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 0x007b30d29b54b4ea31676d25a347ceca228bbc8a3d10043e61b1f951ce15bdc9. 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/8b842849-09b4-475e-9697-40fe4249644a.json and https://artists.proofprofile.net/proofs/artist/8b842849-09b4-475e-9697-40fe4249644a.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 0xffeabb5678bf2d7af6a792051484e31765ae409b3a1308c83c2c76d14927d46b. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHN81984560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de4a9449aeada60b3d3427c2a2414ba716aac9bb365c99fa3309141c26b3c6f. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZHN91907808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f8716d04429490494a2fdeba5aae2637872fa7aa7698cd71e6a1de93028217. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZHN62124086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728cb060d8c67d11ae5b3e23973ca5f01a2728744c268d51bd895434465f520e. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZES52283978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe494eb62e17b60d226bb4f28f7e73762e797986488778dcca5572b6fcfbe69f0. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHN62263498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92955b0fb316b73fce1935ec5413bce4d15d45adb9c3743049adee414e686a75. 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/QZMER2296230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381318849072627a0b811e6780a016826e265aadbe17b8cd4ea98dacb745ad35. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZMER2296231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8b3b98e1b19a47fdcdf8911482d27736abc7b18daa7a015b49a038a3955e51. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZMER2296232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de768998274c6fbc77dda3fc18a98fe2fc45f0fff761e9e5492519ce98b9f1f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZMER2296234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefebd17e44d84b257f2df574340475908800ae0d90dca0d02371ea87e489ecf6. 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/QZMER2296236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd36c072fa3ece1e821a7e80d13ed649c25a7581a1d419ec3aa4fc59205a85da. 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/QZFZ22394475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e2a5abd53ca1ad82d32eb53e0236bcbe6ea3582b3cd730f7fd5e8528140c88. 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/QZES62307478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe108279c01fd0b69a7b0fc34a7de70dad68bc11ccc6b52b4bd02bcd81d5d6f. 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/QZK6N2373438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8138cc0ed08f6b67ceb9fddb0fccde3952c7d40ff80cb848d84a32c19ba9d18. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZTB32385364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f09954ddccfa56848b0a99d0fc126ab5cc82bfa5098b6ec5302871877d9d8f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB32385369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca054b4fd5968973429771556aa982f53e4dd80e536f155f98b82370539b455. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6M2427987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6f3177502ccbf4881f79a4cdb741cbcf719c6c31770072bedb1ccac82977ac. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTB52449360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016495bbcb68c037e6b731f93bda75f9e8c421c1b3327cfb8ee9d7e911ea83c9. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZFZ22316844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20ef7b4653bae47e9f6229e6d7cebfc2e0b673870670a355be8c32a032306e2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNWX2245868.