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 0xe7403b6c8b20f4e709411f32457cd6871ffd6788251460045e2d3427f6e8e836. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/57a261c0-687e-47e9-925d-8d0af0eac026.json and https://artists.proofprofile.net/proofs/artist/57a261c0-687e-47e9-925d-8d0af0eac026.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 0xf06a9d71485821950c640fd460029c19e8ba349dba65abd44262020f8f7fd36b. 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/QZANL1757058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02884082118ee6d66b3f3e5b0892f86a8c70d1d2916ac28562462f46252a909d. 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/QZANL1757059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b4e39af43aa0de98bd020635ec142826ec7f33d317e0f079607cfca57329d3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZANL1757060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300ac29db7b0aa1b3a06e86c14cf16c506b3c5165ab79413dc64ef28f9129a4f. 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/QZANL1757061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fab00e5c440e42d3a45d1ae581619e1ffb0f9b8dcc53edf4db47a15b5aeeb8. 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/QZANL1757062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894750777af39dffcb0d04f0c440dfacdef2202d97cb1d20c459c8b26b87de3e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZANL1757063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02f30d7a7bed12c3ac1f4ae3f664e60851dcd0d271d0c20b4f27e49cc29d331. 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/QZANL1757064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703c69e80376f79235d9db87ebb3b69781c26d34f00521d89dadaea931704dd5. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZANL1757065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92879afa730fc4af2d6940ea8855a09409b29deffb26a4bdadf61d4298967d4c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZANL1757066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff3f2f68d76cf1a28ebf599131329b29a84a8248baba8a017cb7a89eb5f9d9f. 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/QZANL1757067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf321b73bb4270436e802ec81f9bd515f8ae0c20ebf7d4a2f51d1fa15d5c52d33. 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/QZANL1757068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd206cb807a56f5f1c1dd67d1fbe4d24dc9b6cbf4601eb4cc1a8bb264b3a2ee83. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZANL1757069.