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 0x5543acad51de0edab8aca8c834ec334383461f7073f0c6adeeffa4bff0c18a26. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a8431da-02a9-4025-871c-a6367f459b72.json and https://artists.proofprofile.net/proofs/artist/9a8431da-02a9-4025-871c-a6367f459b72.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 0x919dd19a6ae6134c1bdb60859df5703982a466abe9a493174b12acd7bf0e749e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZS7J2201603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4819f8aba07f3c93c1102c73defb35ca6fe613c910bfd3f74fa84eda4c15ea. 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/QZS7J2200604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bfd0d32bdd337f497f07248e2878a12c7bc1fa4909c3810a720672cd7c88c4. 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/QZS7J2207761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a1be4473af307f66fa46e4b6cf4de09cec125c4bc5bc4b53c3e2385c795622. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZS7J2292524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd947401911fdcb11cc22a098652fd4d059d3db35be7abed38602d8b430b1502. 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/QZS7J2298329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42082db42edd713f313df7e072422f8b1c31c253d6d7d55c5f7cb1b311365fbe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZQAY2280463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22adbac5d9a0ea85d4bddcacce43f79fe4634ef4800f1aa732711965a0aaf09d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMGR32109744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f7e511b552b312cd24f2274bece7e80d8819264e32be78d3cb38c30efe2f92. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZS7J2261244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33995ee5430806bc7ae64910387264df5919c6083e4e8db9179acbb8a3682fb5. 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/QZS7J2226993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62714c3f66ad2070107b3bc1d3281fa3e9f2363b528b7d7ca4ffc8636e9dbab. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZS7J2295619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9066e49ada95ee234f76d82b33ad1dde28b1db442b98684118100e8367cf2f52. 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/QZQAY2390712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4949222593613b2c1e16431fb3c37b4a78b8d2733d93f40ab8c64c043efc72. 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/QZQAY2269132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53564ac6d7acb301fc401497f847cca0afd2ddab66f3cc4026d7a55e6389a9ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6N2312536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45269e4f93dfbd9b01e7d4a5f3f7cf0f1df68583c83294088388f5c450036ce6. 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/USLD91754717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a5355d0ea1a4471d1f12e3e1c75dd3ca2ca660471239e4878e86be8a8eb738. 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/USLD91755423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ea7fe8ba3017b0c31d00d5a43e67f1b14176c75c3330dc8b1e4eec3e11b2b4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USLD91755424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b80077cfc6d848a9f6a1f775031e9553704d71c131eceafa6296cfda9412bf0. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USLD91755425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf591024a5370cb9efa778d7108caba9e2e7b2ad7aa99dec44b1c1c8e1e107147. 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/USLD91754522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2aecfccddbb685fc4fe3e44995a7a5f704a461a818b99cf365e8cca168d64fe. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USLD91753789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcd8bb230427b1d8e84c50b9c807d9ce570e61c22a270f5ead076d48022bfbf. 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/USLD91755426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1a17496a758c78a2f27939e399b2ede2561df2909ff5030e11ea6e52407359. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USLD91752990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd36abd332d15c93fa49ead34c1f7e1129fd868b7f9b8363013fe89c0478430a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USLD91755427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c26d1d05b8291bd748706e3fcd713c568f3bec55631d891c777c36f4c474ee1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USLD91755428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9e92e90cc73db908d0804845b9f83d0d819005418500cb45e4ca3b8bc0acfa. 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/USLD91755429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbf2a105f45b02a73bc3ef4890a8c22401c3e779a17de4a4dc1ea22e4776228. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USLD91755430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781fbb8f4065e2238c480a20b8725226559b39a5135d3949d27f5ecb5ca14171. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USLD91755431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774c102dd1f060081865c9e7725790bf601edf1cf3727603991d108054a6cff2. 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/USLD91750825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80921c5e108036301e5e12e7d234e1ff54cca231e6b69033b69c6941c0256fae. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USLD91755432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca0550a110122bcefc0cc590add8450357883ecd04708243bce01cc9a891708. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZQAY2323234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13156b2e649c432d871c024e56a62e94b1b5c163e028ac953d16708626db098. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZQAY2337386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d99a5e0107889aa8608dd5acb55976f49e701a1e2f3bf0bdc42dddcf07f94a. 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/QZTLA2396366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75852df7081737e8961fbe771a70ba6479bfddbfa77c79b2a13fc1917073da1. 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/QZSYP2277762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9782e9d24a5f33dfa613355a35fd57305bf16af174114a04a77ce2ab6866af6c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZSYP2209269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb841b1a1511eb72db0f96b9d611053311f04767b0e65b88f7f5c5ead20f94e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZS7J2240780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8809e1054fc27a5b0df959dfe68230fd37902421fd32bb4b4f5223203bcf73. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZS7J2217455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182434b949eba0b737cdf95ac95376acd684f60808b1e6ee513b5fe7e7d8dd13. 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/QZNWT2234456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a477bf7beb33e4e563b43e86216cbef25d1fdf2af74aeeda94f8f8e2c26c60f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USLD91756344.