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 0x60e68eb9552996f2969ff93f2d98bd09a8997be32f604de19f833f8794232b4f. 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/82d8b99d-45dc-45f5-b358-e8e178663534.json and https://artists.proofprofile.net/proofs/artist/82d8b99d-45dc-45f5-b358-e8e178663534.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 0xf5ee396867a9472d240b3e92e6aaf03b66db5aac26a76ccdd4a15abccd2115a0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ES11D2100644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9bbfe48f27154aaae0984de3189fbaa0d54a7db40fb87a03de060a749dc79d. 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/ES11D2100645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe15653103499ad306dbeb2f97487bf6da0f3469e99944ae8a24549c6768e37. 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/ES11D2200780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e520706e43612c38b1150eaeb17d5e6e007b2fe703c1cf3c0ad9abf22c249e. 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/ES11D2200781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af6f9d4439c651032a460788b709ca5907ff2cf766a8fdd9ce107d8ebbc4bef. 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/ES11D2200779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e520706e43612c38b1150eaeb17d5e6e007b2fe703c1cf3c0ad9abf22c249e. 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/ES11D2200781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3331adf68525fee9576caf222cdf9515a815d0423f95a7ceb4c9d9586ec9d3. 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/DEZC62333979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea509323f071aaff1099717721cf0e20e93587cfa9b8c95502f9f8086b9b375. 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/DEZC62333980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b80478b41d86defb2fc5c1e42834106e3bf9b063c6e24e821b3f3ba5a543781. 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/ES71G2403748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af6f9d4439c651032a460788b709ca5907ff2cf766a8fdd9ce107d8ebbc4bef. 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/ES11D2200779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3853188492fff32f88738298cc6ef398d6c682b8e9151ca5b41ebd538042659. 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/USCGH2034658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe698a2365f6360ff17437fc80866978f947a7367ea0f6a03f88e68b378c18eea. 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/ES51G2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60cae052b5aaeec2ae88dfe50ebd601a5c16fde90d132557697823642cf9caef. 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/ES51G2300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef70005c457c28bf40452fec46caf5447cf7bbfc854e42ba9584667493c66be. 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/ES51G2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e019988fe76620d80edc9a286895bd5a5e6ab639e276aa709805567738c394d. 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/ES51G2300026.