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 0x3442fdee7e255a20aefcf022aedf808830e2db6f3d493410696ba2aa99bb9459. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d5dc6b0-85c7-439d-b5d5-4a770e5f6583.json and https://artists.proofprofile.net/proofs/artist/2d5dc6b0-85c7-439d-b5d5-4a770e5f6583.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 0x94acad0eb0fb02a53a2a67691d0fe980f5085071fb9c9905922c848237bd98cf. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/TWCC32302729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522c1f57c65441d177e9055f13cb497b9f358294dda6d6d0efd4bb1894f3cee3. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/TWCC32212588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fd6c3b4526375d9412ed9ffc21be9429b7db40f9a573b320bb860c4533daf7. 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/TWCC32302730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b093bb68c0e119d73fcdfeb63e8d48049da8cc4742377f4dba0139a062c56a. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/TWCC32302734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5b70f317b1f4c454af0cef707ec1a2a817d5574de5a5ddc62bce91d73737d3. 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/TWCC32302731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f92c4c8618eaa84e274ef6ddf5d9f53c75351b627b6637d9970ab2cab54fa83. 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/TWCC32301952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e743561859470a7461d358da92f9e9fed466276b4d33a608fbe649062e9bfc7. 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/TWCC32302732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8bf8b1623ed37c38760af9b13fb85d8ae23d34b0ef540ffab30535eaee6e79. 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/TWCC32301280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeabee57077f8a1c86de97dec9b05c1bba393a931fda88253cfeac4328f50680. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/TWCC32302733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c0d7ed132b3a6f39e970e41c921340ee2052c8a9d0864b7ededd554f02de90. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TWCC32302475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8bf8b1623ed37c38760af9b13fb85d8ae23d34b0ef540ffab30535eaee6e79. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TWCC32301280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ae573dc07440980f775564a2002a883b82fc5980ea8039742362d62a79286f. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/TWCC32421427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1207c0022b0782e2f0a90cf1d4d9358d72c1a319fe9c41b073fa08b06507fc. 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/TWCC32421428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65ef56e465b87057342723e2364c6c3be8e296f2add2aca65d8759a094887e2. 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/TWCC32421429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e992ac0bd6b44b4700b2659602d602c3cd448fc55084a389d208e20a434b42e. 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/TWCC32202212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd678ba624188c587836e121b84657864498f3d381556785306d46d297b875e58. 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/TWCC32421430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e992ac0bd6b44b4700b2659602d602c3cd448fc55084a389d208e20a434b42e. 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/TWCC32202212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b55c2b0b9a1711da8b202e9fc8c5e803df7575b18537373aa996ce7af3676c. 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/DGA0H2308611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8404076c095d092cf6cd81378e9263258b5d6b2a88a097394e6e8920921139. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DGA0H2308612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109722a1444db5a217b7420f081c90f5eeb1781cd198a20578b6a2709a6d5998. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DGA0H2308613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c70c684c194fe2bfacef453545add68de0a56d0ce4f081b4330d38b1340c9f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DGA0H2308614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cb1d23a37fa4ad8514d83b0f779bd50f7ecce72d2ebf2925a44d38cae12d7c. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/DGA0H2308615.