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 0x6de2b86bb8edc3baf479d53b4de024a8a7934a18402538210fefa72bbb9fa681. 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/33d988a5-a346-487e-9968-a52cb2d2860d.json and https://artists.proofprofile.net/proofs/artist/33d988a5-a346-487e-9968-a52cb2d2860d.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 0x672e93e1674834e069a226f9fd4a0281c374bc557d2bed54519d6b87780910a0. 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/NL4NL2142205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde371b39cd91c221acb09a4d7c026856805ee8f36b650b5c67aa1ba1cbeb7176. 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/NL4NL2164062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd746849a49cd464822bd9c994bdc1a19f41ead818bf5e2688c819daf83161cc3. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NL4NL2219389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85406e648cba142bfb1c69f665fcd6f538c97a074412cb018f5b339202d48cdb. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NL4NL2219392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6634f019db93906780bf69c27eaf14c429efca3e1683a5056e8c8d7b8388c319. 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/NL4NL2209264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c80675bb92f61e82e9fdc64a33927c9b6635427219b0cacddc12df103983bc. 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/NL4NL2213133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ddcd0cda9638b238ccd858f3938d4ccfdff375600feaae1c2de5c878a992b3f. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:48:37Z), 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/NL4NL2165365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee0c8fa362362099fb4b047ceaf728c4c91bd1a6dbab4da8db21b66e9ad65b1. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TCAGH2215517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2048fdbf93c0c4ca2893c40892bc2790e5e717bdc62e3c4bf89b99f1f2974cb6. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/TCAGM2227262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80fb0d656cb947c2bbadc8cee303a938086beeda4759661a756be435562f7ed. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:44:34Z), 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/TCAGU2371100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469fe7f71b0af7032eb1499da48df527f8f4b3c60fb2c4ab93589f8b1f69f337. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/TCAHB2333642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccc177561492802e0f5e62ac6ebbad9ece3630ef0a85a415a85557a3293f0eb. 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/TCAHN2315284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c57afb098e54ffc1e64860be3f2e60ea8eed5aea1781c0dab1e40a2434d264c. 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/TCAHN2315295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b814f3bd4c1e9495abd7b3b60453a34244e6d3b7e9c4af197219205ac061bb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAHN2315301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4315577df456a804362521ab21e06606e6a0e80ff49a6a51f31f6ab38e2d01. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAHN2315312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911cd91f5bf647a5a631a031d35c9ed822aa15436616af3739aa077fe3caa2bd. 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/DEZC62585384.