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 0x1639b25410e4506a73518f36857f4b90b23a2fe11648166842b7d968010bf810. 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/7d75eb82-3ff1-47ef-9684-4782d198e3dc.json and https://artists.proofprofile.net/proofs/artist/7d75eb82-3ff1-47ef-9684-4782d198e3dc.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 0x5ca2b8f6eafe774d0e00137881214fac52a9241e66c36d2ab3503a56e8ed3361. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWU2485804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca2b8f6eafe774d0e00137881214fac52a9241e66c36d2ab3503a56e8ed3361. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNWU2485804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfe2ce75535f016ddf69e59dd9dbe0c32f435b95774e46bf255fe2a98d1c23c. 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/QZWFL2443573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ebd1564478addf791611b8ee7f785aeedbb9b7dff472daf3f019cb9eac4552. 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/QZWFN2495147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec48ea72cf77600ed123ddf7a2ac64f4467b83fa17d748740e787cf3aa972fc9. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZTBE2425427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cbafcd4b21c692d3768e2b5b7fa1347dbc7ee234cdf93dca75c3c5d10315eb. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZWFU2445864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f067a0fbd6de2f3ec3199d91445d83000118f91aab6bad89c66d3070e39f7c. 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/QZZ792462104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f067a0fbd6de2f3ec3199d91445d83000118f91aab6bad89c66d3070e39f7c. 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/QZZ792462104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b564ef26bf255dbd3e185f943d1283265163a99f808d49c60e043ff351a829f. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZZ7X2406190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bfc92e3df4fa0b8a4cb65c4e6b5a36a9d88e4525433f360c2f4130559d2ac4. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QT3F22437918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2295bcd779f9529cd6a3d337664f72cc6474ba25a0dc025715f1aa41c1bb2017. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZFYY2542210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941b1b917abe865bfd271c448c1f059778d1c4b789a1aefcb689ba0600f7f812. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ42525269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x290e226ebbd991c0fcb73b13aed486ae0747424ad7a8ef029439f4b0821b51a9. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFZ42525270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x290e226ebbd991c0fcb73b13aed486ae0747424ad7a8ef029439f4b0821b51a9. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZFZ42525270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0b5c9b6462e38b9a8172604859a2862d27c6cc7e0a15cf22148b682aa34665. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES52506210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e529a75d3f2ae015949e6094b7d6e6d3a43538a04ceb679ff1e1f20ad6193a2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZES52506211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2100939a13d794d93c9702938917c95a347077dafc9c5f04cfb70ae7759032. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZES72581188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720c87f271bd41ff44ea15626bc0978b9c974eed1bdea05d933ca206294e911b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN82524022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78006f42a6e2f7eca1ebfaf8a9af448db64411059cb7c7b51914024bee8d8549. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZK6K2556474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a557b8a8cc6a43dc22cb5ee5f99381f43f7e86c0e275891543e073cd99514b. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZK6F2509277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e471bd3c8de89e77f773abb24b585da895b788fb89c892ff7c908052040536. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM24S2504222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0e71ca50da28c16714657cc3bb452d36917338fa0a1c9084d6d2b5a2356e7d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/AEA3A2028319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ab0b2c43639f6edb952f7f64e8ad0cb114a8986e926e09c6d6dab8118c084b. 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/AEA3A2062084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3b42ef5852d12b594494ea6446e05f5f387cae6db55c6903fbf917c8185d16. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/AEA3A2065332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571b0c1438fff17e46d480540b06a264db13980f9376e08fff0ab5ad4672cfd2. 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/AEA3A2097606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08535cb009c4c58629a0df8aca9873bf3f4bf34f0ac8f2a11a36a6e02eca190a. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/AEA3A2074342.