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 0x04dd5b951a3fb9133c2094d41eaba68ddd5518ffe35655a37cd13fe3226da9e7. 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/d46ff952-0f24-4b06-bba3-77f62e0ce24e.json and https://artists.proofprofile.net/proofs/artist/d46ff952-0f24-4b06-bba3-77f62e0ce24e.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 0xcfcdb4d4431f6e33b04509f7dd64bb6cb4f1117fbb53e6c44cccacd7b5bf110a. 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/QZFYZ2274202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590549c24562c10995c862aac9627c1bcb26e9a4661f1dc7f8defe29b673f65f. 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/QZES82268010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfcdb4d4431f6e33b04509f7dd64bb6cb4f1117fbb53e6c44cccacd7b5bf110a. 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/QZFYZ2274202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e755f9b66754e552748e585a2647ac61ac29829b2a258b8db2f3485f40ef7c. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZES82268012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6779bee82c5c77897f73a73fc1fcbb9b5baaa8f821be19e5b850d60ef7221b92. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZES82268013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59fae74449d69bdee09473a6ce32ae13afebeb4085654439be489a37950040a2. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZES82268014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90cced405c67aabb4492837bd630fcb9e7b6d4e16d208c88f5c3b5b59b075fe0. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZHN42251816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec22aa87b66ae101e98859192d653a7baf1c6e54a8ad08fc135fa8b6f7f23e5. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZHN42251817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7d551f17310b30f07544345286ac97e6f25ccfbd9f64bed0fe4125d441926c. 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/QZHN42251818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875de8824072854082c59fb5ad05c56f54e32420f9527dc12ac2ca3e8ae0a3cd. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZTAX2226492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2378d724b4ff3c67488449ff025f3dff32c902b0ba3d201b20e3786fc398a8df. 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/QZTAZ2333569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940ce52604a06a49567f60b71234c480c7e66866ffaa675a1f23ca36fe77e559. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZFYX2460701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7ed84177b22b6b43ca2c70803f87d111d76a66c0653dba6b43532ceeee3b4e. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/QZTB52488567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2c785defc4df8e19fd4289f6c1a6a603fc441a02a2ff906d2c408c56047802. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTBF2400770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d4728fd18c9e680855c8860b85b4775875f99a43c34510299a5ad8c9be05cb. 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/QZZ7S2421320.