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 0x629f256cc1fa46ac68fd75e9422ac573a4d9bfae7172f7304a2131de6cdb8edc. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be984867-32f9-41a4-9903-8983310f32d7.json and https://artists.proofprofile.net/proofs/artist/be984867-32f9-41a4-9903-8983310f32d7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Die tote Stadt, Op. 12, Act I Scene 1: Behutsam! Hier ist alles alt (Live)
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 0x06dd850b5ee24ff911ead42f7792ea0b753e3277cfb8cd87977a425c616a9054. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/GB6CE2200001 — a six-check JSON result.
Die tote Stadt, Op. 12, Act I Scene 5: Wunderbar! Ja, wunderbar! (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1531e8f2e8d58ad8c957de1e34c6b6b99f4a2adbe5376599332169b74b75cefd. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GB6CE2200005 — a six-check JSON result.
Die tote Stadt, Op. 12, Act I Scene 5: Glück, das mir verblieb (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59be84418c8ea4201fb4b4072e7405a0ea112e0802fd6236ec431b047d855bfe. 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/GB6CE2200006 — a six-check JSON result.
Die tote Stadt, Op. 12, Act I Scene 6: Marietta! Paul... Paul… (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d027cce3eb2880f6edf405c9a822bcef60a05b80e9624ee19154187b5a1a37e. 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/GB6CE2200009 — a six-check JSON result.
Die tote Stadt, Op. 12, Act II: Prelude (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bed493217c25ea6f4d2665abbf90a8bad1d133d81b4f8b2cfb43ae06eff2b29. 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/GB6CE2200011 — a six-check JSON result.
Perséphone, Pt. 1: Déesse aux mille noms, puissante Déméter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98e9f586b64bd07bcdf436c71f2a9a9fe2c9276e464ac22e179342c40140656. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421704201 — a six-check JSON result.
Perséphone, Pt. 1: Reste avec nous, princesse Perséphone
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e099a017dbda2594c5081d864c8440fab1629fea25ae127e5a55348e2359bdb. 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/NLE421704202 — a six-check JSON result.
Perséphone, Pt. 1: Perséphone, un peuple t'attend
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd613f7cb73d7d6fd5d43e2928e798294465ea14605ad4564713d30678abafa. 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/NLE421704203 — a six-check JSON result.
Perséphone, Pt. 2: Ô peuple douloureux des ombres, tu m'attires
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a95133288e3888c9632516b4831e715f453bf233803308e633400cefc5370f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLE421704204 — a six-check JSON result.
Perséphone, Pt. 2: Sur ce lit elle repose
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e42054dc37eb5ab2d3c877d2ef24a0970d2e2fe9651ac86a79d6dc06e4ef68. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLE421704205 — a six-check JSON result.
Perséphone, Pt. 2: Ma mère Déméter, que la vie etait belle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978a6bbd2658dc08caf3a148515b379abd09dce12bf6cdc95490039c82a2662e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421704206 — a six-check JSON result.
Perséphone, Pt. 2: Tu viens pour dominer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc07b905e6397f8460a3b36ef0b21d9953bd39dfce12cb77686c2a0eff61abcf. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421704207 — a six-check JSON result.
Perséphone, Pt. 3: Ainsi vers l'ombre souterraine
Finnish National Opera Children's Chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54da6cd996a2559f6cff3bb1db7776db92f99da8b7a6afa92c5ae3bef22c61e0. 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/NLE421704213 — a six-check JSON result.
Det sjungande tradet, Op. 110 (The Singing Tree)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7f57aa865aaef01a60d5ef24c3b4c76f019a3b5fa953fc3e1067e65bc56258. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FINDE1300103 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8407b1109e3e79458404da0ff1da54c6c0159b1c26db22a405e52f35688a104c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FINDE1300107 — a six-check JSON result.
Sibelius, J.: Cantatas / Finlandia (Complete)