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 0xec57ed51f7e6b1fb8f3560a4be1e97e69ba1e92d2dc18875e17c2f7bdf9b1d02. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a41fa465-b9cc-45cd-8906-d3f85d30f905.json and https://artists.proofprofile.net/proofs/artist/a41fa465-b9cc-45cd-8906-d3f85d30f905.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Haydn: Nelson Mass, Ave Regina & Missa Brevis
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 0xa162a037b0ba4283c721e73a7fd46449a65d831331c2975da16b23e5c53ca254. 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/GBLWD9812801 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe884bc9afd4b0c06edc62f9a4fc78513e0ec1284082bd6627303e54765a7e26a. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9812802 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": II. Gloria. Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6311a81d222d2a33855bf93ad802547a2a4592ae65c0a0b8d25319d13109b598. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBLWD9812803 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": II. Gloria. Qui tollis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ee70f52aaa47ae444b6cfbbde08cb8bf5070c1e4dbee419252dd4e6a9bf8dc. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBLWD9812804 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": II. Gloria. Quoniam tu solus sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856e7c98ac81fdf501aa36d65e81ecc344df60cdba7d8fc3b7e7364e8872aed8. 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/GBLWD9812805 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": III. Credo. Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8756e3dd78811d09e97770f6a468113cd634cb181433600203a3a597889a838. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9812806 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": III. Credo. Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10ea6070253c0abb4ed73c5de58407a3402d4fff406dd0a93203d3e35fbc254. 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/GBLWD9812807 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": III. Credo. Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e0efe0a6e9204cd096b578cca509e10c58ab12993088099dba33dbb55c0cc0. 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/GBLWD9812808 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": IV. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0c6ff80bb315f97c20c66bcd7e83f2843485780e946146446ff7edaa4cb965. 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/GBLWD9812809 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": V. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598e5efeb4e8665db9fecf889c0ee377aa04aa48609173b44c58b41dc514cf0c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9812810 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": VI. Agnus Dei. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda278aeddb2604d2b9d97a6d4b90ff79482363904517cce4d3701fddd13bbe4f. 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/GBLWD9812811 — a six-check JSON result.
Mass in C Major, Hob. XXII:9, "Paukenmesse": VI. Agnus Dei. Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb8f9e7ae23b7e6fc46ce3cd0f3f61ac311dab391362cacd7b5ed961de3e368. 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/GBLWD9812812 — a six-check JSON result.
Alfred, König der Angelsachsen, Hob. XXX:5: Aria des Schutzgeistes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba39d643e1894466eb66634578864925f6fda8438cfd0f08ca058c5a0e30a19. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBLWD9812813 — a six-check JSON result.