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 0x5796f883b7364b4822a43cbba7b7dc0b74839dc626099f82f3d0b5ca4d518ab9. 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/62ed8638-ee53-40da-9913-ca117a6fa6d4.json and https://artists.proofprofile.net/proofs/artist/62ed8638-ee53-40da-9913-ca117a6fa6d4.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 0x3a34a8f6414dc538ce936eb0e1d3edef08ad76732c0d56733b62e5b252ace3c2. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:53:05Z), 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/QZFZ32005817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c67d508be2a72ae66193757255900bbd871a2ec6e9fce6eac30c480f76de85. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZ5FN2039850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8e9fb10bd30ad8f73f3ce11014524b35ee552e92b0589fe6508520b23dd08c. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZK6K2043795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7d175b354a79a410a33925b36937798cb69f9d0d8d980c413a81033a1d425a. 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/QZMEM2007677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aee1f42f47c304a48d2a1213628fb19664f068b96bfcdd2f91882ca3e4f5171. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZMER2083146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc004c723ae8d2a680cb611f90ab406e39c2c7ec71150f5cc41a13531490e924f. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/QZNWW2006699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34fb391dd29418a9c0b16fee90cb06dc6616e779e4087da071eeb4820483709. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USANG2130901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07b7017fde61d8f835850d5e065b2be7a52a23e75298221a6981e6f3c00a838. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZN882138670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70d7e97b8b0d2f8bb978d200a98054f72e3461ddc2a7dd603a5376c759b6857. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZNWQ2152970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf0cf68f87df89eb0d6ed1e058e70e4a57ba9e2837cca2592db9f2d24ea39b6. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:04:47Z), 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/FXQ892100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bfb40550e477600e0ad954740de902b9509ecd339229fc81b926c4b025ca24. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZN882184858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf90b4e924bbd87d52518edac61d20f97a5cf01a57f0bb519391347d81049c40. 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/QZES82288154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf673e2c2902ad17e66cb061304d82e6309c828871b17d47560cb75a7066213cf. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZK6J2270855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a32dc8f56419d82df142d4827a7000453fdabfd6e457a54b8e8847c100405f. 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/QZHN52379629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8501b77cc40803d053483b81b669af98ffc538538878ed0b08b6548f52b657e. 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/UKZGC2202955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b4158f78dc497efc5bb9321e4866e317cac3b3db9a43ee32341c9d19d7267e. 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/USANG2120629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c38b367ea21a173356573bcfd93b01fcf165b91c752fc352419d9d3b37a1aff. 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/USANG2103742.