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 0xe217c95b376b2d265ef22f78d31252604a69ae4a8077b2205d82cef35002ddb6. 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/f1857085-6539-4fa5-9626-87c18f0daf6c.json and https://artists.proofprofile.net/proofs/artist/f1857085-6539-4fa5-9626-87c18f0daf6c.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 0x1ae9af6ceb3095edaf5cccea2c76944d4d54b79a9d71c1046a440d66bd466439. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZK6Q2221340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41e1531dbda92f02f6daa94110556847b60678f18f4376ace0da83bd05b365e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLRD52202690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcf74a23cd38ecd7643a47948706b2fc04c02c0c2b86d1d4be84b1836b3815b. 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/QZNWX2233234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1bd875e15358b38f958aebfcf3ac53117205469b00324781dabf539f638d11. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZMZ92331847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8068aac22ade6e01d92dbecc6907d47331eba7bf59ba316c517c1dbcf430733b. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZTV32492039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9773ca9ccfa7ed83d524e499d0d65d2ea8bd7940fc63b9970b1acac8e911ee7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TLVEM2475204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb02c402757e85dbed18e4de95d0caf00e135f4785a4eca3f12dbdc2fbe4eb17. 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/TLVEM2485158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245f4c94a490fd068f80058e6e99464c3ef4fbd2888ce5874fa19de8772a4f57. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QT2VB2411885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc573258786e064eda4350b923de2f6cfac3fb2cf9fe7a594089f1138d9a9cb3. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QT2VB2408096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0045bc607ee1c76a86e09f3222732806d3948d035457baa089d89de91249f297. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZZ8A2451841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ee2ed059c13f43c4b03958e822b465da65a7c0c6b998350550681755e4e6fc. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZZ8B2403365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876c72f2348ff8be57abfc675d01d2f3f8e5dcc1a57897f814ffdf63c360fa93. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZZ8B2403366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5011c4a3bd492f3749e2ccae015901170e15f6d1292851b9c2a47b4eb973722c. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZZEC2459395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc284ab1a837eb1858f242a834e0cdb06b187409ad4230d985324fb3fd1293522. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/GBRKQ2525002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cbc0ebcdb5693cab0b7af3f786c30fa2ce53e76968cc55a8dba627086cfc22. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/GBRKQ2538730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f680dce0011048132fdfd1f0c3b4a9daaa9950986235798489b441bd2beeb40. 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/QZWDD2513567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf638b7d51cf199eb72c0d9717862bbe5e30979d25b30f48f7be312c156ba4b36. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZZ8A2564026.