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 0x08f8ff9d3c1338ab512461bd17ab9cceb259a244772053883645f2576cedea60. 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/2fccd604-b3b7-4e83-84ed-24966af393ed.json and https://artists.proofprofile.net/proofs/artist/2fccd604-b3b7-4e83-84ed-24966af393ed.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 0xadfddb53ae6176bf23d45804cd24bc253b6200f054b506bc4b47998b81db1a14. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEP2454995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3105afe08be45477d2ed489ca37093a9eed718e51c56484846850ef91ff1957a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMER2433474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf71209276f4250f865b3296f643a6f6296ecb3cde35b37d497138d9272af66. 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/QZNWR2477506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948ffd23209bad04df06aa8a8534ac4f73868ecd90579182986f9da07a2f4a15. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMEQ2463340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cfafd7bd92ae6acdd9252c4d239dd8bf542353778d0ca0af57cda6c18adaef. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWQ2404440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbad4c7492175c6a64263465c5f7669c1ac3375a20c73595edbd6ba485e2a0e. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEP2430359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3468f9e12996d0e5e1e465bf4d243e10720464addff56b84a7cf609d2ddf89c. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZMER2429604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d58cd0db1e32989d3a4295e2aa289b181980e69232dd30dbb1a0a8d7ac41e2. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZMEQ2424758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8abd3d4fd8cb517bd3bd6212a0b9f16dbd37d51253d1d0807ac504e9a37e1d. 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/QZNWQ2400568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3dd9197b5b0579bad66e84f9112fed398435c2477988e61dfa84bc5e6644d0. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMER2407736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5e64e1fd44f8ac1f74b694e4c3cddb2ebba8ec2651cc6f3dfaaf8ea2159eeb. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTPX2439904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a748882b0925531c019ccd3a2d797703bc561834d3635124c00c9285499e484. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTPX2439906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcea7f2f2cd3c12af85fffa7df6323f0594f2d0dee0967122ef2b4deb125e3b9. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTPX2439908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc36430c677362d06bd0e3f22db86757d765a01de3bea49ef85ce2ef7f940027. 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/QZTPX2439909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11273fb7272154221f4c842c4ffef328636ac69e10558dab313e1e101948e1b0. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTPX2439910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7b5b5534ef4710f4309cbd268a1d6c21e064e046f399ea99010c87a51a97b4. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMER2447311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955802a6f497e66e269cb77e20228d27479be90e25f26ab71878e3ba21d1cf46. 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/QZNWQ2406618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fb07f4d0eace0cb8f88a7369d4dcd87ae6f2d59c7ba6313e64a081a45d5d4a. 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/QZMEQ2460150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c2f520f10db4331f85b5cd91c57458dbe605f21ad5372aaf44ec29723f1a18. 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/QZMEQ2490810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53808901b6600b1af0d17db712e9ec530612089452f78e5f842166a2a1c7be1. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZMER2414767.