Ivor Setterfield is a British conductor and countertenor. Setterfield is currently musical director of London's largest choir, Barts Choir, and founder and artistic director of the Trafalgar Sinfonia.
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 0xe45e1cdca8fa4b7f4c6932233dee04b53df41595bfa14f597fecc858ef98913e. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/927b75fd-0c70-437e-9892-6f80449cb35b.json and https://artists.proofprofile.net/proofs/artist/927b75fd-0c70-437e-9892-6f80449cb35b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Classical Music for the Christmas Holiday, Vol. 1
The Nutcracker, Op. 71: Danse de la fee (Dance of the Sugar Plum Fairy)
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 0xb621bb64d2a8ba219e2f6950b867120bfdd619a982db2f1b804d3a8549c85c39. 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/USB8U1613247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329e494fe231e696532bed5f67cad40cfecbfc9e745179dacedd8534d48eb766. 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/GBLLH1543701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309d63d852bc2ffd19d8e79d14334e4852c52e5134fd860d667ddb056a33b8f1. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBLLH1543702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db85a004d6012067e33ec32dfb81e405dec9d24abb048c9158fc0a9b224728d. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/GBLLH1543703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048a6e1d42065767b872640628bc1c32ae1abb32020c9a1cb11d9ce7a1ab9b1a. 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/GBLLH1543704.
Concerto No. 1 in E Major, Op. 8, RV 269, "La primavera": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2d518205fc7237c68aa6cc51e2af37225e52e412dcde5e8ef6a036b6c7ea7f. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBLLH1543705.
Concerto No. 1 in E Major, Op. 8, RV 269, "La primavera": II. Largo e pianissimo sempre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3ea3272317280b1376d7d3491127130d489d067f84f7c8cf2434a96e0410a0. 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/GBLLH1543706.
Concerto No. 2 in G Minor, Op. 8, RV 315, "L'estate": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbb728f40264ba9379ba7e11122b02f00ccf416c4f0b0cb49e1839d3c29e79a. 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/GBLLH1543708.
Concerto No. 2 in G Minor, Op. 8, RV 315, "L'estate": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5ce9d04ad125caeae6a653a2d89a9d09a37c3512bd18f66bab7bb828d9ce89. 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/GBLLH1543710.
Concerto No. 3 in F Major, Op. 8, RV 293, "L'autunno": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de81b89fa14c40b11fa6e72d9fbbdc9ecdbcb815b78bbaf6199137b7c2c36f2. 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/GBLLH1543711.
Concerto No. 3 in F Major, Op. 8, RV 293, "L'autunno": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569a379cf63078a9c8f2c7a6bd080c92cee5a3458bc26f5708dcf273c9ef636a. 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/GBLLH1543713.
Concerto No. 4 in F Minor, Op. 8, RV 297, "L'inverno": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9a2dbf34b5ceea41f1da3cee99b83c734b14912bc917004ece360231dff05c. 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/GBLLH1543714.
Concerto No. 4 in F Minor, Op. 8, RV 297, "L'inverno": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf842c62721a5b9794dc0e8a7d1526109dd72e98d7e80ea62b1794a2faee834d0. 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/GBLLH1543716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d994a5c3c45efdb443e91a7f1015835ac774572bf12eb7fc8f02a06d67da00b. 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/GBLLH1543717.