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 0xc8c511fb57cb7d823d8d4dad6314fde457e85a1943eb46c2e720a4036d42c8b8. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f00746b2-caab-4e60-84e1-08fc73dd0ea1.json and https://artists.proofprofile.net/proofs/artist/f00746b2-caab-4e60-84e1-08fc73dd0ea1.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 0x39aa6d0dda6979c753f1cd184354c6250a7930de5ecab63496c7a37e1ea2697d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBKQU2408157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac34d0bad6c4c01fbf347d33311f0dc82c4407d8108d89dea6cb2663c25ddd00. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBKQU2408158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66041e4f23c651ca27eb28fc67c04638590f08a0982986187acad76214f9f816. 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/GBKQU2408161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55b144fa3b09765a515ba78406e0cf7ee5f9e0b35b3b27549329b637dc21043. 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/GBKQU2408165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424651e7308f359f530dafb72b7e55dc29a012a3a9106c7514ac14a522989090. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZMHM2325927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2320e317d3b49391dc9bf7fac0571229241eae78d51754a8ee841d9d20f082. 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/GBLV62307566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699e8cd68828f8c28a176bccb20252099451aaa54bad6d4a2d94108be418c982. 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/GBLV62307569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bf2b84eed43c8900cc432e6c02ded6b1b25e16c0eb6f3150ad8970d30593bb. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GBLV62420085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2ddb09404c631631a3ed4fb22239efe44aa44650258194e6fb9d950fbbb8e0. 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/GBLV62420086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58162a9c1469e83d6f2063dd3cbe3d51e0c1cc5a9b6ce510c2bde98f8cbba59e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBLV62420087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb16ff9229a4a7e25b3b99f859040a834b72f2e478d9ced3a422deb9266f1736. 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/GBKQU2311501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6f729ef6cfb93c031280cdd1688b1c40d6c129e66bb961aa71a097036b14fc. 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/GBKQU2311502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d330e4e1bb44320acabb7d107d696f66d076699408f1204e7efa8e800a7ad6f. 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/GBKQU2311503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84752faf5f9f017b40ed8a4bca70dcb2f75c32210895d07e938866f85afcfaab. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBKQU2311504.