thumb|Matti Salminen in 2009 thumb|Matti Salminen singing Finnish tangos in Helsinki; July, 1997 Matti Kalervo Salminen (born 7 July 1945) is a Finnish operatic bass, now retired,He is listed as "reti
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 0x14deec2888eebfe33fe0f8591d96cafb03e74ef38a8f9db2678ad8477447f548. 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/d981c864-11c1-43fa-a8cc-71dde2d9cb1b.json and https://artists.proofprofile.net/proofs/artist/d981c864-11c1-43fa-a8cc-71dde2d9cb1b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Symphony No. 9 in D Minor, Op. 125 "Choral": IV. Presto - Allegro assai
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 0xf9d289c25daee872f97f61b033c22db29b2e2dabfc053db8fee6c328607cf115. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBC18300135 — a six-check JSON result.
Tannhäuser - Paris version / Act III: "Heil ! Heil! Der Gnade Wunder Heil!"
Chorus of the Royal Opera House, Covent Garden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac54b5633eeabeff07f98d28997adb6d35fd790afb16efdccada308c69e4bb81. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058831015 — a six-check JSON result.
Tannhäuser - Paris version / Act 2: "Dich treff ich hier, in dieser Halle"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa556a24fe6b1c7abe22b190ac9eeb5dc3e79155c8d2c71f6facfc53c183837d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058831029 — a six-check JSON result.
Wagner: Tristan und Isolde, Act 2: "Tatest du's wirklich?" (Marke, Tristan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e2da37ba78e28b019de184cf953b374c7bdcfc714750621c0ac9dfbf76eaad. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809428619 — a six-check JSON result.
Tannhäuser - Paris version / Act 1: "Wer ist der dort in brünstigem Gebete?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468b68df838ad6e8db534fc7b53b2c1c31507a4968c853b8b823f4c0d287b7be. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058831027 — a six-check JSON result.
Tannhäuser - Paris version / Act 2: "Gar viel und schön"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef99b9ebdf0aae23de6d26ee1ccf2f4cde6c01102fbacf505ed00851c947917. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058831030 — a six-check JSON result.
Wagner: Tristan und Isolde, Act 3: "Kurwenal! Hör! Ein zweites Schiff" (Hirte, Kurwenal, Steersman, Brangäne, Melot, Marke)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b3b90e335404c5e69a6caa0b7b130f355a2b55e918d1134412db0f6db708ae. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809428630 — a six-check JSON result.
Wagner: Tristan und Isolde, Act 3: "Tot denn alles!" (Marke, Brangäne)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3074fc4f460c0b7b3c2d00879b2563e4a6cd1fcccc7f1a62912dae6c8aff0bee. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809428631 — a six-check JSON result.
Tannhäuser - Paris version / Act 2: "Ha, der Verruchte! Fliehet ihn!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f07dd2855dc2734ee235dd7b23f42518299358208c174ce71f6bcaba912af0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058831035 — a six-check JSON result.
Tannhäuser - Paris version / Act 2: "Ein furchtbares Verbrechen ward begangen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a673fbcb8d2b59d1c11c71fc1d68fcf475695580058b1490837ac957ef83bc. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058831038 — a six-check JSON result.
Das Rheingold, Scene 2: Sanft schloß Schlaf dein Aug'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885e281e3f45fc186451ea757f2f7e67527349070fb12475c4c2a3ab9b97239f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508109610 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cc9554ca02354ed37e58e8bf4c6d23b8eee38442c4cb8ce336d82f8f3c8aa3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508109612 — a six-check JSON result.
Das Rheingold, Scene 2: Immer ist Undank Loges Lohn!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090a488fcdcb8811125c726e8887e23f0c4f5ab4344d1166c5caeb475b875596. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508109613 — a six-check JSON result.