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 0xd41114df4f5642bd8b7573baa179fea08d793fdafa117064463dc2a1dc6d769a. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d2a3e95-7297-4a5e-850c-17dfbee4f426.json and https://artists.proofprofile.net/proofs/artist/8d2a3e95-7297-4a5e-850c-17dfbee4f426.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Matthäus-Passion, BWV 244, Pt. 1: No. 7, Da ging hin der Zwölfen (Evangelist, Judas)
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 0x3d469716d89d4ad3dd8c20feb18adf907d77a05a8b7da216b9f949a9d89698f6. 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/NLA460911569.
Matthäus-Passion, BWV 244, Pt. 1: No. 11, Er antwortete und sprach (Evangelist, Jesus, Judas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86955cb9f94256c7ea4e0849692ff460be80538e0690e93646a328d74d71da46. 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/NLA460911573.
Matthäus-Passion, BWV 244, Pt. 1: No. 26, Und er kam und fand sie aber schlafend (Evangelist, Jesus, Judas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1f64a8d044b962a836fd152ac52630e58771e621dd5fd798d5fd56520d5414. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/NLA460911588.
Matthäus-Passion, BWV 244, Pt. 2: No. 12, Des Morgens aber hielten (Evangelist, Judas) - Chorus, Was gehet uns das an? Da siehe du zu! (Chorus 1, Chorus 2) - Recitative, Und er warf die Silbe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b5779d676ea17077329de6f60901fa0e97ff58e25344c58cbfa64e670e9756. 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/NLA460911603.
Bach & Böhm: Music for Weddings and Other Festivities
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e17dbbbacb4035f80c687d12cdebab51dbd29edd88e3648e3898261c6b5d97. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BER181132319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa02f53b6c261461cad6f1f79a5fa9468d5548f2d0b74c983f30e40f53fa1606. 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/FR50X1844416.