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 0x94baa01a463632f3e8a225ee97591fd6bcaa33ade70438aff5b0023a4a6e8a5e. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cffab87f-2fc2-4f2e-a7bc-215cf240b912.json and https://artists.proofprofile.net/proofs/artist/cffab87f-2fc2-4f2e-a7bc-215cf240b912.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 0xcde5d5834b33831946b8d2bec619020c6920744e1505a39097581d2b37552bdd. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/IDA130916001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310d426075e02371759158742478116e3a093ffd1d1281a3c3ecce070596f470. 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/IDA130916002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3cea066bfce681c699636c1d608b88ab08d99f1a3de80e857b7dc671a94c22. 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/IDA130916003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20bff7001b9902ac9a781a4ab47aa0dfee5f617440dffb2bb4927f6c28f28f0d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:31:32Z), 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/IDA130916004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a411f2075d062b8dba68b413cbfea4b03ec0c525b21afbdb327a196edeb22b1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/IDA130916005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12745e910c0968635bd86a78092104c2036245f809682152289a9695bca166c9. 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/IDA130916008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fede7be413c0f1a952c5b8c7d22aeef7e02995f27f05680487bb9e8c2d043c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/IDA130916009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e99f33d1cfdd4c86be7c41a605ac8a8c99025f1712e6e759e90262c4ddabb2. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/IDA130916010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701632558c1713038f4c096fb8bfe4f9516dd6e87cebb2faae86e82d0decadc8. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:52:39Z), 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/IDA130916012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41b5ba0b7d6a1e2f83cada742998c2dc8e0b44ee4d07f3fec29f1a7d97c18be. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T23:00:51Z), 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/IDA130917401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69e0e38df7745026eb6d9560bd0e6ced743b2a814374ee8addd29dbaa3059b8. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/IDA130917402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1142ae2deb581ba230ed3d990af34b8fa361f2237d07bbff1ef825c0a2f99ec. 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/IDA130917403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1eeae7f4da3cccef834a30fd643520bf8788f335e8e8c9f80f96ee05fa3fb6. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:59:27Z), 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/IDA130917404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc26e5e5235879e7c0b5ef5169e9ae6dd07d44d0685d5309557f19d517992757. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/IDA130917407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02da4ae779d537c42994d6716a8bd838bf7d476e966d09121329f08fb1a6736. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T18:55:50Z), 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/IDA130917410.