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 0x1da7db1d76d203f2185083f81b2e4b502c0ab46629406e19b71b1d5ea9f0f3de. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/122a7ddc-01ff-4904-afd6-97525ae79bc9.json and https://artists.proofprofile.net/proofs/artist/122a7ddc-01ff-4904-afd6-97525ae79bc9.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 0xc9398d053f69db98635e6eac6807f4d824855f35c1a1478395644b6da432a23e. 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/BRDEP1800144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f82aef12473536fb9c682a167e9822f8277280bab65083f3662b8670bcf9b0. 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/BRVK92000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac571edb6f421dac09e885892dd79d8a33ed40f129cb9ce736478a621919ab3f. 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/BXSVC2300173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bfb09df2bdf40ef28002bf78fdeb5043eeb0a5d987bb7608db44808feeec75d. 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/BRCQE1900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2ed34daf5a57fbec17fe809615bc06f2b3ef7517e13618e00039de0a3475cc. 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/BR6YG2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cfd8260da5f8e7bbd83fb9725418db3333a6a811b220bb2666b3ac909364bc. 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/BR6YG2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c4d4ae7aa92f8f4d94df16dea380cff5bf6ffa7da77c984b95fb84941c7374. 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/BXLN11600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a7a1ad1765238a69d586457743dec11a1e0df94e3e1fae1abcc2580a35a334. 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/BRZ6T1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2fac25cec6827b18554b0d2cf8acf07f83de7bd3d25a1c48782f382ae14e28. 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/BRQCK1200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cec73b1e2fa40d4fcddfb4624f7391742c15a8c3815839772094aeb6afb110c. 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/BXY8J2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287e1d2353f0b7b83ccf37ec1e31b577812d4fea5b00a1b4e60cea89b296da98. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/BR2L30900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f149f27acfb895fc9fe1823bdaa1f20df49f86a926eb89daaa040ec06c77593. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/BRHXF2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee977614629f4deb661498c650658a918fbc0dcca7c0e58fb99d12845eee155. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/BRHXF2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4346bf74682969a810f183da5cff70f409f6111023e76d7c63be926adaff1bff. 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/BRHXF2400010.