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 0x41e64ccb0f658867f8d9ebe74e61378dc5ab7958779ee3e5b5164ffa9c9a18fd. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/591f7c3e-2551-48d2-8b7c-bc6b0a7dd678.json and https://artists.proofprofile.net/proofs/artist/591f7c3e-2551-48d2-8b7c-bc6b0a7dd678.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 0x145af532779a6fc5ccfd53b50f4bf1ef64f06fa1953e7d5f457ad9fd172c2e48. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USMAC0100402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab4060f5103add7c0af4aad0bba387e8ae2d863e16496dc5fdca9db35da1c7e. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:47:42Z), 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/USMAC0100403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e1c42af324ea5510db94073b6ca7c00572a4a770d597ebb8d0c6050b634473. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USMAC0100408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcc2784e88ea72226fff1197ccfa25d29bdaca24531a08e85c7fddfdbbee43d. 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/QM9A81604372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1d9a9ac46e7c3263532e055d2896daeb32e33062ec2f3547db4f94b132b3ab. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QM9A81604377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96cb850c0844b853cf78e3b05435f3bd386747fdfbb2971a93d33d7fa2d3ed0e. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCAFE2020027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5db8a3dec59de450ef664451914ffec314d115f479d5d6d9831db7e0e91cd92. 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/TCAFE2020095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c48c2f7acef280539f0c08068593667a2359db020fd4e3c94f76fffc6dd5fc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZ3GF1800020.