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 0xf85ca13dfcb16de44b8941b9fd9192ac3c083af14b45f23089e588d266a43bd7. 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/f3851cec-121b-457d-ae27-0398c9d1ebf8.json and https://artists.proofprofile.net/proofs/artist/f3851cec-121b-457d-ae27-0398c9d1ebf8.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 0x46b9172ed81147d878d782b9b2bae5d85325375faa3c958644ff9b3fcb32e091. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZK6F2328293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd4085539524dc5134a82a32195f932ade426c8d86aa42da2df6b607b51902f. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/QZWFM2435621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31092c68be34bc678409174a3830c1a89547755801b3fccc085af004982f1b5a. 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/QZWFT2470132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248769e288ccec6777cb1c1d7beb1dda64403c70bba87c69fe0d2dae1c03effd. 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/QZWFT2470175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3aca4fe9a0c4e3be7dadf6fe5580fc3cd253e76d0267a683b208ed905eab390. 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/QZZ7S2451863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958991eaec1a928ef547e547a6b1d41a033f69684091d6e9c799b9c2d7d55ab7. 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/QZWFT2462787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb1fb841f39ab4d203de47104a178c9db61b4f94f38f1f4b280b5ea7a2cb7e6. 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/QZWFM2435608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31092c68be34bc678409174a3830c1a89547755801b3fccc085af004982f1b5a. 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/QZWFT2470132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bd4d6a3d19571f82c68b0fbc550c360008e126765d55b378eeda99559d92fb. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZZ782493202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3d38823f87a6777560b676b450ef506fa12d982d8da3ae6ed5bcac3d8efa7a. 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/QZZ782493203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eeac3b21fd359cb0f6a9cb18df1823950d1f1891433ddff9cae003fab5aa029. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFM2435534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd250f8985dfd135e58a8e6eda7adfae8567415e37f8ba01f1fd6af10b0422754. 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/QZWFM2439529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819c65164c916254e9affbc8bc0f77bdebc64e763dbba37a2a6890245a70430b. 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/QZZ782493205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e3566f1c15929efe0d4d137ada54ccf0363e61d3d1128db9ff801e6541d6b7. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZWFM2433438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b742aba80730b3dd339372731662364a27293ebcca7e51867bfa580d97ad40d. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZDA72558932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc212bebcaee61c11c61ee768602c72296385b1847761770179cf02d09b8ea978. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QZDA72558933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ff03f9aa2f0fbdb475bd59a95ad6b8b0285e1d6fb86c068281c0aaa08f72e8. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZES92503913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e69b66e4c8754b53251166e2f1305712ed4bf31e2bef29f711473f9a88ed4cf. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZES92503915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccae5bf1d0db7003f3747e8e6de10f0dc34ac70e6909b69c30085eeeb33dac39. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZES92503916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb99652344a628699bfb768bdf0add42cde8ebb48d78797d1a1cd977b862bd85. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZHN72552815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1772ca36da77a24e1c4bf8827137d2b2818bb33c35ff1bbd6f0b41bc888cc732. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZK6H2557067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583dd3c3fd6ef8cec7e4f5060d4e2052245921a61941c558ee079707323eca67. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZK6H2560585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0354310292df7ba1cfa900a66874c4ac7a44e011c4f4ec5fac8d4cbf846d3298. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QT3F42554431.