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 0x7f77427999c2ee704297d5d595f844f9fec9a97939a75418a55927f4f2dc88c3. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6c79ab87-62ac-495c-a26f-92ed8f5df7c0.json and https://artists.proofprofile.net/proofs/artist/6c79ab87-62ac-495c-a26f-92ed8f5df7c0.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 0xa782979cd8cd344452e53a5b89b73c0cf3a5c8e9359fcf0964cefc99e079d191. 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/GXD7V2501621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26bb10ab3eb7919188a9be35baf47994db1404e1eb061a46d0eb455eca04f74. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GXD7V2529866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb337764e0191924dada017f3f92eaefa78036dcbd6c470f21fc3b516c76b710a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GXD7V2562919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6125f1d87a3ffcf5845eed9f0e28e6533db917c97f103d878fdbf51c9a74947f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GXD7V2562877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7dd9a606c46548499ce34dab603f0e01e732860a5fe5b1ea469c3b3fdeebc35. 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/GXD7V2564197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890ba21370d1bc15a934eb18521ee8ce9296bad7201fbaa02c55c7932ad836b8. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/GXD7G2522963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cbba74e4691ab0010e77221ff294bf91252dc86a848a8486e78b4875e56b21. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GXD7G2558488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a199546e7c7000b0c3be11b204b980dfbfc13409125d776042c23196903644. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/GXD7G2581483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69bf33eb28a7d240092eb691a122f2add3e8f438fac03e60373a85070a77e874. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/CAENV2522311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8629c97691854345343be80bb4ed76825967ec8b09624ca291daf596878fdc4. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CAENV2544197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c04fd5c9c29bf32ae4d11ceb7856e9afd53ab0ce4e5ebf008efeaf6afb358b. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/CAENV2546836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d64f846888b6f614e7e14eb1ddf5bf072776c7cea8ccfd6c3c0f7c3aaa8f4ef. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/CAENV2554777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385a7c5b43d3e429d13fa284328e012b5a2dacd47f4b6a5062bcc2cd15033f04. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/CAENV2562684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdb4e7665f0c9058c6a251d59343eb0200ddec130d8157929e93c36a525fe43. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/CAGOO2503967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb660cb2166bdbbf83605986636f26b67a54ad6c67e5367addb57ae33dfce36d4. 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/QT5M22586817.