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 0xd27e837b991a2d135b8ec916f93f76aae8f9e75362ee9f6ecc92964557e93d26. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7566138a-2a6e-4d51-bab8-e7f35b5c5a78.json and https://artists.proofprofile.net/proofs/artist/7566138a-2a6e-4d51-bab8-e7f35b5c5a78.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 0x5f1363c1a782ae6fcab66fadc76202e05880d68895c4bb700b0558a6d05491e0. 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/GX4Y82100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59146cae493f0e0ebcfaffa26c899073c0949da4c9dd000fda764c589cd10a85. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:24:25Z), 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/CA5KR2202384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8c375b528aa9a35827afbcb93eb6c083fd95459a16358e4d58326912ae3a29. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/CA5KR2237547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e03eb0f9934e2a795f7c49baeee10d250fa477e448009243476b5233aeb935b. 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/CA5KR2237548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95dfc7e6bd8004b45790f32fd3f7bb8e2fb5694c1ac9dee24e5bb89205abf81. 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/CA5KR2237549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2964992d31ced3ca5685c0584ba97b5b30f8c66ca1315e89835f86d05740633. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/CA5KR2237550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2138d56ecf03f5e3811df1175f4a107efa2a1652afe158ac68cbc4126b1afb1f. 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/CA5KR2237551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19010a1942a1e4a6940c3488df4e439049997c39cfc81e26b3f18e61d0ce3c7e. 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/QZMHN2472254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82ea65298d36bad5a66785196c303e43f3268edad26bd1a45e79dcc8ed5085e. 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/CA5KR2469735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e32c0b78ab0f06df548d914b37799da538d7b5f314d480ed34eb9cd7863b98. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:48:54Z), 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/QZMHL2058109.