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 0x859f26cf1ef57c54093241072a30678571c764a99c6763ece3fc3455fffcc329. 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/461b3fda-aba2-4e53-ac05-e9cbebec1256.json and https://artists.proofprofile.net/proofs/artist/461b3fda-aba2-4e53-ac05-e9cbebec1256.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 0xc370e1749d07984c1edb471cdb111135db05ea4ecaa9705c76635b06a88b272e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR7U71700074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2267f33d9baa5867b757ed6a445c253540716c8ba575c7199bd571e86ad25622. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/FR7U71800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdb7d943c77a3a0cc2942e389a69efd4bd0c2351a9ef4c952d75c45aa1a5631. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FR7U71800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1de04b402b9945564d3ab06521ebe024bc911e181535ea141ac19262a0909f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FR7U71700055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2267f33d9baa5867b757ed6a445c253540716c8ba575c7199bd571e86ad25622. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/FR7U71800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffccbd4fc92d414da7c75ce3535569a22be3891d6fd4e389a464b891ab00ef30. Chain 2 (Bitcoin): anchored in block 958556 (2026-07-18T13:21:06Z), 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/FR7U71900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e4e3441e86d909cacb186e58858f080b8ec24ad83021f8944c5be53fd4305d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR7U71900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022fd0bbce7a4f6c0add24c94f71fbae3a20cbf58d795ab4c16090268df6ebfc. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/FR7U71900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e864bf01343d75031473b32982cd12790ec931e6b7dee5e50efa8799432a7ee. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/FR7U71900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87cd5bfa4a255f1f3e7f3708918ee941d52a89b9ca7df221f0f7b7d0aad4067. 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/FR7U71900028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e4e3441e86d909cacb186e58858f080b8ec24ad83021f8944c5be53fd4305d. 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/FR7U71900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae50cac92149ac192f24631a4c024d54302d5bc6d4501730bccc7005367fe39f. 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/FR9W12232184.