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 0x686daf13e8ff7a12289720ccb262fa2277b42918e8ce2c8f0c46acc55613c1bf. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/975eb4f6-57f7-44c4-ad75-014d665fe48e.json and https://artists.proofprofile.net/proofs/artist/975eb4f6-57f7-44c4-ad75-014d665fe48e.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 0x6c93405cfef7dd8a72602a665e6369c562c145d0c54ecb9d4b0a91ea81189e41. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:24:13Z), 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/USX9P1260856.
Don't Lose Your Smile (It's Christmas Time)
In the Footsteps of Marco Polo (Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed41a9826b6e766360ba6d3f60f2524b25826155c6231385c8bac783e0a2a0ea. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USHM82365642.
Exploring the Qingshui river (Main theme)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7911c179f26e04f126816da8240ca31df6193d3510673229bed9a7dd2d8ac57c. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/CACWV2588527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e1eef729657c92ef30320722a204a0548110add391f7c464ad85b450f0afe8. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:47:40Z), 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/CAENV2549915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf1f96af0a0e05d8c67087637adbf91f88fdb02ef996d9ff6729de493045e37. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CH6542560682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7911c179f26e04f126816da8240ca31df6193d3510673229bed9a7dd2d8ac57c. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/CACWV2588527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c42baaaa86897b1d8635213e4bf5a0239d11e53d40fef36b3809de0d1a79001. 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/CAGOO2554829.