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 0xddd43240dc291197b993f4a96771f7c25bed8c178d3062b73d1125f31a6fe8e8. 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/cf941706-38b5-4fa8-9df8-37568923c7ac.json and https://artists.proofprofile.net/proofs/artist/cf941706-38b5-4fa8-9df8-37568923c7ac.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 0x4ce59d8dbf87e2aa0dd1109e5fb0e6c24f683277ee7ee89fd11aba70469f4621. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLF242208807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba3bcf95f0299d37c85726b08b3e983af2533aa6bb6bc56c4ea1b3073df663e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/PLF242208818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16af07a62b75722bf707beff0719dc30f9b66c35bf8ae4722c89ef76650e07c5. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/PLF242209595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb86b81b7af1a3ce8a5d78e0220734a84b4a8268bce4b4182fa3a226c9b296a. 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/PLF242210085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607c20f07e846f46afb7b47817d28feac667ef2e34fa34f488a4db83bc643739. 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/PLF242210403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb451ef0308de9cd9b408e7d5ffa594647fc615250cfc1ab3d15419de57465824. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/PLF242210472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10d7d431d0a770c1ec38c6d7fa1918d549b7917708cc57b3dba883a5c05fd2d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PLC062403461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3e7d1f815fe1c3b075f9dd4d11a7776ed75dba007158a51b480a96916a2fa3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLC062410103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc679afdf1f4b4f72e524d38696e94d4697cf69dd95eb7baaae594b83cf1d9393. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/PLC062410104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10d7d431d0a770c1ec38c6d7fa1918d549b7917708cc57b3dba883a5c05fd2d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLC062403461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc97e138701f5a5e5e022a8251f5fb40cbc69157dc1c2b6eed8bbaf698d42a5. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/PLC062410105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1940bf656ca37c07c4022e46229a750deb2a3c5b0134b4a58400d813f91b2c96. 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/PLC062410106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023c678d84d7ec2b323f46ed4abeef6248e044ba7187c33cda18328e2c9e25c1. 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/PLC062410107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c4b4647a2eabfdae51f42f9628707500691aa15cb4ca85e9cba90e4690e20f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/PLC062420882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3fae57e2f8042ce266641e68c5337bef8dc8875f3610a6d71058a1304852e1. 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/PLC062533456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53832ba891c2ec7df6af323733c469dfee143dcd76d95eaeb2dd932655d67fb1. 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/PLC062376275.