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 0xf799dce792e9d78c78323142238d49de965d3bc76ac807602ca7614f207415f3. 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/663df1f2-a46a-40d7-96d3-342979c2e93f.json and https://artists.proofprofile.net/proofs/artist/663df1f2-a46a-40d7-96d3-342979c2e93f.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 0xb233f371abf7d71fd12fdce8c02725e8bba8dbac3464a69eb723508c16d7adfb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA51989883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f1b07edff0d4f064199c9fa69bac00b63e377d2735061c22f0bddc43ffaff3. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZDA51990391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9f7261ca31abaf353e8edeb13742d4c0f6addd2e4b7e4deb2213fecac14903. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA81940074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6091069ef897a19eda821e9a3592fd6170b8c2dd1abbcc12d4bfdd472e3485. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZES72050673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d708f6948efbb48d06341f818d91f435afe8d6cbd76d2b686f249a52390a75. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZES72050676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cd837bf9d2eda9ff449c1edd9b02063f73f839acace1e82fa5d9301ecfc8bb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNWX2095146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb386549ff018f65a8632bbb06b4f8734a3bdce256c1de5505818e55d4ce383a4. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:20:34Z), 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/QZ5AB2405417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88dd25c7802aca5ced36707d2e6e01e29ef92c7e78686b6e2762d6288de331e. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZ5AB2405418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cf5e66e3b5b663afebb37e902776142ba3950b692daf5e1b656ee35b123c7f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZ5AB2405412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8523548e2a35e392310001bbfea24b9a463758db2094935a701a924df783fb. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:36:19Z), 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/QZNJW2454268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfa97d5a75cea5da0470f723ec9915df7540ca3a483d4876a188548048d7448. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:37:23Z), 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/QZW9K2428080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76aa24ef2882d31474e5fee96236eebba04b91f7a162ff006621f34c11642dd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZW9K2493340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8800b382ae3526d4ed4d0fa19bed243ec0307f24cf1a7aa750775b9b370ee8e0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNJV2515935.