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 0x0ea74921ceaf94f8f3c25793c16250e79db97c7bc265427b72e398e186bb20fe. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8372b3e6-449a-4135-b5fe-ae96d7cccdc8.json and https://artists.proofprofile.net/proofs/artist/8372b3e6-449a-4135-b5fe-ae96d7cccdc8.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 0xeed95d88a97159821e046a40cd669aa08b755651a5323d6fddac1b57ecd1deb1. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/FRX202354180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d303de51c2c08bdc63a56641d61719fdb82c67922c038f28e370e6d298bce5. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRX202354181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0eaf7bdfc3dcdba22c9353a8215775fea8886701e19460afba72a166583366. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FRX202354182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b29262b9a9000080ff9ceb8f776a630955e49ba07d4e7a69e639bfa003279d. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/FRX202354183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cd688d5e110b4f830e702e4b905d94ae55a0abc061db8d763e78afb2961290. 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/FRX202354184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278a7ca18fb5a5b80097010ac227afe01f9f9896704fc93e74181d220f46b5cd. 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/FRX202354185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb372e0dd71427a1f224d39d733101c32711eda3701318a13fa4cdc56ce96233. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/FRX202354187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc85000953332feed7071dc466693930f8b65b477703e09e7cb702a10e6686b. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/FRX202354188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278a7ca18fb5a5b80097010ac227afe01f9f9896704fc93e74181d220f46b5cd. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/FRX202354185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed95d88a97159821e046a40cd669aa08b755651a5323d6fddac1b57ecd1deb1. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/FRX202354180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908de1c98204e2e569d1021794e001fc2fa18abbe5e29bd7dab74ede10d2e0c4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USA2P1962920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a566967d633e6b754c3d884d50790a9ba00c3ee04105712ca14319dcb575e1d. 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/USA2P2011365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0da5a23067131ee2a86ea956a7019527b0f2d9245b0c54d00539cc7215c0b7. 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/QMKF61900205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3029d9385c14d5a78de621483e046295bb3f9f251b97bd9327059fe3d8d600cc. 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/USA2P2011366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3509c0a4986d868da11d48209f1f9abaec1e92654ada506f864f38fe6e216410. 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/USA2P2011367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9062a6804ae1a2d85a1510baa90593475e31b0a4d55464cfc60a33adeba44e09. 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/TCADU1821844.