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 0xdb7708b9041a5cf5ac66406390483e915cb8eb1b159236a0b5bf6cc1974c9650. 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/84ca7c49-663c-4a00-8981-5ce32418b5ba.json and https://artists.proofprofile.net/proofs/artist/84ca7c49-663c-4a00-8981-5ce32418b5ba.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 0xd55435f5cf7c9c9673cf11f0b6c8ac9ee86bb0fef423b61b7bf793aa18276fec. 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/USWD10628829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557987baecf78644a223afffce73ba692353a0b88c16ccf0235e4afc26e128cc. 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/USWD10628875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc46dec2d045fb3fe5f74af80066809148a6700b2b58041910fc411231e36284. 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/USWD10628908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ee40998b2c9e1db7038950402d139b89fa6d42b60269ec338d33c582cbdb6b. 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/USWD10628910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba525a177d605e92a9ab0a9ed0bad9cea8baca6336740debcf238f389e014a9. 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/USWD10629019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9ba2935154f4fc000393a1b73f53a6430359b33e03ccd99f52e754c6a3f719. 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/USWD10628874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b950a275e6625d1ea82129ecc43fa613331f39aa3350a87d7aec39ef745c151. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USWD10628905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c62ae992a243900ab8b10058a35474ce072a4b1e2e655d359bddc25ad1c569. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/USWD10628907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fda3704fe6eebbaaa0baa5b8ba89a5ec2409de864fd46174fd07a437a66bb4. 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/USWD10628876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf650ae5710fede07043f6ef7d56424ad14914eebe855dd4da2cf8485a2f402. 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/USWD10628904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435afb7c4753386874c3eac7f3af342f9c427fedf77f95f4ced81f75a033bb56. 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/USWD10628878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf891fb3211222fa7f1737f1181bdc921c588a0a0115b05b8eeb7bb66b8c797e. 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/USWD10628906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fed907289d1bd09fb99ef3cff03fa0c5e1f7310dc1ca37d46827585042446d. 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/USWD10936356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90b88a892211ddf5f7caac32975f286f704bef587fe1dd045bbf209e4801f99. 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/USWD10936357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4adde3ae683f1225b6a3dadbb048e402fad979d959a38095a8787d3e4b4dcca. 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/USWD10936358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f75516a46cd94d953b19888804ab2c040848aa4e8cba33d03786e177b1de5f. 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/USWD10936359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2472468be11f04bb77527285601328277016502d4e20f02908520e6af92694d. 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/USWD10936362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771cc2dc86e2d285e39105f52f8b2c501d567ed28fec4f542eaa60b9e866ac8b. 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/USWD10936637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8695975c1d3475936c8bb8a678d0f143047b418dcf6bbacf9aa77479274815e. 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/USWD10936365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd080bd01cf55c3288f82b5a4f5d66df08c7c9ed717cc65cf9bb4eef2dfc5aeaf. 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/USWD10936361.