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 0x35425f7d3ac8c125396c83bbf0c6a4c70ff051edf972733e967fd19098bab044. 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/9ac4cc75-482b-4931-af1a-e42ddf7a4739.json and https://artists.proofprofile.net/proofs/artist/9ac4cc75-482b-4931-af1a-e42ddf7a4739.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 0x01426ce665e2f908472fc8b28e3a0d82e03078148269092826a82e69dc7534f9. 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/TCAAY1170428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156413b289e89d860f53a6ec71e98cf7c0390ae63b7d8319f5624614799793df. 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/GBBPP1602102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adb72d379e101fa188771746853128e3dc5d2e1914f70ad1e809242c2613f42. 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/GBBPP1602108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065b9ba7008a5050d1349b96304af291ec2b548ff5af54b063a776fd01f74d13. 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/GBBPP1853446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1ca1ae1daf7a345bc95a8d7f3bb572b0e434f6403bd7921c1cdbeb6f5eaa3a. 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/GBBPP1853449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd8d9b117572fb147f7513d021916ee0c85410d567c77a0de1ce37b3b2981a9. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/GBBPP1649915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8193de436b27cb956d0611ba2a2a749a771e1dac587502c7f15c931a879a09. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBBPP1601502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8406ce2a6e815ce760bc6602089add13ef535e0f69ce3db279f0af038e490dc. 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/GBBPP1601504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13621a57715d1f19ba4538748cb2c63e3ec17bc00c648a8cd85e335476d5be71. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/GBBPP1601517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563c1c15eaa33954e8e581f340363e7fc0d00631ed7eb70ef05ae4ed7ca561e1. 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/GBBPP1509701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4b9e0e321cd96cc6a499e3b0194faadebd23cccb196e4edaeb1f6cb78bae1a. 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/GBBPP1509703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d7083d0ff14b762f67cd36ea4b7c0f541275dd90827e7a5d9e2d1b08eb2b80. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBBPP1751774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45ba5583fb23079ff8c37dae0ad6cfa9e03bbaa17af8fe03ed3e2fc8bc5614c. 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/GBBPP1751776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d23e86ae631e92317a4c5bf6e4cf962684169abb88d20fc5b6cadee3d190cb8. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBBPP1501305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a9cf926e1bcec741e5c74a74006203ceabeeae6935e022a79130229954fd04. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBBPP1501309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba508448debeddfba733180d29e4f5363d739d24b1df5c9d7ba54aa59957d865. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCABJ1294722.