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 0x432c4a93b0e4e735a8fd01d52228dec4f04892d3265c560b0c76ae8a62da592b. 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/b8af41cb-7422-46ff-bf21-83a05b380ec0.json and https://artists.proofprofile.net/proofs/artist/b8af41cb-7422-46ff-bf21-83a05b380ec0.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 0xeff633e22b1dc12a7d3efb9285621e1bbd8c2bcf7c3230c9cfda5522a2256699. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/GBX721900279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9b47d84d302da980d053238706a3716db2da91f80ecb926971a0769392153a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHZ31994344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885ccc4ed1c43eb0a56e1ddc5d7df66c089f1b661a7c94be173bcd55f968bc95. 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/USWB12004412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb47bf66c81544c9a54864d89249edc217d67ee2f76e1b159df4ec4e6ef55eb. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USWB12100843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202b24cdafa1a6ecd638550b2e71666ea567e086c40fafd9a76a994eeece5882. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USLZJ2310580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556e31587c6fd7b940cd5323ec0d7df1f117371b6d7d8b2053e793518c26adb7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/GBRKQ2381578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6bab91f692fd4be8ec715f2d7b0b873a71a6255ac16ffefaefdcccd919aecc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTV32385721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe812b0c37b4e3dd538e1c34d0d92ee5c1d78511fe34dc0de51fa18087ed55a9e. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCAGL2289571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6bab91f692fd4be8ec715f2d7b0b873a71a6255ac16ffefaefdcccd919aecc. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTV32385721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556e31587c6fd7b940cd5323ec0d7df1f117371b6d7d8b2053e793518c26adb7. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/GBRKQ2381578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe2a4059f0986c4c3cf70380ad2f3840b2b862dad4860ae27f6e3995c81097a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAGO2220788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d40ce445b0e7c0024ab6d39064e018b1c6b4a46cbc44036fccff96e65f22d5. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZZ8A2392847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc80dc56ffd4fa48b15897103e7ee269d3d55ea3f198d9029d2354eadc0dbb12. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZWV32472488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd274101c44deab6070fb6f7dce7661bcdcc79d795e1f43880273baafaef69367. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZZ8B2438648.