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 0xa47c1d5e925faa93077cca3451ba6c8e2fce82f79d13e8dda063d57602cc9df7. 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/0aca7f8d-cca4-4dab-a502-d80e7c1781d3.json and https://artists.proofprofile.net/proofs/artist/0aca7f8d-cca4-4dab-a502-d80e7c1781d3.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 0x20424a4617b6bdde47f4ac0d69002a56f8926a1cc8dfff4b0228a83bcf246388. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBENL2203351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f1a28c704b72dee2dfba38471a42b998203d15bf20ae7b0e5ecfa1e696fd272. 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/GBENL2203352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd587acbc597f0a1a1c716ddfa6b9a1eb8129a1067c358d24565a8a86b0a18ece. 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/GBENL2203326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20424a4617b6bdde47f4ac0d69002a56f8926a1cc8dfff4b0228a83bcf246388. 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/GBENL2203351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e9b717ce15ab423f3352cf84ee5c290bafdde6a7f49b685393dd8235f73dcb. 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/GBENL2203353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec338d7ddd6c138195032c16c731c405e8cd8f92e14db5a9a73120aec2df644. 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/GBENL2203354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3ba602b988c1e7915a23ffd71f905f3b6a010a9ad79fa60dfb1f2db1890cd5. 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/GBENL2203355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8debde56cca96bd1c54362d869faa830f4d7e84f01147ee1b0895445b780eba. 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/GBENL2203356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2250261fd37180aecbd0a168f6247351e4fefade57d2f256747acaec3ed4c1e8. 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/GBENL2203357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0c5f968884f3081ec134504392eba9f759c1d0dc2989fa073e0e42f3a108a2. 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/GBENL2203358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e714422fd0c254706c833908cf85f5cc411e5e45ed879d3f2d6123203eb91e. 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/GBENL2203359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd587acbc597f0a1a1c716ddfa6b9a1eb8129a1067c358d24565a8a86b0a18ece. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/GBENL2203326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c38ba41d49e592a2952694ab3a28e46cfb0ec8eacdb9d155a72a9d9153beaf. 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/GB5P52000214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c38ba41d49e592a2952694ab3a28e46cfb0ec8eacdb9d155a72a9d9153beaf. 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/GB5P52000214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f551b530c52b1a9d126177d9ced48de8ee410592dab245fd05312a287ecd85. 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/FRS182119517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6d013fbc94c0a7bf1889f8eb8bce586df9df253d1597d01006d093a89ca331. 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/QZHN72260382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929ba40a763db542d7a4e0e796998a176e21b8d0a4c760aea2687f183cce2e80. 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/GBUM72004299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183a54b1eebdff8e106190135338e4919ee2cc731d8bc1d326b92ca9f000917e. 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/GBKPL1960608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a309baf1fbea6a01170dca81e97dd77d34a401ae3cc278c225957810ccacf44. 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/US23A1515386.