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 0x55ecb1404c8fef5f1cc382538171cc59bc14f370c4748a0f67888ccfae1fd2f5. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/711ec4b6-ceb3-4eb2-9092-39226f13ce28.json and https://artists.proofprofile.net/proofs/artist/711ec4b6-ceb3-4eb2-9092-39226f13ce28.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 0xb31bca89955251a5889e7050c9a4df9288c78bff3d4c869fa0b1eef298a46757. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKG732410480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b443cc57e8e89d3278052aa64c02712018cc8ce003d88a0917429d8f9e8c68. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKC992425988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c30210b1be30dece9bb25a5cb5b0a8ef1393da4ab22a7798be35b285e52dd3. 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/HKC992425712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0ec876f4a98c9e3e862b772a6417432302229541e07a289354446e34672747. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZZ972372748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ffdc0ba485270e60011b86860b882b5534b7a52c411a864ac8c2e8c0c354684. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG732313355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12abdbae07d5b3b49f27f52f7d53630dd1abf205b224d18869f531b770043d7. 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/HKG732303924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79948502fe0037d91d4c4272a9fa7da12dc467ff58dca91c3bb8b5e3026e54f5. 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/HKG732264166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3de035a7f6baebd261c2eb005864bd7ab4eeebd04de252d4c2f52b1e17e936. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732256134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ac1487ccda0c481d285542c50def0c508aba0a46f6a3936ad9c4977f3ee16c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKG731794650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e364e988bdab8d3a4b89b6dd4ba62f481c1337aa6f0951aaabd9aa748443c8. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/HKG731761897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2abcb2462418a0ea3dd0234f04f6e77b213b4c4f4a6ec2005654f98c20067ac. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKG731787731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa799f0e410fea3a1a9a1aeff53dcb6d2e65e00460d187fa3f45b6580fed48d1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWDL72200398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ad866f3162d61b0fff68e8a683092bd6fec97e4f90206e28dd44911dd50ae0. 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/TWDL72108390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0913b06e86e8ffab0b95ceeba4ea218e0f76f02493f757c023325c6bd255abf3. 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/TWDL72202031.