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 0x67cea5cf5712ebe45959220f88e04f5ec76d8991b0aaad1ef5d6484f840fede5. 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/1063b145-09f6-4eb9-b06c-998fb99fc41e.json and https://artists.proofprofile.net/proofs/artist/1063b145-09f6-4eb9-b06c-998fb99fc41e.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 0x0d0be84755200567766073ddb1d596a5df17abc5fc8a9c4ae4bc9be723dd6251. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/IENBD1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06de1df38686e1f2ec4ad7a60b2f99fe7c6c8eed4047057343bd5b637e1b0932. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/IENBD1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e42f96b22f38b01b7801d9a0a01fd1cd354ed4bbb474971ff081cc36819756. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZANL1754794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf9150acb4afee5ee5010920ef1eb2030cf742b1f6e68e8496c012cbf768aba. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM4DW1825480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaecdeecebf8b61c5771618764c7e2316b07ca57916561fa39ffda5aee374ee. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/UST8K1855099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f497e8729227748ed6dd26a1e00a2c16239190b5b102f55ad5477b0d82340e3. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZES81906956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2527b861973ebd192df741eee4e9a5b0770cd596624e3c1a121f99a1fdcf1d. 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/QZHN72215477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac506ac40b9388caf692363ada3fece7d7b70bd164917f5d31dfee631b20ca4. 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/IENBD2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc775962422b38b903bee1bb0f1a4c5752f7e8c41f446f6b902769ac800b9d3c. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/IENBD2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192e97c1c8864428d118c954845d558f67c58a2825743c300539183ac7193cdd. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QM7282473598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c2021e49f7095b4ec49097cea9bf5fefa826cb7d01ca91008db7e0f4eaf513. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QMFME2401057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc4fded3ba6dc4907867f80918b098c61895bcd0f02153b22541777aa1e83aa. 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/QT6EG2541881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b880a622dda80fcf13948ee8422d688e453a9896fef68244c6a4b725ae11ea5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IENBD2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b621bd87d397d660396349d1ecc4c27535cbd50471bba7e6e474ee46ad44905. 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/DECY62200056.