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 0x5210143f58528b8b4607105c3404cb5a81921b838bb18e3d5fb2695abdb27809. 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/0016ef3e-78d0-4ae6-bf9a-628a1749dbad.json and https://artists.proofprofile.net/proofs/artist/0016ef3e-78d0-4ae6-bf9a-628a1749dbad.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 0x5f47d1710204cff87071ffc6e2cd794d64a0464ebd45085166e39d3f9516588e. 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/QMDA61588916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4376393035188a64c3d1d21b903fa9e35290120bd9f50b0ee152457d20533f8. 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/QMDA61588917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280ded49f46d946e1c478d236993682d7c2855fe034561b77fdd22315a11781d. 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/QMDA61588918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6e197b0280a7d5a4aaba340ef1bf9126fde2c97bda9b3549fcccc597562bc6. 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/QMDA61588921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c979e329d076c4dfaa617bd0dbc49bfb188d5a68beb222cdd3ecd4662b9cdf7. 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/QMDA61588406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf170c66d4843c4cd4ab9dc8ed46f32300615af95147fdac1e20cbb6e6c238bc2. 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/QMDA61588410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9231c26f33e949235ac0e75e7c522d64e144c6b9bc9634bf026195f161d924. 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/QMDA71529180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e30e35b8e144265097f2668b48d73d15c48da3988778ee92d3b449079c3fc5d. 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/QMDA71529181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ec425b3e377ec7cd22d13e0f720b4978d998a1d0fb347dc353c7c56909633e. 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/QMDA71529182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2851b10783c8fb24486c425ae8ae3e6244f5800dbda08313973d81b4cc8a311a. 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/QMDA71529183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa094d9fd05dd5bd4a9072d29100d528c748b33b7a224050df7c3151945b4ee9f. 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/QMDA71529186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54352e04a4711406e39a7ac37f898b2990581a49ac908d2ab7a148b7273fa18f. 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/QMDA71529191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc214c5cf239787e606633299c4c2d97f843835f08857aeda6a28ef7c56774d. 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/QM6N21465617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe128d7d555270c4df99092219e3240a6cb7588e869f8711635199ecd1f512c18. 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/QM6N21465618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd47fbf1c990e8a742d22c4dd22e3a7e52ad83cdf323c117d70c1cf325f09ab. 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/QM6N21465620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57d75031afe659e3721ad01b9f5fca68a9173d947739dbf3034a028c7ab1c26. 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/QM6N21465623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f1ee9bdd8592d81abd801172dc5d62237ac1803f8991b321d748080c50ae22. 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/QM6N21465624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0ad8966b28d038590d1dc923cd41283b577bfaaf7ceb30ac1b750713561d45. 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/QM6N21465626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ed3d559dee39f018dfeb81259dba2b36f95a33e93d464e2bff4615099907d7. 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/QM6N21465628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6f3c8603ea9e0df4378af59d018df1e4f8e960e4a8a509677ecaa4b020c3b3. 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/QM6N21465638.