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 0x3c448a69edf27683a1c2aa6392334613f3322cecbf805eed84215fd740ce5767. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4290ea0e-2763-457b-a363-e2c20668c2f9.json and https://artists.proofprofile.net/proofs/artist/4290ea0e-2763-457b-a363-e2c20668c2f9.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 0x8528a6d2a69df7bdc9ff078c4b00b38c0d69d6c8d00c8664f1b7dd8635f9362c. 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/USL4R2381765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8332b743b51c3cd99b6675f1739aba85ec9a0b0febe5fa6f8b8f79359f36c6c2. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USX9P2318327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3808b1558ba4f121b3560371cdd244b9d02bcb0bb8d9952a4ce9e434aaef68. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USY282319986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd1bbd62c954dbf5320293386f6ada954af24b7ed97aeee341a944c633d7712. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USCGH2499010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081d2f979cdd762b628eeefa3874b02f170c82fb5f0d31f844cc0840b6101307. 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/USCGH2491134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3393b42f5caa3e11b201c684cce0545c25625d3dd27c3eed016e515be1ae1206. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USDY42402753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd321ac870311dc79908b83b67d3d6918ac181fa49791f2805dd35586c4a14700. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USDY42402781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55a4df1959647903501abbe20e8e76b83967ddc0e5bbff4d9ae60b4b442b1ae. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USDY42454971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7a0b94d47163f09ba18203f05bebabd6ba50964c16305ad9f45c64d17419a6. 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/USHM22414082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576fccd8d59c7626c59ca73bb2757b614682d7fa4e1d16063a730924386499f2. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/USHM22480361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01377bfb9abe36b2cb0bed1d9a495ba81142e280ee61aa81fc5f9b0ed89ad67. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM82466280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2ab4e11f866d90fd49a30b516e02c0dd42442767a47e4f67d6e89eb83c8c21. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/USL4R2400293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf98857ce98b01a1378d0aee1e0fbce68f3e5f0c3e33d830f43f9236922788a. 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/USHM92513100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55ca79094e84ee2a25f67443ca3ae73993d90758301a9f0fbb0b5373daddccb. 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/USHM92570000.