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 0x3dc9bdc02bc3653089e1c312e8aa685e926de1e08061d7c560ad4281a3ca1dd9. 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/4c35b2d8-dbb7-4b9a-a830-ce98639ba6cf.json and https://artists.proofprofile.net/proofs/artist/4c35b2d8-dbb7-4b9a-a830-ce98639ba6cf.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 0x5ff88f7de44c5b4b8031fe99545baa6369f7ebe2efacd8a0898e22fa9090fc95. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/GBSMU4222854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54cba0b7fecd4820aefdc5743e7a89eb14c07bc7bc660db28c53dfbfcc01a22f. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/GBSMU5665471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a106886a0db15e10446806aee0f4026477d2a1c603760f038b2396e5273694. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ21955776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc316a39e3e24cb331ade48bf2cd0d782f073f43f7355f57cf1ec8fed696bc2. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZK6N1958428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98993f5a710b16a223a322bbf253a12fb96c43310b144dd0dd5a7e3f1787456. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHNC2080024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7a50a5e878d7f29abea2f5655947e6d82b245807b3d092c629361d8ce05107. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZES92117166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8549f3861c50370cfa8f54442f696426cd5f96d6decee34d088efd8e31d519. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZES92117154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8739e0a2e5f7622e5e27639de5290f9f3a4d8c955a62a31c450d0ec863159d49. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZES92117157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2316cac6e3c429eb33affbca533c9a38c53e4050f1c767a65b77307edde1ea15. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZES92117162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ae863b07dff681582aa47532e32bf095d7eaa2899f6405e1954d39a6958863. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZES92117167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835ae285a4c2ff03e090160649628272eed0556ddb86cdb281e07de8a04d59e2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZES92117168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfe88e6b518c717b6a74f73b92bb8d2180079025d78af97523f622c8284cf66. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES92117170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e2c26deee72a4e7d1d52aa7dfe7a3c7889ddda2160e33b61ae9c35dc747eb1. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZES92117172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba97d3a1591d65ee3af3824086d393bb8585cc0d5a1cf94d563824f1db3c219. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6P2379661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fddab42cb292e12f4156eb26e39e56bdeaae0c1ca461e76a0419385caa0788. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWS2334744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb2fc64a4256a5564d7e041fc87ed55f4ebee1f9d108944c5e3cac7b1986d69. 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/QT6EG2558545.