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 0xa03833ca42f86146fe80aa3531a0ac48b60c28047e86fea2f3646f6d9e4bd91d. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3cee7608-ca46-4685-944a-b3b4c6efe316.json and https://artists.proofprofile.net/proofs/artist/3cee7608-ca46-4685-944a-b3b4c6efe316.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 0xf0340e3fce26cf2552b4bfbb967ac59eab9545f1ac295b1a08c57c3289360752. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACU1651755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c88131a4d36262a054e1f48392b2fa2cfb6b9f271b7c1fdb2dc2e7cb2eeee66. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACU1651758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f72d85584f87429901f92aa521ac1630670be90f127ca6d8d54a6a301bd88f3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACU1651760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3b784515164138315510f68b5a60d4103857c0e33f0c9010ba14d81df4b8a4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACU1651762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46d12534c78721f4de1afbfa07c0d9b19cf635f1f949f64691d197168fd824a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACU1651768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80f925f70b04d8880a4168faa5967ca23707817d3f57f0375ab65a3676c1e47. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACU1651779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27c5a94544ab8afefef525d6094569846dff508a8e5bdab73896b6ef5fa9ce9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCACU1651781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ba572905cfd856f966098e804df7bae73d9bc7f401a478869c047e1daf4c1c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACU1651785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225f42815ea81f780bde558b927dc34a1abb31653878e8c2aa8a9654753a6136. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCACU1651787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6314b1d3d8955431d8e3efcde5a1e4b4a4f9a8030027d53dec14a08f41b2844. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACU1651789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5dc9f2d03f6fabce9d38fefe8eb90f2e2d89fe4870c83ccad8c36ed6b3f7233. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ9Y21763559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f138ff79431a6598001d927bdf47a0f3eeabaca7788465320435a83d2fa149. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZ9Y21763560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1534d6c7c666436a0875cc63afab8ef6444fca445fca85dcad58e41e73a4b6d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZ9Y21763561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50074771425f7e81b77068e175465197a26419bf136e082eb452bdecdc209a5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFYZ1996782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49982000254a4f7518a4cc7dd97e12627f1be708a685160bd88dcf567330ac06. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZFYZ1996784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef4cc9a095762c39f7bee3e6b6998404fdf3f832567c846b2fffc780275748b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYZ1996786.