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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174858b4480a5485399d251d3c65e2e8776dc7cc6ba7c52abf9b8bf92e94d929. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e2cc2ec-e02e-4bbc-baf8-255dd0a03f76.json and https://artists.proofprofile.net/proofs/artist/4e2cc2ec-e02e-4bbc-baf8-255dd0a03f76.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem in D Minor, K. 626: III. Sequenz, 2. Tuba mirum (Soprano, Alto, Tenor, Bass)
Mozart: Requiem - J. C. Bach: Introitus & Kyrie der Totenmesse
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814edf37196de01271d275b957df614d774582ebf7ce7eb3d846c57f167c22d5. 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/NLA460710578.
Requiem in D Minor, K. 626: IV. Offertorium, No. 1, Domine Jesu (Chorus, Soprano, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28ead8a00ae68dad268215fdd9f3e46b5f2663cdd76d1badc8c0f6c58d2040f. 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/NLA460710583.
Requiem in D Minor, K. 626: I. Introitus. Requiem aeternam (Chorus, Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e7863e098bcc7e302b3a808ddd87f95207c0bda7d973021a795ea2da5a7091. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLA460710575.
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
Requiem in D Minor, K. 626: III. Sequenz, 4. Recordare (Soprano, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a3c244c071804daaacf4bf780ff05aa06f92d373b4d8ce0faab5097cea6c08. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/NLA460710580.
Requiem in D Minor, K. 626: VI. Benedictus (Chorus, Soprano, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01fa92051fc0ad1cf16943307b5339887057dce7af271b2d5a0bf616834ad90. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460710586.
Requiem in D Minor, K. 626: VIII. Communio. Lux aeterna (Chorus, Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92be3a86daa9ee1457db0dd146b2b1b550e86a754ed036fd3d647167d5922ee. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLA460710588.
L'Orfeo, SV 318, Atto I: Vieni, Imeneo (Coro di Ninfe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f96372cf0ea619b5a2806d67ffbbc2387627df1cd45adb5710492e30351fbb. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRZ149501060.