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 0xf4cc07ee1702474fac5b5234c8b41f11366f435cdac8642ba3f1c3b0168ef22e. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ee38794-be38-4283-a3f9-2cbb6bfaba8f.json and https://artists.proofprofile.net/proofs/artist/6ee38794-be38-4283-a3f9-2cbb6bfaba8f.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 0x67c7dfec38924b8ae3d2cd7d56799e09da31d68fe222c57c76e996d1abb81bf4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZK6N2269319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34711f9b78cf32b6741fa53bdfbd6ba8bca874f9a2af2751fa27c3d1f344493. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWT2488122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df78c27335d1626cec602a31298866afa2875bd6343c119ef8227b00e25c78b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTB32422442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53301f1e9c051e41fb9cb9da0d068c9c26e139cb095c8ace5c167fa55ee55d95. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZES72560066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc86cd07d5592b245fc97341ef85f80909f7babdc533a2287263500e3508653. 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/QZES72560067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d34989b50c4348991d9a25439850bd7ebabf3c0372494ca1c7a0e4cf7b6cf16. 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/QZES72560068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53301f1e9c051e41fb9cb9da0d068c9c26e139cb095c8ace5c167fa55ee55d95. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES72560066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc86cd07d5592b245fc97341ef85f80909f7babdc533a2287263500e3508653. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZES72560067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d34989b50c4348991d9a25439850bd7ebabf3c0372494ca1c7a0e4cf7b6cf16. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZES72560068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf112e37ef215ebdacef6f0fcd0cd5f8ca587760701e5c00b35c3932ac16c10. 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/QZNWS2556242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde046fc6832451412f8eebafa1fd0d04311c78a31b5551dde1f88f5eaff510e. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNWS2556243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06dacfa9b4643c41aafa1de7813814a6f7f9e3a6cff42ba3135b8aa15e425689. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNWS2556244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e7fc84190a2ff8548d47a20ef46d812c1fb0b0f4ab4872d7538328408b7c47. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZNWS2556245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca190090804a9a9dc0052639341273059c48d5b90098297944fddfd0794945aa. 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/QZTB62523075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0b793bca740eca37c52c16543cc76b536699c31a9c441ea76dbc0be91c6fbc. 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/QZTBF2519065.