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 0x12e52d68cf9da61900e4ca725a6061f2f36f874023fca7756c11a45a37c05dc0. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6aa16edb-adff-4b1f-b0af-af65585f41a6.json and https://artists.proofprofile.net/proofs/artist/6aa16edb-adff-4b1f-b0af-af65585f41a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mass in C Major, Hob. XXII:9 "Paukenmesse": I. Kyrie
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 0x11d6fa7b84e98c13ee3b098000cf2679f0729ee9e4b4503efa13457a96b76d44. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USSM19504359.
Mass in C Major, Hob. XXII:9 "Paukenmesse": II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34c44c77e0cc39971b87f8820181044ea3a6b68e718cbf96fccb6f491342575. 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/USSM19504360.
Mass in C Major, Hob. XXII:9 "Paukenmesse": III. Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdef8a85533a21f20bff1d701b6a7cbcd841bb9ab1b8a0b1e9f55780d119393a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USSM19504361.
Mass in C Major, Hob. XXII:9 "Paukenmesse": IV. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588411b1c5d936a8598044c6f93eaec86dd2dd5d067d456c79a995434827c8f1. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USSM19504362.
Mass in C Major, Hob. XXII:9 "Paukenmesse": V. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f2e791ab8e23fc9c83a25ce698e6d24bd5e28e3bdbe8f7869b485d6a537ecf. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USSM19504363.