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 0x6148f75e40dd4b51cd1719aa9eed3d827256987b7df0d94187d95c82596794f4. 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/000948f3-c6e0-4da8-8929-26d8ef53eb54.json and https://artists.proofprofile.net/proofs/artist/000948f3-c6e0-4da8-8929-26d8ef53eb54.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 0xe9c95205f861ce3f713754b7151562c54d5512f558187b1cd31763563d188343. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNWQ2245970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eea44b8752f158336df550ba0f7e5cddae823ff78f3a0c6fc05e910f0a98874. 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/QZNWZ2201654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d72938a38e368c362eed9eb36eec6eb4471d2b88844dadc867faaa59aadcb9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAT2241859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1f8729c8a24680a74fd70443a391db3417ffc738c6f6b3b2419ce2d707255e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T16:02:20Z), 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/QZNWU2231876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbb61bd148228867354bd8d6bda7627c47bcedb92f5b55cb63eac151916f7bf. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:20:43Z), 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/QZFZ32332076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8c64665fe0a35f99488818b86725ae7d2b90719437ce98a9e0711c2b668f21. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZNWT2377325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ab9015372eafd1b9052cc2856af0c0440f803e3284009b66257262e5abd6b9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNWT2377326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0daf83110201ff4de86c701c67f69df2304e23bf30d89d279346df0753143b2d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWT2377328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94205fdc587a559003d456ebc25a17a0c5107e94efe610c4d28df03591a82ff3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWT2377332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e292d71ea3f5a4673b514545ace5ae78546d1c15295d88362e4579da6b5dd0. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNWT2377334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87352267e38c6810285d6975d82a67c36b2cbecf0292e31679cda54c9a195d5d. 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/QZWFK2468237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87352267e38c6810285d6975d82a67c36b2cbecf0292e31679cda54c9a195d5d. 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/QZWFK2468237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8a34a48ca69ab7480f37a42604c8cf499e69a5ec8e67927067e22203ce510f. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:36:31Z), 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/QZZ7L2443607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31bfd273b66c283119f0e38144dbdd25864717f32f2ef3ed73a2fcfa6125fd59. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZZ7L2443608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe470bdb01bb18c827d1793c7b57496c480cd8c54ec889535d6dab3d6511c4caa. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZZ7L2443610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72890f3d44778b7722c26bf232122e0f1c60c21f763f97a9dcf670f8b049bac8. 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/QZZ7L2439436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ad4f120f5d09c9733337bf436e787c994c0f2539a66bf9d16a226248156352. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZTBE2490071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0402c1ac0fa50404819cabfb0f5ed4a5dc6a13695481b3f4314bdd9a353e62ac. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZFZ62566841.