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 0x3437eb0de73643683f0abbfe0de7c0fed1a2a44fc8d7eb27576cffccaf4af51c. 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/16cebfcd-eb53-49a0-99d5-9616cdb14918.json and https://artists.proofprofile.net/proofs/artist/16cebfcd-eb53-49a0-99d5-9616cdb14918.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 0x930b246aa38541f586c816dbfb0c16c5ec224eec1d469a50b9cc4a239aa50144. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T10:52:20Z), 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/QZNJY2303736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d431118863319ca020c53cc02ace8c7a094f89d419f3e66358b46acebb8b75. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZNJY2303729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7be729bd237292c9784e964f44affe8af86d6b17b6f5fdf20ccb01de50f4bf. 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/QM3DF2273089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc424b2ee2b1967ccc224bb200a17ff4d9ad40ec0ccd8e6f98678376c171abd19. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QM3DF2273090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ede163a2c96e75d648215359599e51928af82dab2e791bcd40209bda7b7958f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:53:29Z), 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/DEYX82207585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bc1af4b1e321a5aeedf7a9eb033550176f68fa06e1c7199fcf9d71016b01d1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:09:30Z), 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/DEYX82207589.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e044f59a5d96bde2a7fe9fad05b35793e0b706b7884f5c265cecf4931dd7fa9. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTPX2401859.