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 0x522bfe1ab450e61bdd213ff81789c02fa09a7356f3320fc2819634e0c1649cbf. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c3f238d-1a2f-439d-b352-e4b8139a2e67.json and https://artists.proofprofile.net/proofs/artist/3c3f238d-1a2f-439d-b352-e4b8139a2e67.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Frank La Rocca: Requiem for the Forgotten & Messe des Malades
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 0xfd8e3ef759e5aac3d4ad0f20a566d43a943087b7c437c731c87788ecef6bc0bd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U2301965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7a209381ef230897ed06e5fc1c8fc5382168b2937360343ddf4721f70a43f3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U2301966.
Requiem for the Forgotten: III. Commemoration "A Hymn for Ukraine"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7ea789ceef0aa3fa894a79be81f71d4f874ccd5164ec89a78abe5424d82ed5. 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/USB8U2301967.
Requiem for the Forgotten: IV. Offertory "I Will Lift Up Mine Eyes"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0572715f4a36c2908d788ba87a1d5cb7e99b6a3d6464ac729feb87ef434dc2b7. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USB8U2301968.
Requiem for the Forgotten: V. Sanctus - VI. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a45aabc9d2785d55ca284a80c23d4234bfe7a33d80d1170989fb69888204f7. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USB8U2301969.
Requiem for the Forgotten: VII. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0167ae18e5c0c5ff5ac5f8733fd838bcf755894210310315416743f7b2444f7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U2301970.
Mass of the Americas: I. El cantico del alba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6328f0d5601062e83cb4dd759664db303ba1ad0441897bf23944b42cceaeef59. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/USB8U2201702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09eedcfd7432510539dcdf5ac9c7c46758594f47dbaa2183a53603351dbd8b61. 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/USB8U2201703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55986364ed066671158b4e588735dd5d41868f26e9860e6b49cc88708404f1f3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U2201704.
Mass of the Americas: V. Sanctus - Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68783fb85931c3ae9fb02c56e1713f2bbf3200b92528253ba998556537a7a4a7. 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/USB8U2201706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa849c075265f0a52a4ec6319a98f5c95018b9952dceff8519c4e3b964dcf1ea. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/USB8U2201707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d03df941bd9eff4524abbf12dcc280f4840d588a4cc7c7404fc5fdcfdcd25c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USB8U2201709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f9ca2c45fdb9e12c3d6520252ccd41046f04efd9195697a040ec99cd02ba01. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USB8U2201710.
Mass of the Americas: X. Alma redemptoris mater
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22ae0a3f05f21fd07b5df197f2a40f317cfb1542e7941a500f0aa97c4d6860b. 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/USB8U2201711.
Mass of the Americas: XI. Ave regina cælorum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec4144dd103a9ac52ee521a29b9eced452cacf3bedd35744d7470d60578ffdf. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USB8U2201712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7c56d191b7e7aab98bfaaf809896931ea0bbf9ba6ee15fb2c3400abc22c81e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U2201713.