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 0xde71764ccd25931b8605f0ca9eee3b1fea283f8bd034d5666a5547a95b5785ee. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5676ea10-6427-4419-8b10-146ed2595859.json and https://artists.proofprofile.net/proofs/artist/5676ea10-6427-4419-8b10-146ed2595859.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 0x4314e5768976fb6894fbc18ea8f5669b471f918e0351f652ca0c905aa938151c. 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/PT9HQ1900062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cf83ef9639bcc7440d3154c8bcbd04dc658aff8f83c37333147c94d1a82e91. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/PT9HQ1900063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2799ee1f91e4aaa6e6a5880a0050fed648076fdf18f89b11329e05f83bed5e8. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/PT9HQ1900064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ec9d972972fc0942c48fdba33e26fc505eb9ac3d1ec4415dd43b1c2aad6bfe. 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/PT9HQ1900065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564afa4e7734a7052d61ea0dacc460f05e619a88f994d934a8992c4b947f8afa. 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/PT9HQ1900066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1ee67b656cdb15e58383999c131ca9483d7e41728ffb5d637c4da4ac9baffc. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/PT9HQ1900067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacdbdc021d33bdfd3b0067dea842f4b4131d4a93da9be38728421532c492ec9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PT9HQ1900068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71c8d5a3b0ad133920494a03c2c97d322d70fbe6bcee43f0875d39343b60170. 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/PT9HQ1900069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd8674b19938c4ee6ee0bffc9e10392e91e013840e3f9c9b5678f177a7be8bb. 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/PT9HQ1900070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fd886c1daf126e61561ea3840e331559a7c569116f3c1696cd1b52b9877380. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PT9HQ1900071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69303c3270804f273b4d0ec1091b0620dfcb3343a9c96e505de2dbb147104e1d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PT9HQ1900072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49754e4cdbe51552582879f9b0ff305585102165b912de7cefe9684494f3049. 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/QZTB92547830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67ce550fb3fd61aa9881867acf25aabfd3a8b6402f654b3f07dd325eb7ce1e5. 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/PT1P32400001.