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 0xba3ee2907dd5a2e10fd9002b79657c87243e02214fdcc1e9f8078b5a37dd194b. 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/5db93c7c-70d5-41de-b941-0b62de24298e.json and https://artists.proofprofile.net/proofs/artist/5db93c7c-70d5-41de-b941-0b62de24298e.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 0x29fa1f27371543e5b58ee49f597288136dfeaa335f430bb5b900d18cdeac1501. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZHN92046898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcebb39829bd526c1ecf81d64dd1350baec3d22adfa161cc9a5e6177ea523f73. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN92046899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205c11b6333ed9952c06b67b8515c56ac8e961c49ee968628c5d9261d843204a. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZHN92046904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c5446a611b9a1b773a4057ea83ad7173d1834b99f8ca3e4829fa96c69841b1. 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/QZHN92046905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e7f41fa151fa8ddc84d611622acdab1df2e0f0692b85bbd9d5dc5b6ef8ed9d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN92046906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c066d2d321a9ea4faa0548fe8bb8f88b3059be34579fc55b14d96e0ff9b9eb6. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZMEN2044005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3b99b28e454130f6395a9153922245e82794c37ecb954885ca24a2915bda6f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWS2020477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401849874a75a2d6c2d9407c28b84472a35f64e7476edfde16709000986041c1. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZNWY2184689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39806ecf285215e95816c402d8307fb2098612f8cf3c66647a508091c45f2943. 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/QZNWY2184690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b522ffcdd07baeeeb5c000561f05555e16f0e06ffa4a40f946b4a7a59091d4c. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZNWY2184691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9440a60f2c7196750028caf75de21d04464abdd76623af2344b7159d40e78c8c. 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/QZNWY2184692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6ae11eb74379aa09f60c15df205b75c0caca212a72ac79b712ffde84fbb1af. 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/QZNWY2184693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d3be32c035c91fb74425ac3a88dafe019d492033aeca104565ba21826e1c85. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNWY2184695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266ea2734cff2be6dd6f0dc4cce640f6dd5e87f7bf91737f954f9d8a9c656b81. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZNWY2184696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1120514d548fb778b97931dd224d2b508863fc56fcffd2c420ebc42d140304. 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/FXR142500028.