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 0x66ed0cc108ec5fafb80f07b03fb91839b7124477c805658ff47f9505c6def358. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7d0fa73-ff2c-46d8-a1c7-ca3b34ffe45c.json and https://artists.proofprofile.net/proofs/artist/c7d0fa73-ff2c-46d8-a1c7-ca3b34ffe45c.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 0xb3a66806e46ac7809dc1981c9648cdc100f8875fbac253d3a39789206ac5ce53. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6Q2222898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a998ac462d06fee55432f06d0761f9b6e6d8885b284c9e246ab003c1819fa80. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZK6K2298385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4a446dc65690a1548195f82bb1c0ad128993b443c615a7003cc7756dbee0b1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMEP2219863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59b1978a93ae91fd180466d27deb1d5914d5f5e987c0027c51b725f4830cbd0. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNWR2278223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c07dcdb6d4c42ffd51bc77b6dea562b48babda22ee629f037d169d94cf00362. 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/QZDA42393450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d918049e4230c1b9356c626814d64ee29edd6d366205a061489663e8c21a9b. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZDA42303545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb705ec1c2ca9dacb2b6168e142c3ee07596a7a8b32ddd0f25c30a8e40c939883. 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/QZWFP2326382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15183cb3b75e9f388aca1ebb6fceefd662a615a36106b88e7777d19de090d98. 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/QZWFP2326383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffa728ba26ccc7d748962099ad885c80f1775ac574094032f2374f311177c62. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWW2475204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa224c41cee1a54d8e163e0b2615cd6e5059d3392005f6ce27c0480987c609c9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7T2404591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe855944fe4ed5fd7117646480a5da8cd0782c755138543511aec7f0b89ba5682. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QT3EZ2478165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc760eb4f6f9ae2dfd218c0c89087adf62cf8563d632150d885669d3d53654e71. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3EZ2478166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490bcf6641c4dc029f427352db8dc12b46813efd8f27bbdeae0c5cc54d9f7fa4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ7R2550026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d24290f4f6b8186678a147d2809cf2eb0c6a18314c1349c9a3db3594fa4e078. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZZ7V2566518.