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 0x119b9c0c14d1cc3b942d04d68700d243f85450e50d493b191c8a4521b6f49705. 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/03773306-2a39-4e99-b668-4b9454b2e97b.json and https://artists.proofprofile.net/proofs/artist/03773306-2a39-4e99-b668-4b9454b2e97b.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 0x583b12514e5ebbf94ba3b638d13b82c8abe56c450dde7fab75a8544fcf689454. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZTAT2152654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583b12514e5ebbf94ba3b638d13b82c8abe56c450dde7fab75a8544fcf689454. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZTAT2152654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78f5173e3ce3513c690004aeb8d7a83ac9a6e23b93a3e241807ca081878ae34. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZK6L2499874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296eea0e29215a7f39825d171aec5d5608049e685089b687cf525de9ca061f0b. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZNWU2418214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9733f1f1f9592bb4851b89bbaed8918109bc99b0be18b51fa23b21d916c8bffa. 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/QZFZ62425862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162f492ed3ae54efa099e897b79ea82c423780552ce9e7c38fca7b86420a601b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWFM2394846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e07487b433f0902634e0b573b9d20cd85c65b3003178d6e93531dcdd423015. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZNWU2418215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443d105de7daeb96c7581afdd4b2fb39a43b2be60cc09ea94e3e50c4d9e38e59. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWU2418216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3454397bd1a934829309112ec17ec08bc9102579a4946d08a75783efc1929b93. 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/QZNWU2418218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296eea0e29215a7f39825d171aec5d5608049e685089b687cf525de9ca061f0b. 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/QZNWU2418214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9733f1f1f9592bb4851b89bbaed8918109bc99b0be18b51fa23b21d916c8bffa. 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/QZFZ62425862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162f492ed3ae54efa099e897b79ea82c423780552ce9e7c38fca7b86420a601b. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZWFM2394846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e07487b433f0902634e0b573b9d20cd85c65b3003178d6e93531dcdd423015. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZNWU2418215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443d105de7daeb96c7581afdd4b2fb39a43b2be60cc09ea94e3e50c4d9e38e59. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZNWU2418216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3454397bd1a934829309112ec17ec08bc9102579a4946d08a75783efc1929b93. 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/QZNWU2418218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c14761a7d88ad7a7b5e3e10194b3c0067eeb599c430bcac7d1420a90f8943e. 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/PL31T2500405.