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 0xbcc4aeda62fdc0f99f65adc353df1cd0ecd2ee250c9a59dd11a74c447862dc67. 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/35ce284a-b4dc-4267-98a3-ba41f646e196.json and https://artists.proofprofile.net/proofs/artist/35ce284a-b4dc-4267-98a3-ba41f646e196.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 0x0b67b7b350ad14b34f4b40fbd6cc88424afc0eff04764fce4334bf4771a49869. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZPLS2255674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce56269823e498730525201a88da71b6ca6c40a7f337afff9518816d8efda346. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZDA42346795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f19f34f75e3e5d4b6950e5cdd8b955fdeae91ed08268f5ffcb390e117a2cc71. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZHN62338882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0740b2e79a8bbc6d6c3554ede4c333fc22db46c1443d1d3211e7d9e56662ba6e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZES82196562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a7295d277ce303147d5f843703dfda1c759d571816b80df4cd249bcc734abf. 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/QZFZ72114426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9be0c1bd841c2cf134f24385d414e7fd58d0d5ee5aa29b77e1fd6b3714863d0. 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/QZHN72156991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59620fa26f2d991ec9923aab4d8c84a003db53ece547c891d51922a43459f797. 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/QZHN72156998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b67b7b350ad14b34f4b40fbd6cc88424afc0eff04764fce4334bf4771a49869. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZPLS2255674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa454fe075eed359fd57b01ac32dcecd228d11b4de37e7d02095b8ac08a4e7a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN82277986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88939f01b56811558cc0ae5acf9fbf4a9801db64f69986e309d73a2700e20b2e. 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/QZNWZ2198453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a7295d277ce303147d5f843703dfda1c759d571816b80df4cd249bcc734abf. 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/QZFZ72114426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f172d3a5979859db2d39602904778421ac4d52f9328f916a71bc4ef543dea8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DGA0M2375181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5225ffa8a19f796b421b0c1b267a81e68f35a677c96e3c93f8d64da7926b05. 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/FR2X42498291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b05494f34bcfc5375433df7b54b7b42cc2ea509bff11e0af2b9c8b59d54e2fa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DGA062483516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0321f0f51f5529f9c2bd21b35d0b4a71d3c9739a447b724b74ae6ee2678c552. 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/DGA062486846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5fdbbd0b5fcda56a3680076a9e07eede9fc816466f4e8ddf6a4fc9981cd605. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DGA0M2477210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215fc1cbc2cb944257dde923942fb2b70e726fccf9328e9a8ad13ebcfaf9630e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DGA0H2413240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda387fd634fc093e66895d8d0bdd85f38e2c8edc5bd4484ba61d9a6a52f95fe. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA0P2405200.