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 0xdb123c289dac9211a2d719beb9c6d2a0b5bda61cd7f9fd92a4413ba105f5374d. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e89fc93-4644-41f5-8601-f74238cc7145.json and https://artists.proofprofile.net/proofs/artist/4e89fc93-4644-41f5-8601-f74238cc7145.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Saint-Saens: Messe de Requiem & Partsongs
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 0x5b8ff2cc0819cfc5ec92d8776bb492221fb636643eafd095675249d9b7ac3951. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0408501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785f30b75e8c9e20cbeedc493b40c4bc23606e804a530dbba1f9069b33fa05a2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0408502.
Messe de Requiem, Op. 54: III. Rex tremendae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53a79945d05ca323efa8a215f65c9f66c7638b3cfc2ae4856f5a4ba8c67768a. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/GBLWD0408503.
Messe de Requiem, Op. 54: IV. Oro supplex
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6216979e6a0d6700ecfb43ee59bc5a5d2e976ff40a1edd23a9f35fbf341e3a8c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0408504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2023b6a69325345065b21e8c46186da1311dbb655ce7f413af45c7a4bf91ccc3. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/GBLWD0408505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0ea7c139abbccf7053042fdaaff6726d2dd5222264771565aefe2ff31fd0f2. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBLWD0408506.
Messe de Requiem, Op. 54: VII. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8181ce1c373b7feea371d111f6b686c1f88e9fff2932324032d46ca8d71b42c9. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBLWD0408507.
Messe de Requiem, Op. 54: VIII. Agnus dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1a48c95ace77063357479010408dbf164c3b8058dfda80998a2140eaa72242. 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/GBLWD0408508.
Donizetti: Lucia di Lammermoor, Act 2: "Dov'è Lucia?" (Arturo, Enrico, Chorus, Lucia, Raimondo, Edgardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c372f90f88ce231ca46ac505f0da097d3eda753d857bffc56cbfe219f8e8979. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1402607.