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 0xab42c333a41f5faf9033b33840009dae58a029874189b9626bfb1c16dd5df1bd. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3e9aba8-aeeb-4780-929d-753f12d9ced5.json and https://artists.proofprofile.net/proofs/artist/a3e9aba8-aeeb-4780-929d-753f12d9ced5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xdfa2688ef832fa3d7321346e87621f85cdb772474fa521c3d7e9ef58b1a7a706. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBSMU9060473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4650db2a04e5382566c3d55102d3a1bb4fafedd77f1885edc7a743520701345b. 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/GBSMU9060478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65c987d21cdf52c467484fa4ed88e79955a8c04beb58f4a42b40cd941c0e318. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBSMU9060481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12bed1ace76f3cce9f37a1f60782d640daa4d5b924d8dc9329ab60f3e993d71c. 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/GX5MY2127109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ba6f69d4741729d503916245439293d8243b3ef5e32b6a932678158fd2a044. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GX5MY2127110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe85ea732f055cef82be1de2e68c39fa3ab1b0f62ca25201f537edbdcd327bbe. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GX5MY2127111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a0179420f9ff9a7a25a63c6e45d692be97221cf360187007d86532b7953756. 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/GX5MY2127112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff4477015d71fda0f50e1bc1dad5d54532ca2383da41db3f943598e34623cda. 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/GX5MY2127113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb286de8f37c033f91e54b3227db65afebca7e55156001f4b40af95e5e99f05d0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GX5MY2127114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9ee80403dcd2f4cb552fbbe241940720826161e0e0498f06fa4ea571024736. 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/GX5MY2127115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a88324370ca8c89af850c76e030efd2db963a4b66eea6482a535d8a2b157e45. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GX5MY2127116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c00792a4beaa2387ed1356c188b325f4f876d5f07eb821b40703a4b95531587. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GX5MY2127121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609c2dc041665f9847cfdaf9b70e4032a4f3240ac8805362febeb766b66241ee. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GX5MY2127122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7308dd8365562d494ae02f134f56c8f0d003a3208421a50fffdbafcd9709b297. 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/GX5MY2127123.
Lennox Berkeley: Sonatina for Guitar op. 52
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842b25cc9aabceb11b22ebe316366ad4559f8a49bbfe1c0f421184626d6b8b24. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GX8KD2433825.
Ojos brujos (Arr. for Guitar by Leo Brouwer)