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 0x101a024287eba91a1340a3e01aa5e4ba9f71eddc6907ed52a57d337c2f40a8da. 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/d6e0328d-fc14-48c1-9bd1-0f8f20989c45.json and https://artists.proofprofile.net/proofs/artist/d6e0328d-fc14-48c1-9bd1-0f8f20989c45.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 0x45ec64a116a31325d7de40c0e2ac6b4b1028f54f513cfe392e7961bf350db385. 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/FRX762424827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84266713c1716e68fc42bd560401806df3833dc4ae9bc1bf7019eb4e56a66dc. 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/FRX762402609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad1404968163113aff50b8f9ae242b36daf3273b9df52739c963766f45046af. 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/FRX282402321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72ce3e482732b9f6f532063f9d074ca44ca8d777f091ae912712cc27b9cca82. 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/FRX202445333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682c2cc136dec44dc5aa5f5c170aea5bdfc4f99217c3d53a75ce55fd41f2560d. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/DGA0R2314624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afd02fb1a50f78b4ec01cbe44db8142916f4695f30c2e727e7e527c9d4062b4. 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/HKC992325361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf71597e3d3b5bb4a2e77128425cb6ac973c40dad2e6c0d0a589c847a3a3af1. 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/HKC992325089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9910a141c65d73764cd114b4149a8f91caeedb87b3223b937d8aff85fdec0901. 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/HKC992324786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0358b399e5a6f4187acfe50bf50713db4a457f9043f316bbb07efac184368ab. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKC992324811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0757902c976aec2c65b0733162b86559b4ba6323aed9fcdac9cfcc39865fcc. 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/HKC992324925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57191bc59e0c5f729c9c92b73b8d6a7e50be7abe7c3667aaff322185fd30e212. 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/HKC992324730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74caa9d81ad02e424217d64d502ef3adbd378b7c2dd63e7d16a20bd4d9c99941. 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/HKC992324577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda876ef394d8cd92236e21837ec037660bfb3992118d83772f394cfe25b8614f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:59:01Z), 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/HKC992324741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d34517e04deac9c978404baf42ccd109a69885d305420753e6bc7c971661b9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKC992324496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d6a7bc06b99ebee450d37059127d29e2392a4a8c53017db5d445b6a88c122c. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/DGA072458127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6459123cc3ef9891a2d6312ebc0ad357816769cee584c553aac41c6ca9035e05. 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/DGA062405539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e43e5692e1ff4020e0df96c858b020109049139948a0da4c1d770c6975c528d. 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/DGA052495540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e6a938778916d0e72061adfe91e53a714dd15544a0d904b8b9472b97cefc6a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DGA072424992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b0352f9f20910952eaee9228349fe2afb0e59d972ea3b6d259a8b80793cacc. 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/TWDL72400467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf0fe2165e0ed2116b66e87d8929f9b92a3b57c5d952a61e625a641e6245c16. 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/HKC992325641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2446917c9fe1882b1d45ae12cf0a561a1be65d605a2bd5e9d2567cf69fe7b9. 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/HKC992324997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb869a496264f07411ab1c7f9766f34a8823cf28a6ecd6c00c41ca8d6130dc92d. 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/HKC992324926.