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 0xda6fbfe446ec9034f710a0c95eddc64ed1da77b5037971bf776889381ee7aa7b. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad198f4c-594b-468d-98dd-de1f35b4f00a.json and https://artists.proofprofile.net/proofs/artist/ad198f4c-594b-468d-98dd-de1f35b4f00a.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 0x5dda2ffc16aa4250eaa6c942ad97b91ae889e00185b6d8312d8c0cb0d77a3bb6. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/HUAC60502597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7286a3f211348ed3e9c776bf444e311cf4b82fd0ea38719038c2cdbc45850294. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/HUAC60502598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bca998ecf9539fdef85f68626a8ff8b9e389b9047f670d901e2c9737878cc7d. 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/HUAC60502599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fff6bd2912b5e183f5a97b8855cb6c9088e5f5f55ac141ea148170a3c4343f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/HUAC60502600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff27af630da9bbdde1faacf9514ce23cca009db6ed5048f01b2db17cff0864f. 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/HUAC60502601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a14f0c766fedcfb1759d9cb2db5c237d39cbb1e00a1fc2e93c0ebd127e2a74. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/HUAC60502602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797a4a301480a53630d0caf9f87f4be75808034b9cfc3b98b77419ab26a33633. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/HUAC60502603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320e9c3363e018d7005ab04cbf6c7d20e7242ca5e224d5215f5b5e190bac0b4d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/HUAC60502604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ff523d8952ccf0a389d2791adca36ae05dc55046f92bdd918573eabf1b0993. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/HUAC60502605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3065ef3828dd1a9d7ecf625b6fda68d9c0ee51e62fe56a10d7f7dcb4fb71a69. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/HUAC60502606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131291b345de6f47f16cc3b7ff4ef855037f329cfefbdd2e97adf978b0ddb7e3. 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/HUAC60502607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1038ad8c9ce3ce0f2a68e1077aecab1b7bbb8d17f8268c1fd54a8cacbd6b166. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/HUAC60502608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748f848276ea18cd78f5f6e3619a2b142d08271e96ca9a2a826b79e4d973f6ea. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/HUAC60502610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c6267aefdbc684f896c1954f2f07abba9dc16296c4547d7b2a424f030384fe. 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/HUAC60502613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb830887d6edefe281668fe444fc6547d80a6f30a08f443ed7a6a9daa4858462. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/HUAC60502615.