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 0x04506a125d8c2876c37f3c41fab128d58d2d410cbc8c0c35e780d1c8fb5c84c1. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ddac44c-c0c2-4a1a-bf14-e363ff6513b4.json and https://artists.proofprofile.net/proofs/artist/0ddac44c-c0c2-4a1a-bf14-e363ff6513b4.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 0x2b651e85d81994abc84118df98bd7400e613642cf33ba623240f362e430a2ede. 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/QZ22B2044774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7174dc86fdaae8c939f775f3b68cf4739bd1ca0216781a64b5bd63926cb410. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZ22B2044776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4f76361873ecffea7eb110a308c7933c58813d7ffbe7d6f24b73bf135bf817. 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/QZ22B2044779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed80fb648572dfb03d4e09b8d5d65ed986c60078b74cfd385e57cec80172d478. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZ22B2044781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf432f02aa483c7b30ca7b9ab93c43e329fe3a48dbf05c3f2e09beab92e0b3164. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/ES71G2151647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c278ab7d6ca789500a7356849b116eb1eef02e6f59fb496f741f23eadea142. 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/ES71G2151648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d043caa06a23fa29621592c4f29c540adfc8a24cb1713f11d32756e1ceb9ce9. 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/ES71G2151649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3a2a614a44fab2d1837b8826c71c02c2212f4350e84fef966a19a596da7952. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/ES71G2151650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d7ff9a3ec8400ca404a1eccef16cb40aaed9dddebcdfbbc87e2223fdb3ab31. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/ES71G2151651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306f2be2c55a5ef5061eaf66e99a08820528a5485ce63a838d665aff3318e022. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/BC4SL2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ba81bd374b13c32445bf3d882868f8a83561412f614d2232084c51a44137ab. 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/BC4SL2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc533467d45c1ae5fb6cb9dbc55a1f3d8a580d5613997576b43c552a33467be79. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/BC4SL2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d239b8ae874dda75b5a97398f3e6290b444565dbca29cc4280530c588990f1. 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/BC4SL2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f2d7882337a1d2583ec2d482eba47c98cb104efb8a545343357247bbc2cd59. 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/BC4SL2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b02c45d25f211a3dda33d27ee0369a839736cd821bb7cde75fb26cc6a31ba4. 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/BC4SL2500003.