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 0xf9453a8c84bdfa189b651a087a7d2b119201a2c32d1389ade9d67c8e9ffab369. 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/db1a2211-8fc8-439a-8be2-9955de6483fe.json and https://artists.proofprofile.net/proofs/artist/db1a2211-8fc8-439a-8be2-9955de6483fe.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 0xf158bc6fe8a342de542a50a7078c27d967c8496d0fe2cbac4fac72665a568cce. 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/NOCMC2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7107bac4a14c81564622689b10137607e303a2387a2abf718cb7b24b440bc52a. 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/NOCMC2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba6293d6bf5c86ed8535cc2cf321345fec3d4233ce318097c6780299bcd5916. 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/NOCMC2305010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f5f4bdbb741eadb73b83a38de5a36a69cc9343f3ac12405a89ca4ee338c414. 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/NOCMC2402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251205198a425bc83ead39b4e7bfaf40f9629f1284041a3352e2da4e698cffa2. 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/NOCMC2402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3096f85163fea6ca0a2c908f70730a2794d27687628637ef16017a8eb748a5f. 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/NOCMC2402030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9996cb6de7ed2151273a8fa6ba50717aad54680c0f325c52f144b27a0a9de7. 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/NOCMC2402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7107bac4a14c81564622689b10137607e303a2387a2abf718cb7b24b440bc52a. 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/NOCMC2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba6293d6bf5c86ed8535cc2cf321345fec3d4233ce318097c6780299bcd5916. 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/NOCMC2305010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf158bc6fe8a342de542a50a7078c27d967c8496d0fe2cbac4fac72665a568cce. 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/NOCMC2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c16d4c560fc58f28cd3ec384750c98f2cf6934437ff2e154198fc67a700ffa. 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/NOCMC2406010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7296ec189594374eb66e30cc435e2b2065809cb5f9cb6581c2b2897d6fb6b41a. 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/NOCMC2501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e8b4e6aaf78f1d55399cb045f4b47545c6d547f7ce865d8211c921429f45b2. 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/NOCMC2405010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a4b146ba6568c13e363230088f7bafd62ecc7a1adbf97c836e94f398dbb523. 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/NOCMC2403010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75721858cce3865edc54682ba1110d7aa345d518e21694255dd6f4f7e4f8bd0b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NOPAZ0404010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf793276f0de21c50f054f77b80c87c40e92f9712ae8085444b8a98fb27c791. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NOPAZ0404020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa572f5959710edfe4c5fd5a53dc86ddf49b7158d6ded6f87a3049b93bc4e2e03. 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/NOPAZ0404030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c343d43b7b714bf6f215bad98db31ac646dd91004536b17a5b9fed3d07eac8. 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/NOPAZ0404040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c7497864cca5eb14ca9578cf6edb6b1f9168fb31bd6c17475973d5c51817a3. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/NOPAZ0404050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfaa5f9c497c86d71fb9266928939508d64867a93e27ed1d6ccc647dabe56e2. 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/NOPAZ0404060.