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 0xa11d8c668ca03a7564f55fd2ddd78e824a8575e80a8693ca7a2522246c323f9f. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c65a24e-38a4-49d1-965c-8f3d6ae9faff.json and https://artists.proofprofile.net/proofs/artist/2c65a24e-38a4-49d1-965c-8f3d6ae9faff.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 0xfe6a6ec3b0823307e3418751a7a8b98366e45ea6176a5eb36d2d8fbbe8b427fa. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZTB72261294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d27958a7f4a091d50c028149bc3c49428d01be52a6abddc51d8b67f6cfc8c94. 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/QZTB72261295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f170c53aac3bdf9bca83b43643bf2568e096ed4c0f681839fd5fc5030bfdd07. 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/QZTAS2285625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d24a468c9b2c3033d3d93b98a42e99e6bfddbb7e6c61b10663beccaf2dba75. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTB72261296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9aba6f4d58a292fd2a0d201be2ae571ecf49ff3251138899f483424fafdeee. 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/QZTB72261297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e700ea48f3929f6d0d9f44f5a32c08dd9c6662c7c6fa9540b604651fb2fec2. 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/QZTAZ2262514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597c1b34383d65e526f2ada48589200d71fe11046fa7dfd2fca62031516646bd. 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/QZTB72261298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dfe5175f1737c980588edbdf0fcce94ce48a0aab6526c8c95b9790f8d60526e. 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/QZTB72261299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26dbf489730f8351c06e9802b44b5692648e565827b6e8c67cbe52ed61cca8dd. 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/QZHN82468360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9638ec3963025fbb9d68e1f9bc701f6d3b991f1e2e63bff84b7c1698d312a23b. 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/QZTB22363538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c911f84153d7e168719eae6765e0918d1dcf6dc864104604e1090a6a0e45f1c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZTAS2339473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a1de84a4b2abfefbfb25851ead12d51aeaec1128aa24839c4367fc20e864c6. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZDA52295169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a29178cf84ddd0d339609d093ea2017152235013363b2fa9b154a12ee10b0d4. 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/QZNWS2184656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4e7a4d500dc8dc55d58c2a08293d33499a99078af86f5101fe5f4379b6f7a9. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZHN32162227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed4bb0357e1127079e1fdc73b77d3874c2bafff3172a3c89d79fc47884e2df3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZES72144390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfebf679a44cb47197c2742b2c60b71764491e7299bfe32566f2b457734eb3c5. 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/QZMER2469566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a569b64051c316cf9b53b3b2c4f48ecd5202078c4e3d6f607ed5b47f5e13c8. 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/QZK6Q2255017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f5314737fab99cc6ab0122b07c6f95da8e1c30cb2fdd0483034280e4f27b81. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCAIT2465799.