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 0x9b100cd944ca7389922f56625aec40730f2d8dfa8852afe6b18cd56059da0c85. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db918056-2943-4780-ae1d-eec2946884e1.json and https://artists.proofprofile.net/proofs/artist/db918056-2943-4780-ae1d-eec2946884e1.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 0xe7425a2dee4cbb6e0a235bee097f6ec126ef10a5af4a9209479c28e4b87adccb. 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/ESA092316078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6fafee91247f58638eb5d6c9cefcec56b7ecc580d829a158f16dae10db82aa. 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/ESA092316079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b2cf8ae2a4580be4c850d6dabe6dc8db2751847c4235e464676acf69c5412c. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ESA092316080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec939ff6660f23e157d9913ca854067f41af476239bb601e044c24f2cf15a614. 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/ESA092316081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00b5ded9dc6167f32ff5bf0308e603e9216e0e365d90444292a9f26c028641d. 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/ESA092316082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48be7ac0308029eaf96fb90cd2493dc201bf814ace07f9374f837a25e565a33e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ESA092316083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd812b0f30a4d85bb1d3c3633dc7fd09e0e5b6069c64ac1dda49f5f67d4389faf. 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/ESA092316084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e45bc1e10141bab4da0a2fefe59ff7e0a599c15ff17855e7e38b03137b0577. 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/ESA092316085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1e5e0ef16bc21c6625e49f01107145e7f7cafae0136a307ef10c3bdab13ea2. 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/ESA011871441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1d94976d6fc667cd4b5412e558cf16813fd4b90527641d5bcc5c8fd083a5af. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ESA011871442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135a196589858be2633eb9a289d7ff722e08751f12485f3c61620ac4d42d1490. 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/ESA011871443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2edd468505a502ce58229c11dca0cd7a330ba83332d1e55c30935ad9b05f7c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ESA011871444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5f7de7b9b9a9c42c277253acf251c61329190e2b4ab0b9b79fa00a8ff4723a. 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/ESA011871445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5b0669144c12e84af3c8ec1c536229da4d8f962c76da3777c98ceb2914c27f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ESA011871446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7865382e86c63899d922a4158a483109181f5269c05339a255b10c8b0eba5f91. 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/ESA011871447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef6c965bd6b829b9d4bad026dbefef72ae7f459d7c035284a393913e877c657. 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/ESA092437468.