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 0x180ae64300f5b298309bcce91b83cac67975111336acb9c3c84d63b97e1c5c4e. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0c86fdb-affb-4058-a99c-6486f3f6b15e.json and https://artists.proofprofile.net/proofs/artist/f0c86fdb-affb-4058-a99c-6486f3f6b15e.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 0x49ecf9372166a4d1efb16cab363c084fecfe53bb388d17111c278d4faa88a29d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T05:02:31Z), 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/QZANL1764397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2178a22efad886b787f429cd8af5e3e9f7c0da1fe45c7d9ec7ea31f9a61b447. 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/QZANL1764398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447dadf505c97c4b3c8c3e9febbb47d8947336be4e5b13911634b7dd124c28fb. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZANL1764405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c756b768815585061f95c16ba8fd5cc0ca9c333c8084bb8e1b0711f9f9131a. 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/QZANL1768971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe351051547a616327eaeb408cfee35fc0d580e8661caaf63011f8723429e602e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:49:09Z), 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/QZANL1768974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98df29f2c25eb4082e9d214d02847ccde920bac7dbdd89af63b008c4a707b47e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZANL1768975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46a854b8a1daac15396db1db3306ec2bf88d2632561e5c1e750878b24f2ee9a. 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/QZANL1773353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3daa1eadb61b44e3cc51b2b8854fd95512467a6ddd198b74ec1994643891e6f3. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:02:26Z), 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/QZANL1773354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbb279f23e73a807ee2528f5a74ac33891bd0dbeef4e9c1225ceb47297732c7. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZANL1773355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b56f775dd47d33747d99a409697ab2f92dd04554d235f33f7c670c163d225c. 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/QM2PV1810156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41fd6d286e50d30695c12ad82b9b6a441b44dc0bf78b4d66ca7e31e8ea18c80. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZFZ42057215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513570ae03311452784a428ab4a2fb1029ec094dc6b567f21af84d8927568966. 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/QZHN72026251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa202d7dfa83637c63a6f69cbe96105acbc3ce8127396ce464a000f507784294f. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN72060077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7380d7cb5eb8b94be62b55a48c1094d5291b269a343d013e610892e3c670bc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6P2377448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c12618938a6efbedd3a466b57002af5b0b0a74040999994d9fea2e2b4e381ba. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZK6Q2484211.