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 0xd727fc9265b47f5a98a92842fba58e7a09e34cd2f9e2083d87fe9345676d9b33. 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/bc9741b3-66cc-477d-bbb5-59c4f3c02bbb.json and https://artists.proofprofile.net/proofs/artist/bc9741b3-66cc-477d-bbb5-59c4f3c02bbb.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 0xaca7daeac040ebfc75ab33e449c57d298df86c7516f9e479b31604f6c8bb3a71. 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/QMDA71867767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6861f4ad4d7b1f345ad6d79181571e1594b4e6969664bffcb40107cf8e5cc3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USZBG1201142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ba988b8bd32a1ecf2bc27cfac60288b93f4a8fee3d95ed923ab7af995975d8. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/US3DF1435150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78405907dc715ad184df31cac20d356e52eada2e8c9a62b918ff37a8d491512e. 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/US3DF1435151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353928c5a0fc0e95f1e4ae1cf198de4b8ace73438c29c518dce4ff9758d27fbb. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:06:30Z), 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/US3DF1435153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a1b2a9970d2894498a3b8a4bbbc52b10d04742ff65780361b3ec738fb46bc3. 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/US3DF1435155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37bea3ba4884264f3356dd4d1e6b09ac9a1a110069ac0a94485f65ae4c155089. 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/US3DF1435158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e35fe651ca14922fe2eb520bfdd09710b0253773c2c33aef7784a951a724d80. 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/US3DF1435159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd0ef31c98a6c6ce36a19f5c618e7b7b355ee78970e68b423dc3129a6454db5. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/US3DF1435161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cc7f907906e5bda0cc9b66a5c04e6b2d9e9b2499472328cb671f60eda49058. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/US3DF1435162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4585dc6e3d3367a134ccd4852011c8698f26c1fb6412818a3a7b40e9dc3ced2a. Chain 2 (Bitcoin): anchored in block 957697 (2026-07-12T11:22:18Z), 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/QM6DC1537712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09fea45687ffdd17bb6369534bdf09591e3f9e44748f9656b4f5bbc26668039. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QM6DC1537715.
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