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 0x6c97569be98d5b823766270e0d3697f56ae8b8478a290720719301d34fb662e7. 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/f66d2014-5b2d-4c66-ba16-49c13d35d814.json and https://artists.proofprofile.net/proofs/artist/f66d2014-5b2d-4c66-ba16-49c13d35d814.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 0x9a08907999d809902f16203f5b8dd82525ba2fe49b2f00679a33ffa9bea7bb0e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SEYOK2005908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575ca8c2b32a460a629ae3f2ae2202a39edb257c95215f77dbefde4e018b434c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FIRCL2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875db09aee84f51ce09cb8079613607aaf35661def750aab3cda95bac6ecd746. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FIRCL2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f5d0b0fb0b68d12e82d4303a3666f7dff88addb306f81d48dae21f2c4d9a25. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FIFRC2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0f8188e85a5897946a6bbb99c5c10686bc1049dbb2c4768b8dcbd60b0ab722. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FIRCL2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ad2a8764b98c008bef89eda1b65fb2cc03be594d3ddd5be6c1cf03b19fbc7f. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/FIRCL2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575ca8c2b32a460a629ae3f2ae2202a39edb257c95215f77dbefde4e018b434c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FIRCL2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f5d0b0fb0b68d12e82d4303a3666f7dff88addb306f81d48dae21f2c4d9a25. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FIFRC2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafc5ed1e704ad1d55b6bb2471ce57ac4c32c6c4e7007a0e01493704f7ba5ea0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FIHC82300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73929051e104bca1673f0c8452746327a10dd65fa8d4d15b6e7b36198c12a64a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FIHC82300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9533aa2c2bd3354a82655f327e109b7bbf504b8e5e84b0b635ee54a2eb957c. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/FIHC82300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73638a4db1901ae638886e87cc0c3da9b8ec347fba2669ce402abb845973c7e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FIRCL2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6102f46bf64d879fc23df760a81157ea3d69d2eccb93a47fb5b74da2368b3c2e. Chain 2 (Bitcoin): anchored in block 957534 (2026-07-11T07:10:38Z), 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/FIU3S2400002.