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 0xd165a3a320fd6ad857ba2d83ae58a47941b05e58753226f651bb737f443df83b. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48189ac9-89a9-4b1a-9e44-7fcc44b80208.json and https://artists.proofprofile.net/proofs/artist/48189ac9-89a9-4b1a-9e44-7fcc44b80208.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 0x2a8400dfd5c5f48abcd23fd5a9839c7c6bd7f3fd3172379ae67ffd64bd6e70d1. 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/PL6A22370700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666433ed08b07ca756e2357f88d2212ff40f4b818cd0824a72e7115c48da899e. 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/PL6A22370701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa403f97cbabf91ecfb092cfe1cea2009bf287da9c0f32ae27a1a5b0189f725d4. 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/PL6A22370702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe326831e3e81126fe16d577d1b9c05d3f4b757c7cdfe8562ad0c1ee8cbb6edda. 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/PL6A22370704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdddbb1da998cfec7e86050fe977821c1105876b6b02dfbe46f3d8ff135f92f2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/PL6A22370705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e9f8440f72ce2d1a09ee5ad519f6425229eba190a3be82973caba564b590db. 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/PL6A22370706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe592c191396b2b45f30a4527d9bd62dc6897cceba7f45736074e8866db06a372. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T18:00:10Z), 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/PL6A22370710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e343a9c5025b5246e5deee0ae7b32bab382b94e2d8dbc0b36a9e21e53a58f4. 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/PL6A22370714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636a259028e7e38df492f59c3f78ca8d74b881820014634b6954a99912406be1. 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/PL6A22370715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844b98dd614120846a349335f8e4bb8b44418cf7e53fda913b46d1907a36df47. 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/PL6A22370718.