George Cehanovsky (14 April 1892 – 25 March 1986) was a Russian, Soviet and American baritone and language coach who had a close association with the Metropolitan Opera in New York City for six decade
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 0xf298c5b01c7853bea296b29dba5c02acdc991697a4e25d6770ab1ab1c59ffa6c. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/157cbdeb-5c4c-4186-b481-a85263879477.json and https://artists.proofprofile.net/proofs/artist/157cbdeb-5c4c-4186-b481-a85263879477.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Leoncavallo: Pagliacci (Bjorling / Angeles) (1953)
Puccini: La bohème & Highlights from Tosca (Live)
Verdi: Rigoletto (Bjorling, Sayao, Warren) (1945)
Verdi: Un ballo in maschera (Recorded 1959)
Parsifal Lauritz Melchior's only surving recording live
Verdi: Otello (Martinelli, Rethberg, Panizza)(1938)
Puccini: Les opéras - La discothèque idéale de Diapason, Vol. 10
Giacomo Puccini : Madame Butterfly (London 1957)
The Best Of Carmen: The Opera Masters Series
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 0x2f286b662004f7354178d8070b0620c9b43651a3d78df68690eeb408a3277024. 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/GBTYZ1002261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75789c319c883c56a312a5ea2437941794dee70087ce45a013857e2fd895a2b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBTYZ1001167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c6fca90b83fc3d27378130ea20c6f61be52040b3c699067e81b1c1b27b8fb8. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBTYZ1001173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c7908c35e2272e4ee3431ca674f4946b1036283dd1ae10031ba8a3cba5b082. 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/GBTYZ1002361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986b4a57b063ed089d009b113a997b20e5fc79e302ce9954ae6ac101e67f13a9. 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/GBTYZ1001796.
Seguidilla: Pres des remparts des Seville
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9952c243a40864801bb67c1df6ce486d06974aa39cfe9965829f20aa76a8d19. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBTYZ1002360.
Chanson bohéme: Les tringles des sistres tintaient
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8712c82ecae966654f08fa4805164471a25840549e7df9ae8be56869e4786b43. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBTYZ1002366.
Toreador Song: Votre toast, je peux vous le rendre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2664a5539b2951285e4ef3dac9159938a5cc7cfdf5b34dc2480706f6dd7c6ac1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBTYZ1002370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7472983be797082106d353ee620054eda44c99f5d041379d9e5b7a02a33342c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GBTYZ1002367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66092219e27d043a565c85d81b61ca2de8961e8f30eadb6c81139e174bc9b0b7. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/GBTYZ1002363.
Flower Song: La fleur que tu m'avais jetee
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda86eb8b1edf4e815438c756b4253dd31e088874df7399412acbd42671d34a27. 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/GBTYZ1001795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08e8c1e82fa2af673c1b62a0fbed129501e4accf20cb660d680f3abdd7eb8d8. 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/GBTYZ1002254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43d1a6e467b568b8e53da9c04dec779a2199deef612a7349a5aea09d5133d23. 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/GBTYZ1002365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad3d1a816069de41d7824085ba253495542e96a753a2fa64e4ebd5c68e02cf2. 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/GBTYZ1002255.
Offenbach: Les Contes d'Hoffmann (Metropolitan Opera)
Verdi: Trovatore (Il) (Bjorling, Milanov, Cellini) (1952)
Lebendige Vergangenheit - Robert Merrill
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ccde35608608a1dbbc1e76a4e674919e557f3e4818bc2e90ebb94a01779f4c. 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/ATP130800610.
Beethoven: Fidelio (Live Recording 1951)
Puccini: La bohème, extraits (Mono Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa267eb5ff957c7d9ee6dce0a46c2a85e5abab98f308afaeccbdb6c74782a396e. 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/USSM11004721.
Famous voices of the past - Giuseppe di Stefano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2d66f7209d2cbc17ae4e3646e313c14a6dd1b7098a9e6f0d40c0277c51ce2c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ATP130343312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9e3d9f84118978a1ac7383a9f2444433b7a4631c8175c74551d2b07051dfa6. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ATP130343313.
Verdi, G.: Traviata (La) (Toscanini) (1946)
Rossini: Il Barbiere di Siviglia (Metropolitan Opera)
Gounod: Roméo et Juliette (Metropolitan Opera)