Isabelle Cals (born 1993) is a French operatic soprano and mezzo-soprano who made an international career in opera and concert. Her roles include Bizet's Carmen and Wagner's Kundry. Life and career
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 0x3fa4e920f31997af8b456677f12bb4e30aca91b3c4c332f92ba5804693f79610. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da3305a2-dbf3-46ff-b230-d84e0bebfe72.json and https://artists.proofprofile.net/proofs/artist/da3305a2-dbf3-46ff-b230-d84e0bebfe72.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bizet: Carmen, WD 31, Act 2: Chanson bohème. "Les tringles des sistres tintaient" (Carmen, Frasquita, Mercédès)
Orchestre National Du Capitole De Toulouse
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 0xe2e44f8e70e90a84d38d29fc173c22cd7a0414b0244470917b62b158d997ad22. 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/GBAYC0203235.
Bizet: Carmen, WD 31, Act 2: "Nous avons en tête une affaire" (Le Dancaïre, Frasquita, Mercédès, Le Remendado, Carmen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc830dd8c2076ac0c2df18e8b50907fba90115f772f9c58621ca10d906f5fa7e1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC0203242.
Bizet: Carmen, WD 31, Act 2: "Messieurs Pastia me dit…" (Frasquita, Zuñiga, Carmen, Mercédès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f15044de6788fdbd2d9ee1e633848bbd0a849370f26dbd72dacfd5aca2b9b1. 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/GBAYC0203236.
Bizet: Carmen, WD 31, Act 3: "Mêlons ! Coupons !" (Frasquita, Mercédès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2892fa0c5b699316d5d2089a6974f46aecc0495dbf900793935e46f59da430e0. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBAYC0203265.
Bizet: Carmen, WD 31, Act 3: "La mort… Parlez encore, parlez mes belles" (Carmen, Frasquita, Mercédès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726d8012c5bf32724bbc7bd0cf4023561bb46b4a39e2bb46ff535661c3bd6ae5. 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/GBAYC0203268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e44f8e70e90a84d38d29fc173c22cd7a0414b0244470917b62b158d997ad22. 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/GBAYC0203235.
Bizet: Carmen, WD 31, Act 2: "Votre toast, je peux vous le rendre" - "Toréador en garde !" (Escamillo, Carmen, Frasquita, Mercédès, Moralès, Zuñiga, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4afe90dd7ff94f6f6089097c070973bb1300a9e9eaad6d9d3cf9fab2485609cd. 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/GBAYC0203238.
Bizet: Carmen, WD 31, Act 2: "Vivat ! vivat le Toréro !" (Chœur, Zuñiga, Carmen, Frasquita, Mercédès, Moralès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5415274a71040cd33d5c367cf6320c0810ccce976c58c8ca24f25419c34b52. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/GBAYC0203237.
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
Bizet: Carmen, WD 31, Act 2: "Plus tard !" - "La guerre, c'est la guerre !" (Zuñiga, Le Dancaïre, Le Remendado, Chœur, Carmen, Don José, Frasquita, Mercédès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f39a4292ec7e63a372b40308dd4a3dc5ffa6fe8e17e10e85ea5da13340c4f9. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBAYC0203255.
Bizet: Carmen, WD 31, Act 2: "Halte-là ! Qui va là ?" (Don José, Carmen, Frasquita, Mercédès, Le Dancaïro, Le Remendado)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81322656438e122071771e8bcf0cde5d27033055dcd3a135455f51eed574c5d. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBAYC0203244.
Bizet: Carmen, WD 31, Act 3: "Notre métier est bon" (Carmen, Don José, Frasquita, Mercédès, Le Dancaïre, Le Remendado, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8862e3f278d562588b4fa66be37b6efb5f593617d506a207400ea0ebda2da9ae. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0203260.