Joseph Calleja (born 22 January 1978) is a Maltese operatic tenor. Early life and career Calleja was born in Attard, Malta. He began singing at the age of 16, having been discovered by tenor Brian Ce
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 0xb66c010a29f4f595a4cc22b622c2cda9b2c460d0e83715861273f35fe939a897. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/abbd9e6f-a31a-4428-aa55-bf47d7b10577.json and https://artists.proofprofile.net/proofs/artist/abbd9e6f-a31a-4428-aa55-bf47d7b10577.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bellini: I Capuleti e i Montecchi (Live)
Verdi: Aida, Act 1: "Se quel guerrier io fossi!...Celeste Aida”
Verdi: Il Trovatore, Act 3: "Di quella pira"
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 0xcef10b4f40a32cf960b03de196db703b83b7f6223383c635a2c02c7f0b9ace09. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961800950.
Mary's Theme - From The "Femina Ridens" Soundtrack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa528dcd16421ba774cba73ceace00fddf43101c4314e370b69d79ff6cd6c278a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ITC000702283.
Weekend With Mary - From The "Femina Ridens" Soundtrack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125d60ebcab18359ea1e5950f5821433677b73152f69dc358dca9f1d1eaf5c01. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITC000749285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fee1014d9be6ae7ec2d506aa537e6ca211b0e8cf2375c9c0db7d06f2cee8971. 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/GBBBA5860070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047a38a30643d6c351ae0a301b7a3daf729d5880183fb04e43d499b62f344605. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF076720610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec33063d429f31491975be2560b826335f799a5585f508164d6ef523e629fd8c. 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/GBUM70703215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a15edaedd74d03be36f644c17649b2720a5ccd803b7df1011281408e80d53e. 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/GBBBC2000118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdca6050548a7934ddb773a576eff1a372981b58e30953ef4450decc5d20a398. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBBBC2000087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaffd66e76fae3ff977f9a66e00221c772d3646dcf3e6da33bede502a48f49112. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBBBC2000092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3ec848260aa668c01d03f28343df99b2f977ee5ec282e7c41c772a1914ac37. 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/GBF077321080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a32c4bd8431e0dab831e744bb56081c37e91c92bb711534b4ee7cc6c0ae0405. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEUM70807337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc98b0cf7588273041afd458df980eecf094af3d96549fac0d7748587c742cfc. 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/GBF077240108.
The Classical Voice: A Celebration of the Classical Voice
Orchestra del Maggio Musicale Fiorentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1e598850500282a0c062805ccde58285d29aa8a9a65d5014f4059d8e4f0843. 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/ITZ049700281.
Les pêcheurs de perles, WD 13: C'était le soir - Au fond du temple Saint
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d53b9e5e43cfa9d5a150a31695aa6276852c9ccfdfd682f7ced0a012155846. 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/DEN960330504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cc900e227ee27076b98d0d1d3159a83d57d7b097db4de038c8a7d5bddb1599. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRUM70801154.
Orchestra dell'Accademia Nazionale di Santa Cecilia
Coro dell'Accademia Nazionale Di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90372f3c197f786e5468e6171dca47f4563207702c4b32cab81793e5296c6891. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ITZ049900500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a72c6fd3d9832c6b3489a7cba188c0c9b0d1d5b80449478419ff5c9e84c278. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITZ049900496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa280d9b8aa464d29776ecfca6b511bdb76cecb20ba2ab09ad82c592373e2de4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRUM70801153.
Ave Maria: arr. from Bach's Prelude No.1 BWV 846: Ave Maria, CG 89a
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2b782277d99e0e127066d20a75b5150509fa1f3372acd1ac08a327c98d7a7a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ITZ049900498.
Rusalka, Op. 114, Act I: O Silver Moon [Rusalka]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe127bea78c4c3c7c31861aceddc426869936d65a348b9930145301d449b84e79. 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/GBBBA9650170.
Anna Netrebko - Live at the Metropolitan Opera
I Puritani / Act II: Qui la voce sua soave - Live At Metropolitan Opera House, New York / 2011
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be135be002fb8866cfdf001ac3b25c573668fba06cf9fb706123d479e9345fe. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEUM71102722.
Rigoletto / Act 1: "Gualtier Maldè...Caro nome"
Chorus of the Royal Opera House, Covent Garden
Orchestra of the Royal Opera House, Covent Garden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b70d8b157fcf141c8015b9bc1dffb56a169b779b540fe860ca124c60530362. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBF076040216.
Orchestra Sinfonica di Milano Giuseppe Verdi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a639131886f47280e1c9a61849f43b844358d8ce604704425cfe78dd82a922. 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/GBBBA0341000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a84db3761ad6a1f5b4383b698efa27b474a604ad91b6f8cad41ba83d7e5ebf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBBBA0341010.
Méditation - The Beautiful Music Of Massenet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3f88d9d5585b230f206e05088555afa26d085fe51eebea0a37524535db85a4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBF078310270.
Schubert: Ave Maria, D. 839 (Arr. Gamley and Hazell for Tenor and Orchestra)
Massenet: Ave Maria (After Méditation from Thaïs) [Arr. Hazell for Tenor, Violin and Orchestra]
Mascagni: Ave Maria (After Intermezzo from Cavalleria Rusticana) [Arr. Mercurio for Tenor and Orchestra]
Traditional: Ninni La Tibkix Iżjed (Arr. Belli for Tenor and Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e0dbd906884907a37a520d0609b4d33c98cc44ec8dad663caeed8f8c85a052. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBBBA1044610.
The Golden Voice (Special edition with bonus track)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e39814ac727accc7a2136734f17437df4c52fdfe0598733c819909deda6674. 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/GBBBC2000070.
Con Tutto L'Amore Che Posso (with Laura Pausini & Stefano Di Battista) - Q.P.G.A. vrs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35703a43b7e2ffa242bb9622b8ae2c4ff5348135ed0d4a9db0e64c4d755e2be. 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/ITF780900025.
Quanto ti voglio (with Noemi & Gianluca Grignani) - Q.P.G.A. vrs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad229525d56232809b3277381be7ed2123d15a1f1fcf0519776417e175d7284. 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/ITF780900055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20775e969221ac3051e87d17aba001013a9c2c0121bb6e4c5c9b68c56ad6993. 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/MTA411300002.