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 0x6e9da195c534a787a0b207fa9e2b1f2d8b3c3236e62faee2f70685e174e4a7c8. 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/8d06c7a5-b2fb-4ef9-8b60-301ffa5ba6c1.json and https://artists.proofprofile.net/proofs/artist/8d06c7a5-b2fb-4ef9-8b60-301ffa5ba6c1.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 0xd38fd0df655fef8f7e2950a4e9ba2de6e95cf1c9af32ec071cdb5157993670d9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM24S1901176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88325f2c55cdd9446bbfe9736b0c0ab6752bc3c58df893d5bd63b2a61af6712. 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/QM24S1908195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69afe8995d9dc4360d575681d87af921d5fb88b7655a864f6549026d22c9a7ba. 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/QM24S1912346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7bdd600e5186183f03ad250ff13f0c561724f2550d4851767a5663acbeb5e6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM24S1919458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b261784be415f9d4dee89f89623ddd4d9795e8ebfbe17b32e9ea1bf69bc359a. 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/QZFZ21933971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f0a6db33b8a549a621930360c7d2171526ed655ab99a975907af5a41adba96. 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/QZHN51939384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983d5f771542a099411c4717a75aa01be7304f87327df300e61fe46cf9bd1c74. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN51939385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca66015bb46303532817b0a24914609d7d55d0ca2c7124cfb353d5221579c41. 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/QZHN51939386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5389bd9c5ea226f0f042151c48e39ff7cd786ddf314bd09b6ade5322a650639. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHN51939387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962659db428bc3d7a5d7599d4da9ac4a24d53f354dfa9d4f74ed799231baf9d4. 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/QZHN41936352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f09c4a35cd741c2a80289b96d93590b34a5b44a3ec18b66dd58eae15dedca7. 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/QZHN41944941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac665bfc68e5deb2c93f7b2cc226ee148a4962c82aaf93086ea1ecc7fb50853. 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/QZHN51939388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ed8300f90de3ee0371e1612e7e1d7c7bfbfea7188902ce80fa2ea8b2217461. 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/QZHN51939389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f2d0308d4a48ac103e0f9c4a2a067757682601505c80968df1e0509d8b6157. 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/QZHN41945743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99267c8f7ba041a4460215f4dc476d009234fddce6ad8c5b80610df2f061d0c. 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/QZHN51939390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc8b743a6ae24f2d7f9744dc553937202863bab848902a9d3c77e09817d20c2. 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/QZNWT2381374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a3a97a9f34fdc595a2c1d0e2431441879e14d4486b0ef6864421f182f440dd. 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/QZNWS2246848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf972c07e7142552422fa6c7c91e1d4d90b1851bc4d708faa548abf2d22cf511d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZFZ32051343.