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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf91ac1c49c01cea6fae84a20c37c79226c8c8fc4dddf542f28559ace05112fd. 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/9f529c9a-0183-43e2-a931-175c31e5e1a0.json and https://artists.proofprofile.net/proofs/artist/9f529c9a-0183-43e2-a931-175c31e5e1a0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34a05c6ab7005baa0610e9622ce1efe7a252d5925010700c17ee8e5b3d479af. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USL4R2097825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f6d3c31a0871cbbf993e8182d4486c011e2caccdd1ef1be0b03e31dae00315. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:50:30Z), 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/USL4R2097832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482fed28602806d8db2bd5f52ac600f57f0c080894256f66ca34e12ea11d4a32. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USL4R2097836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b0b508bc595cc3481e84ffdec201d04457165d1feaf2bd608224be78ae2d3c. 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/USL4R2097838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e830247cc453ec40963d60c2ce44704e4a4da64513a9c7e76d7998a3941e27. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:02:20Z), 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/USHM82281869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8c3e682dbd91545b0355cbbb41c089196a8aab7220234531c8ff4282cac29e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T04:48:23Z), 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/QZTB42365589.