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 0x81ca7987007a78d9dfcb0a2c7f3db22501490c8c176f91579cb052f1d6468c02. 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/c4402781-2d0d-4d41-812b-fd44dcbfb0de.json and https://artists.proofprofile.net/proofs/artist/c4402781-2d0d-4d41-812b-fd44dcbfb0de.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 0x623018e5978ae727477ad8594d50afb29db9ab561fe1cf9fdbc700f0f3b7004b. 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/QMFME2584085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3dafb4e7af3652ea5746ad25dd221c49218c478e55d893817a61a1f074a911. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZNWT2302418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfce8fc86b9ed61dde40278eaddd8a9ced0d5f829afa95a71734c37fd5d2948. 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/QZTAX2247645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770a68b438ebbcfde2e62b321c5691d488523a113f473cdc34178dbea2a19ea7. 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/QZHNB2402463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa241b480e66bc533e58be171e21b7167d229e1219f7f30985d07ed7491db5175. 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/QZHN72424404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6131ff59adc5214f081e4ef937c51f4f0e9183e332b12ec1c9bd3b11611ac0. 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/QZHN42433504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b505ae0b35f08d13c4b14763900e011ad076ba7ca55666e3546104755bce2c. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZFYZ2197816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d88545481c2a0de8da3559156316a65dae2f409ca8e14ab8a3d63eb49fac8e6. 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/QZFZ22198080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e37d06767619c3f24fec7f712c946875b31dce7c9f909772987c8f9dbafac6. 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/QZFZ62164355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913f1f22aa2e9feadd5c3b9b3e2ea8c50ca1571aa366dd767f640c12c307c8a2. 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/QZES92195425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c853d72f418c97f3bc5b4e465d4b7c2d82478e60020fd38f602442d73aaa0e. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZHN52112197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2a351c816f06ce92d6099ca6847553797099d5505273aca690924a469ae11b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN52111307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2a351c816f06ce92d6099ca6847553797099d5505273aca690924a469ae11b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHN52111307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e37d06767619c3f24fec7f712c946875b31dce7c9f909772987c8f9dbafac6. 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/QZFZ62164355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b505ae0b35f08d13c4b14763900e011ad076ba7ca55666e3546104755bce2c. 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/QZFYZ2197816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c49cef568e9508f4b681c5d86f6b73fd16b9c63e88f24e6554b82816a8ff87c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/INO131605788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12bef1147e4ddc35e4765f9d221631addeeb03b7c1d85b42b55a49224dd89e19. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/INO131605789.