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 0x6fe35e1162c8539ae79abf22c70a251a277bd8535135e0c65df0ce7970ea1999. 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/8a3fcd1b-118f-4e94-ab1a-755e13e08c11.json and https://artists.proofprofile.net/proofs/artist/8a3fcd1b-118f-4e94-ab1a-755e13e08c11.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 0x29ff75f5fea0ac582631f8ff079d8e5568ba03180245b2cbd8d298bde5d6c35c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHN72212929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f74717b3374846192a477fffa7457148511234be642c34550d410d8ce0bd18. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZFZ72393284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb864cda1cc103ad33a9a4a2327ec630bdf60459a18f9b89e70b747b46aaef292. 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/QZHN52365121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0559bea2e3de504939f61c16783473253c3933d1fb024fa27fe023ca0d71e540. 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/QZK6J2354561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8820a5a4a04a95fb791ecd93f89afec408f4843c2e51da69a6d4bb841d130fb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZDA52311379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac7c314184616421eed4a30f17202de6f5c8f421de457ecc817635e03d13891. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHN32495100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533f93b7b69fc08274d9e0f81f9e312547bb32af8d78cc9b05b6b111ece5af81. 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/QZNWS2499541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf165fca30426e76fb0d54ed8c8f618f9ff288c58b280db6c6699430f5be9bb58. 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/QZTB32430614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0024ee02b2ae733cb42d36409b4bf257e42289aed9bd97ffb06076fb3e2b14. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZTB82461732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1818fd214e95ff7c1f5057c0ecded53e42223b32561a68df24f3b9526aee368. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTBF2426229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62407dff1e043905ec018b829e284f7988946483a886a20c491c8e09aadc847. 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/QZZ7P2498901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae36611f29018f93c80a1002c44d0551c28417200447920ef564c27c35195eb. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZZ7M2496074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6084ebdeee9e81d938fa7919237bd1ac4471d624de98c3835e28efb6837ab3. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZFYY2542885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed52e76a0e81301f7d8f1ee9615ea5e5dbfa84ed2b4ec2e612237c6d6ed903c1. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZMEP2540589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1dbdae6b18a0752f021ac84db3c6be172ae333bde271b286a45646098ac64c. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZTBA2384975.