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 0x20b0408c53e9719e58c56131f5b4e802d06ed9912cabd49340c9972f8d112581. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5a6f5f3-d280-4261-89ed-a5a294e67406.json and https://artists.proofprofile.net/proofs/artist/c5a6f5f3-d280-4261-89ed-a5a294e67406.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 0x0528e9ca7c32324dd0ce51b7d91bd8ce8016d20ee18301a9ae324fcdbbe65121. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GBMA21968604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e5f6eab3e6ca4ee7fec4d04679a54cb39315fe3136dd9eafc0d586197cba66. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/GBMA21968606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318ffb0524d79e49a56901170c1fb667f6e6f397b207757af0417c05f64d1d3d. 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/GBMA21968607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4639f61be40dd1692605650062791df4e7865369fed57a68a17384f98626211d. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/GBMA21968608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61412c6505f1b298983e6b4e33fe17ad59a2c62c03c53482b2df8838c1356ed1. 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/GBMA21975451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ae0c9349580859d7d348260f6d5bf106ee00eaa424c5e89a2b784a206adc04. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GBMA21975453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c1ddf21e538c3c2d74590eff0ad1c813e7ffdc33a427c5b51011faec5a1d2c. 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/GBMA21975455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c38be8a7bd1eb7292b92cf34b516c66de9f08b4e7909ac3acd5082e64f0f52. 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/GBMA21975659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c4be48aaac3b6839386dc8d530683521f739098c182e4f6ca21aa2c4481678. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/GBMA21975686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ae0c9349580859d7d348260f6d5bf106ee00eaa424c5e89a2b784a206adc04. 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/GBMA21975453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b6223d3ca959096ad19d26c6b9e535d3be174c4573772846ff09dee715d66e. 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/ES71G1949134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9652d9d251aea3b9720997bbf5a02049688bad0d8929b62389d65c091950892d. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ES71G2006129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b401cb47911a85b71a8f65e9be3729788eb53f7ed8188bf61e3bdc042be264. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ES71G2008876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2697745ffa40144912893a661c19298209c3b0f942c5ea153870b4e431db5112. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/ES71G2203300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb712d12f89365bfffc33478bb059b9f2231dd9d8fc47c08622c206b52d45cbc6. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/GBLFP2541142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c8dbbf9c4644d9e8839ddc9d345d861d8818fffced323ed95de23d68d25cf8. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZTBA2318117.