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 0x5fddf59d3c76a45e35bee70993fc95a51c17a7859680335bcf3cccb41bf0ee5b. 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/b0664030-56b9-4c82-9eef-2557978a77b9.json and https://artists.proofprofile.net/proofs/artist/b0664030-56b9-4c82-9eef-2557978a77b9.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 0x4d5b141f1f28b8e0d43bd019d4f1e1067e175d5c898a2f7b75099943ff351805. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZHZ52086645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e8bbda81609e70d9861746fb3555580bbbe6f0c55365c3a8ccef9e045e103c. 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/BX4AA2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2818a84805a4488dc2802a72180bae1e9fd76b8245a262e26e194b1c1001fafb. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/BCSG12100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0e38d14c43e67b71fb35a4573d776d0f3c8327237e24d238e0fdbc4b909369. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCSG12200045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3210869ccc9cb9b0a199d90a9afcd730684de39990210a444cf4dd039baf6f. 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/BCSG12200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571da21512c72dfa6b2e85abadcc3d79ac4dd7c3deaccd50413b978b2fcb6522. 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/BCSG12300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8358ef3cb489edff563e84187e4ab9452d6eefc631ba026888f4a5de2c190a7a. 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/BCSG12400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4168ff879f5216c524e2114158f2e74ba49fbf388725bbd47b2aa41e8ab0de. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/BRSG12500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c4c76a977b41dcbd762aa9988a4d8d2674c4c246893fb4b9517177ed7fc508. 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/BCSG12200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f65942ebf564f6135d4a71eeea57957465e3233fcf4c157d38fb2381b144ce. 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/BCSG12300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e96fe9dc9dbe647e1d37765705b3189e932e9ae321cfaef8974de7ad955055. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QZYFZ2462010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e96fe9dc9dbe647e1d37765705b3189e932e9ae321cfaef8974de7ad955055. 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/QZYFZ2462010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdc7ea780106a4016ee1c30c4535266b7cad3775f7aea9d0a0ccb253e12ef88. 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/BRSG12500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4307b929c2d65104463763dca979c459bac44f5ee125aed7a8f0ead3cc819b. 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/BCSG12400022.