61800496.
String Quartet No. 1 "Calvary": III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656d8cc3f2d19a4f6c305306d650e6320d0c237cdde5ceaafbbf3fddaf9111b9. 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/USSF61800497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cd46fb8847bc0eb89e16778b413646b490225ae0def7b9ad8cf9f796cb6c83. 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/USSF61800499.
String Quartet No. 1 "Lyric": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c7c69e545f63f3689d14208d79cba8dcc4285593a353d898f1b07db41a1d74. 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/USSF61800501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04552b1dbd167777e111790e34e3f986e59f425fd579d8c3e091bf6b11d08694. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USSF61800498.
String Quartet No. 1 "Calvary": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012d33f965b5c0e4768a18b767ca6adb519cb497e15b0c76113a7661dd82e1a9. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USSF61800495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327de6b728351ce37c63700d185f0a431cbda59703e93d43c69881cec24c1d89. 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/USSF61800500.
String Quartet No. 1 "Lyric": II. Molto adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fe613016c2fd528f81d661c86e71101ac8a4245e96f41acb432a8de7984b08. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USSF61800502.
String Quartet No. 1 "Lyric": III. Allegro con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f4d6296e6e6275498ede99388dfa0d3cf6e52eaff6e6c52d1217bfb6a123b5. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USSF61800503.
String Quartet No. 2 in A Minor: III. Juba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be111968e8e41750dd79b216a5997afbcd9e231ed8e41238f28918c716e7703. 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/USSF61800350.
String Quartet in G Major (Unfinished): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39f13fbfd59d5dfccdb6a5db77a26fd99faf82c4a48300a14647d05916cfb50. 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/USSF61800357.
Piano Quintet in A Minor: I. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad0fe1f9edcc1cd2321b9a1b17de3f4bb347aefd31885c2c0c9f40a2573c211. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USSF61800340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c18e3426658a41dc13364c6ba33f022d8183f89c4c79e2f3b2f00967b53aa9a. 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/USSF61500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe297066f6b35a83431caae8d9034162af8b5ff98dad2eb1e732848e04eb44b86. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:42:24Z), 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/USSF61500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc7b8db1a93cad7e6cbcd493eccec81a7d1dff200a5d505a4ef7268a2927254. 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/USSF61500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ef7e9be369b4f6699001db74a057141699f9989add02e845fd9c9a427dc51d. 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/USSF61500102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302f4a75aeb578b0e4bc05e61cd8876274a8d5537af6b9e5a27523a94ba38487. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T09:57:19Z), 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/USSF61500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b26775979e785a9776dd167eb8743b52cd7752ca16d6eb0ddf182daaac17c35. 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/USSF61500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec992825510ba65bea4ddfc6206f671bdf5f91141e7c8e83e5cb5f4b549bba5. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USSF61500107.