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 0x0144d1885949dd06b520ee2a936ea284329887c32e1f0534bbf95e2ca2c0b3e4. 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/e2d71970-af6c-4263-bfe7-332004a979d9.json and https://artists.proofprofile.net/proofs/artist/e2d71970-af6c-4263-bfe7-332004a979d9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x4ea035d1e1202d68da722342b23fbe97ac431a9b8764b3ea296f7baa50c4764c. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZDA82564146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb345fe1a8f7a7efe523f369e82ea596453c45926b04f24071a964062d6d8c9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA82564147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f833f8c8f4324d631fb7ae7d8d044f8efc822652f1768c10c9790c3f416701a. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZDA82564148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd530a600f3ac5d539050cf17c358b799512dcfc5c9b6e442f4e3b4454d20d0. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZDA82564149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02243b49486511b2e8fcfbb0e89f5f141d42a8fc5d947ace683c4812f15775e1. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZDA82564150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f0e0508bcf23c00930a892fc836dc0242188fc771c507047758de22d847802. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZDA82564151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dc43ab2eaa436040793b5b6a71c9360a5b7ea59eb26a48f36abb01444859fc. 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/QZDA82564152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b13d1cbbcc5734be12179d37cd556ec9748640b315f07221e8fc9c4efd063d0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:11:46Z), 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/QZDA82564153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b6557771cecddeeb9f7e838807d58bdf87948ec404773d1c60d84ee23f6e48. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZDA82564154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e98a166dd3e78e1a1fad91b9b713849781b216d66c4087792c797fd4d2597f3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T06:52:57Z), 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/QZDA82564155.