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 0xc6c8da1e7d8920b7dc6f86ef9621f37774f56c1ac0825a4543b8024956a938a5. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa4ab734-6b87-4341-924e-fdfc66850942.json and https://artists.proofprofile.net/proofs/artist/fa4ab734-6b87-4341-924e-fdfc66850942.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 0x9f8d1e5d3b3fed2d46ee804fa394172a0e48bbbc09ef5f7d6f0033403253232d. 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/UK6821634158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197a1b77fd44e8b28fcf8030715dabdf216404e55051935933c79eb25bb00f21. 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/UK6821634159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6715e7ba08d633c3171c382eeade119e97bbe4cd02145d072ef921879b85950. 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/UK6821634160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c507ad1c5fb6be67398074e5fd694bc277273b5b83f1f3ec2583b388331e52f. 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/UK6821634169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac168d854d9548f55d93ed17d4131f6c00d705a1b25d5063dec0c0c2e0bbd1aa. 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/UK6821634175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15216a26e54cd4e820dcd86cc9917e6668be80957a253bdabecae7a1db708c9. 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/UK6821634182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a80695111cb23f3795f18dde9ded5803de57e457cbc0142ee7f9116645975a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/UK6821634190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c3e81f7628cd69c4d4666f410f33d39a9f250426abb8e6c8d1be492cf44091. 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/UK6821634193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916b1dd23c007ffd3e23d7594bd7adb37fbe0e674f99cd82dbefc2fff4527610. 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/UK6821653552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604d35d52ee5ba1bfef3a4ccb694af1e1a9895227e8f5fdae01950b5a0e1e40b. 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/UK6821653555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb88dbd5ea4a3af98992f1d1a9e729c8a19bd20bdd1a02de03f77e427ad5c1a4. 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/UK6821653556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6a9b6da972afe181585dc56b8e8f82b2c5ce02d2254c6a3b7f613828870766. 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/UK6821653557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0de3b4a67181f00d42cf0a86adcfbe0e9960a5b26310ccfa5dafa83a1a6025d. 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/UK6821653564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012008481f79a0b2318904f756f7fe6696e6358a3733def5f5b130b64953d988. 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/UK6821653567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88453ed4d826f587dcc175ae2d946f25444f491835591d4dc4a338c8e6c9194. 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/UK6821653578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7561a274b08613bb521a1f06e6e86139e401f8cf55d7b051176aa4a753c6271. 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/UK6821653579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e12f65fa3e26f50bec5e06af5fc0d6a00db1c25d9ff8414ab342d96fe03247. 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/UK6821653583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47dd3bd620364cd941bd0f4cbc9934b8bbd7244a3601011f65cbb5ddf19e50b. 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/UK6821653588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd0828f931afdb3d2ee375f947bf2108b1668c4527adde8d34be38f3d0eb3f5. 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/UK6821653589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979e40a7fbd38f5e9497d2acbb1c8ea392270351777fcaaadc9e6168d4d6de10. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCACJ1502675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf0a2313ccdf8604a14ce1cbca173d50a018f3861f5f5c4b0fb62d929e8386f. 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/DEVF12000595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1df85c0359298a5df59cdf4880f8b0b09b99d3f286e924fbd71f648fe11b4cc. 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/DEVF11900551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbfabf8f969ee1a787994cbbf21db254339aa61b22c9a1a68126e2c8eeb7a73. 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/DEVF12000600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc036fe4ebf2911413ca35b35f738ae842638d42472b6210b13be1cda433992c2. 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/QZDA71967690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5a4ec0ce9d6ac159a7b72c2cef44ca495888ab7c987d567869f16458aa45f6. 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/NLRD51632008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4256b1dfb1a2cf3dc81665fe125373d2d3e3f7d9dc404f7b06a40906a803c35c. 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/DEVF12000601.
Rooftops Horizon Compilation, Vol. 4 (Part 1)