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 0x0e9950ada7a1e192ec43c1e68b57efafd3242e0fd86da1c9677408cce2591c37. 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/46b79f41-e935-4565-ae3e-54a7b28b4a50.json and https://artists.proofprofile.net/proofs/artist/46b79f41-e935-4565-ae3e-54a7b28b4a50.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 0x4f634ee47fbc0e3e0c3883c04a47fe2fe29023f3cffbb6423b8d61daca0826ba. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QMDA72314800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2499ef370b52520b9f4e7fec393ee49450ae1faf8b8bc24ca0c279d1c84f608. 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/QMDA72314855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6a98b74de8f6363bb525db542da295c8e9e4b08853ff45c29118ba641dcc95. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QMDA72314948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa842c000d6f722a3d923bc81712538fe87ef9e836dfe9cfe75b8f07a07d68e20. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QMDA72314971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcda749fd941723629a39961de6223a5fc656dc36516bcbea6bf4cb67601c2fd. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QMDA72315009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5408709ea37e7bbf2ef7b8df2dbadf6da5ebdd92d668c70a8365c7329513c9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6P42444742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a8d95d617ffc6cb191b196362bdd23c65576aa983e2c4a43c17c74d77fd315. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM6P42307657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2182001b2a10b6b751447668dee2cadbcf3f5f99081fe689007b7ccdf81452b7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2346540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224273ecf2f673840d85f4268020f7e81b8456d431de374bc465afe53e1c10b5. 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/QM4TW2346567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7016db5bbfaa09647439c72de5b75e68d00d7eeb17bc617d202ac6b3ec0e7a32. 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/QM4TW2346561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9ee9038dbdd39cd4ad1d77acf549b2685b66a59753114bb22c919c8acb28d6. 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/QM4TW2346447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df7737f6dff2022b5fb21cb963b3251e3cdc2103091a26663d3a2b2ad513cdf. 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/SE6HN2424570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a070b74c1c472fdc240274b5989eca774fd3c26137ce5b715d0f5cf0fa1197. 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/SE6HN2424577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4cdfe34cedba2b5fccdc53b3504f447954489054dd361d1b04b11cdf3b30d6. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/SE6HN2424580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a92e125d92482e5cc9b34676118f9cdf29e8d3dd9a6656c221ae45084b55db6. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SE6HN2424582.