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 0x9b5feac95c433addfcfb5c73869d3761a424dccd98df4bbd4b2436830e8353ea. 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/20f0f2b1-e281-46c0-a6eb-3a105afdfb9c.json and https://artists.proofprofile.net/proofs/artist/20f0f2b1-e281-46c0-a6eb-3a105afdfb9c.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 0xa1e389c770216d962071f5bc8be9e3a98e538ea3981dc2d83b0abe7eb1166245. 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/USCGJ1571543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29479adbb7d959aec7bbdb6388025db6fea6626aa1f4ffc7d161a45b8770cf30. 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/USCGJ1571544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1514713d9da374b98ebaeca191e2acee8f5767d927b170ef6d776c9525182e7. 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/USCGJ1571545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a8d060d3560614328d30190ec63f8096ccc24dbc20a1281ddb1fe085721bdd. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/USCGJ1571546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5063e7f10cc5648e1fd6bfd99131710534c2942d43c775c26edc834c4cdab5. 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/USCGJ1571547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e32b6510e9f0ac067c7103f21bc793b37146e828e5b5e0e532093f88e2a62d. 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/USCGJ1571548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e750513915247b4cb6b46030126264286d3b0f48408ad7f9cd2d52af74e295. 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/USCGJ1571549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b65272c61f7c5458bef40a8f631e29a169e99b0d1964991afc5bf5b1678c426. 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/USCGJ1571550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bc7eeed17beb53c33818ca9d6c78bf3534c78ef99504d826d89287eea9c1fe. 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/USCGJ1571551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761d32634564534540d1ab3676e48531a43ceb153d622a6e8f3a69f844e4e5e9. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/USCGJ1571552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994c58a4b7289bd483bd67fb2b6e2adc7454713e1d3cd803023e067ab012ad9d. 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/US5YY1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c59ae3f6d163cb9bd606ca08493eb1bab93e337457ce253a89ba151dd4f82c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/US5YY1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd40c2d97c0bb115414aaf955605a437c0d2eb8f83fc48aba62f31ba0e394836. 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/US5YY1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d8697d6a62db8d634fdcd531b6d8572ba8491e48feae46ad0ddc38ec49e2a7. 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/US5YY1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12bbe9d43a1eca1426395f613539b77eb2cb61dd9c68346df6e8cae0d7a53395. 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/US5YY1400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4a882b68f58bacbb85e99bfe0c4159d9838c469c9691bde971fec7086555f8. 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/US5YY1400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa925064fa4df7d1ea91551e1c9b24e987c9bb5b28d7074a25dd8a9efbf33201a. 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/US5YY1400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143f626e632a72fe5889a0806f0e4b08e688c3daa40ea63fb9768ca0f7593ccc. 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/US5YY1400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f28f74e9b8d1ae2a0449580c5c9067914f1c16ca4189fa33fb1362d401271d8. 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/US5YY1400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec0f3d441da16bfb60ecf83a263018675160c03d79c576cac802920a16b69f2. 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/US5YY1400010.