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 0x44e24427ac2b2ebd481a97e3da5dd6bdd250d0d35438dfc52729b3d617283e37. 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/b2b92245-a608-409c-99fd-93e59387ee87.json and https://artists.proofprofile.net/proofs/artist/b2b92245-a608-409c-99fd-93e59387ee87.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 0x609b465548e6e4d500471a1bd0d8fcb2041b081c59636eb62ab62465d8df6f18. 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/MXUM62300248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfc2a1d6b07026ea18370eb0beaa20edd4ba23037d32421c269bea2062e472c. 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/QZDQH2384711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e4ede277e269f8e4c3865b5011e46554eca82c27a9bd5a00fa3c7cf95f0e26. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZDQH2350425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d27199fc0f935fb00866eb9052c4b8d86b75016b880831039e2488b58d26bf. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDQH2350426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0467d04ac270848318868a0f2ea1f80ecd1dc3e79eaaf236c5b37beb65c82699. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDQH2158424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1f9ef497db887b856f18d8049273e95f7c5df9d2defc11ca93da432d2fe0e6. 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/US3DF2421618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97bd2d7184b4e70918778a565accf10185cae89cb0c8895bc54b23f76b77dd0. 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/USANG2364195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af0dfa7703729553d096a38b8a5092618050fe6856a174fa0cf715f3349d3e3. 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/QM3DF2309708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045c8d3c2570345b59cd1206f658797ee5fe99d0a90cb96a2911a7379911fab7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QMANG2239466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f2474e3a3c90671c535ceb3345cab2a068b3925c9b0f4c4a74dd4d5df146c3. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QMANG2219203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da7999cc1907bbc5b2ae31e90f753cf5ddaf2a03de84c4fdea6a823d8f15366. 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/QM3DF2285463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c73160ed5269222eb6b1694c301050903972a263c83f2ca84573e8fed4fc4fd. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZDQH2377688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295c57acc19241c405f08aaca472e10cb1bc224359009e46dc0374ca0f53a188. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QM3DF2269635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8be5b64a1b798dad1b2a934b2af2d77cdfa9baf6b91004782c13512157802bf. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM3DF2264591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23adcb9f45d02caf060cfa05a5cc979ab3eec8e2168f45eb427ea692de10773. 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/QM3DF2256264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17b91928da5c2500a3dd9b980a0eb75f6ed488fd81fc1993f3c9f0c0f83ff83. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZDQH2351939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b43e94e79ced514bcdad06070abd03dd2f0e58e626008d49bcef60dd52e564. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZDQH2259634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab33e038d04d7c3ae46049b8f3f2cc5da95de2d9fe4e3cc9cf45a5cd524bcaf. 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/QZDQH2256636.