Catherine Robbin OC (born in Toronto, September 28, 1950) is a Canadian mezzo-soprano. She was elected an Officer of the Order of Canada in 2011. Born in Toronto, Robbin studied at The Royal Conserva
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 0x9ecf0453f913ac3ccb27088fb928af16eda999fbb7967af10739534279a320ab. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e42c4c8-ac99-44fa-8564-1353c5ea7b62.json and https://artists.proofprofile.net/proofs/artist/3e42c4c8-ac99-44fa-8564-1353c5ea7b62.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Orlando, HWV 31 / Act 3: Vorrei poterti amar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0830dee959578606f43a2da4b17fcfc317b7f1bb8e1c4aaa52e33c5212534094. 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/GBF078942140.
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 0xadfbbf13d29aad01df3bd58fb3ae8ede535c8d8e37395e69de45492ac54c4622. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078942131.
Orlando, HWV 31 / Act 1: Ritornava al suo bel viso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1157d7f17e40c4295b54b3a49aaf2bb14d2982b470b0ce686a151db026ba5bdd. 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/GBF078942113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678d840ce29b45099dc32d29aaa6c0deee9e717e257bd731058ca99c13b44ad4. 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/GBF078942115.
Orlando, HWV 31 / Act 1: Se il cor mai ti dirà
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9456ba4bd55f0e27f1db289e353c94eda311d0a4f7bb1ac6e3e377a1868325. 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/GBF078942116.
Orlando, HWV 31 / Act 1: Se fedel vuoi, ch'io ti creda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4706223b9e0c4f202be56ccb92b9c0372cf869f00f4a210fa2b3bc880cac7df6. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBF078942119.
Orlando, HWV 31 / Act 1: Angelica, deh lascia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2125aaf108e6153d5b32cc84e5cd5f442272b46cea425fb3fbb3cac9e703e7c. 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/GBF078942121.
Orlando, HWV 31 / Act 1: Consolati o bella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1e3b6a6770c88f28ee0a560ef6a1639d2287c1df55a738c5f8410b04afdb18. 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/GBF078942123.
Mozart: Coronation Mass; Vesperae solennes de confessore
Mass in C, K.317 "Coronation": 2. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad120c909554571ead9c2ad96551d82b7a65e5c88a68a824bba301b4373e162. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/GBF079011072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cfe832b425aa3627bbfb570933cde0e308b99063d5ee0a5247de45ffbefe1c. 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/GBF079011074.
Mass in C, K.317 "Coronation": 5. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160bbffe923f87cdfc559910893e7fb39a884174c38508b9f7cc18a1eedd9322. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/GBF079011076.
Mass in C, K.317 "Coronation": 6. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd7b16b09253b4f43fd4027c133cb3446061e1c95c41b430955aa9ae73c786e. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/GBF079011077.
Vesperae solennes de confessore in C, K.339: 2. Confitebor tibi, Domine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c23209370b9b7238fc8c1f5229452d6e8227b7157af8678893c315eca9f20e6. 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/GBF079011082.
Vesperae solennes de confessore in C, K.339: 3. Beatus vir qui timet Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fabd5279c7331f7eb4273465d3d5e86846c88ac57ef86ea3f7652761da2dc24. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/GBF079011083.
Vesperae solennes de confessore in C, K.339: 6. Magnificat anima mea
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2669ac90d83b782e85dc11805fb68a95563bedbce09a7e7d2f8cecf27b12ad07. 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/GBF079011086.
Mozart / Compl. Druce: Requiem in D Minor, K. 626: X. Domine Jesu Christe
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 0x8e83e0388c1ace998333be70ae0c1cb9d9bf186f878bc9318d99a7dc00e87888. 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/GBAYC9100903.
Stabat Mater, Hob. XXa:1: II. O quam tristis et afflicta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146911df50e8d125385b5ad210bd58df9b32a476e83853e18be4fda68b89f623. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/DEF058930402.
Stabat Mater, Hob. XXa:1: IX. Fac me vere tecum flere
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01e431c9c96ca4d9c4c820d2854456308091b8f00625540ab7b03813ad8e14b. 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/DEF058930409.
Stabat Mater, Hob. XXa:1: X. Virgo virginium praeclara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab46b374c15d92631cc210dfe4bf95bc6a9b7db672ef65199d1d5481d5280c06. 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/DEF058930410.
Mozart / Compl. Druce: Requiem in D Minor, K. 626: IV. Tuba mirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7cf90cfd84cd1feb3913a030a70ddcc06e79a4361c39ceac6b1e56a72c0dcb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9100896.
Stabat Mater, Hob. XXa:1: XIIIa. Quando corpus morietur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa376243b162b9c6aa29394600f0a0c712d9958a5923cc691c5c11d1d256d85f3. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEF058930413.