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 0xe555d3557f7f083abc79d29274ade037c70a4602a9a543c897d2ce21f9356cbb. 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/1c5e6915-bf7b-4cb5-88cc-24ba3a161a68.json and https://artists.proofprofile.net/proofs/artist/1c5e6915-bf7b-4cb5-88cc-24ba3a161a68.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 0xb1ee0b2d6ff92bd388416e8f2c9c223c880d744d3a3d67dd01971a2d202d3ccc. 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/FRPIN2300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e21cf8412ce40aa0de698056fb86e8bdf5e5d39e5be0194128b9830a5bc3220. 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/FRPIN2300260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c921e84fb74ed744973d9501342b2586e008db10864d4a2b8b833703e54c20. 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/FRPIN2300270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042041ea286954d983d3988a33ace74b7e826b1ddae85717c92c1aa86b294380. 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/FRPIN2300280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0aa192947d5c19d542829c6c5c9af7d7c6198defd62427b6638828ea3d11ed1. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/FRPIN2300290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e3eec489abd4f935207b65ed7a414a7e212f9b1a11c003b2b143d0ea756e3f. 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/FRPIN2300300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a5d261652bb87bd4e8b4c58d970095efffb9d7d9bcfcedd072b6c411144090. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FRPIN2300320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434801b4bb5b42ccc0cb9fef32b5c854153c733c0e711d509d7373b8531eea58. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRPIN2300330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd685ca4abb6e313556d0458a48d3a220e74b8ef2292beea2da49f75c7c6ec7e9. 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/FRPIN2400300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c921e84fb74ed744973d9501342b2586e008db10864d4a2b8b833703e54c20. 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/FRPIN2300270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cfdd216dd728743b5fc6391877c626d6dae46fcf3febff75ac2de884b4a7b3. 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/FRPIN2000320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52aeb08dca2919b75125c94b1110986d20e3218f7ec7f75bd1c88e16fc4f2333. 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/FRR641900578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb67c96425580f0856228a56902ac4a9838c15dc213494905fa3cf74bf3f9663. 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/FRR641900640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ee4d7886d2665e4ec9636e585961569db3590b15d633e1824e83301b46dcc7. 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/FRR641900641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c7defb01ba135a29264d3ff828a084d91b8f84e4e8233bc71c4138c2a89317. 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/FRR641900642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe528ec71d7e8f691d12d3e66218dee977459687cd77763751a6889e57ab07644. 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/FRR641900643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d45ffa4c0f48a98ce993847a4b1761cf093c4a27936a9291617a0ca18130b7. 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/FRR641900644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf64d43e437045d1c34462877380f7a4f4b98ddfca1fa961815ceb241106437. 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/FRR641900645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b77d271c50293177eb5e459f8a00cfcc1be3947cc59dbb3b96eb9bd32a4a8a. 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/FRR641900646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d8b66594e454fc26867d2972fb23cfc7cdd3bec15ce5ce4188dc5aa430f7c5. 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/FRR641900647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52aeb08dca2919b75125c94b1110986d20e3218f7ec7f75bd1c88e16fc4f2333. 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/FRR641900578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5760dec60c36f1ab950969b5671b217055c3bc6ecd79b8e27c08818ccbb70ce. 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/FRR641900648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a5074deedf8f70c4dd5aee5ce75b3e03c533c9d59428198f3bca21a21f9b7d. 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/FRR641900776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a9575fb8da1a5bc644a327f91051c02106d210160d40861b4650a4e660e047. 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/FRR641900650.