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 0xd37ddc45384834cdfe34f6434a0e8d2688a42962cd6a49db93beb95cb1d55d04. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc54505a-fb36-462f-868e-182689a59fe6.json and https://artists.proofprofile.net/proofs/artist/dc54505a-fb36-462f-868e-182689a59fe6.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 0x1176affcd1d81b26065f1afa881b20bdc8dabe098c1c752a7e77b27c8d5b46be. 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/CAJ720858801 — a six-check JSON result.
Dans Paris y'a t'une brune (Arr. by Lisa Ornstein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bc2801a4c0a0fb1b77f860a81a68fa2128d84a818f3b399b4171e3f659d39d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720858802 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8068f6da39da471c118b768d4639c9a8844ef025f6978482eb9eadbae3f1e142. 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/CAJ720858803 — a six-check JSON result.
Valse d'Émile Benoît (Arr. by Seán Dagher)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4935f7731a7819bdf4a90ec5bcf16669ea4a295cf1608b1c188ce1ab9709a8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720858804 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaad0c1f4f22df1173e2f52eb25c0ff6fa7ea95ab454569bed924e2ec10dc3ed. 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/CAJ720858805 — a six-check JSON result.
La traverse miraculeuse (Arr. by Sylvain Bergeron)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2cadc02226f448da4df0261ffc17aeb5c96775f15a127344b2bc9d108cb9c8. 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/CAJ720858806 — a six-check JSON result.
Complainte du coureur des bois (Arr. by Sylvain Bergeron)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd990a636fdb55023280bbe2ac8db6660d5ce985d621a7e9fba590d12043674. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720858807 — a six-check JSON result.
Le navire de Bayonne (Arr. by Sylvain Bergeron)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eda2ca508f580dfb94c247d8d8eb8b6de52c6579842d3ef197915993e4abb97. 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/CAJ720858808 — a six-check JSON result.
Le combat de la Danaé (Arr. by Sylvain Bergeron)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156be45d94d4857df9dff878ea671cda516e81cfae359cb3d34e76985d935202. 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/CAJ720858809 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6411c805c8e931f8a299218430cedfb52e22792aa10c1c7dcf1623ed924b9011. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CAJ720858810 — a six-check JSON result.
Dans les prisons de Nantes (Arr. by Lisa Ornstein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739006ad72d6f6b2257d75471abd6ab72edba7f5f628400b78f6cbb5169e95fa. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720858811 — a six-check JSON result.
Petite Galiote (Arr. by Lisa Ornstein and Sylvain Bergeron)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7930297ccfeb8447e3e5e917bb90aad903fd5c29c6c14ec58d4ee784261a4b7b. 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/CAJ720858812 — a six-check JSON result.
Que Le Yable Les Emporte - Songs From Quebec
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4935f7731a7819bdf4a90ec5bcf16669ea4a295cf1608b1c188ce1ab9709a8. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/CAJ720858804 — a six-check JSON result.
Reel à bouche (Turlutte acadienne) / Dans Paris y’a t’une brune (Arr. by Lisa Ornstein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a9bad62ef5316357a21fdb26296e27e68028219f3b02a9fb486ce030aef856. 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/CAJ721201106 — a six-check JSON result.