thumb|Bruce Brubaker in 1995 Bruce Brubaker is a musician, artist, concert pianist, and writer from the United States. Concepts Brubaker's work uses and combines Western classical music with postmode
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 0x5b714a53bfdf162608f1648037c9ae920d90b6f9e8500bdbc3b8c2de97e11318. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14e52aa6-4b14-41bd-b84f-0c9da4f0ff04.json and https://artists.proofprofile.net/proofs/artist/14e52aa6-4b14-41bd-b84f-0c9da4f0ff04.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hope Street Tunnel Blues: Music for Piano By Philip Glass and Alvin Curran
Knee Play 4 (from "Einstein on the Beach")
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 0xb77fac4bc787f660c3e8713e07e19f7a7bee6efeea2d9931936bc2d0d1711d7b. 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/USA220710011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8e3b66ac12a7d1f50139552de9231059a32e90d51524cc8f1aaf037d2089de. 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/USA220710012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815d387780be72043b074f2cc340154c56587b9a498d0969cf7ca4178218e2f2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USA220710013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2884d35f473338127612b36b6720524e5e3d28ff159dc9133787239309a31c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA220710014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242aa6ff4b0098fe72ddd5af55e44a5c63f5600021468def27e0a3675dfad9fa. 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/USA220710015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc220e7e135dc84f3112a878e842022b56eb4bae7b79c03e9f9039ffaf0f1320. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USA220710016.
Time Curve: Music for Piano by Philip Glass and William Duckworth
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79463fadbefc9c621f1ffd1f15c09239483d2a4dc2fe65b90fc1c81383258c89. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA220910384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d4759dd3c9751bcd7f90c18c7491b7bd884ba5e3f5c7f5a4a0976cf860add3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEB331237401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d63c11dbd241f1a4aee6c50dc27c73050a71d5314b6fa1b9f3c3dff32e05355. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEB331237402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a8e30ee7dd4e2aaa4eaca57c0e52b4c12059c3c5eecd93c52d253b0c5439bc. 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/DEB331237403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7b114bd538fd163778bf7739d4035cccc5a135020ebfb672ea99f4cd65851f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEB331237404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d2e4719ab19d5f64ca12b068e2f003384e472ec96099c986fdfe67d6a59ed9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEB331237405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed3bd939999bc53ef43054456b7e68be630a2f8b99de140bf8e8504074118c1. 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/DEB331237407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b2e7f04938b997554c513ee6ae9fb4bb3eca1425b4a4015e20d170fa1035e1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEB331237408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a4d4124fcd4555703588ee3a05833b9149382e37f9e962b67c8dab0ac69253. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEB331237410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdea2fd5e2eba15a20bdd45c3ee25d50d078e077243cb529131feb2e1f4766d. 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/DEB331237411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd5d9826d4c7cd99dbb156a579dc0d90f070650f3c39455d00110043d0ed0ae. 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/DEB331237412.