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 0xf4de1e3a0cd97bca210fd42fa83f1abeeb031d22a6837e60cae9fc50845df652. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8bf7a318-595a-4d27-92b5-ebb2fee20b53.json and https://artists.proofprofile.net/proofs/artist/8bf7a318-595a-4d27-92b5-ebb2fee20b53.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 0x010366b022b3093330674b00a9b3a0e5ba4a3292c25d95bb18219dae5d5c238e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKI192125801 — a six-check JSON result.
3 Visions: No. 2, Summerland (Version for Violin & Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fd59a891e40f97ce275ad9da918e3514308f40067e7639d25bd3395bc7ad12. 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/HKI192125802 — a six-check JSON result.
Quit Dat Fool'nish (Arr. D.P. Perna for Violin & Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7c82b33518b37ee46707232025ad686d29864ff993ec8791daa8cd1abb905a. 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/HKI192125803 — a six-check JSON result.
Pastorela (Version for Violin & Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402821ff56e510935839db250ea99f70e510e93613967d58fe7ece65b47f328b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192125804 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9dae04d1b3ed9e56057ae8849e5608c68799d743b92d91dc0507b5b41a6b87. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192125805 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3d3bdfbe96f699772bbf80b6b23bd17ee7456534ebe0165dafb8fbbc488177. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192125806 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94fa81fe8baf1ba0c45ac2c9ca29060d8dcc260a5a9669be6e98d17bfebd4bb. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKI192125807 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6b4d7b6d117f82876fdbde9a83e4b176b7f5ff368abf1dd92a361394ad16b9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192125808 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c41fbf60751e06f2dd3ae102754ef35331aec836b0ab772630b075814e26304. 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/HKI192125809 — a six-check JSON result.
Violin Suite (Arr. for Violin & Orchestra): I. African Dancer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e25d508cb7194286f407936a31e86091f0e4c387b391d2570a96c5cc5607cea. 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/HKI192125810 — a six-check JSON result.
Violin Suite (Arr. for Violin & Orchestra): II. Mother and Child
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fa948ebb9f6ee18abfe7e76845124957b05e99822d97d4e0a5204b46ed6dfd. 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/HKI192125811 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffc63984e02c5a040798ebe5c0e2e6309035d9f81f0e742d35f366a1136ff50. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192125813 — a six-check JSON result.
Bach: Violin Concerto No. 1 In a Minor, Bwv 1041. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2df3c4d65da594aef1748546e8d9c4ba9f3ebd11c48cc945467836fc620552. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561044705 — a six-check JSON result.
Bach: Violin Concerto No. 1 In a Minor, Bwv 1041. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51ff21ef162259e6c59b9c5e3767fff316d71b0dc70a1c529fe7dd55d07bc80. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561044706 — a six-check JSON result.
Bach: Violin Concerto No. 1 In a Minor, Bwv 1041. Allegro Assi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9104bcf1379f43993811cb7b913c70444d654c872c90ca0b256ee8e1cafe7ad1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561044707 — a six-check JSON result.
Vivaldi: Violin Concerto No. 1 In G Minor, Op. 12, Rv 317. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cabd6578b5aa0bb4f01c3ce1ba9506e135484287c77a2c3c5c31fd131c8398. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561044708 — a six-check JSON result.
Vivaldi: Violin Concerto No. 1 In G Minor, Op. 12, Rv 317. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2713a7b1af3993353c5a43f77fd54f4ac16922d9b45050dcc8de087d1728c02. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561044709 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3f68c205f46d7e9e9acccba68beec3bc422931f4512d5a558e776042f1d30f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561044710 — a six-check JSON result.