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 0x03bbd16996dcc7c72dff63640b636251e0183cb5b6539abb306cca3fa500e6e3. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f71b4a3f-69ff-4409-9db6-95b395523acd.json and https://artists.proofprofile.net/proofs/artist/f71b4a3f-69ff-4409-9db6-95b395523acd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Violin Sonatas No. 6 & 9 'Kreutzer'
Violin Sonata No. 9 in A Major, Op. 47, ‘Kreutzer’: I. Adagio sostenuto
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 0x6c2c40c7c9782eb39db58260cc6d109ffc6c1cf5d5d34941ca5167139e144363. 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/GBPCP1700346.
Violin Sonata No. 9 in A Major, Op. 47, ‘Kreutzer’: III. Finale - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13ccfac12e2e34f89a448e30f390c2cf6a10fb2ccaded2798f4009e1d4aab46. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBPCP1700348.
Violin Sonata No. 9 in A Major, Op. 47, ‘Kreutzer’: II. Andante con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68112bd03f8efab131c46698b7e4508d594d42bc614e00df49362e0a0f5c2551. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBPCP1700347.
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
Violin Sonata No. 6 in A Major, Op. 30/1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb675af074750c7a493f5040d14490bc52dfb6f6b25377c8576aa58bd0573bb3f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBPCP1700349.
Violin Sonata No. 6 in A Major, Op. 30/1: II. Adagio molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2817b5a69ff40d06d4e4e4d8239c970c02973e3ef3d5a2f2ab3ce43cdcad64. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBPCP1700350.
Elgar: Symphony No. 2, Carissima, Mina, Chanson de Matin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe801d7d555bda4521801e72f50a5fa127f2d12ac2240fcdc591a3420aabeee37. 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/GBPCP1700344.
Chanson de Nuit and Chanson de Matin, Op. 15: II. Chanson de Matin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf860fb90daf47835843e7c0d2183c42e77841ff14d1eb7bc277c64b42f002613. 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/GBPCP1700345.
Symphony No. 2 in E-Flat Major, Op. 63: I. Allegro vivace e nobilmente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61923dba1d84d7f9a6071605db0d28905ac482ec191232336e91808e218bbb0c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBPCP1700339.
Symphony No. 2 in E-Flat Major, Op. 63: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6228af3129cd8fbdc467877d27e9d079dcb28b911a82a163aa1fa04a759c83f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP1700340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3881ec55301c440bd2da8f20a080c09532078ee61627a145ddf21e14a5be55. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBPCP1700343.