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 0x0086353095eae8bdf29b80d8230ef1bc9bae8b72152e2d3a9b46a1a70f257e93. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd025139-bed6-40ed-8cc4-55a35f36cf27.json and https://artists.proofprofile.net/proofs/artist/cd025139-bed6-40ed-8cc4-55a35f36cf27.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 0x3ff882cfdf25ddc2d8511cf63b833cbaacece0c5a48d944507c6ebf0c9fb8e3e. 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/QZNWV2450116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e545d68860f124bd8697f0c5b68952fdb4ca131b70445d657670bed76216fe. 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/QZNWV2450117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2c81e9e21ad0a2fa12ffcb41427c11cda7ba72b484c6b15e4a4b7472357c2b. 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/QZNWV2450118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea539478149118542409eda7068f3a049cb7ee8867b24fb8427f0803ce22358. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZNWV2450119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce20dc1ac770eb057710867fbd215cbfda061e107e917dc9a82e054b9fbe7544. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZNWV2450120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859bdf1cfd2a772677379fcbd2612efbf63345b75402cf479da683b880f81eea. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZNWV2450121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891380c0b380be0bb0a5975414056e64ddc945896305a4f058b93ca8bf1a403c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZNWV2450122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd18c3e4b4b72aa23bed777a573d61d6bdcb379f9dce29eea6d9c9664fbaf12. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWV2450123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc5ec7f39c21bf7b72693fcfe5870842fe2d008ecdbcf349d089bf845482357. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZNWV2450124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6846a73e04159eae04b941d5f832f02a2f5f7dd2a9eb96f44f952245c75c38de. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZNWV2450125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213f34b958e6d61db1302ad189b738a374a89d57765462a56264a6dc79eae293. 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/QZTB82392902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213f34b958e6d61db1302ad189b738a374a89d57765462a56264a6dc79eae293. 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/QZTB82392902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe337dfdbb83c7c13f1cef2ae6fef10eec90e224309aec8db74c6463a4f8c470. 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/QZRP52305614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1536f97b8286ea778d92bc6e954129805e0425f74c7ecd5872c7d17cced2c7d1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNB82247799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a08dbf53b6a842cec78db9c838b1c9456eb9de9f01269cf289db908e9cdee7. 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/USL4R2437572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c059b6c1c12199cf0073412738dc7d4865adf6477fda373c27c7e0b0813d2a. 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/USL4R2437575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a4a88d0ba4d8c6635f9cc9602c8b57ed452950a2d120163600a6b1d170cb59. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN32399926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63f24b5a150c9b1bc9118532cc5a657ff9435324f0e9758dced365cbf44e4fd. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHN32399927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50736ac060b5e622ccb10a480f96d2ea022c6465ef8cacec76420dbfd49e4faf. 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/QZHN32399929.