right|thumb|Peter Mattei, 2012.Photo: Håkan Flank. Peter Mattei (born 3 June 1965) in Piteå is a Swedish operatic baritone, particularly known for his performances in Mozart's baritone roles. Biogra
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 0x134ed88acc9b85e1ecbca4de8faa4b764826325ad9b43f3bf35b8e0447619a19. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d5b0d30-3892-4095-bd14-f8cea455a2ec.json and https://artists.proofprofile.net/proofs/artist/6d5b0d30-3892-4095-bd14-f8cea455a2ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xd95c8cfaf9c6252e2a79b46c8b36526bc849dcd2a8a41f557bdaf8f1f3d2faa1. 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/SEBAA0700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6444675b114aa6370c3d35441022f998300f66e9fc2243980a328e6e839fda98. 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/SEBAA0700204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a3cd9079f8e0642d964d143366a3db1185ed6bd7f2de66325fe4641d755c53. 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/SEBAA0700206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd354628be2207c263a8fcd6f945c3994413d65a0f8f050d58ee4230ad70dbc52. 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/SEBAA0700208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41cd5ac61eaa7a9852cfcdd8190caef51907083af8176893979e9905c1ee8ad. 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/SEBAA0700210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd954a5a2b083562e04ffdc8dc65ecb63864266c670d001787f9b0c72f3cbac7c. 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/SEBAA0700212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6c71606cde1527b035ecdef283faf699c2910d47b53788472767b5cd7f32ed. 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/SEBAA0700214.
Stenhammar: Songs, Opp. 7, 8, 16, 20, and 26
Winterreise, Op. 89, D. 911: No. 1, Gute Nacht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c9af8d00e90326a6ae036d4a83d43d21395cba94c7e0f98a1efa04e9afb3ab. 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/SEAEA1944010.
Winterreise, Op. 89, D. 911: No. 9, Irrlicht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9029b027b7ef7c8df5a067be031bd4e097cb664a3ed1e3ef5408290c402c142c. 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/SEAEA1944090.
Don Giovanni, K. 527, Act I: Finch'han dal vino, "Champagne Aria"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d7dfc8b984056114f2ac2ff2b5d2e5926d7e5aa50433569a22249e00ef1f06. 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/SEAER1049010.
Don Giovanni, K. 527, Act II: Aria. Meta di voi qua vadano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192158bf16149c0d369f4afa598a52ac502383fcdf241695735713decf912027. 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/SEAER1049020.
Eugene Onegin, Op. 24, TH 5, Eugene Onegin, Op. 24, Act II: Uzhel ya zasluzhil ot vas nasmyeshku etu?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14ddd9edce911af5e3ab01221b35082d8a4425f43958f0d7d20d3d5cdbfdb69. 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/SEAER1049030.
Faust, CG 4, Faust, Act I: Cavatina. Avant de quitter ces lieux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0a7d44585d839042d2f03e5424d6edf95c2792beca26f47b1bd5e3d09c91b7. 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/SEAER1049050.
Le nozze di Figaro, K. 492, Act I: Se vuol ballare
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d55dca1dbc79ff51f1259230d016d3a911053c458f0ec5365784480c7a914d. 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/SEAER1049060.
Le nozze di Figaro, K. 492, Act III: Recitative and Aria. Hai gia vinta la causa! Cosa sento!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1fc39bf248a40183d244f42759a755247bb0bee7d518a9af56065ad6599070. 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/SEAER1049070.
The Queen of Spades (Pique Dame), Op. 68, the Queen of Spades, Op. 68, Act II: Ya vas liubliu [I Love You]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe122db98a5f15e811149dc3261087e8a29200796f3c5b5eb976b7b83275b65de. 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/SEAER1049090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a23ce6cfd40a15ab9342b1b4c8df9f4fb5ac6531f07abb625498d97a9f8c6f6. 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/SEAER1049110.
Eugene Onegin, Op. 24, TH 5, Eugene Onegin, Op. 24, Act I: Aria. Vi mnye pisali. Net otpiraites - Kogda bi zhizn domashnim krugon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822387c89e553634f2c7e74721d2aa04f2fb4c0944894f23dd1d178c9a55faea. 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/SEAER1049120.
Don Carlo, Act III: Son io, mio Carlo - Per me giunto e il di supremo - O Carlo, ascolta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590e403d76ca68c1d810334da77fe87569ddd8eb269e24a8b056135fb5c95b83. 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/SEAER1049130.
Don Giovanni, K. 527, Act II: Canzonetta. Deh, vieni alla finestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ebea37ae14c44600b3808650acafbadb650e338da6e67b98be44af7458c8ed6. 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/SEAER1049150.
Fidelio, Op. 72 (Ed. Lühning & Didion), Act II: Finale. Heil sei dem Tag… Des besten Königs Wink und Wille... Wer ein holdes Weib errungen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8276f8bf7763b1d7f99293b7962d71af5f9c5e9a564e822cbb60057c927a9a9. 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/GBBBA1045730.
Tannhäuser, WWV 70, Act III: "Wie Todesahnung... O, du mein holder Abendstern"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a65b4b43b458a4c92070dc2c07c90219292196d5e11a7e632587225269e92e. 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/SEAER1049080.
Tannhäuser, Tannhauser, Act II: Blick ich umher in diesem edlen Kreise
The 50 Most Essential Wagner Masterpieces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ac3da87856803b26182bc4f3dd8dbd31addb8ebf7261211540c78c8ac7aceb. 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/SEAER1049040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b9a4da517d3da3111214a3e6a81ac95fa75001d414d895fd0616c9a4d8d0c7. 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/SEWDL9744321.