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 0xab6b53175cb4f867d7c1e2213c6c92848910e4a6e54cff47c3dddade5a03d28b. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a000c116-9c36-4cc7-af02-256a1dc2b974.json and https://artists.proofprofile.net/proofs/artist/a000c116-9c36-4cc7-af02-256a1dc2b974.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 0x9135350ab8e6f8485bf3542e3924502385e43394e2b4c12824c8cc498b072a7b. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/DEZC62322353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7310281c2fed01294f152f31e041beaf50d3369d7db9ef2c19cc08b4e87dc40a. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/DEZC62208510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafb4e06fc734b29c9db95a913f78e0265307e2bc584c8e7d30160bc4b47f440. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/DEZC62266224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c8c8fceb5c43e1518701c70fa190bf88763c65a3f23cf1f1da9c571f818b0c. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/DEZC62137524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200462d19c890ec77b22f3e24e1261ddba9fd987415854ff83e87798cdb52cde. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/DEZC62400233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebfc712c4ca0753fe70e7e0cad7354b83609df6d93ba0995d024d4e53101be5. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEZC62573668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac339063505aad80c0552f30f9663fe4d39fe15c4f63e3a839ab50a8840ebef1. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DEZC62577495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebfc712c4ca0753fe70e7e0cad7354b83609df6d93ba0995d024d4e53101be5. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/DEZC62573668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1246ce19971ec055cf596ef829dba86fa7f5e414c9ed54d73aec624856f47d4. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DEZC62385511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bedb8a80bcedf7dbd71df05b1150a35a91493100cfa251e9273d3c12907ef7. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DEZC62374525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1194336d0d3dc5cabc80d9ecb95d40dd2403ff213ce176a3617d99b03691e3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEZC62584609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa47962037b303574a0ca6d701c007c11e688b3a2ecc9b7e9e2dbb9f105f67c4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEZC62584610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7334737be5799c8187162ecd7c838dc879ab2d33c7a0859c45c9996154c11b. 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/DEZC62584611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c2d82ca1fd98595aecd1e4699a0e68b5ed1d44573c1c8443cb313f11c34e0e. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/DEZC62584612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330dde65b6c06d04ed159cede903bc64ea302ef3e9c485aeb4dcbccf5c22cdeb. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEZC62584613.