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 0xfeae620edff48ef1afc04497d345ddf80a7513314f324059dc8911fb337fea86. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd09902f-9b14-4290-8b74-02df5321ead0.json and https://artists.proofprofile.net/proofs/artist/fd09902f-9b14-4290-8b74-02df5321ead0.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 0x6eae86117738efdf294991c0045e4b92eba8fad4af75482b49f2d2dbd5b63c39. 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/UKXN22564543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99bdbfcee8dd790249617f0664f77a3670cd3a7bc5f47433963dbbeb59b3d5d3. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/UKXN22564544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717479d211f02c6d24ad9c651facd653507dc7d7447a424f31ce9a3bfcbb1533. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/UKXN22564545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf87912397924108b2cb4f3908a48e6c63a6e362f70c60827504c4d5f849018. 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/UKXN22564546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3172aff97511ec306897b5da88ac62f8f5d147ff291fe3484323ac182a3218. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/UKXN22564549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a2b18c43ea2041d1ac961895c5e4775da5d16240b63066102018d55529be0b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/UKXN22564553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df07806a6b624be78cb4e94effb7c874ff4f10aaa00fda54ed552c91f8ea86b. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/UKXN22564555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18c2d9d596647caff42445d43a96e9a804b47b4e34ba21c0b44d944972e59f6. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/GX53U2562646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5248ee82e060ab39f7fe2276b1d49742adeb050d60e443bdb2f2db7757ec76b8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GX53U2562647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f309f2edfd28c3bc367865bb83ec77da420e2caba5d9a406af2c076ddde3ae. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/GX53U2562648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef1c252700ca7041a86364d9d83ea3b2609794b2764a2d31857ca39dfb98eed. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GX53U2562650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b3e8faace609fecd6549b68ec6f3add9e8ab9bd2ed6787dde30c43f6fcef41. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/GX53U2562651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361a207f64fc5eb22c8ba6163a57523e31ff72eecc1637990a70643bf56fb44f. 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/GX53U2562653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ff43616bec30ddcde721945a297cbdd9d8897af03833e06db4b0fd3e91658d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GX53U2562654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59083ed518b375c4ec4486cfde9c908c55c928fbca54ff59ddcdb6fe83ae92b2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GXHUT2551361.