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 0x49c8bbf62f0ab797cc0abe09682fc09c1fe3f17290c5a6c6fccd64afc9461dd3. 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/49d3e8f0-b783-4547-8ee6-0765ac9028ec.json and https://artists.proofprofile.net/proofs/artist/49d3e8f0-b783-4547-8ee6-0765ac9028ec.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 0x37f3cb8a72a3b2a18fc2c96f7b20f113b412181c723b9f01953d8ac65c77b598. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/GMBA21462371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbbbf310c2ad4f23ae7686eea71b769526ab6d49ad99d504be13c0c118f2510. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/GBLFP1515456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe022c7fec94a0d2a820670ad0a618a6b6694a8ebbf67c22e994655cac7d71876. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/GBUM71506940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3596fa20f51b54810873f0b3903b6aa695c563417c5bdaf205c2bcdbbea527. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GBUM71704694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677fafb92efc948ae275475a6c0014cddfb4a289982d4129a9c88c23b07d0fb0. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GBUM71801371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88161353cad47503b7e506c3e1b5e4d2e3aeecc2a0ccf6ab8c2481d8540925b4. 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/GBUM71805885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b719e65fea71581d4de3cbcb45c98368377cd47bea7b5300784db95bb432bd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBUM71705672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45859a0ea8f2c104f694037295332a06b1fd0f7fe4501e5cb927e4c37095734b. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/GBUM71704901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6355475c9231fa17ad6fee472ffdde9875e028103f2f9cf6944bc71989821dcd. 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/GBUM71705615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a160e588f3008d957aac78e2c8ad82293e16a649661ef78bf91e02cbfe2b412. 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/GBUM71801418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49a5a6007375fbf0ee6c8f0712c6eabaedc07cd5a3b500c152ee8edd2f4dd04. 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/GBUM71806223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78413df9055c877d263b1c5745b62e0be9ea5fdf64583f22527021442d01ec65. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/GBUM71705621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6341fdbc6e2744568eb77cdbc47e3a14a44b2fb3f6d8b204554aea984d15a779. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/GX53U2052779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d45ec268ee2ee339b571fc8330300dfc17ab71482dd9be49f20394164a726ba. 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/TCAGI2273566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14071efc5eb10676c11afc10baea86771cf93a38f24977075c3046139d0f3936. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/TCAHT2322784.