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 0x42b484ba2c60604957a6a8aa0fedf76514aeeff2c167bb550e6a02a812c4e30c. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc820f43-755a-4657-a6a5-8ab0d9f74cfe.json and https://artists.proofprofile.net/proofs/artist/dc820f43-755a-4657-a6a5-8ab0d9f74cfe.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 0xf87530e1e333107f97962d39bc3aeb3a7348c6a34c14b86ae5f30fb1555434e5. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/NOJRA1213010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6658a6aecfb0361c0d0f0ff4b2ad819baf31799f3a358531328d2f232cf9e907. 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/NOJRA1213040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd447772218c28b549cdb02820b141dc21b06435f578f16c94969b056b2b9545. 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/NOJRA1213090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf541b892f155afa323f12c65ee1afe634b1c8e0ce6a358374f5236ba85d57b1a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NOJRA5817010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2dd04224803136ee3f1db98aad3378473d3336ec7cfc9c4941e60dbe84a17b. 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/NOJRA5817020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21d9f44e4a42891c690438dadd2b9a2f2cc51e45a6176be3e7440762aad6660. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NOJRA5817030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a1a2a4a41ae324ceb716570e2d32eb6cd54f5713825839e47374d99f1ad24e. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/NOJRA5817040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc8974d188df27390fb81dd316efb3e3c76c2deabc29dac8044f75ddc39d892. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOJRA5817050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b8654e1845f6694f2fe3d1695c53826546ce6ed1ea8fd93b580031302059b7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NOJRA5817060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb12351f0c76396e8513f8800cc8b11f2cdecf151fb5850e6e7584603ffd007. 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/NOJRA5817070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604e289b8bc1e4ac8e6825ae6adaec14895a2adfa030627b60fa604bed682298. 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/NOJRA5817080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fad374ce2da083a4940075ba48e6faee6c1e40f2cd03199945a39076263fa7a. 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/NOJRA5817090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453cd3befe68f8113d0eafba19f1d8070e8180f8f38d2ca1dc11a03b61f0a73a. 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/NOJRA5817110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73cfc0e39c4f2feb6b353023d45240b5fa41c5ed19a8d00888dcb0f89eeb258. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOJRA5817120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4442a57fe60a0e28754440e4db06f974868cb04a9c6267eca88ed5f39824c04. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/NOJRA5817130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835665a9089db41ca14eeb4ab0d364a35fe7a7872b8e86b47f52b97204dd6320. 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/NOJRA5817140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286f9386d693dd1602b0e1c127c408985319dbd7f94b46e952212a647ce7ffea. 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/NOJRA0502050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3d13c7262f8220fc2f5e4760c621fb76fe66b6baa60aa0fd9867f9b01c2c13. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/NOJRA0709050.