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 0x363b248fb5cb6daee30deecf2edee25eb98f429ac54cd0686667848208f2d020. 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/4d3e38bb-939b-4518-989a-600543e6dc38.json and https://artists.proofprofile.net/proofs/artist/4d3e38bb-939b-4518-989a-600543e6dc38.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 0x3fe6386c98000a7fd7547ef403f66c55bbf50b70553ad6ab7be0d929057b0a95. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZHN92054438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064ae797edf41eaca78b21c585c8331b94f66613a6fc2d1f9aec668986d05d52. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6N2091650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce85a3f089a595d765eb4d7a3158ff352216f5767ecb8fdfab88849794dccc50. 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/QZNWZ2040000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26a632739f90a491471a2049340db5863a34a97354258cc35a0b58cd50693dd. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZHN72149099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdea6c0a6960b9f283cdb74fc4dac19f23d263ac4e11fffb0c1ac38c26e76fa. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTAS2166525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd05889d9f8b2bc20c49e36aa73217efbd1f98487f1f223e13dd3b4676e072e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ42236079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9221a23dd08f3b30c273380d5b4ed3fb6290f1c215c2a0a819c82c5006ead8. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN62210541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0817d8eb3faa87400760ee3f869f278726f8f9ba98bf610c7d6e9f8545f7bb62. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6M2282503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9927e6c3415a03b5d2db74ae829b9537fb92cffdf661f93e7ab6e11c0628e62. 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/QZNWW2282615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dadf1bae87ce30429ba6bcfb55471681e3e9d19d67981a7ba7128dddbcec50e. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZRP52281813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74e5cb9fc28a0cb626ccfa4c6c04fcaf3c2a98e233b6d2b9b8c9e719325caad. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZTBA2220291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda82db96379a1eaf22c7c0afa610f4049613f49e4947a2046efa4f96c174f2d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZK6J2329352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c17c4c365f9e28e5846ed0891e84777603da3eab28a355eeecc46ad58ebf8f1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA62495788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0d69e38df28a444fa1d786b6bf1ac7759fb10dbb36dd3fa7c3ddf0275fb637. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZPEW2401545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40dcdfbed2e849394f0a4c7d3e0921622bcc5086fa23a4cf0b1e12b83432e89c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6K2462249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2c42290490e6fd1fcba9ab54249e80b7bc2c79b79ec8a0c9f05ae48aeb7339. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZWFX2448476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011e4bc846353946e0c2d6b0cec06b5a1017f9488d9cc657640b29e2515eae45. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7X2429486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226849c0511aa3be84261b3bf4bc4d3c03b1e2cc3c5622349a1eaef0e096531c. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZK6K2066412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3787ce93ef231fb7f04542408e20a09bc9018727a8282885d7bf827cb836c2f3. 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/QZVEM2324190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5140913899fde55e10b0c9af99918e3b247bbbb2683904c77d439921d6336a96. 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/QZPLR2299081.