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 0xcc31407dfde1fc734425d770b90d58ff4a2c9cb1382dcf97a396a648c7e9bc40. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32d06f06-a21b-47e8-8dea-5266066000b4.json and https://artists.proofprofile.net/proofs/artist/32d06f06-a21b-47e8-8dea-5266066000b4.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 0x141dce811e5f1b16cd6f1bf2516bf453b8c73f2e2a322b5bff8d7dc0f8645431. 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/QMDA61882019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74709bd37bda3003b99e897a87faf19c7199c84177206200c800cb24a22a9d7. 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/QMDA61882020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0a0721e1f6a5fd6a8de1cf5d1739363f29c08123e494431c6c54a3472e2616. 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/QMDA61882021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ec9342aecb58e1d5bf4a6561e2c67d94b150194f8a04321bf029f58a23725e. 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/QMDA61882022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99fc8ea19043debab1e39c683fe993521a60e47561f2c8a0d54ba7a26a8f978. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QMDA61882023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2913b6506c509ac67affedc94eca99925441f725b8220e586d425337c8bc61f1. 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/QMDA61882024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c91665a8e9097cf01b816806aa0245e6469f435801d4b70658145fab8652a4. 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/QMDA61882026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c8571dd9853b755b9c410a63d96b5f65f1bc98c4dc6eccba8946cd9cf345dd. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QMDA61882027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b8406b8c366b13b3fe92aa212a412a2b9b096db0788ef7a19ff5b131ec4bd7. 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/QMDA61882031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd3bdee483b335b4d7d4cece3083e2ea42be33898df7e712bac4abe27035f2a. 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/QMDA61881998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8ea04b87cc90ef9a630ee832af2dc23630c6ff622235293b2f5b9b99be0a94. 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/QMDA61882000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec84b09f06b2e4be100645c3c11246c86458bc8b2dde66b3580036cd367b5da3. 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/QMDA61881999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3315467d5676f84b7ae6fcb22fed42f427a227e0b2d3ebf597554789909b8b8. 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/QMDA61882001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e1bdf1b61da46a1ac9b6bf8ebf478f8e25ac40f931a75989ec06bab000c70c. 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/QMDA61882012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1b7250500a1594df89808cf030c9c7e3137cb7468e600a46382d9a762f9ac5. 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/QMDA61882003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64713dc23bfded8930ed92185b7de2f7438eb4d607391d960d86d21076aed7a4. 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/QMDA61882004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba5bc766327890c7f1cc11e76ba5e405c8ffb57addec41a20fb27972a4e7c49. 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/QMDA61882005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe089eb90455a27b35d19f6fcb9b432d0b251cea1e739637a234324a8b972073. 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/USA2P2105561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5534bd014598e9aa44e03ec5e2da5fdac8e54bc978006ef08f6309b136fd7d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USA2P2022243.