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 0x08c7c9a77f6edfdc5a77ada4becc07d73b1b24da75414de54392a3809c6ee3ba. 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/3a657e66-facb-4709-8286-84cb0f4cb804.json and https://artists.proofprofile.net/proofs/artist/3a657e66-facb-4709-8286-84cb0f4cb804.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 0x14b0edcb0367123b54ba23bb9915530cd8d8c8afa001a2963c994f65b4459b41. 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/PLM402309008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3d9fa8b643721849368bd5f16072152b8ef8c7e4b98566447149d99b37f665. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/PLM402309003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5522b9e56e9ae2a504ca77db1ed3f79c38acfc9d3ea314fe70539f55a5e60b. 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/PLM402309002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2880e5fa1c30703762b587451f4af5889c95cfa5d657845dee5be54075709085. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PLM402309001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a94783547b825fa969cc9198ebc2a0736c1212fe3f9afb4eff5d80831f2558. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/PLT611940008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd0f523ce5f1c2e3ae6a3eaa5369f1656407988e9ae273545c6dbab443e72ca. 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/PLS282200193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7bd510e567be5d3d807e6cecefaad52e8e095512292a8dfec641266abc6923. 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/PLC062410292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed52f21d66fba642d1595842c5564c934a32fc5008e2b5ff2cc012b04bec8175. 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/PLC062404581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe74f2b868e557a9f5154d3488f69fd95aaa74e8b523004875f0279a2a43a7e4. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/PLC062398656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af926c42b5701cce71c3dfd7f9716d8fd5fbc75f8efa838e84b0bdc137ea42c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/PLM402309007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfc6ad1c971347d2460e3128cbeadd839879d08d3f63bd7b720ddf9d6f40132. 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/PLM402309006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a134e3eb3cef138ba65a8c7ee78f1625d201a46558090db2269a5491087e0d6. 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/PLM402309005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d738ac2bc6cbf8d468a531f6dd24d9706b0feeb3ab238de9abc49dc7846d22e. 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/PLM402309004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b73d4bc8cfbccdb04130ab7007b7eb4071975d5ae13300e8b7cda099d81f2fd. 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/PLS282100121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234b453bea16c191faaf931f7e5f97a71a18a46a82576d7435940e035c1220e3. 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/PLS282100116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10479bf2462460cb7476db23b40c685520f1c4f48a6daf8f26827e725885fd36. 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/PLS282100127.