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 0x824c3fe77010adb0d933c673b8045cb1000934bd820062f59f9fcfa64b6a2c02. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e99adb0-20bf-45f6-862d-fe00f8f62561.json and https://artists.proofprofile.net/proofs/artist/4e99adb0-20bf-45f6-862d-fe00f8f62561.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 0x90dc5fab5520a1af84a9a6bf5a49f376f5bf7f486f95b1638dd6a5c4cfea2af5. 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/TR1751400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3fabd61370e617cfdb4228f5ed995eec31334613450ebb847329da38284ca3. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TR0720700017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739e016b51cb2c64d141aac3e1d4dbb97e939545bbfa16089dd224be72232b62. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TR7204000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916d837047e89c83365012e65bc8357e700207fd91e53050f0f8545bfa4fe1ce. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TR2061200769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f56ce1028b25aa69af5d7f7f1061a868594b17300acb5ff4bdb61b27c16a80. 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/TR2061200765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5781b933c0044021f8735b64e8572acafdc8b726c2692248190ea086db4a66b2. 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/TR1751900129.
Türk Halk Müziği Karışık Seçme Türküler, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8755fef7f861df4d5d9e999647a3c48cf19229172bcf929a97506da2742b398. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR2X41921740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb07c56b5ceff817368af509479f1b5ddaf87c2a0fb9af679e3a2953496e7926. 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/FR2X41921741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa841f6d4b372ad890891baf300459cd83c75f62f91d5c32cbeeb659c3a6aa0c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR2X41921742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c185dbf58a2c7faaac5b5a0573eead72b062d269fc0acc5ee361d2849c87b70. Chain 2 (Bitcoin): anchored in block 957240 (2026-07-09T00:47:38Z), 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/TR1751300328.
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