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 0x183dea70166699ffc5c2fb64cd5d707eb65dfd8aca51a09fc2ea26c235822ac7. 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/f95fedfa-eb65-419d-9ace-0bd779402072.json and https://artists.proofprofile.net/proofs/artist/f95fedfa-eb65-419d-9ace-0bd779402072.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 0x495e38a5daac004ced3b76c623906612397a01c4ccef5f04e68c5451a78ce2ca. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZNJX2201515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce380a2918f8c1200695b08ce75338133c96a5dcc04b10833acd0da21418a744. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZNJW2576857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b7351e5a7916b5ac47ee9381a756ed4b27fd002de62a9822b4ab5aaa02fcf0. 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/QZHN81926023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f04375f4f5a535407193a6e0750b56046512c785e4c4de5c0d9c0ceeb401131. 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/QZHN81926024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c92b432b332ab5fdf459d45e089c6445eb1ba7e1c5708b39fd06f03d6871fe2. 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/QZHN81926025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdcddf72cc0f914260f94c5568f020bc4bf1af802b4bde1e04f78161f0eeb07. 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/QZHN81926026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16d4cea56f7d3a5fb00f51b2fa093a5bf1d2f6f0f369702b057e4fc4923d331. 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/QZHN81926028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16772e7dc8d4e62b4bbe27ec7451895adcdc1caddcd7f5677f56ebe9fd1435c. 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/QZHN81926031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e50cee910c94dbb3ad699bc42a552581ad4b41fe3c5eb78491e8bc473927804. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZHN81926032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0b5494440c1a99c835b088ade5f6af2b7c6c17de43e30a9ad451a818f31090. 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/QZHN81926037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed63ffabedec858acc9945cf9f484c81da55e8c97c4e8bd461e72c3546d6e25. 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/QZHN81926039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea0d583ec8507e7ff301657cf06178962d867e84e7f9cdfa876464c8d30305d. 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/QZHN81926041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded9133591db9d14ca5b0fc87292c6ca3eaba02a2a14daded3c8e571d9173e5c. 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/QZFYY1979270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250dc8a462af7ae132192365ff7d6719e4504492a3f359f79197d5aba726e9ac. 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/QZTPX2113706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab582534d30022d351fd6bcf5b0a9f290385295eeb0bb8902896dd3f47d8c2a. 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/QZTPX2113707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fbad2bfb03496faab590564ab330174628527aeb21697aedd750705f16bfc8. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZHN72070118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520e834d2b1ea5ab1a43e7fca88f8f63c8e1c3a131bc053734804ef9cf1c6a29. 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/QZHN72070119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8179e3d466d89d0e835c400b304a53461a452dce101858953da9fdc8e53bd7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZHN72070121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e7130071784334652c3f8ebcbd687bdccec3c1e6b9e03d83d50cb5c93356e4. 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/QZHN72070123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a76fc3cb711ac7998adb5de06fa3ec0bf8510061a8f404bd2969b1658ed169. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN72070124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc484691276a8bf589ef024eaa2ee57da2b83d67905be8c88e4ba31a757ac8015. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZHN72070125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a08c2b8d8bec141cb16916e46f7896c9faeca444c153cc76706b0053979a02e. 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/QZHN72070126.