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 0x14bc9c6c68515830767f7a26c8cdbe1de73ee7a136a437b36d29009360fe92df. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/412c76d8-4dcc-4d75-9e0e-d1281ff7827c.json and https://artists.proofprofile.net/proofs/artist/412c76d8-4dcc-4d75-9e0e-d1281ff7827c.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 0xc84946346a10956b49f407002bf440689e392ca7242dcc2c5d46d61a45a39b8b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BRM1W1300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9a7e49076be2cfccf89ac733d934ea3b0a6b473cd9d78777020b036dc204c1. 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/BRM1W1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91d6d8f4629b74e6a0059fe5a37745ee33a688339c756afc9c15b013951d3a8. 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/BRM1W1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49a5ea81dd1d2e9a7522aa15582543a8b6912f2254c8a3091039aff397cf8a9. 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/BRM1W1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817cd9cd1145bd01026c08aac4a7ed1e63bd2adaea30183171580ed456818642. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/BRM1W1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e305d2c7f70148f916f68734628adbfb52396d601fca5479b06a24431888950. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/BRM1W1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca47546d5f3cc366fa3703fe2d579969e8aaa7880fcd052e5525463675d42338. 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/BRM1W1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776a90988b9bf03729bc38e0fb0593ea690762c6bcd6469cc25e359d11108d9a. 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/BRM1W1300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0799b491d0fc220c6ddabaea39100b6641a81373ba93a2d4281a0d73078e1d4e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BRM1W1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e2a2d5a89b31454ca1e1919d304783fcbdc70d900c8562b6466ba611213ed4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BRM1W1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4bf2a270b9b8a91fa52d2f23ebf70a57a408bba8eb675ce26a34ba59eb28a0. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BRM1W1300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84946346a10956b49f407002bf440689e392ca7242dcc2c5d46d61a45a39b8b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BRM1W1300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49a5ea81dd1d2e9a7522aa15582543a8b6912f2254c8a3091039aff397cf8a9. 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/BRM1W1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a31329ea902af2bb59b3d7a3fe91ee38129f8d9ed74d684ad33161a869b7993. 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/BR5IG1400004.