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 0x4bc94b0d0fee90f57ac7d6b1369513d1a51d833297d276f466652b6a76e6ea3c. 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/6da023d5-5ab6-4f87-a5a0-85e90962920e.json and https://artists.proofprofile.net/proofs/artist/6da023d5-5ab6-4f87-a5a0-85e90962920e.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 0xd0ffe411add4276f951325db5e86a7068a908860897040d52e0627ef21865d3e. 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/FRR642101079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbe58295c2d5c219ca61851390836a7d2289d884c6e84ef0ba1dc75244c1da0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR2X41934578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e9b13fe728de1b2ec70c8b42fce75069d56855f5b5e8e6d7d55547818a7a907. 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/FRX762412743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd681a16d8dc07581acbe07ea8aff7e4687c98ed9f14a982701364d49ab74575. 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/FRX762412745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3179eb2eba6e607d04d94f7545b35a30cd47fff36f0a664bb8cf407e92c204. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FRX762412746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ba40be981fa1bb2478f1d0bbb94bfaf201e1729eb7f83862fb66399d36afce. 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/FRX762412747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50702d7834f8f259f0a0e9720d649bf1ecee7dc3e27014d0c6da558fc6c17de9. 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/FRX762412749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17591f1163f50ddcdc035a66a7d1bc4f9b20d6f1c6341e08f51463badc7c6ce3. 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/FRX762412750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b727a589718946ade8e8247e0d42332e096cd5d6c024723df4ab00509d0d4d5. 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/FRX762412753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0ff23edfcc2ddf8f893acf243bb6461c0e788edc7c79376a460abb146c4dd2. 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/FR9W12129043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd60ddfba2b184951b6757a1057803fb0aad5ed33e96da560ab43c7dd1531e0. 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/FR9W12129046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6498edf8e46676bbaf3e72bc5bbc98a94e2fa74a361db52dd2ac6711b4dee3d5. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/FR9W12243537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98379e96ce84c3bd773f2eb21c4de70c85e6830301fd3fa87864dca086034ce. 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/FRX282336494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ba40be981fa1bb2478f1d0bbb94bfaf201e1729eb7f83862fb66399d36afce. 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/FRX762412747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2274fbf34205daf09ce87409a709b30fd4d9235fcf32aa454e1c89e12e1166fd. 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/FR1Z42020351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd24af7187c54c76f11b9132a79a3fce1227a62e3991aab3bbe7b5871881f5f8. 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/FRR642001684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6498edf8e46676bbaf3e72bc5bbc98a94e2fa74a361db52dd2ac6711b4dee3d5. 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/FR9W12243537.