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 0xd58561fb1a88e2f80537449e1f77baad7578b7f31778ca2fa6a0d696415370ef. 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/57e77392-0382-447f-82ac-41a62b480f16.json and https://artists.proofprofile.net/proofs/artist/57e77392-0382-447f-82ac-41a62b480f16.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 0xbd371d8bead8c5a2ed5229a7bac6d21f05662f132e83e1584e1a496ec79fc5a6. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/CH6541716791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cb59dbcf7926fe4f05f670d76ba95b0efb62c1c8725b4c9f1c441e602b5f9e. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/CH6541716792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37d344ad69acef103d229e0fd38c553883196c7231080c6be0796376ad6d7da. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/CH6541716798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f58bc6beb690e46075ab7342f6f0e3fa844ab6a556796931fe637a8cbcd820. 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/CH6541716802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f42cc7b6dccac3a5f6f0b20c052ae4e31d3f60b703ffc3f41d4b0a3459b4b2. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CH6541814358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d163f6715214e1e879d6319a447b7b30dcb4186ac9374e77ad1727b0718f027. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH6541814359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692c6f1c955a9b8b8cd6d2fac3d6070ff4745ce37048ac0200fa9603868892a9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH6541814361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b63d73dc2735ca903b66eecf9a24898cad26deeea2a02954e0512ed5f74a66e. 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/CH6541814365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a5424551ebc19babc666291c2c5fc0c6e0441f9b9f8a00ccba10a1da808c0e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZES62056106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8277fa72f70b752fc191ae9b2c598936b6c0272f920c0ae2714ed13f1a88fdc. 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/QZHNC2026887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8eea97bfda1e1fc1ee7bfa62297b139126da995b03c504038bcb039caf31c3. 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/QZK6M2069631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f9c28c0eba39c514e07c2316627d9d7f05b43b7bcb7c8a7004c2d0de6e47b7. 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/QZDA82168480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98c8be04149769c0c6cd2e19235cf58db22fa660623640d8b56601347b54941. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QT3F32474857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e49b5f1a82e6e826ac1160b904d1f432266233cfc5d9a1523e3405e55547a7b. 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/QZK6J2516023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c951cfa64e9b067daf5c3c524586b86ea564e8b24cf42fec5f20277a3df01d. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ7S2548084.