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 0xa4b035a340e055273adbd1373648808bcf2398477aa446cb20270e3887003c7d. 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/091e5762-5a5b-43bb-af69-638f5c7f986f.json and https://artists.proofprofile.net/proofs/artist/091e5762-5a5b-43bb-af69-638f5c7f986f.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 0x90507b7ea66c61f6b78cb3ce1ede855e91043bef25bd58171215c9e86be567f7. 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/TRAJY1511974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725f7048b0c5ba26c9114d8670d8d8786eeb2dff11ccdc9642b98ff562c7617a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TR0792000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2555baeee2384d528914c0eea153da7b13aada2364baaa0c02bda3b13b7f7cc2. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:43:36Z), 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/TR0792000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4914b51230753f124d0eb8fe4b03b5f23b701ec57441bf36f9b877b5650c9e56. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TR0410645738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56061257660b009c2f004a224253db7cab50ca3883b8c284c38ab0a043f3a571. 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/TR0410644281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fea2b6fa3a45ef3e04c9693ce9fc03814072293ddff71c5c16eecd3db86089. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TR0410645480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86336e62fcd289959dddf347437e2ecd1aeb38721fcbe0a1a291a89a52845cb2. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/TR0410645432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94595052ce0e72ab90392e190910df80e90e9f9d7c738099efedfeb70273b601. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TR0410645380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98553117f25e27b7faf60e347870283eed0cd1c882933d8b5b89f56ff52fa408. 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/TR0410644020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2218c2c0057bdb82d3ba4dce2e13da0dc78221bdbae956965206848faef68bd0. 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/TR0410645640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8157797d151de036bf1c88648439e47cdaeede58ee6eb4332cd76fc7df8c1d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TR9531300692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5444662c216c17f2c224e424dd5e5f27e81bd6c1e52252e917663adf4a447d6f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-16T01:34:14Z), 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/TR2202004980.