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 0x875f8de394c0ee2ea88be53900a2cc9f054176162111700853513a66005a693f. 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/017b41b2-140c-4ea4-a350-9a7a1b13beca.json and https://artists.proofprofile.net/proofs/artist/017b41b2-140c-4ea4-a350-9a7a1b13beca.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 0x6a80e0180139cfb4978a8d1fba466eb5c03800b8acdb67d8da24cf2095285e49. 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/QZVEM2585476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1f8caf12fa648ba93063c2671cbc6dab0ceb908a8951de63823c77bd4af309. 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/US3DF2469675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb33d405112553c144b6a1d16acbda2b3fc2c2b29f68ed096bf2623a9a2b071. 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/US3DF2473131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9571e0655a5edc26baa4fc164a5a152a0115210c369f8496772bfd7f484d4784. 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/QZPEW2427575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d10ec143d950add6ce13968117a5a9af2f2fd02d2fe3076f51f3c2924bd1f79. 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/US3DF2416127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42e4a7fdad66a77c5d81976fbd2168b1b5b10b31988d7f3c86c242052b323ca. 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/US3DF2420054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc298dfb0f5ac00ea6144cdc5ddf8725db9304cd2eecd7bdf49cb0448c5c32040. 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/UKZGC2401728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0a92782fbd4f55f5e61deb004fa9915b9cb5ebd235f725f2c9ee0575e0ede9. 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/QZVEM2382269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c5c2ea9f7192ff73d5903936c1bba6a854fa805a6f807994c7449e226987b7. 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/QZVEM2382272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259dab3d2c6470bd1b90ef0f26b078db343bf419a2c482af20e7e25448307e77. 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/QZVEM2381780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f27b6cc077f32c7ef710ad85bcfc4dffeab899f150c3690c3895de934dc440e. 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/QZVEM2386826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe91a0436262083ec83fd62f531804978beb7b9f26791d3c8f0c0c7668145b11. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:22:14Z), 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/QZVEM2345384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf504e60c0a3b52b69cb521a5bc7113d7169180629ea6c79e519d6e1be7167522. 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/QZVEM2345387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb47a6fecb84fd78928b8b0f01dced889e4bffa4d8ed415e7db28d47e5f598ce. 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/USANG2413009.