Kurt Adler (March 1, 1907 – September 21, 1977) was an Austrian and American conductor, chorusmaster, author and pianist. He was best known as the chorus master and lead conductor of the Metropolitan
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 0x588c78d2771ffe8a49c62c7cce01f86632264c1625eb7f5e6b58fc5458edaa0b. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9832e84e-6129-4330-b1ae-15074a496218.json and https://artists.proofprofile.net/proofs/artist/9832e84e-6129-4330-b1ae-15074a496218.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Werther, Act III: "Pourquoi me réveiller?"
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 0xa0d96dc32bf98cab79ed2937c7b491c4d1fe2c6f4359ee1a05d90779b0315b8a. 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/CAY620911300.
L'elisir d'amore, Act II, Scene 8: "Una furtiva lagrima" (Nemorino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f404c0b2733c0088309507d500c1eb8774a67510fca3f0d71632d9efcf2ec44. 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/CAY620911301.
La bohème, Act I, Scene 9: "O Soave Fanciulla" (Rodolfo, Mimi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e20beab8e2e14cd31c333706ed235ce51920b93be5740c1e8af140868a9b726. 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/CAY620911302.
Pagliacci, Act I, Scene 4: "Vesti la guibba" (Canio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8a90a5499f7cc0bf26377f2ba8431f5227eb320dc668ed574e271a453578f0. 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/CAY620911305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a28a89f8ce5cf3a6f1c84ca61bf0d15ea3ade002b35a6fbc1199edbbe4a83ba. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAY620911306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2888629e1ed01cfbfe797079dd99ac475834c9beb1503deaa23463ea5248036. 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/CAY620911309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc320d5fede0ee6fa6210834d1df93abd936cb499c1577f54ef2b36a5f0b90711. 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/CAY620911311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea64e2e26edbafd6a97c4a3c86dccf3fba99dc1b714789d612299651a14d90b9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CAY620911313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c48ac1a6a095e6f7b524673467fd163c7b19171bb7b657ead5d5d5ee9a10899. 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/CAY620911316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa695fe8c68339ed23fbfb5d61088d99d3a22b5e3e482adf0188689da35db8225. 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/CAY620911317.
La bohème, Act I, Scene 6: "Che gelida manina" (Rodolfo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cd49561732635951533768f6275d55bc622dab7456f26e63d9f8072126c1a6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAY620911303.
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
Turandot, Act III, Scene 1: "Nessun dorma" (Calaf)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de91bfd24a89e84c0f8273b912ab2a13ef8af961cf3002bfea2ac8ff066948b. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAY620911304.
Fedora, Act II: "Amor ti vieta" (Comte Loris Ipanov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56f6c6021a1135eb973e329de8179b3c0e665e71da8597a03f33e2588187e27. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAY620911307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa5cbf1c13a6f3cb74d6be87f9543aefd17f40761293a0d4d2c4060ca00dfb1. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CAY620911308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b2f9ff77fe50eaa4b0ad11e25e3dd8c2b11fcb1170911051a3195ceacb762a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CAY620911310.
Tosca, Act I: "Recondita armonia" (Cavaradossi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86421a27ed24e84f98520178098ba103fa34c8f3bdfcea86a546e788153faeb3. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/CAY620911312.
Cantique de Noël "O Holy Night" - Bonus Track
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ad448304c2cc4e0cb4243b0a9521a47b822edc8553f2f65419a6c8105d447d. 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/CAY620911315.