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 0xeccb3232fd13e57a116b4b25495c6740336ea0aded19e47b9b6d6e6dd668bf22. 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/b93347bd-65c2-4946-8dea-11903b88292d.json and https://artists.proofprofile.net/proofs/artist/b93347bd-65c2-4946-8dea-11903b88292d.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 0x81788c400f021bd8c0f7b2869704328e21377edcd2769830455ccb03307ed8da. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/USHM22036463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e9d283878d4cb8364eda8c7cbe0a3346c8c910cf4adc13f92f1aa0e1e6e1df3. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/USHM91710620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f55d0ca854fecf344e3c3c4a76b1b59c830e722f8664b433bfaf568cbe5eda7. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/USHM91710632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a90e006faa60d0b7c5f0e1049974de63af2ce095520f463c2864d6a6fadd80. 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/USHM91952798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3277a87e9720fc33e7884441fcbff8e3a758a9af8b4ae574b33049dc5b1659a. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/USHM91952802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7ec7626c61bc20473a1de9fcc1135745f3e32dd3ba39e0bdfb19cb51710b3a. 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/QZTB82373287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e047bc0dd3f4cfc42979669ad471af2d786a9803fe06f449fb4df7724c0da4. 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/QZTB82373288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593c6944ee8fc6746cfda617648a81f16adc6c865a2365aebe70b3067911284c. 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/QZTB82373289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f4aeb70cb499eab212cd50c6ca68ffe1e29c91113b40f17a80cc27324d47a9. 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/QZTB82373290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1489de92ffcb8097a01ca3f1c037dd7b79c28f968a6cd4af038acd98fe9358b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZTB82373291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545e4a55159659a8b7f445acbd31afa05335bdf188053e7dd4f4d910a741876a. 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/QZTB82373292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaaba0107515960e056d75135283161ff644cb5da8c6c76599ce82bf536c03a6. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTB82373293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7975e40a8915d6b39abfd24dae8c655efb9e78dc66a3c01c53dba8fb5adf1c5. 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/QZTB82373294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d5797eda4c9cc9c21526daee9b63dfcd9f09f3aa208bb17c73b265c382be47. 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/QZTB82373295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36658b7f1c1b9089f8e7b58849d2ba5f5be343bf19e6d976a94da7676678e4ca. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/QZTB82373296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f67b62a5940d5e1aebfa2db18886e46489e5a164519e613af32b91e05d2d4f. 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/QZTB82373297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15225fb6d70ab42cbb946cb6c2dfd454e47793fd0d20310642cda52995766e10. 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/QZTB82373298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c44f7432ebb5356505970cbc952b1ec887512f1b063966b4ab91f0437c49eed. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZTB82373299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c38c37a83e27abda95b445d05c06ed9b50416ecf9a5e89f164eef9cbac55ed. 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/QZTB82373300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c508dfc2fa4f893e1df7acaf733ff5118aec076dc0698d8b2eafc9b150cc95. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZTB82373301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0bb3a1a802f8cc9ff00629ff6a41d57d40ebf519051c27a07f70dfc895d225. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTB82373302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0f136c86fc6b9e093580b8e8732743d3104160f4a49de75a8cc46d208f0b9e. 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/QZTB82373303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4548ef4f8566d1fca4081ccb316f8b9c3f07ed56696f1400f9357ec4f45d1ec3. 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/CZA232300223.