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 0xaea44ab876db6708699e10018de39fa14f237d33023d76a517f5d6eaf4ca9c2b. 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/90a1d953-6f9f-40e6-93d1-99b738fa61e3.json and https://artists.proofprofile.net/proofs/artist/90a1d953-6f9f-40e6-93d1-99b738fa61e3.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 0x2f06020ffbb771dc8ab446d03aa0de2d3d534334d01a6c7c7492f7a32de6b3d5. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZFZ32078194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4363f51b373270e4d6c6c1dbb9023f41c59fb337c79803bc9309e55ce688b440. 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/QZDA82077545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89408f81270466bfe083d56de6d030ed196f55e731b358d539f88e44d0882423. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZES82071909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8d3409fb336db3b105a532452f6bc94a21315f349d4d6e330a85f17ba0255a. 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/QZHN92015786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18700e0032dfcd5b88679a1eede9fa0828101109451f9c99787d62345bb8cc60. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QMGR32253177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f743556329bacde2466f402376c837a76849cfcaf74a5f08aef15edeef1da51. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMGR32248831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc0c2ff6ed56bc7d3863a3c10c3f4786607123c542042434c84a34d1b8e554e. 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/QZQAY2132001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe164ece4cd5281b950213bbadd88933afb7533fc0bfc78afc339f9f061838472. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6Q2108792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69f3fe042c196a5b70bfb796f5fe2f6ee74d3a0ac93ba6d9ec34db66ae1428e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTL92134366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2937416bd9aff7ef2d4d1e527624f5b8410b1aeffdab4f9953f17451bdf8324e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:20:08Z), 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/QZHN92250190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa574bd5ff5e5e9ad2a1e872c288ec4aaaef2645bd6d54846ea44e74479710bc3. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T21:38:19Z), 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/QZNWT2342685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ce5acd6a70319de0a58ee318530393e6844b406e3847e154a3a91c418cb342. 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/QZNWX2388697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019a27c150429fd3c5d04d8491a95c6590a468e6c9e3258202f4457ff29d4afd. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTB42306021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf795cd7e03ec99709c362d750f032841d22f0271f7268f94484e5b6196433f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWFN2383428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761c5942f9702b26c9176cb2e9c8b4ec9be3acf75adf00789f7377be7661254c. 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/USACX2300638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648ce29b8793f32fa376ef9ec68fa82938fc87dcbb02de534a2630948537bb7b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTL92194839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce911705984bc75c74343cc44541e8e1095217557a1cc989576d0ff3fb2845e. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:23:23Z), 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/QZHNA1943598.