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 0xee7bc58d33c23a6073c1269717e27a4de13eb01d32ffbcdc5d36bc7b0a412ea2. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60d5c0f2-aba3-442b-b2ed-d0141e1e7fce.json and https://artists.proofprofile.net/proofs/artist/60d5c0f2-aba3-442b-b2ed-d0141e1e7fce.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 0xc1ba4f55f41566d99c877af67085c1966707711e756f72b2dc71837f1f0c7d43. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USNFN1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19362f5afe10e29c35aac99481d156d6b61ecc2e830677f4853849736e7139c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USNFN1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821ea5999e2b78532c9d7a14b1550280a541cdb30a81227e51e26d0e0bf33dca. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USNFN1500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5068942423d85fd89038d90fbbb454497d5adcde32ef941b0967b15e595dee6. 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/USNFN1500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd3983b893969081dd4934d507c39e94851c1225b2f7a0df438e06ed8bb29ca. 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/USNFN1500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a281c8f6335a27d14ecd84b1ee4019819aa8b3197d453c047f2cb57b4c1208b. 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/USNFN1500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874e53e0ff0b81cab0a0cb5e42cd8a57ba1cbb46c3df3bf27537c08569de00af. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/USNFN1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abcb79999de782d3dbf3bcd7751429697127c4385d0c731af39bebc7ff0e534. 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/USNFN1500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68c854ddf9b56d4c5255b995b88528cfd12f668986460c23be6d7e8c2446318. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USNFN1500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe2fe5f749ac19220a834b799c51f533c5cda56dceac97d2da456cff4e84d25. 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/USNFN1500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203e146829c0906045bc2afe033325cec08b9dff4a682e5c2e6a98240c118011. 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/USNFN1500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbfb61cbd31ac31c6c32ec1668bf9a2eecc7c1bb22cd9d4b97d94d82388ebbb. 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/USNFN1500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2022b5716580436658dccc0ebffeb2dbeb80a70265cd0af5db52e25433b7f4. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USNFN1500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245da3a846ad7a2be78f7ad78acadd59150b472f043e48b4bd999b7904f23649. 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/USNFN1500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e029c6dd82de02fe0275f3785fc0e0341fad49e3c713f9fbc311747fc322897. 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/USNFN1500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1bd79820f1f0b6b0ebaf97ecef1f717b4446e134b4d2f6d77682a3be92b391. 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/USNFN1500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d0077a76de7d4b3be8a9b635e8caa30019e7f987d7cebea8e90c1ca31b1fd1. 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/USNFN1500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2d4e5bd5fd211dce048fd47d9430264df3bdca6a4fb1d26640455e343e17a0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USNFN1500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb288dccf74fb7d7433b0668fb21f40ddd0666e44c56cb2719fb26fd8acb589ed. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USNFN1500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482c129708bd2c09e567220a3a3d76b57039240e5372535b609c1b2abee58146. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USNFN1500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20c85fa2ac5315c11e76ab2ae63e1022a25604d75829726ac2c345396c03abe. 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/JMA272004745.