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 0xa0d21a6c33239d98f1592d2de4e30e6d967578601f65976d350dad380dc1b64b. 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/aa938e70-a255-4531-b6c9-4ce69f32b004.json and https://artists.proofprofile.net/proofs/artist/aa938e70-a255-4531-b6c9-4ce69f32b004.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 0x46d401244d554dd867f7baf84cd641092d4daa1eb6cf7c8d917091d0979254d4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TRAKF1618941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d32718746f4403a2ba128e59b6580a1f1792a55a1da0579107c9e5499a2a451. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:56:11Z), 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/TRAKF1618942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee5e2b2bed725f6fe0c0dea32e350d4cf5ec3a41cf16dda1684863119d4cde0. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/TRAKF1618943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1764a829c3fa38f9eec71c03d232dff66b80e57ae3d2e6bb4494eef93f7f6e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TRAKF1618948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe114041b34be9a6f80da25784fb6eac8b613c376c9720d1eda0e71fb5a542d. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TRAKF1618950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78787cf404722b6cb78ef7c083150ab597c37324a9bc474e661c633eefa6120d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TRAKF1618919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d9bb07cbf16c5c0c5ac9ec56bfd0888c9223268af67924d335dd890ad19917. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/TRAKF1622571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ff40a25df800ea6371cf3f1ec4fc10a2f4eb05cb68679ebac138cf8037210c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TRAKF1623503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15425e5592a88ebcd1097f43b21efb34fd951bfccd18c3d2118899d90893111a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:24:10Z), 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/TRAKF1625610.