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 0x05652f412c6526ab2e62c4f6369939141ec7912a7678c8754f5ce36467c32cf9. 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/cd22a5c8-eb30-48d7-b783-80d4df8a2402.json and https://artists.proofprofile.net/proofs/artist/cd22a5c8-eb30-48d7-b783-80d4df8a2402.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 0xb02f969ff80e3ec82572c213bc790d3f9d3ad15c72355598640bcc4b349a7b53. 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/FR0Z51000451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31741a7daa2f0ba6fb20abe0cf99e00a38eabed9edae82c5e484d8ed250750c4. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:45:00Z), 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/FR0Z51000458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ee7d81a9ec1f35d02afd247eb207b70e37d566ad424ad21e920d9c342d7cdc. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/FR6V82091382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5698c351fed7047dee52965f9514a666e3555b3b97ab89e846268d97d0d622. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR6V82091393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9216d957b06d163586783b73fde413e1488d380cb29ea1e5768c670640ecdb2. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/FR5DL1400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75cb7c1352369d4a62fa4f8805f1be4b0c6aa71a2cf83be7c9bd6a75cd466b3. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/FR4HD1400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8402d7939ad2881d07ccfa7afb69726dc45eb70aff6ae936d68efa137c199795. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR4HD1400601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b97f5c6b8e24e40417a9cc8a43cdb5f0c8f5351f7032245c45c37ce61f7923. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T18:53:49Z), 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/FR26V1529536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfa4c8d5946080f80f89187a6f61b9f1afbe69a1e4b5af3793146789fd27ca0. 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/FR26V1529537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7622ac6ad8a094294b995fd4fab3627ac0aeb33dde9bc35a109ada49f7540db3. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/FR26V1646881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89df44387bcbdcd1d2ecbbde482df6e416e6b2fdfa9dc465cc2082d90912b993. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/TCACY1737362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93c6db2db707f03db66a79028d88cfab23ef2446614fb6823597331a09e5722. 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/TCADG1791106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd171b4c3b28cd62d7f3b1501121f6134c4f4cf0d5e859a70cff7cb20648fd53f. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/FR5KU1900650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb62acf59e3f2b6749768b1e2dec316e706a8645a7d3df8ced02d057a2b2bf1. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:31:46Z), 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/TCADS1839740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8688eb49c30cebd9373bc9db726c1daca9ba5b742d48cf3004c7c0cc7287aa6c. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/TCAFU2124860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e605e03ed115f80b5ecb4d7ccc46bfcf02d88f313ec344eb0d8ed5af8be7a3. 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/TCAHF2348702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9932905e8c50c6c365ddd6932b9cadbc3cd41bf123773539e018d9cabd167dd3. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/TCAHF2348729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2dcaf35691cef76f5b00452612265e4b242277f27de10f5da6d1896e79c2e4. 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/TCAHF2348831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d91738c299714097905a352ed83d74b677d6a46a967f5cb39697b7e8c5cd7f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P2412866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d91738c299714097905a352ed83d74b677d6a46a967f5cb39697b7e8c5cd7f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2412866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423efcd655fbbb69d3cf7c0e6922eb41f1d41d3d23009b1bf2d4c1ec6c8fa730. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX202333899.